Date: Wed, 23 May 2012 06:28:53 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: panic in vfs_lookup/kern_statat_vnhook? Message-ID: <E1SX3Bt-0000qb-JF@clue.co.za> In-Reply-To: <201205221641.13091.jhb@freebsd.org> References: <201205221641.13091.jhb@freebsd.org> <E1SWtwE-0000Ru-Eu@clue.co.za>
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John Baldwin wrote:
> 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:15
96
>
> 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.
(kgdb) frame 7
#7 0xc0878682 in pmap_enter (pmap=0xc09e4060, va=3359633408, access=7 '\a',
m=0xc191bf70, prot=7 '\a', wired=1) at /usr/src/sys/i386/i386/pmap.c:1596
1596 root = vm_page_splay(mpte->pindex, root);
(kgdb) l
1591 root = pmap->pm_root;
1592 if (root == NULL) {
1593 mpte->left = NULL;
1594 mpte->right = NULL;
1595 } else {
1596 root = vm_page_splay(mpte->pindex, root);
1597 if (mpte->pindex < root->pindex) {
1598 mpte->left = root->left;
1599 mpte->right = root;
1600 root->left = NULL;
Ian
--
Ian Freislich
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