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Description of problem: I got the following - SCSI device sdc: drive cache: write back sdc: unknown partition table sd 3:0:0:0: Attached scsi disk sdc device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised: dm-devel@redhat.com ============================================= [ INFO: possible recursive locking detected ] 2.6.18-1.2708.fc6 #1 --------------------------------------------- init/1 is trying to acquire lock: (&md->io_lock){----}, at: [<ffffffff880fa654>] dm_request+0x25/0x130 [dm_mod] but task is already holding lock: (&md->io_lock){----}, at: [<ffffffff880fa654>] dm_request+0x25/0x130 [dm_mod] other info that might help us debug this: 1 lock held by init/1: #0: (&md->io_lock){----}, at: [<ffffffff880fa654>] dm_request+0x25/0x130 [dm_mod] stack backtrace: Call Trace: [<ffffffff8026ed0d>] show_trace+0xae/0x336 [<ffffffff8026efaa>] dump_stack+0x15/0x17 [<ffffffff802a8821>] __lock_acquire+0x135/0x9d9 [<ffffffff802a9668>] lock_acquire+0x4b/0x69 [<ffffffff802a5f1d>] down_read+0x3e/0x4a [<ffffffff880fa654>] :dm_mod:dm_request+0x25/0x130 [<ffffffff8021cf44>] generic_make_request+0x21a/0x235 [<ffffffff880f9402>] :dm_mod:__map_bio+0xca/0x104 [<ffffffff880f9e48>] :dm_mod:__split_bio+0x16a/0x36b [<ffffffff880fa74c>] :dm_mod:dm_request+0x11d/0x130 [<ffffffff8021cf44>] generic_make_request+0x21a/0x235 [<ffffffff80235fc1>] submit_bio+0xd3/0xdc [<ffffffff8021b366>] submit_bh+0x100/0x124 [<ffffffff802e271b>] block_read_full_page+0x283/0x2a1 [<ffffffff802e4dc2>] blkdev_readpage+0x13/0x15 [<ffffffff80213576>] __do_page_cache_readahead+0x17b/0x1fc [<ffffffff80234f3a>] blockable_page_cache_readahead+0x5f/0xc1 [<ffffffff8021476f>] page_cache_readahead+0x146/0x1bb [<ffffffff8020c2ba>] do_generic_mapping_read+0x157/0x4b4 [<ffffffff8020c775>] __generic_file_aio_read+0x15e/0x1b4 [<ffffffff802c90be>] generic_file_read+0xc6/0xe0 [<ffffffff8020b615>] vfs_read+0xcc/0x172 [<ffffffff80212197>] sys_read+0x47/0x6f [<ffffffff8026094e>] system_call+0x7e/0x83 DWARF2 unwinder stuck at system_call+0x7e/0x83 Leftover inexact backtrace: A partition table is indeed "unknown" as an initial part of that disk was just wiped out in order to remove traces of whatever could be present there (and possibly an old RAID signature or whatever can be mistaken for it). Version-Release number of selected component (if applicable): kernel 2.6.18-1.2708.fc6 How reproducible: So far it looks pretty consistent with a disk treated as mentioned above.
Actually a missing partition is not the reason. I have now SCSI device sdc: drive cache: write back sdc: sdc1 and still the same "possible recursive locking detected" with the same traceback. /dev/sdb has a dmraid signature on it, even if no dmraid is really in use, but a similar signature on /dev/sdc was removed and initrd rebuild after that. Still the same as above.
*** This bug has been marked as a duplicate of 204311 ***