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octeon: oops/panic with CONFIG_SERIO_I8042=y

To: linux-mips@linux-mips.org, David Daney <ddaney.cavm@gmail.com>
Subject: octeon: oops/panic with CONFIG_SERIO_I8042=y
From: Faidon Liambotis <paravoid@debian.org>
Date: Thu, 18 Jul 2013 15:25:56 +0300
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Hi,

My goal is to run a standard Debian kernel and its octeon variant[1] on the Ubiquity EdgeRouter Lite. The ERLite needs a couple of patches to boot and work (octeon-ethernet patch, octeon-usb driver) but these are already merged 3.11 and I'll file Debian bugs to enable those settings appropriately.

1: e.g. http://packages.debian.org/sid/linux-image-3.10-1-octeon

However, when trying to boot a standard Debian kernel in the ERLite I get a 7s delay followed by an oops for a Data bus error on i8042_flush() and ending up with a panic. It looks like the kernel is built with CONFIG_SERIO_I8042=y. The Octeon machine Debian owns prints "i8042: No controller found" but works nevertheless. This isn't the case with the ERLite; I tried 3.2 & 3.10 and got the same oops which went away as soon as I disabled CONFIG_SERIO_I8042.

Are there even any octeon machines with i8042 anyway? Should I request for the setting to be disabled irrespective of this bug?

The oops is as follows:
[    1.702762] ehci-pci: EHCI PCI platform driver
[    1.707913] usbcore: registered new interface driver usb-storage
[    8.591312] Data bus error, epc == ffffffff81446838, ra == ffffffff814467f0
[    8.598102] Oops[#1]:
[    8.600360] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0 #5
[    8.606253] task: a80000041f869540 ti: a80000041f86c000 task.ti: 
a80000041f86c000
[    8.613706] $ 0   : 0000000000000000 0000000000000000 0000000000000000 
0000000000010000
[    8.621684] $ 4   : 0000000000000000 a80000041f1bbb40 000000000000006f 
ffffffff816ffe60
[    8.629662] $ 8   : 0000000000000000 000000000000005b 726564206e657720 
696e746572666163
[    8.637640] $12   : 0000000000000000 ffffffff8136b0dc ffffffff81790000 
0000000000000000
[    8.645619] $16   : 80011a0400000064 80011a0400000000 0000000000000010 
ffffffff817a0000
[    8.653597] $20   : ffffffff817a0000 0000000000000001 ffffffff81770e20 
ffffffff817a0000
[ 8.661575] $24 : 0000000000000004 ffffffff81790000 [ 8.669553] $28 : a80000041f86c000 a80000041f86fd70 0000000000000000 ffffffff814467f0
[    8.677532] Hi    : 0000000000acd49d
[    8.681088] Lo    : 0e5604189441f8e5
[    8.684661] epc   : ffffffff81446838 i8042_flush+0x80/0x118
[    8.690194]     Not tainted
[    8.692975] ra    : ffffffff814467f0 i8042_flush+0x38/0x118
[ 8.698518] Status: 10008ce2 KX SX UX KERNEL EXL [ 8.703201] Cause : 4080801c
[    8.706064] PrId  : 000d0601 (Cavium Octeon+)
[    8.710398] Modules linked in:
[    8.713439] Process swapper/0 (pid: 1, threadinfo=a80000041f86c000, 
task=a80000041f869540, tls=0000000000000000)
[    8.723580] Stack : ffffffff81700000 ffffffff81751158 0000000000000000 
ffffffff8175f2f8
          ffffffff817361d8 ffffffff8175f288 ffffffff81770e20 ffffffff816c0000
          000000000000008c ffffffff817511ac 0000000000000000 ffffffff81780000
          ffffffff81751158 ffffffff811004e0 ffffffff817361d8 0000000000000030
          ffffffff81780000 0000000000000007 ffffffff8175f2f8 ffffffff81736b50
          ffffffff81595080 0000000000000000 ffffffff81780000 0000000000000000
          0000000000000000 0000000000000000 0000000000000000 0000000000000000
          0000000000000000 ffffffff8159509c ffffffff81595080 0000000000000000
          0000000000000000 ffffffff8111a124 0000000000000000 0000000000000000
          0000000000000000 0000000000000000 0000000000000000 0000000000000000
          ...
[    8.788447] Call Trace:
[    8.790882] [<ffffffff81446838>] i8042_flush+0x80/0x118
[    8.796092] [<ffffffff817511ac>] i8042_init+0x54/0xf0
[    8.801118] [<ffffffff811004e0>] do_one_initcall+0xe0/0x130
[ 8.806658] [ 8.808132] Code: 14800017 27de0001 92020000 <305600ff> cac00003 24040032 17d2fff4 00200825 6684d338 [ 8.820195] ---[ end trace 76cca175541407ab ]---
[    8.824650] note: swapper/0[1] exited with preempt_count 1
[    8.830188] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b
[ 8.830188]
Regards,
Faidon

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