Messages in this thread |  | | | Date | Fri, 7 Oct 2005 10:21:17 -0400 (EDT) | | From | Steven Rostedt <> | | Subject | Re: kernel freeze (not even an OOPS) on remount-ro+umount when using quotas |
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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 > # 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. Have you tried turning on the nmi watchdog with "nmi_watchdog=2 lapic"?
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.
-- Steve
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