I can reproduce a variety of hangs / oopses using fibre channel storage. I create an md on two fibre channel disks connected to a fabric. (Haven't tried loop.) This sequence of events reliably induces failures like the ones below. -if one doesn't exist, create an md stripe (simple) on two fc disks duck /root# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [multipath] md0 : active raid0 sdi[0] sdf[1] 71687168 blocks 64k chunks portdisable the targets' switch port -wait for the transport dev_loss timer to fire portenable the targets' switch port mdadm --stop /dev/md0 portdisable the targets' switch port -wait again portenable the targets' switch port I'll grant that I'm exploiting a known problem with md and target removal, but I think it's fair to point these issues out. Relevant threads below. http://marc.theaimsgroup.com/?l=linux-scsi&m=114987740529740&w=2 http://marc.theaimsgroup.com/?l=linux-scsi&m=115015423722568&w=2 Using fusion fibre channel ========================== Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA sde: sde1 sde9 sde11 sd 3:0:8:0: Attached scsi disk sde sd 3:0:8:0: Attached scsi generic sg12 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdf: 71687372 512-byte hdwr sectors (36704 MB) sdf: Write Protect is off sdf: Mode Sense: ab 00 10 08 SCSI device sdf: drive cache: write back w/ FUA SCSI device sdf: 71687372 512-byte hdwr sectors (36704 MB) sdf: Write Protect is off sdf: Mode Sense: ab 00 10 08 SCSI device sdf: drive cache: write back w/ FUA sdf:<3>BUG: soft lockup detected on CPU#0! Call Trace: [<a000000100012880>] show_stack+0x40/0xa0 sp=e000003013b6fa60 bsp=e000003013b694e8 [<a000000100012910>] dump_stack+0x30/0x60 sp=e000003013b6fc30 bsp=e000003013b694d0 [<a0000001000f4d30>] softlockup_tick+0x1f0/0x220 sp=e000003013b6fc30 bsp=e000003013b69490 [<a0000001000bb410>] run_local_timers+0x30/0x60 sp=e000003013b6fc30 bsp=e000003013b69478 [<a0000001000bb4c0>] update_process_times+0x80/0x100 sp=e000003013b6fc30 bsp=e000003013b69448 [<a000000100034650>] timer_interrupt+0x110/0x2e0 sp=e000003013b6fc30 bsp=e000003013b69408 [<a0000001000f53a0>] handle_IRQ_event+0xa0/0x140 sp=e000003013b6fc30 bsp=e000003013b693c0 [<a0000001000f5570>] __do_IRQ+0x130/0x3e0 sp=e000003013b6fc30 bsp=e000003013b69378 [<a0000001000102b0>] ia64_handle_irq+0xb0/0x160 sp=e000003013b6fc30 bsp=e000003013b69348 [<a00000010000bb20>] ia64_leave_kernel+0x0/0x290 sp=e000003013b6fc30 bsp=e000003013b69348 [<a000000100051f10>] smp_call_function+0x290/0x340 sp=e000003013b6fe00 bsp=e000003013b692e8 [<a0000001000aeca0>] on_each_cpu+0x60/0x140 sp=e000003013b6fe20 bsp=e000003013b692b0 [<a00000010015ebe0>] invalidate_bdev+0x40/0x80 sp=e000003013b6fe20 bsp=e000003013b69290 [<a00000010016c310>] kill_bdev+0x30/0x80 sp=e000003013b6fe20 bsp=e000003013b69270 [<a00000010016d280>] __blkdev_put+0xa0/0x420 sp=e000003013b6fe20 bsp=e000003013b69228 [<a00000010016d690>] blkdev_put+0x30/0x60 sp=e000003013b6fe30 bsp=e000003013b69208 [<a00000010016f220>] blkdev_close+0x60/0x80 sp=e000003013b6fe30 bsp=e000003013b691d0 [<a00000010015ad80>] __fput+0x1a0/0x400 sp=e000003013b6fe30 bsp=e000003013b69190 [<a00000010015b020>] fput+0x40/0x60 sp=e000003013b6fe30 bsp=e000003013b69170 [<a0000001001547f0>] filp_close+0x110/0x140 sp=e000003013b6fe30 bsp=e000003013b69140 [<a000000100154960>] sys_close+0x140/0x1a0 sp=e000003013b6fe30 bsp=e000003013b690c8 [<a00000010000b980>] ia64_ret_from_syscall+0x0/0x20 sp=e000003013b6fe30 bsp=e000003013b690c8 [<a000000000010620>] __kernel_syscall_via_break+0x0/0x20 sp=e000003013b70000 bsp=e000003013b690c8 Using Emulex LightPulse Fibre Channel SCSI driver 8.1.7 ======================================================= Unable to handle kernel NULL pointer dereference (address 0000000000000260) scsi_wq_2[1955]: Oops 8813272891392 [1] Modules linked in: ipv6 nfsd exportfs nfs lockd sunrpc mptfc mptscsih mptbase lpfc sg Pid: 1955, CPU 1, comm: scsi_wq_2 psr : 0000101008026018 ifs : 8000000000000003 ip : [<a00000010056ff70>] Not tainted ip is at scsi_is_fc_rport+0x10/0x40 unat: 0000000000000000 pfs : 000000000000040b rsc : 0000000000000003 rnat: 000000003b9aca00 bsps: 000000000001003e pr : 0000000000006581 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70433f csd : 0000000000000000 ssd : 0000000000000000 b0 : a000000203ddeee0 b6 : a000000203ddeea0 b7 : a0000001004d7f20 f6 : 000000000000000000000 f7 : 1003e20c49ba5e353f7cf f8 : 1003e00000000000004e2 f9 : 1003e000000000fa00000 f10 : 1003e000000003b9aca00 f11 : 1003e431bde82d7b634db r1 : a000000100d4c690 r2 : a000000100b5b430 r3 : e0000034f52c7350 r8 : 0000000000000000 r9 : a000000100576ea0 r10 : e00000b07bbeb570 r11 : 0000284100000000 r12 : e00000b07881fc50 r13 : e00000b078818000 r14 : e0000034f7018000 r15 : e00000b078b98390 r16 : e0000034f709c150 r17 : 0000080000000000 r18 : a000000203dfbcd0 r19 : a000000100e95698 r20 : a000000100e95698 r21 : a000000203dfbc68 r22 : e0000034f70180b8 r23 : e0000034f7018000 r24 : 0004380100000000 r25 : 0000380100000000 r26 : 0004000000000000 r27 : a000000203ddeea0 r28 : 000000000000000a r29 : e0000034f52c70d0 r30 : 0000204100000000 r31 : 0000000000000000 Call Trace: [<a000000100012880>] show_stack+0x40/0xa0 sp=e00000b07881f800 bsp=e00000b078819438 kernel BUG at mm/slab.c:3047! scsi_wq_2[1955]: bugcheck! 0 [2] Modules linked in: ipv6 nfsd exportfs nfs lockd sunrpc mptfc mptscsih mptbase lpfc sg Pid: 1955, CPU 1, comm: scsi_wq_2 psr : 0000101008022018 ifs : 800000000000048c ip : [<a00000010014c2e0>] Not tainted ip is at __cache_alloc_node+0x140/0x2e0 unat: 0000000000000000 pfs : 000000000000048c rsc : 0000000000000003 rnat: 9999999996900000 bsps: 000000000000fffd pr : 00000000000065a5 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f csd : 0000000000000000 ssd : 0000000000000000 b0 : a00000010014c2e0 b6 : e0000030025cbb10 b7 : a0000001004d7f20 f6 : 000000000000000000000 f7 : 1003e20c49ba5e353f7cf f8 : 1003e00000000000000c8 f9 : 10006c7fffffffd73ea5c f10 : 0fffd9999999996900000 f11 : 1003e0000000000000000 r1 : a000000100d4c690 r2 : e00000b078819060 r3 : 0000000000000005 r8 : 0000000000000021 r9 : 0000000000004000 r10 : a000000100b64ce8 r11 : a000000100b64cf8 r12 : e00000b07881f080 r13 : e00000b078818000 r14 : 0000000000000000 r15 : e00000b078819070 r16 : e00000b078819088 r17 : 0000000000004000 r18 : e00000b07881ef31 r19 : a000000100b63ec8 r20 : 0000000000000000 r21 : 0000000000004000 r22 : a000000100b64d00 r23 : a000000100b64ce0 r24 : a000000100a90f00 r25 : a000000100b63dc8 r26 : e00000b078819070 r27 : e00000b078819060 r28 : e00000b078819088 r29 : 0000000000000004 r30 : 0000000000000005 r31 : 000000000000030e BUG: soft lockup detected on CPU#2! BUG: warning at lib/kref.c:32/kref_get() -------------- and this one ----------------- duck /root# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [multipath] md0 : active raid0 sdi[0] sdf[1] 71687168 blocks 64k chunks unused devices: <none> duck /root# lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:e9:fa NPort x131bd1 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:1a:41 NPort x131bd3 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:d8:6c NPort x131bce Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:d8:51 NPort x131bd2 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:e9:80 NPort x131bd4 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:db NPort x131bd6 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:2d NPort x131bd5 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:fb NPort x131bd9 Data: x8 x7 x0 rport-2:0-6: blocked FC remote port time out: removing target and saving binding rport-2:0-7: blocked FC remote port time out: removing target and saving binding rport-2:0-8: blocked FC remote port time out: removing target and saving binding rport-2:0-9: blocked FC remote port time out: removing target and saving binding rport-2:0-10: blocked FC remote port time out: removing target and saving binding rport-2:0-15: blocked FC remote port time out: removing target and saving binding rport-2:0-16: blocked FC remote port time out: removing target and saving binding rport-2:0-17: blocked FC remote port time out: removing target and saving binding Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA sde: sde1 sde9 sde11 sd 2:0:6:0: Attached scsi disk sde sd 2:0:6:0: Attached scsi generic sg8 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdg: 71687372 512-byte hdwr sectors (36704 MB) sdg: Write Protect is off sdg: Mode Sense: ab 00 10 08 SCSI device sdg: drive cache: write back w/ FUA SCSI device sdg: 71687372 512-byte hdwr sectors (36704 MB) sdg: Write Protect is off sdg: Mode Sense: ab 00 10 08 SCSI device sdg: drive cache: write back w/ FUA sdg: sdg1 sdg9 sdg11 sd 2:0:4:0: Attached scsi disk sdg sd 2:0:4:0: Attached scsi generic sg9 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdh: 71687372 512-byte hdwr sectors (36704 MB) sdh: Write Protect is off sdh: Mode Sense: ab 00 10 08 SCSI device sdh: drive cache: write back w/ FUA SCSI device sdh: 71687372 512-byte hdwr sectors (36704 MB) sdh: Write Protect is off sdh: Mode Sense: ab 00 10 08 SCSI device sdh: drive cache: write back w/ FUA sdh: sdh1 sdh9 sdh11 sd 2:0:7:0: Attached scsi disk sdh sd 2:0:7:0: Attached scsi generic sg10 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdj: 71687372 512-byte hdwr sectors (36704 MB) sdj: Write Protect is off sdj: Mode Sense: ab 00 10 08 SCSI device sdj: drive cache: write back w/ FUA SCSI device sdj: 71687372 512-byte hdwr sectors (36704 MB) sdj: Write Protect is off sdj: Mode Sense: ab 00 10 08 SCSI device sdj: drive cache: write back w/ FUA sdj: unknown partition table sd 2:0:5:0: Attached scsi disk sdj sd 2:0:5:0: Attached scsi generic sg11 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 kobject_add failed for 2:0:5:0 with -EEXIST, don't try to register things with the same name in the same directory. Call Trace: [<a000000100012880>] show_stack+0x40/0xa0 sp=e0000030148a7a80 bsp=e0000030148a13c8 [<a000000100012910>] dump_stack+0x30/0x60 sp=e0000030148a7c50 bsp=e0000030148a13b0 [<a0000001004080e0>] kobject_add+0x3a0/0x420 sp=e0000030148a7c50 bsp=e0000030148a1370 [<a0000001004e5330>] device_add+0xf0/0x620 sp=e0000030148a7c50 bsp=e0000030148a1328 [<a000000100566ea0>] scsi_sysfs_add_sdev+0x60/0x520 sp=e0000030148a7c50 bsp=e0000030148a12e0 [<a0000001005629d0>] scsi_probe_and_add_lun+0x11b0/0x1460 sp=e0000030148a7c50 bsp=e0000030148a1278 [<a000000100564100>] __scsi_scan_target+0x780/0xb60 sp=e0000030148a7c70 bsp=e0000030148a1220 [<a000000100564a90>] scsi_scan_target+0xd0/0x100 sp=e0000030148a7cd0 bsp=e0000030148a11c8 [<a000000100571b80>] fc_scsi_scan_rport+0xe0/0x160 sp=e0000030148a7cd0 bsp=e0000030148a11a0 [<a0000001000ca460>] run_workqueue+0x1c0/0x280 sp=e0000030148a7cd0 bsp=e0000030148a1160 [<a0000001000cba50>] worker_thread+0x1d0/0x260 sp=e0000030148a7cd0 bsp=e0000030148a1130 [<a0000001000d3660>] kthread+0x220/0x2a0 sp=e0000030148a7d50 bsp=e0000030148a10e8 [<a000000100010e30>] kernel_thread_helper+0xd0/0x100 sp=e0000030148a7e30 bsp=e0000030148a10c0 [<a000000100009140>] start_kernel_thread+0x20/0x40 sp=e0000030148a7e30 bsp=e0000030148a10c0 error 1 scsi 2:0:5:0: Unexpected response from lun 0 while scanning, scan aborted Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdk: 71687372 512-byte hdwr sectors (36704 MB) sdk: Write Protect is off sdk: Mode Sense: ab 00 10 08 SCSI device sdk: drive cache: write back w/ FUA SCSI device sdk: 71687372 512-byte hdwr sectors (36704 MB) sdk: Write Protect is off sdk: Mode Sense: ab 00 10 08 SCSI device sdk: drive cache: write back w/ FUA sdk: unknown partition table sd 2:0:8:0: Attached scsi disk sdk sd 2:0:8:0: Attached scsi generic sg12 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 kobject_add failed for 2:0:8:0 with -EEXIST, don't try to register things with the same name in the same directory. Call Trace: [<a000000100012880>] show_stack+0x40/0xa0 sp=e0000030148a7a80 bsp=e0000030148a13c8 [<a000000100012910>] dump_stack+0x30/0x60 sp=e0000030148a7c50 bsp=e0000030148a13b0 [<a0000001004080e0>] kobject_add+0x3a0/0x420 sp=e0000030148a7c50 bsp=e0000030148a1370 [<a0000001004e5330>] device_add+0xf0/0x620 sp=e0000030148a7c50 bsp=e0000030148a1328 [<a000000100566ea0>] scsi_sysfs_add_sdev+0x60/0x520 sp=e0000030148a7c50 bsp=e0000030148a12e0 [<a0000001005629d0>] scsi_probe_and_add_lun+0x11b0/0x1460 sp=e0000030148a7c50 bsp=e0000030148a1278 [<a000000100564100>] __scsi_scan_target+0x780/0xb60 sp=e0000030148a7c70 bsp=e0000030148a1220 [<a000000100564a90>] scsi_scan_target+0xd0/0x100 sp=e0000030148a7cd0 bsp=e0000030148a11c8 [<a000000100571b80>] fc_scsi_scan_rport+0xe0/0x160 sp=e0000030148a7cd0 bsp=e0000030148a11a0 [<a0000001000ca460>] run_workqueue+0x1c0/0x280 sp=e0000030148a7cd0 bsp=e0000030148a1160 [<a0000001000cba50>] worker_thread+0x1d0/0x260 sp=e0000030148a7cd0 bsp=e0000030148a1130 [<a0000001000d3660>] kthread+0x220/0x2a0 sp=e0000030148a7d50 bsp=e0000030148a10e8 [<a000000100010e30>] kernel_thread_helper+0xd0/0x100 sp=e0000030148a7e30 bsp=e0000030148a10c0 [<a000000100009140>] start_kernel_thread+0x20/0x40 sp=e0000030148a7e30 bsp=e0000030148a10c0 error 1 scsi 2:0:8:0: Unexpected response from lun 0 while scanning, scan aborted Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdl: 71687372 512-byte hdwr sectors (36704 MB) sdl: Write Protect is off sdl: Mode Sense: ab 00 10 08 SCSI device sdl: drive cache: write back w/ FUA SCSI device sdl: 71687372 512-byte hdwr sectors (36704 MB) sdl: Write Protect is off sdl: Mode Sense: ab 00 10 08 SCSI device sdl: drive cache: write back w/ FUA sdl: sdl1 sdl9 sdl11 sd 2:0:14:0: Attached scsi disk sdl sd 2:0:14:0: Attached scsi generic sg17 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdm: 71687372 512-byte hdwr sectors (36704 MB) sdm: Write Protect is off sdm: Mode Sense: ab 00 10 08 SCSI device sdm: drive cache: write back w/ FUA SCSI device sdm: 71687372 512-byte hdwr sectors (36704 MB) sdm: Write Protect is off sdm: Mode Sense: ab 00 10 08 SCSI device sdm: drive cache: write back w/ FUA sdm: sdm1 sdm9 sdm11 sd 2:0:13:0: Attached scsi disk sdm sd 2:0:13:0: Attached scsi generic sg18 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdn: 71687372 512-byte hdwr sectors (36704 MB) sdn: Write Protect is off sdn: Mode Sense: ab 00 10 08 SCSI device sdn: drive cache: write back w/ FUA SCSI device sdn: 71687372 512-byte hdwr sectors (36704 MB) sdn: Write Protect is off sdn: Mode Sense: ab 00 10 08 SCSI device sdn: drive cache: write back w/ FUA sdn: sdn1 sdn9 sdn11 sd 2:0:15:0: Attached scsi disk sdn sd 2:0:15:0: Attached scsi generic sg19 type 0 duck /root# sync duck /root# sync duck /root# !md mdadm --stop /dev/md0 md: md0 stopped. md: unbind<sdi> md: export_rdev(sdi) md: unbind<sdf> md: export_rdev(sdf) duck /root# lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:d8:6c NPort x131bce Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:e9:fa NPort x131bd1 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:d8:51 NPort x131bd2 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:1a:41 NPort x131bd3 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1d:e9:80 NPort x131bd4 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:2d NPort x131bd5 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:db NPort x131bd6 Data: x8 x7 x0 lpfc 0001:00:02.0: 0:0203 Nodev timeout on WWPN 22:0:0:11:c6:1e:3a:fb NPort x131bd9 Data: x8 x7 x0 duck /root# rport-2:0-8: blocked FC remote port time out: removing target and saving binding rport-2:0-6: blocked FC remote port time out: removing target and saving binding rport-2:0-9: blocked FC remote port time out: removing target and saving binding rport-2:0-7: blocked FC remote port time out: removing target and saving binding rport-2:0-10: blocked FC remote port time out: removing target and saving binding rport-2:0-16: blocked FC remote port time out: removing target and saving binding rport-2:0-15: blocked FC remote port time out: removing target and saving binding rport-2:0-17: blocked FC remote port time out: removing target and saving binding Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA SCSI device sde: 71687372 512-byte hdwr sectors (36704 MB) sde: Write Protect is off sde: Mode Sense: ab 00 10 08 SCSI device sde: drive cache: write back w/ FUA sde: sde1 sde9 sde11 sd 2:0:6:0: Attached scsi disk sde sd 2:0:6:0: Attached scsi generic sg8 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdf: 71687372 512-byte hdwr sectors (36704 MB) sdf: Write Protect is off sdf: Mode Sense: ab 00 10 08 SCSI device sdf: drive cache: write back w/ FUA SCSI device sdf: 71687372 512-byte hdwr sectors (36704 MB) sdf: Write Protect is off sdf: Mode Sense: ab 00 10 08 SCSI device sdf: drive cache: write back w/ FUA sdf: sdf1 sdf9 sdf11 sd 2:0:4:0: Attached scsi disk sdf sd 2:0:4:0: Attached scsi generic sg9 type 0 Vendor: SGI Model: ST336753FC Rev: 2701 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdg: 71687372 512-byte hdwr sectors (36704 MB) sdg: Write Protect is off sdg: Mode Sense: ab 00 10 08 SCSI device sdg: drive cache: write back w/ FUA SCSI device sdg: 71687372 512-byte hdwr sectors (36704 MB) sdg: Write Protect is off sdg: Mode Sense: ab 00 10 08 SCSI device sdg: drive cache: write back w/ FUA sdg: sdg1 sdg9 sdg11 BUG: soft lockup detected on CPU#1! Call Trace: [<a000000100012880>] show_stack+0x40/0xa0 sp=e0000030148a7850 bsp=e0000030148a1800 [<a000000100012910>] dump_stack+0x30/0x60 sp=e0000030148a7a20 bsp=e0000030148a17e0 [<a0000001000f4c90>] softlockup_tick+0x1f0/0x220 sp=e0000030148a7a20 bsp=e0000030148a17a0 [<a0000001000bb350>] run_local_timers+0x30/0x60 sp=e0000030148a7a20 bsp=e0000030148a1788 [<a0000001000bb400>] update_process_times+0x80/0x100 sp=e0000030148a7a20 bsp=e0000030148a1758 [<a0000001000345d0>] timer_interrupt+0x110/0x2e0 sp=e0000030148a7a20 bsp=e0000030148a1718 [<a0000001000f5300>] handle_IRQ_event+0xa0/0x140 sp=e0000030148a7a20 bsp=e0000030148a16d8 [<a0000001000f54d0>] __do_IRQ+0x130/0x3e0 sp=e0000030148a7a20 bsp=e0000030148a1690 [<a0000001000102b0>] ia64_handle_irq+0xb0/0x160 sp=e0000030148a7a20 bsp=e0000030148a1660 [<a00000010000bb20>] ia64_leave_kernel+0x0/0x290 sp=e0000030148a7a20 bsp=e0000030148a1660 [<a000000100051e90>] smp_call_function+0x290/0x340 sp=e0000030148a7bf0 bsp=e0000030148a1600 [<a0000001000aeae0>] on_each_cpu+0x60/0x140 sp=e0000030148a7c10 bsp=e0000030148a15c0 [<a00000010015eea0>] invalidate_bdev+0x40/0x80 sp=e0000030148a7c10 bsp=e0000030148a15a0 [<a00000010016c5b0>] kill_bdev+0x30/0x80 sp=e0000030148a7c10 bsp=e0000030148a1580 [<a00000010016d520>] __blkdev_put+0xa0/0x420 sp=e0000030148a7c10 bsp=e0000030148a1538 [<a00000010016d930>] blkdev_put+0x30/0x60 sp=e0000030148a7c20 bsp=e0000030148a1518 [<a0000001001f1d70>] register_disk+0x2b0/0x3a0 sp=e0000030148a7c20 bsp=e0000030148a14e0 [<a0000001003df8c0>] add_disk+0xa0/0xe0 sp=e0000030148a7c20 bsp=e0000030148a14c0 [<a0000001005a98d0>] sd_probe+0x6f0/0x7a0 sp=e0000030148a7c20 bsp=e0000030148a1468 [<a0000001004e9640>] driver_probe_device+0x100/0x1e0 sp=e0000030148a7c30 bsp=e0000030148a1430 [<a0000001004e9750>] __device_attach+0x30/0x60 sp=e0000030148a7c30 bsp=e0000030148a1408 [<a0000001004e8640>] bus_for_each_drv+0x80/0x120 sp=e0000030148a7c30 bsp=e0000030148a13c8 [<a0000001004e9820>] device_attach+0xa0/0x100 sp=e0000030148a7c50 bsp=e0000030148a1398 [<a0000001004e7f50>] bus_attach_device+0x30/0x60 sp=e0000030148a7c50 bsp=e0000030148a1370 [<a0000001004e5630>] device_add+0x3f0/0x620 sp=e0000030148a7c50 bsp=e0000030148a1328 [<a000000100566ea0>] scsi_sysfs_add_sdev+0x60/0x520 sp=e0000030148a7c50 bsp=e0000030148a12e0 [<a0000001005629d0>] scsi_probe_and_add_lun+0x11b0/0x1460 sp=e0000030148a7c50 bsp=e0000030148a1278 [<a000000100563af0>] __scsi_scan_target+0x170/0xb60 sp=e0000030148a7c70 bsp=e0000030148a1220 [<a000000100564a90>] scsi_scan_target+0xd0/0x100 sp=e0000030148a7cd0 bsp=e0000030148a11c8 [<a000000100571b80>] fc_scsi_scan_rport+0xe0/0x160 sp=e0000030148a7cd0 bsp=e0000030148a11a0 [<a0000001000ca460>] run_workqueue+0x1c0/0x280 sp=e0000030148a7cd0 bsp=e0000030148a1160 [<a0000001000cba50>] worker_thread+0x1d0/0x260 sp=e0000030148a7cd0 bsp=e0000030148a1130 [<a0000001000d3660>] kthread+0x220/0x2a0 sp=e0000030148a7d50 bsp=e0000030148a10e8 [<a000000100010e30>] kernel_thread_helper+0xd0/0x100 sp=e0000030148a7e30 bsp=e0000030148a10c0 [<a000000100009140>] start_kernel_thread+0x20/0x40 sp=e0000030148a7e30 bsp=e0000030148a10c0 Entering kdb (current=0xe00000300f4e8000, pid 5342) on processor 0 due to Keyboard Entry [0]kdb> ps 84 sleeping system daemon (state M) processes suppressed Task Addr Pid Parent [*] cpu State Thread Command 0xe00000300f4e8000 5342 1 1 0 R 0xe00000300f4e8330 *nscd 0xe0000030148a0000 1946 19 1 1 R 0xe0000030148a0330 scsi_wq_2 0xe000003011bd8000 6403 2368 0 2 R 0xe000003011bd8330 udevd 0xe000003010bb8000 6398 6395 1 3 R 0xe000003010bb8330 vol_id [0]kdb> btp 6398 Stack traceback for pid 6398 0xe000003010bb8000 6398 6395 1 3 R 0xe000003010bb8330 vol_id 0xa0000001006fe2f0 lock_kernel+0x1b0 args (0x100000000, 0xa00000010016d4d0, 0x48b, 0x20000000002b4030) 0xa00000010016d4d0 __blkdev_put+0x50 args (0xe00000b079b5fc00, 0x0, 0x40d, 0xe00000b078f23b00, 0xe00000b079b5fcd0) 0xa00000010016d930 blkdev_put+0x30 args (0xe00000b079b5fc00, 0xa00000010016f4c0, 0x307, 0xb0) 0xa00000010016f4c0 blkdev_close+0x60 args (0xe0000034f5b2c498, 0xe00000b0788bd580, 0xe00000b079b5fc00, 0xa00000010015b040, 0x40d) 0xa00000010015b040 __fput+0x1a0 args (0xe00000b0788bd580, 0x10, 0xe0000034f5b2c498, 0xe000003015cdcb98, 0xe00000b07bad1b80) 0xa00000010015b2e0 fput+0x40 args (0xe00000b0788bd580, 0xa000000100154ab0, 0x308, 0x308) 0xa000000100154ab0 filp_close+0x110 args (0xe00000b0788bd580, 0xe0000034f725f400, 0x0, 0xa000000100154c20, 0x791) 0xa000000100154c20 sys_close+0x140 args (0x3, 0x600000000000da58, 0x6000000000010010, 0x6000000000021a10, 0x4000000000002f10) 0xa00000010000b980 ia64_ret_from_syscall args (0x3, 0x600000000000da58, 0x6000000000010010, 0x6000000000021a10, 0x4000000000002f10) 0xa000000000010620 __kernel_syscall_via_break args (0x3, 0x600000000000da58, 0x6000000000010010, 0x6000000000021a10, 0x4000000000002f10) - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
