Date: Mon, 28 Apr 2008 00:46:19 -0700 From: Xin LI <delphij@delphij.net> To: Peter Holm <peter@holm.cc> Cc: freebsd-fs@freebsd.org, kib@freebsd.org, Jeff Roberson <jeff@freebsd.org>, d@delphij.net Subject: Re: [7.0-R] Possible ufs livelock during coredump path? Message-ID: <481580CB.1000800@delphij.net> In-Reply-To: <64011.193.234.247.50.1209366028.squirrel@webmail3.pair.com> References: <4815620F.3090005@delphij.net> <64011.193.234.247.50.1209366028.squirrel@webmail3.pair.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Peter Holm wrote: | Hi, | | It seems that we have a potential livelock during coredump on 7.0-R, the | case was that two processes trying to coredump in the same time (e.g. if | I configure kern.corefile=/var/tmp/%N.core and a lot of instances | coredump in the same time), perhaps when paging involved with it. Upon | reboot, it would not recover but wait infinitely. The box is running | 7.0-R/i386, UP (Origin = "GenuineIntel" Id = 0xf34 Stepping = 4). | | Is this an known issue? This is my own server but I do not have my | hands on it because it is in China, however I can provide some help if | the experiment can be recovered with a power-cycle :) | | |> AFAIK it is an old problem. I have some test where I had to disable core |> dumps for the same reason. I seem to remember that the problem is related |> to running out of VM? For my case it does not seem to be ran out of VM (at least the system did not printed out any messages, the log has a lot of kernel: pid 27223 (httpd), uid 80: exited on signal 11 (core dumped) but not the out of swap one. So, presumably we can reliably trigger this situation (or at least your ones :)? Cheers, - -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkgVgMsACgkQi+vbBBjt66BnOwCeJLB5xoE27b3CN/x/VIL+0EAI +c8AoJyYiqCi7tBeqZBx6cj/+gzBLmFn =qZmb -----END PGP SIGNATURE-----
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