Date: Mon, 23 Apr 2007 09:59:07 -0400 From: Adam McDougall <mcdouga9@egr.msu.edu> To: Kai <kai@xs4all.nl> Cc: stable@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode Message-ID: <20070423135907.GN55098@egr.msu.edu> In-Reply-To: <20070419123329.GA10189@xs4all.nl> References: <20070411105332.GC7847@xs4all.nl> <20070419123329.GA10189@xs4all.nl>
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On Thu, Apr 19, 2007 at 02:33:29PM +0200, Kai wrote:
On Wed, Apr 11, 2007 at 12:53:32PM +0200, Kai wrote:
>
> Hello all,
>
> We're running into regular panics on our webserver after upgrading
> from 4.x to 6.2-stable:
Hi Again,
The panics keep happening, so I'm trying alternate kernel setups. This is a
trace of a panic on a default SMP kernel with debugging symbols.
<snip>
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x34
^^^^^^^^^
fault code = supervisor read, page not present
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#7 0xc06bdefa in vfs_vmio_release (bp=0xdbec2560) at atomic.h:146
^^^^^^^^^^^^^^^^
#8 0xc06be728 in getnewbuf (slpflag=0, slptimeo=0, size=6585, maxsize=8192)
at ../../../kern/vfs_bio.c:1779
#9 0xc06bfccc in getblk (vp=0xca2cfdd0, blkno=8438, size=6585, slpflag=0,
slptimeo=0, flags=0) at ../../../kern/vfs_bio.c:2497
#10 0xc075ad41 in nfs_getcacheblk (vp=0xca2cfdd0, bn=8438, size=6585,
td=0xc8cd1c00) at ../../../nfsclient/nfs_bio.c:1261
#11 0xc075a978 in nfs_write (ap=0x0) at ../../../nfsclient/nfs_bio.c:1069
#12 0xc089fde6 in VOP_WRITE_APV (vop=0xc0984440, a=0xeb9cfbec)
at vnode_if.c:698
#13 0xc06dbb26 in vn_write (fp=0xc8940e10, uio=0xeb9cfcbc,
active_cred=0xc89ee880, flags=0, td=0xc8cd1c00) at vnode_if.h:372
#14 0xc0698f63 in dofilewrite (td=0xc8cd1c00, fd=5, fp=0xc8940e10,
auio=0xeb9cfcbc, offset=Unhandled dwarf expression opcode 0x93
) at file.h:252
#15 0xc0698e07 in kern_writev (td=0xc8cd1c00, fd=5, auio=0xeb9cfcbc)
at ../../../kern/sys_generic.c:402
#16 0xc0698d2d in write (td=0xc8cd1c00, uap=0xc8cd1c00)
at ../../../kern/sys_generic.c:326
I believe I am seeing the same panic on my samba servers, sometimes from NFS
and sometimes from FFS. I see it on i386 and amd64 alike. I do not know how
to manually trigger it, but I do have two servers sitting in DDB from after the
panic, waiting for more experienced hands to continue the debugging from what
I have already done. I filed a PR with as much details as I could think of,
and it would be wonderful if someone could look at it and either tell me what
else to do in DDB, or I could provide remote access to the existing DDB session
to a developer. Both servers crashed in vfs_vmio_release but one was through
NFS and one through FFS.
pr 111831
http://docs.freebsd.org/cgi/mid.cgi?200704181924.l3IJOMUL088901
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