[ ssic-linux-Bugs-1969647 ] NULL pointer dereference in proc_task_lookup

Bugs item #1969647, was opened at 2008-05-22 16:40
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Category: Process Management
Group: v1.9.3
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: NULL pointer dereference in proc_task_lookup

Initial Comment:
I see this one quite often.  Don't know how to reproduce at the moment:

Unable to handle kernel NULL pointer dereference at virtual address 00000008
 printing eip:
c01ab456
*pde = 00000000
Oops: 0002 [#2]
SMP
Modules linked in: iptable_filter ipt_state iptable_nat ip_conntrack ip_tables ppdev parport_pc lp parport button ac battery floppy pcspkr e100 mii i2c_i801 i2c_core ehci_hcd uhci_hcd shpchp kqemu ext3 jbd sr_mod sd_mod mptsas mptscsih mptbase scsi_mod tg3 e1000
CPU:    0
EIP:    0060:[<c01ab456>]    Not tainted VLI
EFLAGS: 00010246   (2.6.11-jh-2)
EIP is at proc_task_lookup+0xf6/0x210
eax: 00000000   ebx: 00000000   ecx: f6bc4600   edx: dffff840
esi: f6bc4678   edi: f6bc4600   ebp: dbc87e10   esp: dbc87dd8
ds: 007b   es: 007b   ss: 0068
Process find (pid: 116733, threadinfo=dbc87000 task=d2c88270)
Stack: f6bc4600 00000000 00000000 00000000 00000000 00000000 dbc87e00 dbc87000
       c266cc00 00076a88 f7118f64 fffffff4 c5a023a4 c5a0241c dbc87e34 c017dd65
       c5a023a4 e24b2ab0 dbc87f10 e24b2ab0 00000000 dbc87f10 dfdeb580 dbc87e54
Call Trace:
 [<c010681f>] show_stack+0x7f/0xa0
 [<c01069c4>] show_registers+0x164/0x230
 [<c0106d74>] die+0xf4/0x1c0
 [<c011f40d>] do_page_fault+0x49d/0x699
 [<c0106483>] error_code+0x2b/0x30
 [<c017dd65>] real_lookup+0xe5/0x120
 [<c017e13c>] do_lookup+0x8c/0xa0
 [<c017e8ce>] link_path_walk+0x77e/0xde0
 [<c017f211>] path_lookup+0xa1/0x1c0
 [<c017f4df>] __user_walk+0x3f/0x90
 [<c0178e9b>] vfs_lstat+0x1b/0x60
 [<c0179619>] sys_lstat64+0x19/0x40
 [<c010591b>] syscall_call+0x7/0xb
Code: c0 89 44 24 08 31 c0 89 54 24 14 89 44 24 04 e8 a1 90 08 00 85 c0 75 0b 8b 55 e8 8b 45 f0 39 42 04 74 32 89 3c 24 e8 8a 7e 09 00 <f0> ff 4b 08 0f 94 c0 84 c0 75 0f b8 fe ff ff ff 83 c4 2c 5b 5e

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