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Date: Sat, 29 Sep 2007 06:14:02 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Krzysztof Oledzki <olel@....pl> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Strange system hangs On Friday 28 September 2007 18:42, Krzysztof Oledzki wrote: > Hello, > > I am experiencing weird system hangs. Once about 2-5 weeks system freezes > and stops accepting remote connections, so it is no longer possible to > connect to most important services: smtp (postfix), www (squid) or even > ssh. Such connection is accepted but then it hangs. > > What is strange, that previously established ssh session is usable. It is > possible to work on such system until you do something stupid like "less > /var/log/all.log". Using strace I found that process blocks on: Is this a regression? If so, what's the most recent kernel that didn't show the problem? The symptoms could be consistent with some place doing a balance_dirty_pages while holding a lock that is required for IO, but I can't see a smoking gun (you've got contention on i_mutex, but that should be OK). Can you see if there is any memory under writeback that isn't being completed (sysrq+M), also a list the locks held after the hang might be helpful (compile in lockdep and sysrq+D) Is anything currently running? (sysrq+P and even a full sysrq+T task list could be useful). Are any IO errors occurring at all? Thanks, Nick - 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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