Random server freezes

Hi!
I'm using Oracle 10g2 on Centos 5 x64
Server Dell R900
Due to database low performance we decided to increase server physical memory from 16G to 22G and mem distribution changed this way:
Before Oracke 5G (4sga + 1pga), 11G to OS needs
After Oracle 15G(10sga+5pga), 7G to OS needs.
I was using 80-20 rule of thumb and decided that 7G must be sufficient since it is even more than 20%.
Our DB server in dedicated mode and there are about 150 users using database.
So, after 1 week of monitoring there were several issues with server:
- Oracle listener went down several times
- Server has been freezing 2 times so I had to restart it physically (nothing in alert log and system journal too)
Can it be issue with low memory size left to OS?
I am new to oracle administration, so, any clue on this would be appreciated much.
Thanks.
Edited by: user9339570 on May 1, 2013 7:52 AM

Thanks for your response. There was tnslsnr segmentation fault in the log message.
Any thoughts, guys?
This is the last message before server freeze:
Apr 30 15:41:44 bittl kernel: BUG: soft lockup - CPU#6 stuck for 10s! [oracle:19152]
Apr 30 15:41:48 bittl kernel: CPU 6:
Apr 30 15:41:48 bittl kernel: Modules linked in: nfsd exportfs auth_rpcgss autofs4 hidp nfs lockd fscache nfs_acl rfcomm l2cap bluetooth sunrpc ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi scsi_transport_iscsi dm_mirror dm_multipath dm_mod video sbs backlight i2c_ec i2c_core button battery asus_acpi acpi_memhotplug ac ipv6 xfrm_nalgo crypto_api parport_pc lp parport sg shpchp bnx2 serio_raw pcspkr ide_cd cdrom ata_piix libata megaraid_sas sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Apr 30 15:41:48 bittl kernel: Pid: 19152, comm: oracle Not tainted 2.6.18-92.el5 #1
Apr 30 15:41:48 bittl kernel: RIP: 0010:[<ffffffff80064aa8>] [<ffffffff80064aa8>] spinunlock_irqrestore+0x8/0x9
Apr 30 15:41:48 bittl kernel: RSP: 0000:ffff81053fc73d98 EFLAGS: 00000202
Apr 30 15:41:48 bittl kernel: RAX: 00000000ffffffff RBX: ffff81000001f600 RCX: 0000000000000027
Apr 30 15:41:48 bittl kernel: RDX: ffff8100a420c2a8 RSI: 0000000000000202 RDI: ffff81000001ff80
Apr 30 15:41:48 bittl kernel: RBP: ffff81053fc73d10 R08: 0000000000000010 R09: 0000000000000000
Apr 30 15:41:48 bittl kernel: R10: ffff81010af82750 R11: 0000000000000001 R12: ffffffff8005dc8e
Apr 30 15:41:48 bittl kernel: R13: ffff81010af82750 R14: ffffffff80076f1d R15: ffff81053fc73d10
Apr 30 15:41:48 bittl kernel: FS: 00002b63960d1c40(0000) GS:ffff81053fc21b40(0000) knlGS:0000000000000000
Apr 30 15:41:48 bittl kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Apr 30 15:41:48 bittl kernel: CR2: 00002b06b9289028 CR3: 0000000134c33000 CR4: 00000000000006e0
Apr 30 15:41:48 bittl kernel:
Apr 30 15:41:48 bittl kernel: Call Trace:
Apr 30 15:41:48 bittl kernel: <IRQ> [<ffffffff80010794>] rotate_reclaimable_page+0xbe/0xcc
Apr 30 15:41:49 bittl kernel: [<ffffffff80039c98>] end_page_writeback+0x14/0x47
Apr 30 15:41:49 bittl kernel: [<ffffffff800ca041>] end_swap_bio_write+0x65/0x73
Apr 30 15:41:49 bittl kernel: [<ffffffff8002cd49>] __end_that_request_first+0x1b3/0x52d
Apr 30 15:41:49 bittl kernel: [<ffffffff8005bf4e>] blk_run_queue+0x41/0x72
Apr 30 15:41:49 bittl kernel: [<ffffffff88079fac>] :scsi_mod:scsi_end_request+0x27/0xcb
Apr 30 15:41:49 bittl kernel: [<ffffffff8807a19e>] :scsi_mod:scsi_io_completion+0x14e/0x324
Apr 30 15:41:49 bittl kernel: [<ffffffff880a642a>] :sd_mod:sd_rw_intr+0x212/0x23f
Apr 30 15:41:49 bittl kernel: [<ffffffff8807a433>] :scsi_mod:scsi_device_unbusy+0x67/0x81
Apr 30 15:41:49 bittl kernel: [<ffffffff80037869>] blk_done_softirq+0x5f/0x6d
Apr 30 15:41:49 bittl kernel: [<ffffffff80011ed2>] __do_softirq+0x5e/0xd6
Apr 30 15:41:49 bittl kernel: [<ffffffff8005e2fc>] call_softirq+0x1c/0x28
Apr 30 15:41:50 bittl kernel: [<ffffffff8006c571>] do_softirq+0x2c/0x85
Apr 30 15:41:50 bittl kernel: [<ffffffff8005dc8e>] apic_timer_interrupt+0x66/0x6c
Apr 30 15:41:50 bittl kernel: <EOI> [<ffffffff8000cfb2>] __pagevec_lru_add_active+0xbc/0xda
Apr 30 15:41:50 bittl kernel: [<ffffffff8000cf86>] __pagevec_lru_add_active+0x90/0xda
Apr 30 15:41:50 bittl kernel: [<ffffffff8001651a>] __lru_add_drain+0x41/0x80
Apr 30 15:41:50 bittl kernel: [<ffffffff800478a5>] __pagevec_release+0x9/0x22
Apr 30 15:41:50 bittl kernel: [<ffffffff800c3ef0>] shrink_active_list+0x389/0x426
Apr 30 15:41:50 bittl kernel: [<ffffffff80012bc8>] shrink_zone+0xd8/0x11c
Apr 30 15:41:50 bittl kernel: [<ffffffff800c4f94>] try_to_free_pages+0x197/0x2b9
Apr 30 15:41:50 bittl kernel: [<ffffffff8000f1e9>] __alloc_pages+0x1cb/0x2ce
Apr 30 15:41:50 bittl kernel: [<ffffffff80010da7>] do_wp_page+0x303/0x6bd
Apr 30 15:41:50 bittl kernel: [<ffffffff800093b2>] __handle_mm_fault+0xd62/0xe23
Apr 30 15:41:50 bittl kernel: [<ffffffff800166a1>] prio_tree_insert+0x148/0x231
Apr 30 15:41:50 bittl kernel: [<ffffffff8006681f>] do_page_fault+0x4cb/0x830
Apr 30 15:41:50 bittl kernel: [<ffffffff8001c750>] vma_link+0xd0/0xfd
Apr 30 15:41:50 bittl kernel: [<ffffffff8000dde2>] do_mmap_pgoff+0x66c/0x7d7
Apr 30 15:41:50 bittl kernel: [<ffffffff8005dde9>] error_exit+0x0/0x84
Apr 30 15:41:50 bittl kernel:
Apr 30 15:44:16 bittl kernel: tnslsnr[7335]: segfault at 0000000000000018 rip 000000351786fabe rsp 00007fff951c6290 error 4
Apr 30 16:11:59 bittl kernel: hda: irq timeout: status=0xd0 { Busy }
Apr 30 16:11:59 bittl kernel: ide: failed opcode was: unknown
Apr 30 16:11:59 bittl kernel: hda: ATAPI reset complete
Apr 30 17:05:06 bittl syslogd 1.4.1: restart.

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Hi,
For the last month, I have been having random screen freezes , requiring me to hard-boot the computer. During this freeze the mouse is responsive. I wait 15 minutes to see if the freeze goes away before rebooting.
I have re-formatted the disk and installed Mountain Lion, again , but it did not help. Most of the time it seemed to happen when I am using Safari, but this is not always the case.
The hardware tests came clean.
I have isolated the console logs to the following just before the issue happens. Any suggestions on how to proceed?
9/20/13 5:24:58.068 AM
com.apple.backupd-helper[891]
Not starting scheduled Time Machine backup - time machine destination not resolvable.
9/20/13 5:25:06.836 AM
Safari[205]
CGContextClipToRect: invalid context 0x0
9/20/13 5:28:03.257 AM
fseventsd[51]
disk logger: failed to open output file /Volumes/NO NAME/.fseventsd/0000000001329d08 (No such file or directory). mount point /Volumes/NO NAME/.fseventsd
9/20/13 5:28:03.257 AM
fseventsd[51]
disk logger: failed to open output file /Volumes/NO NAME/.fseventsd/0000000001329d08 (No such file or directory). mount point /Volumes/NO NAME/.fseventsd
9/20/13 5:28:03.257 AM
fseventsd[51]
failed to unlink old log file /Volumes/NO NAME/.fseventsd/0000000001329d08 (No such file or directory)
9/20/13 5:28:03.257 AM
fseventsd[51]
failed to unlink old log file /Volumes/NO NAME/.fseventsd/0000000001329d08 (No such file or directory)
9/20/13 5:28:03.257 AM
fseventsd[51]
unmounting: failed to remove log dir /Volumes/NO NAME/.fseventsd (No such file or directory)
9/20/13 5:28:03.258 AM
fseventsd[51]
disk logger: failed to open output file /Volumes/My Passport for Mac/.fseventsd/0000000001329af1 (No such file or directory). mount point /Volumes/My Passport for Mac/.fseventsd
9/20/13 5:28:03.258 AM
fseventsd[51]
disk logger: failed to open output file /Volumes/My Passport for Mac/.fseventsd/0000000001329af1 (No such file or directory). mount point /Volumes/My Passport for Mac/.fseventsd
9/20/13 5:28:04.419 AM
DiskImages UI Agent[906]
*** -[NSMachPort handlePortMessage:]: dropping incoming DO message because the connection is invalid
9/20/13 5:28:05.565 AM
CoreServicesUIAgent[903]
Error: qtn_file_apply_to_path error: Read-only file system
9/20/13 5:28:06.687 AM
Installer[929]
CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
9/20/13 5:33:35.000 AM
bootlog[0]
BOOT_TIME 1379680415 0

Back up all data immediately as your boot drive may be failing.
If you have more than one user account, these instructions must be carried out as an administrator. I've tested them only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CReq 'Channel t|GPU D|I/O|n Cause: -' | tail | open -ef
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. Normally the command will produce no output, and the window will be empty. If the TextEdit window (not the Terminal window) has anything in it, post it — the text, please, not a screenshot. The title of the TextEdit window doesn't matter, and you don't need to post that.

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