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Subjectkernel BUG at drivers/block/cciss.c:1260! (with recent linux-2.6 tree)
Hitting a consistent BUG() with recent Linus' linux-2.6.git:

[ 12.941428] ------------[ cut here ]------------
[ 12.944874] kernel BUG at drivers/block/cciss.c:1260!
[ 12.944874] invalid opcode: 0000 [1] SMP
[ 12.944874] CPU 0
[ 12.944874] Modules linked in:
[ 12.944874] Pid: 0, comm: swapper Not tainted 2.6.24 #43
[ 12.944874] RIP: 0010:[<ffffffff8039e43d>] [<ffffffff8039e43d>] cciss_softirq_done+0xbc/0x1bf
[ 12.944874] RSP: 0018:ffffffff8063aed0 EFLAGS: 00010202
[ 12.944874] RAX: 0000000000000001 RBX: ffff8100cf800010 RCX: ffff81042f1253b0
[ 12.944874] RDX: ffff81042de398f0 RSI: ffff81042de398f0 RDI: 0000000000000001
[ 12.944874] RBP: ffff81042daa0000 R08: ffff81042f1253b0 R09: 0000000000000001
[ 12.944874] R10: 00000000000000fe R11: 0000000000000000 R12: 0000000000000002
[ 12.944874] R13: 0000000000000001 R14: ffff8100cf800000 R15: ffff81042de398f0
[ 12.944874] FS: 0000000000000000(0000) GS:ffffffff805bb000(0000) knlGS:0000000000000000
[ 12.944874] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 12.944874] CR2: 00002afed7eea340 CR3: 000000042dbba000 CR4: 00000000000006e0
[ 12.944874] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 12.944874] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 12.944874] Process swapper (pid: 0, threadinfo ffffffff805f4000, task ffffffff805624a0)
[ 12.944874] Stack: 0000000000000000 ffffffff8063af10 0000000000000001 ffffffff80632d60
[ 12.944874] 0000000000000000 000000000000000a ffffffff805bb900 ffffffff8032038f
[ 12.944874] ffffffff8063af10 ffffffff8063af10 ffffffff805bb940 ffffffff802346b4
[ 12.944874] Call Trace:
[ 12.944874] <IRQ> [<ffffffff8032038f>] blk_done_softirq+0x69/0x78
[ 12.944874] [<ffffffff802346b4>] __do_softirq+0x6f/0xd8
[ 12.944874] [<ffffffff8020c45c>] call_softirq+0x1c/0x30
[ 12.944874] [<ffffffff8020e347>] do_softirq+0x30/0x80
[ 12.944874] [<ffffffff8020e409>] do_IRQ+0x72/0xd9
[ 12.944874] [<ffffffff8020a50a>] mwait_idle+0x0/0x46
[ 12.944874] [<ffffffff8020a3da>] default_idle+0x0/0x3d
[ 12.944874] [<ffffffff8020b7e1>] ret_from_intr+0x0/0xa
[ 12.944874] <EOI> [<ffffffff8020a54c>] mwait_idle+0x42/0x46
[ 12.944874] [<ffffffff8020a481>] cpu_idle+0x6a/0xae
[ 12.944874]
[ 12.944874]
[ 12.944874] Code: 0f 0b eb fe 48 8d 85 d8 c0 00 00 48 89 04 24 48 89 c7 e8 e5
[ 12.944874] RIP [<ffffffff8039e43d>] cciss_softirq_done+0xbc/0x1bf
[ 12.944874] RSP <ffffffff8063aed0>
[ 12.944903] ---[ end trace e9c631603f90d22f ]---
code in question is in drivers/block/cciss.c:cciss_softirq_done():

...
if (blk_end_request(rq, (rq->errors == 0) ? 0 : -EIO, blk_rq_bytes(rq)))
BUG();
And appears to be a result of a recent merge:

commit f0f0052069989b80d2a3e50c9cd2f2a650bc1aea
Refs: v2.6.24-1949-gf0f0052
Merge: 68fbda7... a65b586...
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue Jan 29 08:51:32 2008 +1100

Merge branch 'blk-end-request' of git://git.kernel.dk/linux-2.6-block

Here's the commit which added the blk_end_request() BUG() on:

commit 3daeea29f9348263e0dda89a565074390475bdf8
Refs: v2.6.24-1743-g3daeea2
Author: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Tue Dec 11 17:50:03 2007 -0500

blk_end_request: changing cciss (take 4)

This patch converts cciss to use blk_end_request interfaces.
Related 'uptodate' arguments are converted to 'error'.

cciss is a little bit different from "normal" drivers.
cciss directly calls bio_endio() and disk_stat_add()
when completing request. But those can be replaced with
__end_that_request_first().
After the replacement, request completion procedures of
those drivers become like the following:
o end_that_request_first()
o add_disk_randomness()
o end_that_request_last()
This can be converted to blk_end_request() by following
the rule (a) mentioned in the patch subject
"[PATCH 01/30] blk_end_request: add new request completion interface".

Cc: Mike Miller <mike.miller@hp.com>
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

--
av


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