Messages in this thread | | | From | Nick Piggin <> | Subject | Re: Strange system hangs | Date | Sat, 29 Sep 2007 06:14:02 +1000 |
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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?
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