linux-kernel - [BUG] Boot failure with i915 and commit 0136db586c028f71e7cc21cc183064ff0d5919c8

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Date:	Fri, 27 Jul 2012 03:16:11 -0400
From:	Stephen Gilles <sgilles@...pmail.umd.edu>
To:	linux-kernel@...r.kernel.org
Subject: [BUG] Boot failure with i915 and commit
 0136db586c028f71e7cc21cc183064ff0d5919c8

Hello,

I built -rc7 the other day, and when I attempt to boot, I get a kernel panic
 which seems related to the i915 driver.

[ hand copied, this is a log from 3.5-rc7, with timing information
removed ]

 ffff8801394abb90 ffffffff81152bb 000000000000000 ffff8801396e7240
 0000000000000000 0000000fffffffe 000000000000000 ffff880138cc0000
Call Trace:
 [<ffffffff811525bb>] sysfs_find_dirent+0x77/0xd8
 [<ffffffff81152752>] sysfs_get_dirent+0x32/0x6b
 [<ffffffff81153b02>] sysfs_merg_group+0x22/0x9b
 [<ffffffff812e118a>] i915_setup_sysfs+0x2b/0x46
 [<ffffffff812cdbc7>] i915_driver_load+0x82d/0x93c
 [<ffffffff812b8365>] ? drm_get_minor+0x240/0x29a
 [<ffffffff812ba1bb>] drm_get_pci_dev+0x160/0x26b
 [<ffffffff81528a35>] ? _raw_spin_unlock+0x23/0x27
 [<ffffffff8150ee08>] i915_pci_probe+0x1b/0x1d
 [<ffffffff812432e4>] pci_device_probe+0x57/0x82
 [<ffffffff8130e39f>] ? driver_sysfs_add+0x6b/0x91
 [<ffffffff8130e625>] driver_probe_device+0xa5/0x1ab
 [<ffffffff8130e785>] __driver_attach+0x5a/0x7e
 [<ffffffff8130e72b>] ? driver_probe_device+0x1ab/0x1ab
 [<ffffffff8130cece>] bus_for_each_dev+0x57/0x83
 [<ffffffff8130e1d8>] driver_attach+0x19/0x1b
 [<ffffffff8130dddb>] bus_add_driver+0xc5/0x218
 [<ffffffff8130ea51>] driver_register+0x8c/0xf9
 [<ffffffff81243736>] __pci_register_driver+0x61/0xbf
 [<ffffffff812ba346>] drm_pci_init+0x80/0xe5
 [<ffffffff818b46dc>] i915_init+0x8d/0x8d
 [<ffffffff81000afa>] do_one_initcall+0x7a/0x13c
 [<ffffffff81892c0b>] kernel_init+0x106/0x18a
 [<ffffffff8189256c>] ? do_early_param+0x86/0x86
 [<ffffffff8152aa74>] kernel_thread_helper+0x4/0x10
 [<ffffffff81528eb0>] ? retint_restore_args+0x13/0x13
 [<ffffffff81892b05>] ? start_kernel+0x13/0x13
 [<ffffffff8152aa70>] ? gs_change+0x13/0x13
Code: 90 48 8b 87 b0 00 00 00 55 48 89 e5 5d f6 80 81 00 00 00 20 0f 95 c0 0f b6 c0 c3 55 31 c0 48 89 fa 48 83 c9 ff 48 89 f7 48 89 e5 <f2> ae 31 ff 31 c0
48 f7 d1 ff c9 eb 1d 4c 0f be 04 3e 48 ff c7
RIP  [<ffffffff8115197a>] sysfs_name_hash+0x10/0x72
 RSP <ffff8801394abb50>
CR2: 0000000000000000
---[ end trace 9fa371afd12ec4dc ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009

panic occured, switching back to text console
[ hand copy ends here]

My .config is attached (as I'm not sure which parts of it are strictly
relevant, so I'll err on the side of too much), the machine is an
Intel i5-2520 in a Lenovo x220 with Intel Integrated graphics (2nd 
Generation Core Processor Family Integrated Graphics Controller rev 09 
according to lspci).

I have bisected the issue to commit 0136db586c028f71e7cc21cc183064ff0d5919c8,
"drm/i915: rc6 in sysfs" , which is certainly older than 3.5-rc7.

My apologies for the chatter if this is a known issue already.

Please CC me on replies (I am not subscribed to the ML).

--
Stephen Gilles

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