linux-kernel - Re: Null pointer in autofs4 (_spin

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Date:	Sun, 11 Mar 2007 22:29:04 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Ian Kent <raven@...maw.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Null pointer in autofs4 (_spin_lock) in 2.6.21-rc2

On Thu, 2007-03-08 at 19:39 +0900, Ian Kent wrote:
> On Thu, 2007-03-08 at 11:12 +0100, Thomas Renninger wrote:
> > On Thu, 2007-03-08 at 01:28 -0800, Andrew Morton wrote:
> > > > On Thu, 08 Mar 2007 09:57:56 +0100 Thomas Renninger <trenn@...e.de> wrote:
> > > > I saw this happening several times on 2.6.21-rc2.
> > > > Tell me how I can help...
> > > > Some nfs partitions are mounted via nfs using autofs.
> > > > It takes some hours to run into this:
> > > > 
> > > > Unable to handle kernel NULL pointer dereference at 0000000000000008
> > > > RIP:
> > > >  [<ffffffff8025bada>] _spin_lock+0x0/0xf
> > > > PGD 1dde23067 PUD 1d3060067 PMD 0
> > > > Oops: 0002 [1] SMP
> > > > CPU 3
> > > > Modules linked in: autofs4 nfs lockd nfs_acl sunrpc asus_acpi af_packet
> > > > tg3 ipv6 button battery ac ext2 mbcache loop dm_mod floppy parport_pc lp
> > > > parport reiserfs pata_amd edd fan thermal sg processor sata_sil libata
> > > > amd74xx sd_mod scsi_mod ide_disk ide_core
> > > > Pid: 11373, comm: touch Not tainted 2.6.21-rc2-default #6
> > > > RIP: 0010:[<ffffffff8025bada>]  [<ffffffff8025bada>] _spin_lock+0x0/0xf
> > > > RSP: 0018:ffff8101c50a5a50  EFLAGS: 00010202
> > > > RAX: ffff8100eb8916f8 RBX: ffff81010007dcd8 RCX: ffff8100ea45b280
> > > > RDX: 0000000010e58c2e RSI: ffff810163bf9e50 RDI: 0000000000000008
> > > > RBP: ffff810163bf9e50 R08: ffff8101c50a4000 R09: ffff8101c50a5ea8
> > > > R10: ffff81010003fca8 R11: ffffffff802299ad R12: 0000000000000000
> > > > R13: ffff8100eb891680 R14: 0000000000000005 R15: ffff8101c50a5b48
> > > > FS:  00002b8ae744bf20(0000) GS:ffff81010016a7c0(0000)
> > > > knlGS:00000000b7bd88d0
> > > > CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > > > CR2: 0000000000000008 CR3: 00000001b925f000 CR4: 00000000000006e0
> > > > Process touch (pid: 11373, threadinfo ffff8101c50a4000, task
> > > > ffff8101b78bd100)
> > > > Stack:  ffffffff882d5f38 ffff8101c50a5ea8 ffff8100ec8df4b0
> > > > 00000000000000d0
> > > >  ffff8100eb8916f8 ffff810163bf9efc 10e58c2eea45b220 ffff8100ea45b220
> > > >  ffff810163bf9e50 ffff8100ea45b220 ffff8100ec8df4b0 ffff8100ec8df568
> > > > Call Trace:
> > > >  [<ffffffff882d5f38>] :autofs4:autofs4_lookup+0xcb/0x311
> > > >  [<ffffffff8020c0d8>] do_lookup+0xc4/0x1ae
> > > >  [<ffffffff802097be>] __link_path_walk+0x8ec/0xd9d
> > > >  [<ffffffff8824ca24>] :sunrpc:rpcauth_lookup_credcache+0x12e/0x24a
> > > >  [<ffffffff8020da3e>] link_path_walk+0x58/0xe0
> > > >  [<ffffffff80232d3f>] __strncpy_from_user+0x17/0x41
> > > >  [<ffffffff8020949b>] __link_path_walk+0x5c9/0xd9d
> > > >  [<ffffffff8020da3e>] link_path_walk+0x58/0xe0
> > > >  [<ffffffff80232d3f>] __strncpy_from_user+0x17/0x41
> > > >  [<ffffffff8020bea7>] do_path_lookup+0x1b6/0x217
> > > >  [<ffffffff80221512>] __path_lookup_intent_open+0x56/0x97
> > > >  [<ffffffff80218912>] open_namei+0xa9/0x64c
> > > >  [<ffffffff8025dc33>] do_page_fault+0x45e/0x7ad
> > > >  [<ffffffff802250eb>] do_filp_open+0x1c/0x38
> > > >  [<ffffffff80232d3f>] __strncpy_from_user+0x17/0x41
> > > >  [<ffffffff80217698>] do_sys_open+0x44/0xc1
> > > >  [<ffffffff8025511e>] system_call+0x7e/0x83
> > > > 
> > > > 
> > > > Code: f0 ff 0f 79 09 f3 90 83 3f 00 7e f9 eb f2 c3 f0 81 2f 00 00
> > > > RIP  [<ffffffff8025bada>] _spin_lock+0x0/0xf
> > > >  RSP <ffff8101c50a5a50>
> > > > CR2: 0000000000000008
> > > 
> > > I assume 2.6.20 is OK?
> > Can't say for sure, I expect yes.
> > Set up with 2.6.20 now and let it run for a day or two.
> > Maybe someone has worked in that area and has an idea meanwhile...
> 
> Do we have any idea on what was being opened here?
> Might be useful to see the autofs maps if possible.
I sent that stuff to Ian...

However, I couldn't run into that with 2.6.20 and also not with
*2.6.21-rc3* (yet). Maybe it already got fixed?
Machine still running, I'll report back if this should happen again.

Thanks,

     Thomas

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