Messages in this thread | | | Date | Fri, 07 Oct 2005 20:38:05 +0400 | From | Michael Tokarev <> | Subject | Re: kernel freeze (not even an OOPS) on remount-ro+umount when using quotas |
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Steven Rostedt wrote: > On Fri, 7 Oct 2005, Michael Tokarev wrote: > > >>This is something that has biten me quite successefully >>in last few days... ;) >> >>To make a long story short: >> >> # mke2fs -j /dev/hda6 >> # mount -o usrquota /dev/hda6 /mnt >> # cp -a /home /mnt # to make some files to work with >> # quotacheck -uc /mnt >> # quotaon /mnt
Looks like it's more reproduceable when there's some writing going on at this point - after enabling the quotas and before remointing it read-only. Maybe there's some unwritten quota data left in memory at the remount, or something like that...
>> # mount -o remount,ro # this is the important step! >> # ls -l /mnt /mnt/home # to do "something" (also important) >> # umount /mnt >> >>At this time (attempting to umount the read-only filesystem with quotas >>enabled), the machine freezes without any messages on the console. No >>OOPS, no response, no nothing - until a hard reboot (powercycle). >> >>This happens on 2.6.11, 2.6.12 and 2.6.13 kernels -- ie, with "current" >>kernel release. > > I just tried this on 2.6.13.1 and was not able to reproduce your hangup.
I'm able to reproduce it on almost any my machine. Tried on several production machines first ;) And on at least two test machines. Now I'm at home and my home PC also shows this bug (2.6.13.1 vanilla).
> Have you tried turning on the nmi watchdog with "nmi_watchdog=2 lapic"?
nmi_watchdog makes no visible difference. Lapic is already enabled, at least on this machine (BTW, the same behaviour happens on SMP and UP machines, with and without hyperthreading enabled).
> If this blocks interrupts while it spins, you might be able to see what's > happening. Also if interrupts are not blocked, try out sysrq-t and > friends.
And hee-hoo, sysrq works! Strange I haven't noticied it before - I think I tried it on the laptop, maybe I pressed some wrong button...
Now, as I don't have another PC here @home, only this machine and an ADSL router (small mips-based device wich is also running linux), and I will not have access to another machine(s) till monday... I'll try netconsole to the router. Damn, why ShiftPgUp does not work as it worked in 2.4?? :(
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