Date: Tue, 03 May 2011 22:59:14 -0700 From: Kirk McKusick <mckusick@mckusick.com> To: Garrett Cooper <yanegomi@gmail.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Nasty non-recursive lockmgr panic on softdep only enabled UFS partition when filesystem full Message-ID: <201105040559.p445xEJ5024585@chez.mckusick.com> In-Reply-To: <BANLkTik4=O_1PWB2GzGzY=m51dG-Kbhe%2BQ@mail.gmail.com>
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> Date: Tue, 3 May 2011 22:40:26 -0700
> Subject: Nasty non-recursive lockmgr panic on softdep only enabled UFS
> partition when filesystem full
> From: Garrett Cooper <yanegomi@gmail.com>
> To: Jeff Roberson <jeff@freebsd.org>,
> Marshall Kirk McKusick <mckusick@mckusick.com>
> Cc: FreeBSD Current <freebsd-current@freebsd.org>
>
> Hi Jeff and Dr. McKusick,
> Ran into this panic when /usr ran out of space doing a make
> universe on amd64/r221219 (it took ~15 minutes for the panic to occur
> after the filesystem ran out of space -- wasn't quite sure what it was
> doing at the time):
>
> ...
>
> Let me know what other commands you would like for me to run in kgdb.
> Thanks,
> -Garrett
You did not indicate whether you are running an 8.X system or a 9-current
system. It would be helpful to know that.
Jeff thinks that there may be a potential race in the locking code for
softdep_request_cleanup. If so, this patch for 9-current should fix it:
Index: ffs_softdep.c
===================================================================
--- ffs_softdep.c (revision 221385)
+++ ffs_softdep.c (working copy)
@@ -11380,7 +11380,8 @@
continue;
}
MNT_IUNLOCK(mp);
- if (vget(lvp, LK_EXCLUSIVE | LK_INTERLOCK, curthread)) {
+ if (vget(lvp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK,
+ curthread)) {
MNT_ILOCK(mp);
continue;
}
If you are running an 8.X system, hopefully you will be able to apply it.
Kirk McKusick
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