[DRBD-user] Kernel BUG at fs/bio.c while using drbd 8.0.1

[Rafał Kupka]

On Mon, Apr 02, 2007 at 06:43:07PM +0200, Philipp Reisner wrote:
Hello,

> The purpose of the drbd_merge_bvec() function is to make sure
> that this can not happen.
> 
> Find out it drbd_merge_bvec() is called at all, and what it
> returned for the call that correlates to the offending bio.

It looks like drbd_merge_bvec isn't called on this struct bio.

With patch attached to this message I got logs like:

BUG: at /usr/src/modules/drbd/drbd/drbd_req.c:1118 drbd_make_request_26()

Call Trace:
 [<ffffffff88363df4>] :drbd:drbd_make_request_26+0x2f2/0x39a
 [<ffffffff8021c8f2>] generic_make_request+0x13d/0x150
 [<ffffffff8810017f>] :dm_mod:clone_bio+0x48/0x79
 [<ffffffff88100d0a>] :dm_mod:__split_bio+0x161/0x372
 [<ffffffff8020a90d>] kmem_cache_alloc+0x56/0x61
 [<ffffffff8022405a>] mempool_alloc+0x24/0xda
 [<ffffffff881016c4>] :dm_mod:dm_request+0x101/0x110
 [<ffffffff8021c8f2>] generic_make_request+0x13d/0x150
 [<ffffffff8810017f>] :dm_mod:clone_bio+0x48/0x79
 [<ffffffff88100d0a>] :dm_mod:__split_bio+0x161/0x372
 [<ffffffff8025cb1a>] thread_return+0x5d/0x108
 [<ffffffff881016c4>] :dm_mod:dm_request+0x101/0x110
 [<ffffffff8021c8f2>] generic_make_request+0x13d/0x150
 [<ffffffff802334b4>] submit_bio+0xb4/0xbb
 [<ffffffff8036e27d>] dispatch_rw_block_io+0x4b4/0x51b
 [<ffffffff803970ac>] sock_alloc_send_skb+0x77/0x1d2
 [<ffffffff881028ba>] :dm_mod:dm_table_unplug_all+0x33/0x41
 [<ffffffff80209786>] __d_lookup+0xb0/0x100
 [<ffffffff881028ba>] :dm_mod:dm_table_unplug_all+0x33/0x41
 [<ffffffff8036e51f>] blkif_schedule+0x23b/0x328
 [<ffffffff8028e55e>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8036e2e4>] blkif_schedule+0x0/0x328
 [<ffffffff8028e3c6>] keventd_create_kthread+0x0/0x65
 [<ffffffff80232aad>] kthread+0xd1/0x100
 [<ffffffff8025af48>] child_rip+0xa/0x12
 [<ffffffff8028e3c6>] keventd_create_kthread+0x0/0x65
 [<ffffffff802329dc>] kthread+0x0/0x100
 [<ffffffff8025af3e>] child_rip+0x0/0x12

drbd_make_request_26: bio:ffff88000b9e5740 bvec:ffff88000a71e380 bio_size:4096 bio_offset:1342405632

No corresponding printk from drbd_merge_bvec().

What I can do now?

Regards,
Kupson
PS: Tested on 2.6.20.6 and drbd 8.0.2.
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