netdev - unable to handle paging request, arm, at aio/tcp code, only 3.6

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Message-ID: <20121119183222.GI2068@vicerveza.homeunix.net>
Date:	Mon, 19 Nov 2012 19:32:22 +0100
From:	Lluís Batlle i Rossell <viric@...ic.name>
To:	netdev@...r.kernel.org
Subject: unable to handle paging request, arm, at aio/tcp code, only 3.6

(crosspost from lkml)
Hello,

in a Sheevaplug (armv5tel), if I run the kernels 3.6.3 or 3.6.6, they crash in
less than 48h. Kernel 3.5.3 runs perfect, as most previous kernels I've been
running until 2.6.36.

Can anyone suggest what change can be the cause of that?
Or how could I debug this to fix it?

Here is the panic:
unable to handle kernel paging request at virtual address ffffffab
pgd = d864c000
[ffffffab] *pgd=1fffe831, *pte=00000000, *ppte=00000000
Internal error: Oops: 1 [#1] PREEMPT ARM
Modules linked in: netconsole cbc sg cryptodev(O) fuse ipv6 ums_cypress dm_mod btrfs ext4 jb
d2 reiserfs [last unloaded: netconsole]
CPU: 0    Tainted: G           O  (3.6.6 #1)
PC is at tcp_v6_mtu_reduced+0x40/0x80 [ipv6]
LR is at ip6_dst_lookup_tail+0xd8/0xfc [ipv6]
pc : [<bf2b02f8>]    lr : [<bf28a67c>]    psr: a0000013
sp : d8649c78  ip : d8649b90  fp : d8649c94
r10: 00000b50  r9 : fffffff5  r8 : 00000000
r7 : d2c4a100  r6 : 000032e8  r5 : ffffff9b  r4 : d2c4a100
r3 : 00000000  r2 : a0000093  r1 : c0c5f460  r0 : ffffff9b
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 0005397f  Table: 1864c000  DAC: 00000015
Process httpd (pid: 1923, stack limit = 0xd8648270)
Stack: (0xd8649c78 to 0xd864a000)
9c60:                                                       bf2b02b8 00000020
9c80: d2c4a100 000032e8 d8649cac d8649c98 c0439f18 bf2b02c8 d8648000 000032e8
9ca0: d8649cdc d8649cb0 c03e3dfc c0439e28 00000000 00000040 000032e8 000032e8
9cc0: d2c4a100 00000000 fffffff5 00000b50 d8649d74 d8649ce0 c042b7ac c03e3d0c
9ce0: 00000000 c035fac0 00010000 00000000 00000000 d863bd10 d8649d14 00000000
9d00: 00000000 00000630 00000000 00000001 d8649ee4 d8648000 00000001 00000000
9d20: d2c4a190 000005a8 00000a28 000032e8 00490cb0 00000040 dfa5a220 00000b50
9d40: 00000000 00000001 00000000 d2c4a100 d8649e18 d8649e18 00000003 d8649db8
9d60: 00005000 dafc59a0 d8649d94 d8649d78 c044f37c c042b6d8 c03e2474 c0037ee4
9d80: 00005000 d8649d98 d8649e04 d8649d98 c03de7e8 c044f338 d2e6001c c0044d14
9da0: 00000015 00005000 dafc59a0 ccb9e9f4 00000000 d8649db8 00000000 00000000
9dc0: d8649ed4 00000003 00000000 00000000 00000040 d8649e18 50a95c6c 00000000
9de0: 00000000 fffffdee d8649ed4 00000003 00005000 c03de6e4 d8649ec4 d8649e08
9e00: c00db170 c03de6f4 00000000 00000000 d868c480 dfa5a220 00000000 00000000
9e20: 00000000 00000001 ffffffff d868c480 00000000 00000000 00000000 00000000
9e40: dfa5a220 00000000 00000000 00000000 00000000 00000000 d8649d98 00000000
9e60: 00005000 00000000 00005000 00000000 00000000 00000000 00000000 00000000
9e80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 d868c480
9ea0: 00005000 d8649ed4 00000001 00000003 d8649f70 00005000 d8649f44 d8649ec8
9ec0: c00db41c c00db0cc d8649f70 c03de6e4 d8649ef0 004878e8 00001f40 0048f908
9ee0: 00001f40 0047d8c0 00001180 c050a478 d8649ef0 d8649ef0 d8648000 c012184c
9f00: 00000000 d8648000 cbac00dc 00000002 d8649fa4 d8649ed4 c012184c 00000003
9f20: beeeb1a0 d8649f70 00000092 00000000 00000000 00000000 d8649f6c d8649f48
9f40: c00db580 c00db36c d8649f70 c00db6c0 00000003 d868c480 beeeb1a0 00000003
9f60: d8649fa4 d8649f70 c00db6e4 c00db528 00000000 00000000 d8649fa4 00000000
9f80: 0001117e 00000003 0000000b beeeb1a0 c0009484 d8648000 00000000 d8649fa8
9fa0: c0009260 c00db6a8 00000003 0000000b 0000000b beeeb1a0 00000003 b6c99000
9fc0: 00000003 0000000b beeeb1a0 00000092 beeeb134 00000003 00000000 beeeb1a0
9fe0: 00000000 beeeb0f8 b6d39ef4 b6c2d768 60000010 0000000b 6c644a76 64703347
[<bf2b02f8>] (tcp_v6_mtu_reduced+0x40/0x80 [ipv6]) from [<c0439f18>] (tcp_release_cb+0x100/0x120)
[<c0439f18>] (tcp_release_cb+0x100/0x120) from [<c03e3dfc>] (release_sock+0x100/0x17c)
[<c03e3dfc>] (release_sock+0x100/0x17c) from [<c042b7ac>] (tcp_sendmsg+0xe4/0xe8c)
[<c042b7ac>] (tcp_sendmsg+0xe4/0xe8c) from [<c044f37c>] (inet_sendmsg+0x54/0x88)
[<c044f37c>] (inet_sendmsg+0x54/0x88) from [<c03de7e8>] (sock_aio_write+0x104/0x114)
[<c03de7e8>] (sock_aio_write+0x104/0x114) from [<c00db170>] (do_sync_readv_writev+0xb4/0xe8)
[<c00db170>] (do_sync_readv_writev+0xb4/0xe8) from [<c00db41c>] (do_readv_writev+0xc0/0x1bc)
[<c00db41c>] (do_readv_writev+0xc0/0x1bc) from [<c00db580>] (vfs_writev+0x68/0x84)
[<c00db580>] (vfs_writev+0x68/0x84) from [<c00db6e4>] (sys_writev+0x4c/0x78)
[<c00db6e4>] (sys_writev+0x4c/0x78) from [<c0009260>] (ret_fast_syscall+0x0/0x2c)
Code: e59014d0 eb001678 e2505000 0afffffa (e5953010)
---[ end trace 8b4363f5e83db74f ]---
Kernel panic - not syncing: Fatal exception in interrupt
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