seeing crash on running ltp proc01

[madhuri appana]

Hi All,

I am seeing crash on running ltp proc01 syscall on kvm guest using
latest qemu1.0 rc0 and latest linus kernel.

Here is the crash report:

[  256.805661] The scan_unevictable_pages sysctl/node-interface has been
disabled for lack of a legitimate use case.  If you have one, please
send an email to linux-mm@xxxxxxxxxx
[  256.820968] process `proc01' is using deprecated sysctl (syscall)
net.ipv6.neigh.default.retrans_time; Use
net.ipv6.neigh.default.retrans_time_ms instead.
[  837.127321] BUG: unable to handle kernel NULL pointer dereference at
0000000000000010
[  837.127980] IP: [<ffffffff8157690c>] dev_from_new_bucket+0xb/0x79
[  837.128053] PGD 3a89d067 PUD 3ad09067 PMD 0 
[  837.128053] Oops: 0000 [#1] SMP 
[  837.128053] CPU 2 
[  837.128053] Modules linked in:
[  837.128053] 
[  837.128053] Pid: 9933, comm: proc01 Not tainted 3.1.0+ #3 Bochs Bochs
[  837.128053] RIP: 0010:[<ffffffff8157690c>]  [<ffffffff8157690c>]
dev_from_new_bucket+0xb/0x79
[  837.128053] RSP: 0018:ffff880039885e18  EFLAGS: 00010246
[  837.128053] RAX: ffffffff818df330 RBX: 0000000000000400 RCX:
0000000000000000
[  837.128053] RDX: ffff880039885e70 RSI: 0000000000000000 RDI:
ffff88003c427600
[  837.128053] RBP: ffff880039885e18 R08: 0000000000000010 R09:
ffff88003c427600
[  837.128053] R10: ffffffff81c1f610 R11: ffffffff81576fa2 R12:
ffff88003a4e6140
[  837.128053] R13: ffff88003c427600 R14: 0000000000000001 R15:
0000000000000000
[  837.128053] FS:  00007f0c56deb7c0(0000) GS:ffff88003f100000(0000)
knlGS:0000000000000000
[  837.128053] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  837.128053] CR2: 0000000000000010 CR3: 00000000398a4000 CR4:
00000000000006e0
[  837.128053] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  837.128053] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[  837.128053] Process proc01 (pid: 9933, threadinfo ffff880039884000,
task ffff88003a91e6d0)
[  837.128053] Stack:
[  837.128053]  ffff880039885e28 ffffffff815769db ffff880039885ea8
ffffffff8111f614
[  837.128053]  0000000000000000 ffff880039885e70 ffff88003c427638
0000000000000246
[  837.128053]  ffff880039885f58 00000000006243a0 ffffffff8111f463
0000000000000001
[  837.128053] Call Trace:
[  837.128053]  [<ffffffff815769db>] dev_seq_next+0x61/0x63
[  837.128053]  [<ffffffff8111f614>] seq_read+0x1b1/0x369
[  837.128053]  [<ffffffff8111f463>] ? seq_lseek+0xd4/0xd4
[  837.128053]  [<ffffffff8111f463>] ? seq_lseek+0xd4/0xd4
[  837.128053]  [<ffffffff81150a5c>] proc_reg_read+0x90/0xaf
[  837.128053]  [<ffffffff8110519c>] vfs_read+0xa2/0xde
[  837.128053]  [<ffffffff81099ec1>] ? trace_hardirqs_on_caller
+0x11e/0x155
[  837.128053]  [<ffffffff81105291>] sys_read+0x45/0x6c
[  837.128053]  [<ffffffff81685bbb>] system_call_fastpath+0x16/0x1b
[  837.128053] Code: 42 08 c9 c3 55 83 ff 27 b8 ea ff ff ff 48 89 e5 77
0c 89 ff 31 c0 48 89 34 fd 00 8e 63 82 c9 c3 4c 8b 87 d0 00 00 00 55 48
89 e5 
[  837.128053]  8b 10 c1 ea 18 4c 8b 8f d0 00 00 00 31 c9 41 8b 01 89 c6
41 
[  837.128053] RIP  [<ffffffff8157690c>] dev_from_new_bucket+0xb/0x79
[  837.128053]  RSP <ffff880039885e18>
[  837.128053] CR2: 0000000000000010
[  837.148037] ---[ end trace 9639850acd813c5b ]---
[root@qemu-img-64 bin]

Thanks,
Madhuri

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