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Date:      Thu, 17 Oct 2002 16:27:41 -0700
From:      Lars Eggert <larse@ISI.EDU>
To:        current <current@FreeBSD.org>
Subject:   panic: mtx_lock() of spin mutex
Message-ID:  <3DAF476D.5040107@isi.edu>
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[-- Attachment #1 --]
Hi,

I'm tracking down a lock order reversal for hsu@, and just came across 
this other locking panic twice in the last few hours. I run with WITNESS 
and WITNESS_SKIPSPIN, and have never seen this happen unless I set 
debug.witness_ddb=1. The name of the mutex looks definitly fishy.

Let me knowif I can provide more information (tried to get a core dump, 
but machine hung hard after typing "panic".)

panic: mtx_lock() of spin mutex $,J@4(J@^@^GN@^D @ 
/usr/src/sys/kern/kern_descrip.c:488
cpuid = 1; lapic.id = 02000000
Debugger("panic")
Stopped at      Debugger+0x5a:  xchgl   %ebx,in_Debugger.0
db> trace
Debugger(c043d4b2,2000000,c043c6ef,eb519c70,1) at Debugger+0x5a
panic(c043c6ef,c04a2a74,c043a64f,1e8,eb519cb4) at panic+0x12f
_mtx_lock_flags(c04a2c34,0,c043a64f,1e8,c7238c00) at _mtx_lock_flags+0xa7
do_dup(c69fb9c0,1,ffffffff,4,c69fba54) at do_dup+0xe6
dup2(c69fb9c0,eb519d10,c046443d,42d,c69fa3e8) at dup2+0x33
syscall(2f,2f,2f,4,815aa00) at syscall+0x406
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (90, FreeBSD ELF32, dup2), eip = 0x80986cf, esp = 
0xbfbe74bc, ebp = 0xbfbe7988 ---
db> panic
panic: from debugger
cpuid = 1; lapic.id = 02000000
boot() called on cpu#1


Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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