Date: Mon, 22 Jul 2002 19:14:22 -0400 From: Anthony Jenkins <abjenkins@attbi.com> To: current <current@freebsd.org> Subject: Panic + lock order reversal (SMP Athlon) Message-ID: <3D3C91CE.5060108@attbi.com>
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System was cvsup'd yesterday afternoon:
FreeBSD 5.0-CURRENT #4: Sun Jul 21 23:43:59 EDT 2002
ajenkins@foo:/usr/obj/usr/src/sys/MYKERNEL-5.0
Background fsck was started and I waited a decent amount of time after
the login: prompt showed up before logging into root. Root (bash)
prompt displayed after /etc/motd and immediately after the serial
console gets the panic:
Starting background filesystem checks
Mon Jul 22 18:57:46 EDT 2002
lock order reversal
1st 0xc034aee0 sysctl sysctllock (sysctl sysctllock) @
/usr/src/sys/kern/kern_sysctl.c:1181
2nd 0xc03179e0 Giant (Giant) @ /usr/src/sys/dev/isp/isp_freebsd.c:2065
dev = da0s1g, block = 6657576, fs = /usr
panic: ffs_blkfree: freeing free block
cpuid = 1; lapic.id = 00000000
Debugger("panic")
Stopped at Debugger+0x46: xchgl %ebx,in_Debugger.0
db> trace
Debugger(c02e10fa) at Debugger+0x46
panic(c02f0e00,c02f0de0,c41ca44c,659628,0) at panic+0xde
ffs_blkfree(c41d0800,c41fa000,659628,0,4000) at ffs_blkfree+0x418
indir_trunc(c41a1a00,1966180,0,0,f600c,0,d6a3dc40) at indir_trunc+0x290
indir_trunc(c41a1a00,1964740,0,1,100c,0,d6a3dc40) at indir_trunc+0x26b
handle_workitem_freeblocks(c41a1a00,0) at handle_workitem_freeblocks+0x1d0
process_worklist_item(0,0) at process_worklist_item+0x170
softdep_process_worklist(0) at softdep_process_worklist+0xb4
sched_sync(0,d6a3dd48,c1585c00,c01f69f4,0) at sched_sync+0x17e
fork_exit(c01f69f4,0,d6a3dd48) at fork_exit+0x94
fork_trampoline() at fork_trampoline+0x1a
db> locks
No such command
db> show locks
exclusive sleep mutex Giant r = 0 (0xc03179e0) locked @
/usr/src/sys/dev/isp/isp_freebsd.c:2065
db>
I just got my 2nd Athlon MP chip today, hopefully this is similar to the
last time I crashed while in background fsck.... Let me know if any
more info is needed, I'll play with the coredump a bit.
--
Anthony Jenkins
http://www.mindspring.com/~abjenkins/
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