On Tuesday 12 October 2004 14:49, Herbert Poetzl wrote:
> > > > $ ksymoops -o /lib/modules/2.4.27-piv-smp-vs1.29-rc2/
> > > > -m /boot/System.map-2.4.27-piv-smp-vs1.29-rc2 oops1.txt
> > > > ksymoops 2.4.5 on i686 2.4.27-piv-smp-vs1.29-rc2. Options used
> > > > -V (default)
> > > > -k /proc/ksyms (default)
> > > > -l /proc/modules (default)
> > > > -o /lib/modules/2.4.27-piv-smp-vs1.29-rc2/ (specified)
> > > > -m /boot/System.map-2.4.27-piv-smp-vs1.29-rc2 (specified)
> > > >
> > > > Oct 12 02:11:34 aton kernel: Unable to handle kernel paging request at
> > virtual
> > > > address 4c4d3760
> > > > Oct 12 02:11:34 aton kernel: c015a00b
> > > > Oct 12 02:11:34 aton kernel: *pde = 00000000
> > > > Oct 12 02:11:34 aton kernel: Oops: 0000
> > > > Oct 12 02:11:34 aton kernel: CPU: 3
> > > > Oct 12 02:11:34 aton kernel: EIP: 0010:[do_select+379/576] Not
> > tainted
> > > > Oct 12 02:11:34 aton kernel: EFLAGS: 00010202
> > > > Oct 12 02:11:34 aton kernel: eax: 4c4d374c ebx: 00000000 ecx:
00000145
> > > > edx: ef741d00
> > > > Oct 12 02:11:34 aton kernel: esi: d0f9d600 edi: 00000015 ebp:
00200000
> > > > esp: f1b83f20
> > > > Oct 12 02:11:34 aton kernel: ds: 0018 es: 0018 ss: 0018
> > > > Oct 12 02:11:34 aton kernel: Process caspeng (pid: 1022,
> > stackpage=f1b83000)
> > > > Oct 12 02:11:34 aton kernel: Stack: c8218380 00000000 00000145
f1b82000
> > > > 00000000 00000000 00000000 00000000
> > > > Oct 12 02:11:34 aton kernel: c4bcb000 00000000 00000400
c429b300
> > > > bf7ff95c c015a449 00000020 f1b83f90
> > > > Oct 12 02:11:34 aton kernel: f1b83f8c 00000000 00000080
00000080
> > > > 0000041f c0380a08 fffffffd 00000020
> > > > Warning (Oops_read): Code line not seen, dumping what data is
available
> > > >
> > > >
> > > > >>eax; 4c4d374c Before first symbol
> > > > >>edx; ef741d00 <_end+2f346ca8/38891008>
> > > > >>esi; d0f9d600 <_end+10ba25a8/38891008>
> > > > >>ebp; 00200000 Before first symbol
> > > > >>esp; f1b83f20 <_end+31788ec8/38891008>
> > > >
> > > > I don't have any more lines of oops output.
> > > >
> > > > $ addr2line -f -e vmlinux1 c015a00b
> > > > do_select
> > > > /usr/src/2.4.27/linux-2.4.27/fs/select.c:197
> > > >
> > > > mask = POLLNVAL;
> > > > if (file) {
> > > > mask = DEFAULT_POLLMASK;
> > > > OOPS--> if (file->f_op && file->f_op->poll)
> > > > mask = file->f_op->poll(file,
> > wait);
> > > > fput(file);
> > > > }
> > >
> > > hmm, file is checked above, so file->f_op should be
> > > fine ergo file->f_op->poll must be bad ... question
> > > is, why ...
> > >
> > > could you disasm (objdump) the relevant function
> > > to see how the deref is coded?
> >
> > $ objdump -d --start-address=0xC0159E90 --stop-address=0xc015a0d2
vmlinux1
> >
> > vmlinux1: file format elf32-i386
> >
> > Disassembly of section .text:
> >
> > c0159e90 <do_select>:
>
> ...
>
> > c015a004: 8b 46 10 mov 0x10(%esi),%eax
> > c015a007: 85 c0 test %eax,%eax
> > c015a009: 74 0b je c015a016 <do_select+0x186>
> > =================== OOPS @ <do_select+0x17b> ========================
>
> this means %eax contains file->f_op, but %eax
> is 0x4c4d374c and kernel space starts at 0xc0000000
> (in your case) so the address is bogous ...
>
> but, 0xc = 0x4 + 0x8 so a single bit failure might
> be enough to make this a valid address ...
> OTOH, 0x4c = L, 0x4d = M and 0x37 = 7 ;)
>
> best,
> Herbert
Right.
Now this hardware has ECC on RAM and CPU caches, which
should be able to correct 1 bit errors and detects more
severe ones.
After looking trough IPMI logs I did not find any ECC or CPU
errors, nor ECC error corrections.
I guess its one of the xeons itself, probably a ramification of
a power supply that died a year ago.
Thanks, very much.
--
lg, Chris
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