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Subject[Bug 452] New: Null pointer dereference in find_inode_fast

Summary: Null pointer dereference in iget_locked
Kernel Version: 2.5.64
Status: NEW
Severity: normal

Distribution: heavily modified RedHat 7.2
Hardware Environment: Athlon Thunderbird 1.0GHz, (2) WD1600JB
Software Environment: 2.5.64 kernel, LVM2 on top of MD RAID-1
Problem Description: Null pointer dereference in iget_locked

Mar 8 08:09:18 jeeves kernel: Unable to handle kernel NULL pointer dereference
at virtual address 00000000
printing eip:
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0060:[<c0152ddc>] Not tainted
EFLAGS: 00010286
EIP is at find_inode_fast+0x1c/0x40
eax: 00000000 ebx: 00cb55d8 ecx: 00000000 edx: c53616a0
esi: cfd21000 edi: 00cb55d8 ebp: cfd21000 esp: c6cdbd88
ds: 007b es: 007b ss: 0068
Process make (pid: 11518, threadinfo=c6cda000 task=c3892680)
Stack: 00000000 c12a98b4 c0153209 cfd21000 c12a98b4 00cb55d8 00cb55d8 00000000
c17b4af8 00000000 00000000 00000000 00000000 00000000 00000000 c17b4af8
00cb55d8 00000000 c01ac7c4 cfd21000 00cb55d8 00000000 00000000 00000000
Call Trace:
[<c0153209>] iget_locked+0x39/0x80
[<c01ac7c4>] xfs_iget+0x34/0x120
[<c01c16b6>] xfs_dir_lookup_int+0x56/0xc0
[<c01c52cd>] xfs_lookup+0x3d/0x70
[<c01cf18f>] linvfs_lookup+0x3f/0x80
[<c014988d>] real_lookup+0x4d/0xc0
[<c0149ada>] do_lookup+0x4a/0x90
[<c01cf5a0>] linvfs_permission+0x0/0x20
[<c014a00e>] link_path_walk+0x4ee/0x7b0
[<c01cc0bd>] linvfs_readdir+0x1bd/0x1d0
[<c01495dd>] getname+0x5d/0xa0
[<c014a664>] __user_walk+0x24/0x40
[<c0146617>] vfs_stat+0x17/0x50
[<c0146bc0>] sys_stat64+0x10/0x30
[<c0130000>] s_show+0x150/0x1c0
[<c010a5b3>] syscall_call+0x7/0xb

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