Firefox freezes several times a day

Support page says to just restart Firefox, which I've been doing via Force Quit since there's no other way. But this is happening every 1-2 hours, which is just unacceptable for prolonged work. It doesn't matter what site I'm on or what I'm doing when it happens. First multi-touch scrolling stops working, then I realize I can't click on anything, then I realize I can't change tabs. What causes this and is there a way to fix it? I love FF 4 otherwise so I don't want to go back.
EDIT: I submitted this right after FF had frozen and I restarted. Fifteen minutes later, it did it again.

I have used Firefox since it first came out, and always loved it. Firefox 4.0.1 is a different story. This must be one of the worst software upgrades across the board, of any software package I have ever used. I have stuck with it for a few weeks, and I have now finally given up.
Constant crashes, constant freezes, many plugins no longer work, my favorite among them, i.e PDF plugin to see PDF files inside the browser. AppTabs disappear over and over.
I have downgraded back to 3.6.17 and hope things will be better again.

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              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 1035 (IMAP) [0x7fff92a163b5]
                              10 -[IMAPConnectionPool _makeConnectionAvailable:] + 438 (IMAP) [0x7fff92a19442]
                                10 -[IMAPConnectionPool _newGatewayForConnection:mailboxName:] + 64 (IMAP) [0x7fff92a1925e]
                                  10 -[IMAPGateway initWithIMAPConnection:mailbox:pool:] + 564 (IMAP) [0x7fff92a1e7a2]
                                    10 +[_IMAPClientSimulatedSelectOperation newWithMailboxName:] + 89 (IMAP) [0x7fff92a1e4ad]
                                      10 -[__NSOperationInternal _waitUntilFinished:] + 93 (Foundation) [0x7fff8eae45a9]
                                        10 __psynch_cvwait + 10 (libsystem_kernel.dylib) [0x7fff863cd716]
                                         *10 psynch_cvcontinue + 0 (pthread) [0xffffff7f80c14940]
      Thread 0x1ea73e   DispatchQueue 1770       priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 1035 (IMAP) [0x7fff92a163b5]
                              10 -[IMAPConnectionPool _makeConnectionAvailable:] + 438 (IMAP) [0x7fff92a19442]
                                10 -[IMAPConnectionPool _newGatewayForConnection:mailboxName:] + 64 (IMAP) [0x7fff92a1925e]
                                  10 -[IMAPGateway initWithIMAPConnection:mailbox:pool:] + 564 (IMAP) [0x7fff92a1e7a2]
                                    10 +[_IMAPClientSimulatedSelectOperation newWithMailboxName:] + 89 (IMAP) [0x7fff92a1e4ad]
                                      10 -[__NSOperationInternal _waitUntilFinished:] + 93 (Foundation) [0x7fff8eae45a9]
                                        10 __psynch_cvwait + 10 (libsystem_kernel.dylib) [0x7fff863cd716]
                                         *10 psynch_cvcontinue + 0 (pthread) [0xffffff7f80c14940]
      Thread 0x1ea740   DispatchQueue 2185       priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 1035 (IMAP) [0x7fff92a163b5]
                              10 -[IMAPConnectionPool _makeConnectionAvailable:] + 438 (IMAP) [0x7fff92a19442]
                                10 -[IMAPConnectionPool _newGatewayForConnection:mailboxName:] + 64 (IMAP) [0x7fff92a1925e]
                                  10 -[IMAPGateway initWithIMAPConnection:mailbox:pool:] + 564 (IMAP) [0x7fff92a1e7a2]
                                    10 +[_IMAPClientSimulatedSelectOperation newWithMailboxName:] + 89 (IMAP) [0x7fff92a1e4ad]
                                      10 -[__NSOperationInternal _waitUntilFinished:] + 93 (Foundation) [0x7fff8eae45a9]
                                        10 __psynch_cvwait + 10 (libsystem_kernel.dylib) [0x7fff863cd716]
                                         *10 psynch_cvcontinue + 0 (pthread) [0xffffff7f80c14940]
      Thread 0x1df36b   DispatchQueue 2839       priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 75 (libdispatch.dylib) [0x7fff8e8d8fa3]
              10 _dispatch_queue_invoke + 110 (libdispatch.dylib) [0x7fff8e8da9dd]
                10 _dispatch_queue_drain + 451 (libdispatch.dylib) [0x7fff8e8d968f]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[_MCInvocationOperation main] + 332 (MailCore) [0x7fff88198f08]
                          10 -[MCThrowingInvocationOperation main] + 40 (MailCore) [0x7fff881f4808]
                            10 -[MCMonitoredInvocation invoke] + 211 (MailCore) [0x7fff881d1b74]
                              10 -[NSInvocation invoke] + 308 (CoreFoundation) [0x7fff919f9c54]
                                10 __invoking___ + 140 (CoreFoundation) [0x7fff919f9dec]
                                  10 -[MFIMAPAccount _fetchUnreadCountsCheckForNewMessages:] + 760 (Mail) [0x7fff93b163c6]
                                    10 -[MFRemoteStoreAccount _synchronizeMailboxesSynchronously] + 738 (Mail) [0x7fff93c0f25a]
                                      10 -[MFLibraryIMAPStore _fetchForCheckingNewMail:] + 54 (Mail) [0x7fff93b5d0e5]
                                        10 -[MFLibraryIMAPStore _openSynchronouslyUpdatingMetadata:withOptions:] + 279 (Mail) [0x7fff93b5ca0a]
                                          10 -[MFLibraryIMAPStore _gatewayCreateIfNeeded:options:] + 158 (Mail) [0x7fff93b65ec8]
                                            10 -[MFIMAPAccount _gatewayForMailbox:name:options:] + 272 (Mail) [0x7fff93b10506]
                                              10 -[MFIMAPAccount _getPotentialGatewayForMailbox:options:createdNewConnection:needsSelect:] + 474 (Mail) [0x7fff93b109a0]
                                                10 -[IMAPConnectionPool checkOutGatewayForMailbox:newConnection:highPriority:waitIndefinitely:] + 320 (IMAP) [0x7fff92a175ca]
                                                  10 -[IMAPConnectionPool removeInvalidConnections] + 95 (IMAP) [0x7fff92a151e9]
                                                    10 -[IMAPConnectionPool _removeInvalidConnectionsInDictionary:] + 286 (IMAP) [0x7fff92a1535b]
                                                      10 -[IMAPConnection isValidPreferringNetworkCheck:] + 61 (IMAP) [0x7fff92a0c630]
                                                        10 -[IMAPConnection connectionState] + 278 (IMAP) [0x7fff92a0bf2f]
                                                          10 -[IMAPGateway addClientOperation:toQueueAndWaitUntilFinished:] + 397 (IMAP) [0x7fff92a1ff77]
                                                            10 -[IMAPGateway waitUntilClientOperationIsFinished:] + 184 (IMAP) [0x7fff92a20041]
                                                              10 -[IMAPClientOperationQueue waitUntilOperationIsFinished:] + 228 (IMAP) [0x7fff92a06060]
                                                                10 -[__NSOperationInternal _waitUntilFinishedOrTimeout:outer:] + 218 (Foundation) [0x7fff8eae2ae0]
                                                                  10 __psynch_cvwait + 10 (libsystem_kernel.dylib) [0x7fff863cd716]
                                                                   *10 psynch_cvcontinue + 0 (pthread) [0xffffff7f80c14940]
      Thread 0x1ea7ed   DispatchQueue 9342       priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea738   DispatchQueue 31186      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 1035 (IMAP) [0x7fff92a163b5]
                              10 -[IMAPConnectionPool _makeConnectionAvailable:] + 438 (IMAP) [0x7fff92a19442]
                                10 -[IMAPConnectionPool _newGatewayForConnection:mailboxName:] + 64 (IMAP) [0x7fff92a1925e]
                                  10 -[IMAPGateway initWithIMAPConnection:mailbox:pool:] + 564 (IMAP) [0x7fff92a1e7a2]
                                    10 +[_IMAPClientSimulatedSelectOperation newWithMailboxName:] + 89 (IMAP) [0x7fff92a1e4ad]
                                      10 -[__NSOperationInternal _waitUntilFinished:] + 93 (Foundation) [0x7fff8eae45a9]
                                        10 __psynch_cvwait + 10 (libsystem_kernel.dylib) [0x7fff863cd716]
                                         *10 psynch_cvcontinue + 0 (pthread) [0xffffff7f80c14940]
      Thread 0x1ea718   DispatchQueue 44622      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea5c4   DispatchQueue 46650      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7bf   DispatchQueue 91263      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea82d   DispatchQueue 91341      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7a2   DispatchQueue 91522      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea8c7   DispatchQueue 91614      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea75a   DispatchQueue 91893      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7fb   DispatchQueue 91985      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea8ab   DispatchQueue 92159      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea208   DispatchQueue 92260      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea83a   DispatchQueue 92359      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea8a6   DispatchQueue 92457      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7c4   DispatchQueue 92724      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7f7   DispatchQueue 92848      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea79f   DispatchQueue 92919      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea856   DispatchQueue 93624      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea7dd   DispatchQueue 94012      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea8b2   DispatchQueue 94104      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea82a   DispatchQueue 94188      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea8f8   DispatchQueue 94241      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                10 _dispatch_async_redirect_invoke + 154 (libdispatch.dylib) [0x7fff8e8db7ff]
                  10 _dispatch_client_callout + 8 (libdispatch.dylib) [0x7fff8e8d72ad]
                    10 __NSOQSchedule_f + 64 (Foundation) [0x7fff8ea8023b]
                      10 -[__NSOperationInternal _start:] + 631 (Foundation) [0x7fff8ea80591]
                        10 -[NSBlockOperation main] + 75 (Foundation) [0x7fff8eaa1055]
                          10 __51-[IMAPGateway _tryToCheckInConnectionAndTryToIdle:]_block_invoke + 268 (IMAP) [0x7fff92a1ee22]
                            10 -[IMAPConnectionPool checkInConnection:forGateway:] + 50 (IMAP) [0x7fff92a15fdc]
                              10 -[NSRecursiveLock lock] + 22 (Foundation) [0x7fff8ea7c0ae]
                                10 __psynch_mutexwait + 10 (libsystem_kernel.dylib) [0x7fff863cd746]
                                 *10 psynch_mtxcontinue + 0 (pthread) [0xffffff7f80c13a3b]
      Thread 0x1ea90d   DispatchQueue 94513      priority 46       
      10 start_wqthread + 13 (libsystem_pthread.dylib) [0x7fff91ed8fb9]
        10 _pthread_wqthread + 314 (libsystem_pthread.dylib) [0x7fff91ed5ef8]
          10 _dispatch_worker_thread2 + 40 (libdispatch.dylib) [0x7fff8e8da193]
            10 _dispatch_root_queue_drain + 326 (libdispatch.dylib) [0x7fff8e8d909e]
              10 _dispatch_client_callout + 8 (

    Phil, Why do you think that it is Safari?
    Are you running any #3rd party applications as well?
    If a proprietary (Apple) application "locks up"... it should not bring down the whole system; rather, one should be able to force quit the application that only appears to be hanging the entire system (press option, command & esc keys for the "Force Quit" application menu).
    After a force quit of a proprietary application, it then should open right back up without a reboot. The system should not hang. For example, if Safari does "hang" w/a spinning beachball & you force quit that & then fire it up again -- as opposed to a machine that completely "locks up" as you say... that term is usually reserved for when absolutely everything is frozen which calls for the radical power-button force shutdown.

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