Date: Fri, 20 Nov 1998 16:16:57 -0800 (PST) From: "Steven G. Kargl" <kargl@troutmask.apl.washington.edu> To: dg@root.com Cc: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/8750 Message-ID: <199811210016.QAA00451@troutmask.apl.washington.edu> In-Reply-To: <199811190017.QAA13701@root.com> from David Greenman at "Nov 18, 1998 4:17:18 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
According to David Greenman:
> >According to David Greenman:
> >> Synopsis: SMP kernel panics and wipes out filesystems
> >>
> >> State-Changed-From-To: open-closed
> >> State-Changed-By: dg
> >> State-Changed-When: Wed Nov 18 16:04:22 PST 1998
> >> State-Changed-Why:
> >> The bug was fixed by Kirk McKusick on the 17th. rev 1.74 of vfs_cluster.c.
> >>
> >
> >Are you sure? (Yes, I know I shouldn't doubt you and Kirk). I
> >saw Kirk's commit, and cvsup'd new sources. My system would
> >still panic. However, my filesystems had been toasted, so perhaps, I
> >had a corrupt /usr/src tree.
> >
> >Thanks for the quick response. I'm cvsup'ing new sources, now.
>
> The cause was fairly well understood and others confirmed that the bug
> was fixed.
3 more crashes. I had rev 1.74 of vfs_cluster.c compiled into the
kernel. The first dropped me into the debugger:
dev=0x20404, bno = 6, bsize = 8192, size = 8192, fs = /var
panic: ffs_blkfree: bad size
mp_lock = 00000001; cpuid = 0; lapic.id = 01000000
Debugger("panic")
Stopped at _Debugger+0x35: movb $0, _in_Debugger.98
db> trace
_Debugger() at _Debugger+0x35
_panic() at _panic+0x9f
_ffs_blkfree() at _ffs_blkfree+0xc2
_ffs_reallocblks() at _ffs_reallocblks+0x420
_cluster_write() at _cluster_write+0x15f
_ffs_write() at _ffs_write+0x56f
_vn_write() at _vn_write+0xef
_write() at _write+0xba
_syscall() at _syscall+0x187
_Xint0x80_syscall() at _Xint0x80_syscall+0x4c
rm -rf /usr/src
cvsup'd /usr/src on 19 Nov 98 at 0915.
The next two crashed occurred while running X11R6, and the system
froze. I could not break into the debugger.
This is an SMP system with 2 processors. Is there a possible
race condition due to SMP that Kirk's patch missed?
troutmask:kargl[201] mount -v
/dev/da0s1a on / (local, writes: sync 47 async 466)
/dev/da1s1e on /ftp (local, writes: sync 2 async 0)
/dev/da0s1g on /home (NFS exported, local, writes: sync 77 async 284)
/dev/da0s1f on /usr (NFS exported, local, writes: sync 7 async 220)
/dev/da0s1e on /var (local, writes: sync 209 async 496)
procfs on /proc (local)
--
Steve
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199811210016.QAA00451>