Subject: linux-next: spinlock lockup with next-20081118 on powerpc

From: Stephen Rothwell <[email-masked]>
Date: Wed, 19 Nov 2008 09:30:23 +1100

Hi all,

I got this in my boot test last night:

Begin: Waiting for root file system... ...
BUG: spinlock lockup on CPU#1, vol_id/3246, c000000000b09700
Call Trace:
[c000000040ef7080] [c00000000000fb58] .show_stack+0x70/0x184 (unreliable)
[c000000040ef7130] [c00000000027adac] ._raw_spin_lock+0x140/0x17c
[c000000040ef71d0] [c0000000004ec648] ._spin_lock_irqsave+0x8c/0xc4
[c000000040ef7270] [c0000000000659dc] .lock_timer_base+0x38/0x90
[c000000040ef7310] [c000000000065b50] .__mod_timer+0x4c/0x11c
[c000000040ef73c0] [c00000000025ae9c] .blk_plug_device+0xc0/0xd8
[c000000040ef7440] [c00000000025bb90] .__make_request+0x498/0x518
[c000000040ef74f0] [c000000000259dc8] .generic_make_request+0x24c/0x2a4
[c000000040ef75b0] [c00000000025b6d0] .submit_bio+0x108/0x130
[c000000040ef7670] [c0000000001210e4] .submit_bh+0x174/0x1c0
[c000000040ef7700] [c0000000001259a8] .block_read_full_page+0x34c/0x3b4
[c000000040ef7820] [c000000000129a60] .blkdev_readpage+0x20/0x38
[c000000040ef78a0] [c0000000000c111c] .__do_page_cache_readahead+0x23c/0x2b8
[c000000040ef7980] [c0000000000c1370] .ondemand_readahead+0x1d8/0x210
[c000000040ef7a30] [c0000000000b7f20] .generic_file_aio_read+0x224/0x620
[c000000040ef7b60] [c0000000000f9020] .do_sync_read+0xc4/0x124
[c000000040ef7cf0] [c0000000000f98e0] .vfs_read+0xd8/0x1bc
[c000000040ef7d90] [c0000000000f9f0c] .sys_read+0x4c/0x8c
[c000000040ef7e30] [c0000000000084d4] syscall_exit+0x0/0x40

This was on a Power5 partition.  I am attempting to reproduce the problem.

Any clues?
-- 
Cheers,
Stephen Rothwell                    [email-masked]
http://www.canb.auug.org.au/~sfr/