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Date: Wed, 25 Aug 2010 00:20:30 +0200
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Subject: Automount causes zero-pointer dereference in 2.6.36-rc2
From: "Christopher K." <c.krooss@googlemail.com>
To: linux-kernel@vger.kernel.org
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Hi,
I'm using autofs to mount some cifs shares in my /home.
Running 2.6.36-rc2-git2, browsing /home results in the following error:

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c124a921>] strncmp+0x11/0x30
*pde = 00000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/virtual/bdi/cifs-5/uevent
Modules linked in:
Pid: 3496, comm: mount.cifs Not tainted 2.6.36-rc2-git2 #2 K50IJ
EIP: 0060:[<c124921>] EFLAGS: 00010216 CPU: 1
EIP is at strncmp+0x11/0x30
EAX: 00000000 EBX: f3a5d200 ECX: 000001ff EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: f3a98408 ESP: f3acde38
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process mount.cifs (pid: 3496, ti=f3acc000, task=f5adc800, task.ti=f3acc000)
Stack:
 f3a98400f5a24080 c119f122 00000000 00000000 00000000 00000000 00000000
<0> 00003674 00000000 00000000 f3a7f02e f5a24080 c17d4320 f5a837c0 c119f784
<0> c15c4280 f3acdea0 00000000 f3b2ae30 f3acdea4 f3b2ae00 00003673 f3b2ae30
Call Trace:
...cifs_get_smb_ses...
...cifs_mount...
...kmem_cache_alloc...
...cifs_get_sb...
...vfs_kern_mount...
...get_fs_type...
...do_kern_mount...
...do_mount...
...copy_mount_options...
...sys_mount...
...sysenter_do_call...

I believe it's kernel-related, as it does not occur in <= 2.6.35.2
Should I recompile my kernel to enable some more debugging-information?
Christopher
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