kern/177536: [zfs] zfs livelock (deadlock) with high write-to-disk load

[Xin Li]

The following reply was made to PR kern/177536; it has been noted by GNATS.

From: Xin Li <delphij at delphij.net>
To: bug-followup at FreeBSD.org, Martin.Birgmeier at 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-----