Date: Tue, 7 Sep 2004 14:42:18 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-current@FreeBSD.org Cc: current@FreeBSD.org Subject: Re: Kernel panic in 6.0 revisited Message-ID: <200409071442.18490.jhb@FreeBSD.org> In-Reply-To: <1094273843.92485.11.camel@shumai.marcuscom.com> References: <1094273843.92485.11.camel@shumai.marcuscom.com>
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On Saturday 04 September 2004 12:57 am, Joe Marcus Clarke wrote:
> A few days ago, I reported a kernel panic in HEAD while building
> packages on my tinderbox machine. I was unable to get a core dump fro
> that crash, and after switching from ULE to 4BSD, I had thought it had
> gone away.
>
> Well, today, the machine panicked twice. It was the same panic both
> times, and the same panic I got a few days ago. This time, however, I
> was able to get a core dump. Here is the panic message:
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address = 0x1c
> fault code = supervisor write, page not present
> instruction pointer = 0x8:0xc0533d07
> stack pointer = 0x10:0xf5f30a4c
> frame pointer = 0x10:0xf5f30a58
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 27441 (cpp0)
> Stopped at vfs_vmio_release+0x1b: lock cmpxchgl %ecx,0x1c(%edx)
>
> And here is the output of "l *vfs_vmio_release+0x1b":
>
> 0xc0533d07 is in vfs_vmio_release (atomic.h:154).
> 149 static __inline int
> 150 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
> 151 {
> 152 int res = exp;
> 153
> 154 __asm __volatile (
> 155 " " __XSTRING(MPLOCKED) " "
> 156 " cmpxchgl %1,%2 ; "
> 157 " setz %%al ; "
> 158 " movzbl %%al,%0 ; "
>
> Kernel config is at http://www.marcuscom.com/downloads/FUGU.kernel and
> the dmesg output is at http://www.marcuscom.com/downloads/FUGU.dmesg
>
> Let me know if you need anything else. Thanks.
How about 'l *0xc0533d00' to try and figure out which function is calling
that. Also, do you have INVARIANTS turned on?
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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