lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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/

Powered by blists - more mailing lists