Date: Tue, 20 Jul 2010 11:47:54 -0500 From: Alan Cox <alan.l.cox@gmail.com> To: "Mikhail T." <mi+thun@aldan.algebra.com> Cc: stable@freebsd.org Subject: Re: today's 8.1/i386: panic: bad pte Message-ID: <AANLkTinDxPqL5zfxkqTuJvAqW8qY8HJVq0jL-Lc3i54P@mail.gmail.com> In-Reply-To: <4C4528A8.5040605@aldan.algebra.com> References: <4C4528A8.5040605@aldan.algebra.com>
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On Mon, Jul 19, 2010 at 11:40 PM, Mikhail T.
<mi+thun@aldan.algebra.com<mi%2Bthun@aldan.algebra.com>
> wrote:
> Some part of KDE4's kdm crashed at start-up and seems to have taken the
> entire machine with it:
>
> kgdb /boot/kernel/kernel /var/crash/vmcore.22
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
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> conditions.
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> There is absolutely no warranty for GDB. Type "show warranty" for
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> This GDB was configured as "i386-marcel-freebsd"...
>
> Unread portion of the kernel message buffer:
> <6>pid 18398 (drkonqi), uid 0: exited on signal 11 (core dumped)
> TPTE at 0xbfca9488 IS ZERO @ VA 2a522000
> panic: bad pte
> Uptime: 2h28m24s
> Physical memory: 1263 MB
> Dumping 195 MB: 180 164 148 132 116 100 84 68 52 36 20 4
>
> Reading symbols from /boot/kernel/splash_pcx.ko...Reading symbols
> from /boot/kernel/splash_pcx.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/splash_pcx.ko
> Reading symbols from /boot/kernel/vesa.ko...Reading symbols from
> /boot/kernel/vesa.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/vesa.ko
> Reading symbols from /boot/modules/nvidia.ko...done.
> Loaded symbols for /boot/modules/nvidia.ko
> Reading symbols from /boot/kernel/linux.ko...Reading symbols from
> /boot/kernel/linux.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/linux.ko
> Reading symbols from /boot/kernel/acpi.ko...Reading symbols from
> /boot/kernel/acpi.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/acpi.ko
> Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols
> from /boot/kernel/linprocfs.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/linprocfs.ko
> #0 doadump () at pcpu.h:231
> 231 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
> (kgdb) bt full
> #0 doadump () at pcpu.h:231
> No locals.
> #1 0xc05d10a4 in boot (howto=260) at
> /usr/src/sys/kern/kern_shutdown.c:416
> _giantcnt = Variable "_giantcnt" is not available.
> (kgdb) where
> #0 doadump () at pcpu.h:231
> #1 0xc05d10a4 in boot (howto=260) at
> /usr/src/sys/kern/kern_shutdown.c:416
> #2 0xc05d12b1 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:590
> #3 0xc07f0406 in pmap_remove_pages (pmap=0xc85bbc78) at
> /usr/src/sys/i386/i386/pmap.c:4198
> #4 0xc079516b in vmspace_exit (td=0xc51f3a00) at
> /usr/src/sys/vm/vm_map.c:409
> #5 0xc05a7253 in exit1 (td=0xc51f3a00, rv=139) at
> /usr/src/sys/kern/kern_exit.c:303
> #6 0xc05d3296 in sigexit (td=0xc51f3a00, sig=139) at
> /usr/src/sys/kern/kern_sig.c:2872
> #7 0xc05d47a8 in postsig (sig=11) at /usr/src/sys/kern/kern_sig.c:2759
> #8 0xc06082f8 in ast (framep=0xe5fafd38) at
> /usr/src/sys/kern/subr_trap.c:234
> #9 0xc07e2c44 in doreti_ast () at
> /usr/src/sys/i386/i386/exception.s:368
>
> Does this look familiar to anyone? Thanks!
>
>
Historically, this panic has indicated flakey memory. This panic occurs
because a memory location within a page table has unexpectedly changed to
zero.
Alan
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