Sent this a few days ago, but got no response. Probably because I addressed this to the wrong persons. So, next try. With current git tree as of today I get this: ============================================= [ INFO: possible recursive locking detected ] 2.6.19-rc6-g1b9bb3c1 #28 --------------------------------------------- kpartx/945 is trying to acquire lock: (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c but task is already holding lock: (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c other info that might help us debug this: 1 lock held by kpartx/945: #0: (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c stack backtrace: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 00000000003a4d68 00000000003a4d68 0000000000016272 040000000d983280 00000000006d93e8 0000000000000000 0000000000477620 0000000000000000 000000000000000d 000000000d983380 000000000d9833f8 0000000000372450 0000000000016272 000000000d983380 000000000d9833d0 Call Trace: ([<00000000000161d8>] show_trace+0xc0/0xdc) [<0000000000016294>] show_stack+0xa0/0xd0 [<00000000000162f2>] dump_stack+0x2e/0x3c [<0000000000063244>] __lock_acquire+0xa80/0xeac [<0000000000063c10>] lock_acquire+0x90/0xc0 [<000000000005d540>] down_read+0x54/0x9c [<00000000001f8faa>] dm_request+0x42/0x24c [<000000000017e528>] generic_make_request+0x174/0x1fc [<00000000001f88ee>] __map_bio+0x7e/0xec [<00000000001f8f44>] __split_bio+0x510/0x534 [<00000000001f915c>] dm_request+0x1f4/0x24c [<000000000017e528>] generic_make_request+0x174/0x1fc [<000000000017e672>] submit_bio+0xc2/0x18c [<00000000000d7a00>] submit_bh+0x13c/0x1d8 [<00000000000da95c>] block_read_full_page+0x3f0/0x470 [<00000000000dd2e0>] blkdev_readpage+0x30/0x40 [<0000000000084638>] __do_page_cache_readahead+0x190/0x300 [<0000000000084976>] blockable_page_cache_readahead+0x7a/0x104 [<0000000000084db4>] page_cache_readahead+0x29c/0x328 [<000000000007c14c>] do_generic_mapping_read+0x428/0x51c [<000000000007e8fc>] generic_file_aio_read+0x160/0x244 [<00000000000a9cac>] do_sync_read+0xd8/0x130 [<00000000000a9dac>] vfs_read+0xa8/0x188 [<00000000000aa19a>] sys_read+0x56/0x88 [<0000000000020d40>] sysc_noemu+0x10/0x16 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel