It just happened again, here is the pstack output:
# pstack core
core 'core' of 1087: /usr/lib/firefox/firefox-bin -UILocale C -contentLocale
C
----------------- lwp# 1 / thread# 1 --------------------
fede53a5 _lwp_kill (1, b) + 15
fed91227 raise (b) + 1f
08068ac6 __1cNnsProfileLockSFatalSignalHandler6Fi_v_ (b, 0, 8046784) + e8
fede3e9f __sighndlr (b, 0, 8046784, 80689de) + f
fedda31e call_user_handler (b, 0, 8046784) + 22b
fedda49e sigacthandler (b, 0, 8046784) + bb
--- called from signal handler with signal 11 (SIGSEGV) ---
f72436ac __1cHSObjectLSetClipLink6Mp0_v_ (10101, 0) + 24
f722dc65 __1cHSObject2T6M_v_ (f61b7d30) + 39
f7246485 .XDB6Z25qRldGV6c.__SLIP.DELETER__J (f61b7d30, 1) + 1d
f71fc319 __1cLDisplayListKFinishHold6M_v_ (f5f37028) + 9f9
f725718d __1cMScriptThreadJDrawFrame6Mii_i_ (f5f400a0, 0, 1) + 3d5
f72572dc __1cMScriptThreadHDoFrame6Mii_v_ (f5f400a0, 1, 0) + d4
f728e83d __1cKCorePlayerGDoPlay6Mi_v_ (f5f37000, 1) + b79
f7090b59 __1cQUnixCommonPlayerHOnTimer6M_v_ (f5f37000) + 121
f7419dc2 __1cRglibTimerCallback6Fpv_i_ (f5f37000, 0, 80c3638) + f2
fe514588 g_timeout_dispatch (fe56f5e0, 2, 80c3638, 0, 3, c220) + 1a
fe56f5a0 g_source_callback_funcs (f5f37000, 0, 11, 65006e, a317ed0, f98f0ac2)
f7419cd0 __1cRglibTimerCallback6Fpv_i_ (0, 30000, 10003, 940000, 340000,
740000)
00000001 ???????? ()
----------------- lwp# 2 / thread# 2 --------------------
fede4e35 __pollsys (fa89eca0, 2, fa89ec78, 0) + 15
fed8e9b6 poll (fa89eca0, 2, 1589fef) + 52
febe97e5 _pr_poll_with_poll (80f3c68, 2, 869e7960) + 3c1
febe998a PR_Poll (80f3c68, 2, 869e7960) + 16
faa1015a __1cYnsSocketTransportServiceDRun6M_I_ (80f3780) + 5bf
fecc45f3 __1cInsThreadEMain6Fpv_v_ (80ef2c0) + 73
febeb6c9 _pt_root (80f3e10) + d1
fede3a91 _thr_setup (fa790200) + 4e
fede3d80 _lwp_start (fa790200, 0, 0, fa89eff8, fede3d80, fa790200)
----------------- lwp# 3 / thread# 3 --------------------
fede3df9 __lwp_park (80c28bc, 80c48c8, fa4cee88) + 19
fedde61e cond_wait_queue (80c28bc, 80c48c8, fa4cee88, 0) + 3b
fedde9be cond_wait_common (80c28bc, 80c48c8, fa4cee88) + 1df
feddebf2 _cond_timedwait (80c28bc, 80c48c8, fa4ceef8) + 51
feddec5d cond_timedwait (80c28bc, 80c48c8, fa4ceef8) + 24
feddec99 pthread_cond_timedwait (80c28bc, 80c48c8, fa4ceef8) + 1e
febe4462 PR_WaitCondVar (80c28b8, 403) + 24a
fecc7429 __1cLTimerThreadDRun6M_I_ (80c45a0) + 155
fecc45f3 __1cInsThreadEMain6Fpv_v_ (81d0200) + 73
febeb6c9 _pt_root (81d9f18) + d1
fede3a91 _thr_setup (fa790a00) + 4e
fede3d80 _lwp_start (fa790a00, 0, 0, fa4ceff8, fede3d80, fa790a00)
----------------- lwp# 6 / thread# 6 --------------------
fede3df9 __lwp_park (875f14c, 8712e00, 0) + 19
fedde61e cond_wait_queue (875f14c, 8712e00, 0, 0) + 3b
feddeb17 _cond_wait (875f14c, 8712e00) + 66
feddeb59 cond_wait (875f14c, 8712e00) + 21
feddeb92 pthread_cond_wait (875f14c, 8712e00) + 1b
febe4481 PR_WaitCondVar (875f148, ffffffff) + 269
f8c90bdd __1cLnsSSLThreadDRun6M_v_ (8719eb8, f8a8efd8, febeb6c9, 8719eb8, 0,
fa792200) + bc
f8c8f44e __1cVnsPSMBackgroundThreadOnsThreadRunner6Fpv_v_ (8719eb8) + e
febeb6c9 _pt_root (8712e60) + d1
fede3a91 _thr_setup (fa792200) + 4e
fede3d80 _lwp_start (fa792200, 0, 0, f8a8eff8, fede3d80, fa792200)
----------------- lwp# 7 / thread# 7 --------------------
fede3df9 __lwp_park (875f16c, 8712f20, 0) + 19
fedde61e cond_wait_queue (875f16c, 8712f20, 0, 0) + 3b
feddeb17 _cond_wait (875f16c, 8712f20) + 66
feddeb59 cond_wait (875f16c, 8712f20) + 21
feddeb92 pthread_cond_wait (875f16c, 8712f20) + 1b
febe4481 PR_WaitCondVar (875f168, ffffffff) + 269
f8c9195b __1cYnsCertVerificationThreadDRun6M_v_ (8712ed0, f898ffd8, febeb6c9,
8712ed0, 0, fa792a00) + 6b
f8c8f44e __1cVnsPSMBackgroundThreadOnsThreadRunner6Fpv_v_ (8712ed0) + e
febeb6c9 _pt_root (8712f80) + d1
fede3a91 _thr_setup (fa792a00) + 4e
fede3d80 _lwp_start (fa792a00, 0, 0, f898fff8, fede3d80, fa792a00)
----------------- lwp# 10 / thread# 10 --------------------
fede3df9 __lwp_park (8915c74, 887eb98, 0) + 19
fedde61e cond_wait_queue (8915c74, 887eb98, 0, 0) + 3b
feddeb17 _cond_wait (8915c74, 887eb98) + 66
feddeb59 cond_wait (8915c74, 887eb98) + 21
feddeb92 pthread_cond_wait (8915c74, 887eb98) + 1b
febe4481 PR_WaitCondVar (8915c70, ffffffff) + 269
f8236376 __1cUProcessAsyncMessages6F_v_ (fed2ac64, 8915c9c, fed0bc30,
f829f998, 887c6a0, f822efa8) + 80
f8236e6d __1cQAsyncWriteThreadDRun6M_I_ (88895d0) + 1d
fecc45f3 __1cInsThreadEMain6Fpv_v_ (8915c90) + 73
febeb6c9 _pt_root (887ec58) + d1
fede3a91 _thr_setup (fa794200) + 4e
fede3d80 _lwp_start (fa794200, 0, 0, f822eff8, fede3d80, fa794200)
----------------- lwp# 14 / thread# 14 --------------------
fede3df9 __lwp_park (8546d74, 8ae3aac, 0) + 19
fedde61e cond_wait_queue (8546d74, 8ae3aac, 0, 0) + 3b
feddeb17 _cond_wait (8546d74, 8ae3aac) + 66
feddeb59 cond_wait (8546d74, 8ae3aac) + 21
feddeb92 pthread_cond_wait (8546d74, 8ae3aac) + 1b
febe4481 PR_WaitCondVar (8546d70, ffffffff) + 269
febe4939 PR_Wait (8ae3aa8, ffffffff, fecc0224) + 39
fecc035b PL_WaitForEvent (8a7632c, 8ae3aa8, 8be4480, 2, 0, 0) + 143
08a7632c ???????? (746e6576, 65757120, 2e2e6575, 6854002e, 64616572, 65766520)
65206461 ???????? ()
----------------- lwp# 76 / thread# 76 --------------------
fede3df9 __lwp_park (82c77ec, 81b03b0, f773eea8) + 19
fedde61e cond_wait_queue (82c77ec, 81b03b0, f773eea8, 0) + 3b
fedde9be cond_wait_common (82c77ec, 81b03b0, f773eea8) + 1df
feddebf2 _cond_timedwait (82c77ec, 81b03b0, f773ef18) + 51
feddec5d cond_timedwait (82c77ec, 81b03b0, f773ef18) + 24
feddec99 pthread_cond_timedwait (82c77ec, 81b03b0, f773ef18) + 1e
febe4462 PR_WaitCondVar (82c77e8, 5b8d80) + 24a
fa9e5397 __1cOnsIOThreadPoolKThreadFunc6Fpv_v_ (81b0378) + 75
febeb6c9 _pt_root (9b6a900) + d1
fede3a91 _thr_setup (fa795a00) + 4e
fede3d80 _lwp_start (fa795a00, 0, 0, f773eff8, fede3d80, fa795a00)
----------------- lwp# 78 / thread# 78 --------------------
fede3df9 __lwp_park (80ef404, 80f4430, f876ee88) + 19
fedde61e cond_wait_queue (80ef404, 80f4430, f876ee88, 0) + 3b
fedde9be cond_wait_common (80ef404, 80f4430, f876ee88) + 1df
feddebf2 _cond_timedwait (80ef404, 80f4430, f876eef8) + 51
feddec5d cond_timedwait (80ef404, 80f4430, f876eef8) + 24
feddec99 pthread_cond_timedwait (80ef404, 80f4430, f876eef8) + 1e
febe4462 PR_WaitCondVar (80ef400, 5b8d80) + 24a
faa1dfe6 __1cOnsHostResolverPGetHostToLookup6MppnMnsHostRecord__i_ (80f43c8,
f876efa4) + 76
faa1e389 __1cOnsHostResolverKThreadFunc6Fpv_v_ (80f43c8) + b3
febeb6c9 _pt_root (92f76b8) + d1
fede3a91 _thr_setup (fa793200) + 4e
fede3d80 _lwp_start (fa793200, 0, 0, f876eff8, fede3d80, fa793200)
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