Date: Wed, 20 Nov 2002 02:17:18 -0800 From: "Joel M. Baldwin" <qumqats@outel.org> To: current@freebsd.org Subject: panic: sleeping thread owns a mutex - with debug traceback Message-ID: <167309338.1037758638@[192.168.1.20]>
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Under heavy system load and heavy swapping I had the following
panic occur.
-------------------------------------------------------------
Panic message from the serial console:
panic: sleeping thread owns a mutex
cpuid = 1; lapic.id = 01000000
Debugger("panic")
Stopped at Debugger+0x55: xchgl %ebx,in_Debugger.0
db> panic t
Debugger(c0392fc9,1000000,c0392171,cd29ac18,1) at Debugger+0x55
panic(c0392171,1,c03920e8,6b,c039614a) at panic+0x11f
propagate_priority(c0eadc40,2,c03920e8,23b,c03cffa0) at
propagate_priority+0x104
_mtx_lock_sleep(c3520a20,0,c039f4dd,182,c040af98) at
_mtx_lock_sleep+0x219
_mtx_lock_flags(c3520a20,0,c039f4dd,182,c0393d1d) at
_mtx_lock_flags+0x98
syncache_timer(1,0,c0393d1d,bf,220649) at syncache_timer+0xaf
softclock(0,0,c0390a04,230,c0eac700) at softclock+0x19c
ithread_loop(c0ea0600,cd29ad48,c0390767,355,0) at ithread_loop+0x182
fork_exit(c01fef40,c0ea0600,cd29ad48) at fork_exit+0xa5
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xcd29ad7c, ebp = 0 ---
db> panic
panic: from debugger
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1
Uptime: 6h11m40s
pfs_vncache_unload(): 1 entries remaining
Dumping 255 MB
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
Dump complete
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
cpu_reset called on cpu#1
cpu_reset: Restarting BSP
cpu_reset_proxy: Stopped CPU 1
--------------------------------------------------------------------
kgdb traceback information:
su-2.05b# gdb -k
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "i386-undermydesk-freebsd".
(kgdb) symbol-file
/usr/src/sys/i386/compile/testGeneric.smp/kernel.debug
Reading symbols from
/usr/src/sys/i386/compile/testGeneric.smp/kernel.debug...done.
(kgdb) exec-file /boot/kernel.testgeneric.smp/kernel
(kgdb) core-file /var/crash/vmcore.30
panic: from debugger
panic messages:
---
panic: sleeping thread owns a mutex
cpuid = 1; lapic.id = 01000000
panic: from debugger
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1
Uptime: 6h11m40s
pfs_vncache_unload(): 1 entries remaining
Dumping 255 MB
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
---
#0 doadump () at ../../../kern/kern_shutdown.c:232
232 dumping++;
(kgdb) where
#0 doadump () at ../../../kern/kern_shutdown.c:232
#1 0xc02118bd in boot (howto=260) at ../../../kern/kern_shutdown.c:364
#2 0xc0211b77 in panic () at ../../../kern/kern_shutdown.c:517
#3 0xc014d252 in db_panic () at ../../../ddb/db_command.c:450
#4 0xc014d1d2 in db_command (last_cmdp=0xc03bf2a0, cmd_table=0x0,
aux_cmd_tablep=0xc03b5ec8,
aux_cmd_tablep_end=0xc03b5ee0) at ../../../ddb/db_command.c:346
#5 0xc014d2e6 in db_command_loop () at ../../../ddb/db_command.c:472
#6 0xc014ff7a in db_trap (type=3, code=0) at ../../../ddb/db_trap.c:72
#7 0xc033e2a0 in kdb_trap (type=3, code=0, regs=0xcd29ab90) at
../../../i386/i386/db_interface.c:166
#8 0xc03572cf in trap (frame=
{tf_fs = -1069547496, tf_es = 16, tf_ds = -1069744112, tf_edi =
-1058350016, tf_esi = 256, tf_ebp = -852907044, tf_isp = -852907076,
tf_ebx = 0, tf_edx = 0, tf_ecx = 1, tf_eax = 18, tf_trapno = 3, tf_err
= 0, tf_eip = -1070340715, tf_cs = 8, tf_eflags = 662, tf_esp =
-1069880826, tf_ss = -1069994039}) at ../../../i386/i386/trap.c:603
#9 0xc033fac8 in calltrap () at {standard input}:99
#10 0xc0211b5f in panic (fmt=0x0) at ../../../kern/kern_shutdown.c:503
#11 0xc0207b54 in propagate_priority (td=0x0) at
../../../kern/kern_mutex.c:125
#12 0xc0208329 in _mtx_lock_sleep (m=0xc3520a20, opts=0,
file=0xc039f4dd "../../../netinet/tcp_syncache.c", line=386) at
../../../kern/kern_mutex.c:624
#13 0xc0207db8 in _mtx_lock_flags (m=0xc3520a20, opts=0,
file=0xc039f4dd "../../../netinet/tcp_syncache.c", line=386) at
../../../kern/kern_mutex.c:325
#14 0xc029b9ef in syncache_timer (xslot=0x1) at
../../../netinet/tcp_syncache.c:386
#15 0xc021f51c in softclock (dummy=0x0) at
../../../kern/kern_timeout.c:195
#16 0xc01ff0c2 in ithread_loop (arg=0xc0ea0600) at
../../../kern/kern_intr.c:535
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