Date: Wed, 24 Jul 2002 22:18:10 -0400 From: Anthony Jenkins <abjenkins@attbi.com> To: current@freebsd.org Cc: Alex Zepeda <zipzippy@sonic.net> Subject: Re: Here's my most recent crash.. Message-ID: <3D3F5FE2.4050605@attbi.com> References: <20020724234939.GA422@blarf.homeip.net>
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Alex Zepeda wrote:
[ kdbg output removed]
>The most applicable dmesg output I could find was:
>
>Memory modified after free 0xc215d000(8188)
>panic: Most recently used by none
>
I've gotten this same panic with a kernel+world cvsup'd from Sun Jul 21
23:43 EDT, just got one a few minutes ago. I'm in the kernel debugger
since I haven't been able to get a dump to work since - well ever I
guess :-/ so I'll echo Alex's offer to entertain any debugger requests.
Interesting thing is the apparent page fault I got when I tried 'ps' at
the "db>" prompt:
lock order
reversal
1st 0xc4758160 process lock (process lock) @
/usr/src/sys/kern/kern_exec.c:335
2nd 0xc0314880 filelist lock (filelist lock) @
/usr/src/sys/kern/kern_descrip.c:1111
/usr/src/sys/vm/uma_core.c:1332: could sleep with "process lock" locked
from /usr/src/sys/kern/kern_exec.c:335
J/usr/src/sys/vm/uma_core.c:1332: could sleep with "process lock" locked
from /usr/src/sys/kern/kern_exec.c:335
/usr/src/sys/vm/uma_core.c:1332: could sleep with "process lock" locked
from /usr/src/sys/kern/kern_exec.c:335
Memory modified after free 0xc50e3d00(252)
panic: Most recently used by kqueue
cpuid = 0; lapic.id = 01000000
Debugger("panic")
Stopped at Debugger+0x46: xchgl %ebx,in_Debugger.0
db> ps
pid proc addr uid ppid pgrp flag stat wmesg wchan cmd
80562 c4883558 de3fd000 0 80533 0 0006002 New
Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic.id = 01000000
fault virtual address = 0x48
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc014111b
stack pointer = 0x10:0xde26fa18
frame pointer = 0x10:0xde26fa28
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = resume, IOPL = 0
current process = 80561 (sh)
kernel: type 12 trap, code=0
Stopped at Debugger+0x46: xchgl %ebx,in_Debugger.0
db> show locks
exclusive sleep mutex Giant r = 0 (0xc03179e0) locked @
/usr/src/sys/kern/kern_fork.c:119
db> bt
No such command
db> trace
Debugger(c02e10fa) at Debugger+0x46
panic(c02f7408,c02ddda0,c02f73e0,c50e3d00,fc) at panic+0xde
mtrash_ctor(c50e3d00,100,0) at mtrash_ctor+0x4c
uma_zalloc_arg(c082dc00,0,0) at uma_zalloc_arg+0xff
malloc(dc,c0314580,0,c50ffe00,1) at malloc+0x68
fdcopy(c467de40,c50ffe34,0,c02de191,1c9) at fdcopy+0x61
fork1(c467de40,14,de26fce0,c03179e0,0) at fork1+0x6c7
fork(c467de40,de26fd14,0,0,202) at fork+0x2a
syscall(2f,2f,2f,80f23ac,80f23ac) at syscall+0x23c
syscall_with_err_pushed() at syscall_with_err_pushed+0x1b
--- syscall (2, FreeBSD ELF32, fork), eip = 0x8076bb3, esp = 0xbfbff30c,
ebp = 0xbfbff328 ---
db>
I'm anxious to get something working, at least the dump+gdb/gdb52
facility, so I can do some type of debugging; it's either that or kill
the 150 day uptime FreeBSD-4.4 400MHz box and swap the two, but I was
hoping to debug some SMP on the new box </whine>.
--
Anthony Jenkins
http://www.mindspring.com/~abjenkins/
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