Fire! Core dump in pthread_mutex_lock

Question

Hi, All,
Here is the pstack information from dbx.
t@1 (l@1) terminated by signal SEGV (access to address exceeded protections)
0xfd90b258: locktry_adaptive : ldstub [%o0 + 12], %o1
(dbx) where
current thread: t@1
=>[1] locktry_adaptive(0x10018, 0x2089c, 0x64d530, 0x85e18, 0xffbef338, 0x20bd288), at 0xfd90b258
[2] tipthread_mutex_lock(0x0, 0xfd91c000, 0x10018, 0x3, 0x0, 0x0), at 0xfd8fb798
[3] cmgCall::sendEventIn(0x224e010, 0x2, 0x209144b, 0x3, 0x10018, 0x6ef910), at 0xfe4912bc
[4] cmgSs7Adapter::inputNetMsg(0xfe50db20, 0x2091430, 0xfe5f677c, 0x3, 0x1a7d5e0, 0xfe5b85c4), at 0xfe50d060
[5] cmgCallMgr::forwardNetEvent(0x28b010, 0xaf6f10, 0x100a, 0x100b, 0xfe5526eb, 0x0), at 0xfe4a6c40
[6] engIOS_EvtHdlr::handleEvent(0x25e1f0, 0xaf6f10, 0x0, 0xbd07c, 0x5, 0x2), at 0xfe1f4a7c
[7] XEEvtDispatcher::run(0x1b9010, 0xdce170, 0x1b9124, 0x1b9078, 0x1, 0x710381), at 0xfe96bac4
[8] XEProcShell::run(0x1b69a0, 0x800, 0x9a8, 0xfea06630, 0x1bb610, 0x1), at 0xfe991ce8
[9] main(0x3, 0xffbefb54, 0xffbefb64, 0x1617d0, 0x0, 0x0), at 0x26238
(dbx) regs
current thread: t@1
current frame: [1]
g0-g1 0x00000000 0x00000000 0x00000000 0x0001b000
g2-g3 0x00000000 0x00000001 0x00000000 0xfe8ead08
g4-g5 0x00000000 0x00000074 0x00000000 0xffbef32c
g6-g7 0x00000000 0x00000000 0x00000000 0x00193778
o0-o1 0x00000000 0x00010018 0x00000000 0x0002089c
o2-o3 0x00000000 0x0064d530 0x00000000 0x00085e18
o4-o5 0x00000000 0xffbef338 0x00000000 0x020bd288
o6-o7 0x00000000 0xffbef318 0x00000000 0xfd8fb798
l0-l3 0x00000000 0xfcfc35e4 0x00000009 0x00000000
l4-l7 0x0064d530 0xfe8db0e8 0x0064d530 0xfe5b85c4
i0-i3 0x00000000 0xfd91c000 0x00010018 0x00000003
i4-i7 0x00000000 0x00000000 0xffbef378 0xfe4912bc
y 0x000f7c26
psr 0xfe401001
pc 0xfd90b258:_lock_try_adaptive ldstub [%o0 + 12], %o1
npc 0xfd90b25c:_lock_try_adaptive+0x4 tst %o1
(dbx) lwps
o>l@1 signal SIGSEGV in locktry_adaptive()
l@2 LWP suspended in libcsigaction()
l@3 LWP suspended in ___lwp_cond_wait()
l@27 LWP suspended in ___lwp_cond_wait()
l@28 LWP suspended in private___lwp_cond_wait()
l@29 LWP suspended in writeValue<unsigned short>()
l@24 LWP suspended in __door_call()
(dbx)
Could you help investigate it?
Thanks!
Eric

Answer 1

Shouting Fire! in a crowded forum can cause a riot. People can get trampled.
Very bad. :-) But in this case, I don't think there is a riot coming.
You probably passed a 0 to the mutex function.
Try something like this in dbx:
(dbx) stop in tipthread_mutex_lock -if $o0 == 0
(dbx) run
See if it hits that breakpoint. If so, then your app is passing a zero
to that function.
Also, look at the code for cmdCall::sendEventIn and see if you
can tell if it might be passing a zero.