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Date: Wed, 31 Oct 2012 13:15:17 +0100 From: Jan Kara <jack@...e.cz> To: Nikola Ciprich <nikola.ciprich@...uxbox.cz> Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: BUG: enabling psacct breaks fsfreeze Hello, On Tue 23-10-12 11:43:51, Nikola Ciprich wrote: > while trying to create consistent backups of KVM guest, I've discovered > that fsfreeze always hangs.. deeper investigation revealed psacct to be the culprit. > When psacct is disabled, fsfreeze works fine, when enabled, the command never returns. > I suppose that the problem is /var is not on separate partition (ie it's same volume > as /) and psacct isn't able to dump process exit information about fsfreeze command > thus creating deadlock.. > problem is 100% reproducible on both latest 3.0.x kernel and 3.7-r1c. > > Should more debugging information be needed, I'll be glad to provide whatever I can.. Thanks for report. Hum, I'm not sure how the deadlock can happen because AFAIU audit sends a message via netlink to userspace and whatever audit daemon does with it is its private thing. Can you please run: echo w >/proc/sysrq-trigger after the machine deadlocks and then take dmesg and attach it here? You'll have to have the shell prepared and use serial console / netconsole to gather dmesg or try your luck with copying via ssh / netcat. Honza -- Jan Kara <jack@...e.cz> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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