Description of problem:
file/disk/raid subsystem lock up
I am not a kernel hacker: everything that needs disk access freezes, other apps
such as gkrellm function ok. sync or reboot freezes too. Didn't try magic SysReq
I have four SATA drives, root on Raid1, home on raid5 (all software RAID with 4
Version-Release number of selected component (if applicable):
stock Fedora 8 kernel; same with 188.8.131.52
build kernel with
nice -n 20 make -j12
(failed 2 out of 3 times; however, I remember building it a few times with -j4
with no problems)
Steps to Reproduce:
1. COre 2 Quad; 4 SATA drives WD; root on raid1 home on raid5 (partitions of all
2. build kernel with "nice -n 20 make -j12" on home (raid5)
3. failed 2/3.
Everything that needs disk freezes (it is bad; cleaning up the filesystems and
raid after this takes a lot of time)
No lock up
nothing in dmesg
What info do you need?
try running with the kernel-debug package installed for a while, and see if you
can repeat it with that. Maybe lockdep will pick up something. (it's a stab in
the dark, but with no other info, there's not much else to suggest).
also echo T >/proc/sysrq-trigger will dump the process state to the dmesg
buffer. It's quite large though, so it'll likely overflow, and as you can't
write to disk, syslogd is unlikely to help. Hmm, echo S > /proc/sysrq-trigger
might be worth a shot, depending on how locked up the VFS is.
If you can set up a serial console or netconsole, that may be a better solution
to get everything out. There's instructions for both at
Now tried -j4, and during 2nd step it started dumping strange characters to my
terminal till it probably failed.
Running memtest... so far looks ok
After a few tries I put a new filesystem on home and restored from backup -
files must have been already corrupt (causing the strange chars problem), now it
compiled with -j4.
I tried netconsole (just to see it works before I actually need it) - and there
is a problem. Dumping tasks with sysrq didn't work - so I did "dmesg -n 8",
retried, and it did dump a few tasks, but froze the machine (mouse cursor was
moving, I could move windows with the mouse, but keyboard was dead - forgot to
check capslock however)
I'll post some system info, but I'll think twice and prepare before I think of
reproducing it again with -j12 - it takes a lot of time to restore the system
afterwards and netconsole is only partially working.
Anything else I could do? (every reproducing would take 1-2 hours of restoring
Created attachment 304334 [details]
Created attachment 304335 [details]
Created attachment 304336 [details]
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