Hi, I'm finally finding time to work and play with dm-mpath again. It works, unless there's a failure ;-) (I've added a couple more log messages in places so that it's a little bit more obvious. Right now, dm/dm-mpath rather keeps its troubles to itself; if this was a relationship, I'd be sending it to a relationship counselor that talking is much better than silently breaking...) Anyway: device-mapper: dm-multipath: IO error on path 8:0, sector 256 device-mapper: dm-multipath: no valid paths left. Buffer I/O error on device dm-4, logical block 31 Unable to handle kernel NULL pointer dereference at virtual address 00000010 printing eip: f89cc8e0 *pde = 00102001 Oops: 0000 [#1] SMP CPU: 0 EIP: 0060:[<f89cc8e0>] Tainted: G U EFLAGS: 00010282 (2.6.5-7.162-bigsmp SLES9_SP2_BRANCH-200504181325230000) EIP is at multipath_end_io+0x90/0x240 [dm_multipath] eax: 00000000 ebx: f7f60b80 ecx: fffffffb edx: 00000000 esi: f2dad1c0 edi: 00000000 ebp: f737c45c esp: cde59eac ds: 007b es: 007b ss: 0068 Process events/0 (pid: 18, threadinfo=cde58000 task=cde48000) Stack: f2dadf00 00001000 00000008 00000000 00000001 f7f60b90 00000000 fffffffb f6e153f0 f7dfb3f0 f2dad1c0 f89e1580 f6e153f8 f8914080 f89cc850 00000000 f2dad1c0 00001000 f89e1510 fffffffb c017f078 00000001 00000296 00000296 Call Trace: [<f89e1580>] clone_endio+0x70/0x120 [dm_mod] [<f89cc850>] multipath_end_io+0x0/0x240 [dm_multipath] [<f89e1510>] clone_endio+0x0/0x120 [dm_mod] [<c017f078>] bio_endio+0x68/0xa0 [<f89ccdac>] process_queued_ios+0x12c/0x140 [dm_multipath] [<c013c2a6>] worker_thread+0x186/0x230 [<f89ccc80>] process_queued_ios+0x0/0x140 [dm_multipath] [<c0123910>] default_wake_function+0x0/0x10 [<c0123910>] default_wake_function+0x0/0x10 [<c013c120>] worker_thread+0x0/0x230 [<c0140019>] kthread+0xf9/0x12d [<c013ff20>] kthread+0x0/0x12d [<c0107005>] kernel_thread_helper+0x5/0x10 Code: 8b 40 10 c7 04 24 e8 da 9c f8 83 c0 14 89 44 24 04 e8 ca f1 Dumping to block device (104,5) on CPU 0 ... Any ideas? Sincerely, Lars Marowsky-Brée <lmb@xxxxxxx> -- High Availability & Clustering SUSE Labs, Research and Development SUSE LINUX Products GmbH - A Novell Business