ZFS-NFS kernel panic under load

[Pawel Jakub Dawidek]

On Thu, Aug 21, 2008 at 03:35:04PM -0400, Weldon S Godfrey 3 wrote:
> 
> Looks like the bug with NFS and ZFS still exists.
> 
> Well, I got the lastest 8-HEAD on with the most recent ZFS patch and ran 
> the benchmarks again this morning and after about an hour, it paniced with 
> the same message about page fault with nfsd.  It dropped to debugger on 
> shutdown, it didn't do a savecore, dumpdev is set to AUTO.
> 
> I will be more than happy to provide anything to assist in debugging it.
[...]
> (kgdb) backtrace
> #0  doadump () at pcpu.h:194
> #1  0x0000000000000004 in ?? ()
> #2  0xffffffff804a7049 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
> #3  0xffffffff804a744d in panic (fmt=0x104 <Address 0x104 out of bounds>) at /usr/src/sys/kern/kern_shutdown.c:572
> #4  0xffffffff807780e4 in trap_fatal (frame=0xffffff000bce26c0, eva=18446742974395967712) at /usr/src/sys/amd64/amd64/trap.c:724
> #5  0xffffffff807784b5 in trap_pfault (frame=0xffffffffdfbc5670, usermode=0) at /usr/src/sys/amd64/amd64/trap.c:641
> #6  0xffffffff80778de8 in trap (frame=0xffffffffdfbc5670) at /usr/src/sys/amd64/amd64/trap.c:410
> #7  0xffffffff8075e7ce in calltrap () at /usr/src/sys/amd64/amd64/exception.S:169
> #8  0xffffffff8063b3d8 in nfsrv_access (vp=0xffffff00207d7dc8, flags=128, cred=0xffffff00403d4800, rdonly=0, td=0xffffff000bce26c0, override=0) at /usr/src/sys/nfsserver/nfs_serv.c:4284
> #9  0xffffffff8063c4f1 in nfsrv3_access (nfsd=0xffffff00543ed000, slp=0xffffff0006396d00, td=0xffffff000bce26c0, mrq=0xffffffffdfbc5af0) at /usr/src/sys/nfsserver/nfs_serv.c:234
> #10 0xffffffff8064cd1d in nfssvc (td=Variable "td" is not available.) at /usr/src/sys/nfsserver/nfs_syscalls.c:456
> #11 0xffffffff80778737 in syscall (frame=0xffffffffdfbc5c70) at /usr/src/sys/amd64/amd64/trap.c:852
> #12 0xffffffff8075e9db in Xfast_syscall () at /usr/src/sys/amd64/amd64/exception.S:290

Can you tell me how exactly line 4284 of sys/nfsserver/nfs_serv.c looks
in your source?

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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