linux-kernel - BUG: unable to handle kernel NULL pointer dereference at 000000a0

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Message-ID: <CAKFRV=NPtyEpdpyV+Q37_SSTbdRsNeA=ftZX8cLpNFbV51qFrw@mail.gmail.com>
Date:	Sat, 27 Aug 2011 13:58:17 -0700
From:	Justin Mattock <justinmattock@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: BUG: unable to handle kernel NULL pointer dereference at 000000a0

running the latest Mainline, on my dell inspiron 1200, s2r does work,
but ath5k dies out,
and some smp oops is showing up.


full dmesg..:
http://fpaste.org/t1e9/

[  256.469741] BUG: unable to handle kernel NULL pointer dereference at 000000a0
[  256.469763] IP: [<c1390104>] set_regdom+0x1ba/0x501
[  256.469783] *pdpt = 00000000190a0001 *pde = 0000000000000000
[  256.469797] Oops: 0000 [#1] SMP
[  256.469808] Modules linked in: snd_seq snd_seq_device i915
drm_kms_helper drm mperf ath5k ath snd_intel8x0 snd_ac97_codec
ac97_bus snd_pcm snd_timer joydev snd soundcore e100 yenta_socket
psmouse evdev i2c_i801 mii snd_page_alloc button battery video ac
intel_agp intel_gtt uhci_hcd ehci_hcd fan thermal processor
[  256.469898]
[  256.469906] Pid: 3510, comm: crda Not tainted
3.1.0-rc2-00190-g3210d19 #1 Dell Inc. Inspiron 1200
/0C8862
[  256.469927] EIP: 0060:[<c1390104>] EFLAGS: 00010246 CPU: 0
[  256.469939] EIP is at set_regdom+0x1ba/0x501
[  256.469948] EAX: dd9e51a0 EBX: dc4d3ab0 ECX: 00000000 EDX: 00000000
[  256.469959] ESI: ffffff8e EDI: 00000004 EBP: d907dc44 ESP: d907dc00
[  256.469970]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  256.469981] Process crda (pid: 3510, ti=d907c000 task=c1cd0000
task.ti=d907c000)
[  256.469992] Stack:
[  256.469997]  de002500 d907dc18 d907dc44 00000000 dd4de128 dd4de128
dc4d3af8 00000006
[  256.470007]  d907dc3c c11de8b7 00000006 d907dc58 dc4d3af8 dc4d3ab0
dc4d3b10 dc4d3ab0
[  256.470007]  dd4de130 d907dc80 c13964b3 00000000 00000004 00000004
00000000 dd4de100
[  256.470007] Call Trace:
[  256.470007]  [<c11de8b7>] ? nla_parse+0x3c/0x8f
[  256.470007]  [<c13964b3>] nl80211_set_reg+0x197/0x1e9
[  256.470007]  [<c1330bf9>] genl_rcv_msg+0x1cb/0x1e8
[  256.470007]  [<c1330a2e>] ? genl_rcv+0x22/0x22
[  256.470007]  [<c133014c>] netlink_rcv_skb+0x32/0x73
[  256.470007]  [<c1330a27>] genl_rcv+0x1b/0x22
[  256.470007]  [<c132fc76>] netlink_unicast+0x1af/0x210
[  256.470007]  [<c132feff>] netlink_sendmsg+0x228/0x276
[  256.470007]  [<c130abf4>] sock_sendmsg+0xc3/0xde
[  256.470007]  [<c10cedde>] ? might_fault+0x36/0x70
[  256.470007]  [<c10cedde>] ? might_fault+0x36/0x70
[  256.470007]  [<c10cedde>] ? might_fault+0x36/0x70
[  256.470007]  [<c11d234e>] ? _copy_from_user+0x39/0x4d
[  256.470007]  [<c131367e>] ? verify_iovec+0x3e/0x74
[  256.470007]  [<c130ae0e>] __sys_sendmsg+0x17d/0x202
[  256.470007]  [<c130aa0a>] ? sock_sendmsg_nosec+0xbb/0xbb
[  256.470007]  [<c13da231>] ? _raw_spin_unlock+0x1d/0x20
[  256.470007]  [<c10eae81>] ? fget_light+0xce/0x248
[  256.470007]  [<c130c0ce>] sys_sendmsg+0x2b/0x46
[  256.470007]  [<c130c555>] sys_socketcall+0x166/0x1b4
[  256.470007]  [<c11d1d3c>] ? trace_hardirqs_on_thunk+0xc/0x10
[  256.470007]  [<c13df898>] sysenter_do_call+0x12/0x38
[  256.470007] Code: ff 76 08 68 36 91 57 c1 e8 fb 74 04 00 83 c4 14
47 83 c6 18 3b 3b 72 bc e9 9f 01 00 00 83 78 04 02 75 2d 8b 4d c8 be
8e ff ff ff
[  256.470007]  b9 a0 00 00 00 00 0f 85 89 01 00 00 89 c8 89 da 05 a0 00 00
[  256.470007] EIP: [<c1390104>] set_regdom+0x1ba/0x501 SS:ESP 0068:d907dc00
[  256.470007] CR2: 00000000000000a0
[  256.470555] ---[ end trace abd4fbefd1655e11 ]---

last good kernel I have with this is:
3.1.0-rc1 (minus the i915 s2r problem thats fixed now)
if you need any patches tested on this let me know. I can try a bisect
since its not to much
(but might be a while, since the machine is sloooow!!)

-- 
Justin P. Mattock
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