pour reference, here is the oops I mentionned earlier, happening when portdisabling on a brocade switch during streaming read on a multipath map : (kernel 2.6.10-rc1-udm2) SCSI error : <2 0 2 3> return code = 0x10000 SCSI error : <2 0 2 3> return code = 0x10000 SCSI error : <2 0 2 3> return code = 0x10000 SCSI error : <2 0 2 2> return code = 0x10000 SCSI error : <2 0 2 2> return code = 0x10000 SCSI error : <2 0 2 2> return code = 0x10000 device-mapper: dm-multipath: error getting device device-mapper: error adding target to table Device sde not ready. end_request: I/O error, dev sde, sector 4493616 Device sdb not ready. end_request: I/O error, dev sdb, sector 4493616 Unable to handle kernel paging request at ffffff000005e1b7 RIP: [<ffffff000005e1b7>] PML4 3c6063 PGD fbb07067 PMD fbb06067 PTE 80000000cc144163 Oops: 0011 [1] SMP CPU 1 Modules linked in: dm_round_robin af_packet iscsi_sfnet ipv6 smbfs lpfc scsi_transport_fc i2c_amd756 i2c_core hw_random amd74xx evdev ohci_hcd tg3 ide_generic ide_cd ide_core cdrom ext3 jbd mbcache sd_mod dm_multipath dm_mod mptscsih scsi_mod mptbase unix Pid: 7, comm: events/1 Not tainted 2.6.10-rc1 RIP: 0010:[<ffffff000005e1b7>] [<ffffff000005e1b7>] RSP: 0018:0000010004f8de60 EFLAGS: 00010247 RAX: ffffff000005e1af RBX: 00000100f8899a78 RCX: 0000010004f8ded0 RDX: ffffff000005e1b1 RSI: 0000000000000212 RDI: 00000100f8899a00 RBP: 00000100f8899a80 R08: 0000010004f8c000 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000000 R12: 0000010004f64880 R13: 0000000000000212 R14: 00000100f8899a00 R15: ffffff000005e1b7 FS: 0000000040037970(0000) GS:ffffffff803b9500(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: ffffff000005e1b7 CR3: 0000000004dfa000 CR4: 00000000000006e0 Process events/1 (pid: 7, threadinfo 0000010004f8c000, task 00000100fba32070) Stack: ffffffff80143548 0000010004f648c0 0000010004f64898 0000010004f648a8 ffffffffffffffff 0000000000000001 0000000000000000 ffffffff8012f1cc 0000000000010000 0000000000000000 Call Trace:<ffffffff80143548>{worker_thread+501} <ffffffff8012f1cc>{default_wake_function+0} <ffffffff8012f1cc>{default_wake_function+0} <ffffffff80143353>{worker_thread+0} <ffffffff801472e1>{kthread+218} <ffffffff80110f93>{child_rip+8} <ffffffff80147207>{kthread+0} <ffffffff80110f8b>{child_rip+0} Code: ff ff 05 00 00 ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00 RIP [<ffffff000005e1b7>] RSP <0000010004f8de60> CR2: ffffff000005e1b7 SCSI error : <2 0 2 2> return code = 0x10000 SCSI error : <2 0 2 2> return code = 0x10000 --