Date: Thu, 15 Aug 2013 05:40:01 GMT From: Xin Li <delphij@delphij.net> To: freebsd-fs@FreeBSD.org Subject: Re: kern/177536: [zfs] zfs livelock (deadlock) with high write-to-disk load Message-ID: <201308150540.r7F5e1f4008841@freefall.freebsd.org>
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The following reply was made to PR kern/177536; it has been noted by GNATS. From: Xin Li <delphij@delphij.net> To: bug-followup@FreeBSD.org, Martin.Birgmeier@aon.at Cc: Subject: Re: kern/177536: [zfs] zfs livelock (deadlock) with high write-to-disk load Date: Wed, 14 Aug 2013 22:37:22 -0700 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I can't say for sure based on the information you have provided, but stable/9 have a lot of fixes that could be related. One problem we found in field that is not easy to reproduce is that there is a lost interrupt issue in FreeBSD core. This was fixed in r253184 (post-9.1-RELEASE and before 9.2, the fix will be part of the upcoming FreeBSD 9.2-RELEASE): http://svnweb.freebsd.org/base/stable/9/sys/kern/kern_intr.c?r1=249402&r2=253184&view=patch The symptom of this issue is that you basically see a lot of processes blocking on zio->zio_cv, while there is no disk activity. However, the information you have provided can neither prove or deny my guess. I post the information here so people are aware of this issue if they search these terms. Cheers, -----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJSDGkSAAoJEG80Jeu8UPuzrBwH/01K+aR4WVN6SfK8i9WpjxhW nhv0dWP/Q6+XStmNJcthNfT3Ox2lR+yNYhPif3uUtOYGjlEZX/t9QpptXo86Xwji kN7cPZwELqE+0FS10uWtlaOYexqD7eg2QK2oj75hTfcKr5XfJWEVgWxlj+Iv6eAI 6JkNd7mdvOJReAgHVyt6mMdR/p4xhDP+/3lJXg1YoINYVfWzpolLAZcxdPxAxF+O 4rYM+BA/pcpglbK7CFd59tIUOeUaeOPHPVBeqw1NvMHw2EfJANx8PSyiu2jWdSeQ 264XgS3ZuphVWFYuapt2nQdkLaBFCQyfCU/3hu1lNQjD+6iwWoKIwtae32kmN+0= =cwdX -----END PGP SIGNATURE-----
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