Re: panic in vfs_lookup/kern_statat_vnhook?

On Tuesday, May 22, 2012 2:36:06 pm Ian FREISLICH wrote:
> Hi
> 
> I've had quite a few reproduceable panics that look to be VFS
> related.  The trigger is relatively heavy concurrent disk IO.
> I can trigger it easily two ways:
> 
> 1. running my backup script which essentially does:
> 	cd /; rsync --one-file-system --delete -aHv . /backup
> 	cd /tmp; rsync --one-file-system --delete -aHv . /backup/tmp
> 	cd /usr; rsync --one-file-system --delete -aHv . /backup/usr
> 	cd /var; rsync --one-file-system --delete -aHv . /backup/var
> 
> 2. While updating with cvsup or csup, launch firefox.
> 
> Both reliably provoke the panic:
> 
> #0  doadump (textdump=1) at pcpu.h:244
> #1  0xc06aa895 in kern_reboot (howto=260)
>     at /usr/src/sys/kern/kern_shutdown.c:454
> #2  0xc06aad36 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:642
> #3  0xc087adee in trap_fatal (frame=0xedb365c8, eva=28)
>     at /usr/src/sys/i386/i386/trap.c:1022
> #4  0xc087aed8 in trap_pfault (frame=0xedb365c8, usermode=0, eva=28)
>     at /usr/src/sys/i386/i386/trap.c:875
> #5  0xc087bc4d in trap (frame=0xedb365c8) at /usr/src/sys/i386/i386/trap.c:546
> #6  0xc086687c in calltrap () at /usr/src/sys/i386/i386/exception.s:169
> #7  0xc0878682 in pmap_enter (pmap=0xc09e4060, va=3359633408, access=7 '\a', 
>     m=0xc3073f70, prot=7 '\a', wired=1) at /usr/src/sys/i386/i386/pmap.c:1596

This is the actual panic.  Can you go to this frame?  The VFS bits don't
matter, the pmap code blew up trying to malloc another vnode.

> This same panic was reported some time back in:
> 	Subject: [panic] zfs_zget() panic during 'svn update'
> 	From: Glen Barber <gjb_at_FreeBSD.org>
> 	Date: Thu, 17 May 2012 16:18:51 -0400
> 	To: freebsd-current_at_FreeBSD.org
> 	
> 	http://people.freebsd.org/~gjb/zfs_zget-panic.kgdb.txt

This is a completely different and (AFAICT) unrelated panic.

-- 
John Baldwin