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SubjectXFS problems (hard lockup and oops on startup) with 2.5.5{6,7}
Hello,

The kernel 2.5.56 seems to have changed something that affected the XFS
code as I'm getting hit by one (and possibly two) bugs related to it now.
What happens is that the machine suddenly freezes (running Debian/Sid -
XFree 4.2.1, glibc 2.3.1, gnome2 - nothing out of ordinary) so that SysRq
keys don't have any effect (but Numlock still toggles the led on the
keyboard), machine is inaccessible from the net and the only cure is hard
reboot. Nothing gets logged on the freeze and on reboot when XFS attempts to
check the first filesystem the kernel oopses with Oops code 0002, in the
interrupt handler. Nothing gets logged, of course, so I can't provide the
full backtrace right now - I'll try to get it logged through the serial console
if it happens again with 2.5.58. I have copied some values by hand from the
screen (until I lost patience... :)):

Unable to handle kernel paging request at virtual address 000500074
printing EIP

C0138652
*PDE: 00000000
Oops: 0002
EIP: 0060:[<c0138662>]
EFLAGS: 00010016
EAX: 00050070 EBE: EFBB8000 ECX: EFBB8040 EDX: 0A000000
ESI: EFFEFE50 EDI: 00000000 EBP: EFFEFE5C ESP: C0403ECC
DS: 007B ES: 007B SS: 0069

Process: swapper (PID: 0, threadinfo=C0402000 TASK: C03DBC00)

The only way to get back to 2.5.5{6,7} is
to reboot to 2.5.55 or earlier whose XFS is able to recover the filesystem
and then go back to .5{6,7}. My machine config is attached. Is anyone else
observing such behavior?

TIA,

marek
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