2012/11/26 Greg KH [off-list ref]:

If you use a kernel.org released kernel, then we can help you out.

Best of luck,

Okay. I'm use kernel from you git tree (3.0.53 stable branch). But
have no luck. Ahen i'm force reboot storage server multipath -ll on
initiator side locked.
echo w > /proc/sysrq-trigger says:

[  729.936560] SysRq : Show Blocked State
[  729.936669]   task                        PC stack   pid father
[  729.936704] multipathd      D 0000000000000083     0  8152      1
0x00000000
[  729.936709]  ffff880115b97a68 0000000000000282 0000000100000000
ffff880115b979e8
[  729.936713]  ffff880115b96010 ffff880115b97a30 ffff880115b94400
ffff880115b94400
[  729.936718]  ffff880115b94400 ffff880115b97fd8 ffff880115b97fd8
ffff880115b94400
[  729.936722] Call Trace:
[  729.936760]  [<ffffffffa017b2ad>]
scsi_block_when_processing_errors+0xcd/0xf0 [scsi_mod]
[  729.936776]  [<ffffffffa04b7cf8>] sd_open+0xb8/0x1f0 [sd_mod]
[  729.936797]  [<ffffffff80160bb8>] __blkdev_get+0x388/0x460
[  729.936803]  [<ffffffff8016113a>] blkdev_get+0x5a/0x1f0
[  729.936808]  [<ffffffff80161303>] blkdev_get_by_dev+0x33/0x70
[  729.936819]  [<ffffffffa00ffe43>] open_dev+0x33/0xb0 [dm_mod]
[  729.936835]  [<ffffffffa01000f1>] __table_get_device+0x231/0x2c0 [dm_mod]
[  729.936849]  [<ffffffffa03719d7>] parse_path+0xe7/0x380 [dm_multipath]
[  729.936859]  [<ffffffffa0371de1>] parse_priority_group+0x171/0x220
[dm_multipath]
[  729.936868]  [<ffffffffa03720c2>] multipath_ctr+0x232/0x32c [dm_multipath]
[  729.936879]  [<ffffffffa0100a63>] dm_table_add_target+0x193/0x260 [dm_mod]
[  729.936895]  [<ffffffffa0102cb9>] table_load+0xc9/0x2c0 [dm_mod]
[  729.936914]  [<ffffffffa0103f8d>] ctl_ioctl+0x1ed/0x270 [dm_mod]
[  729.936934]  [<ffffffffa010401e>] dm_ctl_ioctl+0xe/0x20 [dm_mod]
[  729.936950]  [<ffffffff8013b613>] do_vfs_ioctl+0x93/0x3f0
[  729.936955]  [<ffffffff8013ba11>] sys_ioctl+0xa1/0xb0
[  729.936962]  [<ffffffff80402233>] system_call_fastpath+0x16/0x1b
[  729.936970]  [<00007f73a8679fa7>] 0x7f73a8679fa6
[  729.936981] scsi_eh_2       D 0000000000000000     0 30416      2 0x00000000
[  729.936985]  ffff880120ff3b70 0000000000000246 0000000000000026
ffff880120ff3af0
[  729.936989]  ffff880120ff2010 ffff880120ff3b38 ffff88011f616480
ffff88011f616480
[  729.936993]  ffff88011f616480 ffff880120ff3fd8 ffff880120ff3fd8
ffff88011f616480
[  729.936997] Call Trace:
[  729.937004]  [<ffffffff803f804d>] schedule_timeout+0x21d/0x2c0
[  729.937010]  [<ffffffff803f6f35>] wait_for_common+0xe5/0x210
[  729.937018]  [<ffffffffa037b75c>] srp_disconnect_target+0x18c/0x210 [ib_srp]
[  729.937029]  [<ffffffffa037cbe0>] srp_reconnect_target+0x110/0x3a0 [ib_srp]
[  729.937042]  [<ffffffffa037cea9>] srp_reset_host+0x39/0x50 [ib_srp]
[  729.937059]  [<ffffffffa017898d>] scsi_try_host_reset+0x4d/0x120 [scsi_mod]
[  729.937077]  [<ffffffffa017a604>] scsi_eh_host_reset+0x44/0x170 [scsi_mod]
[  729.937096]  [<ffffffffa017ab81>] scsi_eh_ready_devs+0x91/0x130 [scsi_mod]
[  729.937115]  [<ffffffffa017aefd>] scsi_unjam_host+0xfd/0x200 [scsi_mod]
[  729.937134]  [<ffffffffa017b188>] scsi_error_handler+0x188/0x1e0 [scsi_mod]
[  729.937147]  [<ffffffff80067ae6>] kthread+0x96/0xa0
[  729.937153]  [<ffffffff80402bd4>] kernel_thread_helper+0x4/0x10
[  729.937156] scsi_eh_3       D 0000000000000000     0 30421      2 0x00000000
[  729.937161]  ffff88010d0d3b70 0000000000000246 0000000000000000
ffff88010d0d3af0
[  729.937165]  ffff88010d0d2010 ffff88010d0d3b38 ffff88011166a180
ffff88011166a180
[  729.937169]  ffff88011166a180 ffff88010d0d3fd8 ffff88010d0d3fd8
ffff88011166a180
[  729.937173] Call Trace:

[  729.937173] Call Trace:
[  729.937178]  [<ffffffff803f804d>] schedule_timeout+0x21d/0x2c0
[  729.937183]  [<ffffffff803f6f35>] wait_for_common+0xe5/0x210
[  729.937190]  [<ffffffffa037b75c>] srp_disconnect_target+0x18c/0x210 [ib_srp]
[  729.937201]  [<ffffffffa037cbe0>] srp_reconnect_target+0x110/0x3a0 [ib_srp]
[  729.937213]  [<ffffffffa037cea9>] srp_reset_host+0x39/0x50 [ib_srp]
[  729.937230]  [<ffffffffa017898d>] scsi_try_host_reset+0x4d/0x120 [scsi_mod]
[  729.937248]  [<ffffffffa017a604>] scsi_eh_host_reset+0x44/0x170 [scsi_mod]
[  729.937267]  [<ffffffffa017ab81>] scsi_eh_ready_devs+0x91/0x130 [scsi_mod]
[  729.937286]  [<ffffffffa017aefd>] scsi_unjam_host+0xfd/0x200 [scsi_mod]
[  729.937306]  [<ffffffffa017b188>] scsi_error_handler+0x188/0x1e0 [scsi_mod]
[  729.937317]  [<ffffffff80067ae6>] kthread+0x96/0xa0
[  729.937322]  [<ffffffff80402bd4>] kernel_thread_helper+0x4/0x10
[  729.937333] multipath       D 0000000000000001     0  5230   5056 0x00000004
[  729.937337]  ffff880128467c18 0000000000000246 0000000000000001
ffff880128467b98
[  729.937341]  ffff880128466010 ffff880128467be0 ffff8800a297a5c0
ffff8800a297a5c0
[  729.937345]  ffff8800a297a5c0 ffff880128467fd8 ffff880128467fd8
ffff8800a297a5c0
[  729.937349] Call Trace:
[  729.937354]  [<ffffffff803f7c1c>] io_schedule+0x9c/0xf0
[  729.937361]  [<ffffffff8016ff7f>] wait_for_all_aios+0xff/0x180
[  729.937366]  [<ffffffff80170396>] exit_aio+0x46/0xb0
[  729.937372]  [<ffffffff80042edd>] mmput+0x1d/0x100
[  729.937378]  [<ffffffff8004768c>] exit_mm+0x12c/0x170
[  729.937384]  [<ffffffff80048aca>] do_exit+0x18a/0x440
[  729.937389]  [<ffffffff8004911f>] do_group_exit+0x3f/0xe0
[  729.937395]  [<ffffffff8005b4f3>] get_signal_to_deliver+0x2a3/0x530
[  729.937403]  [<ffffffff80006d81>] do_signal+0x71/0x1b0
[  729.937408]  [<ffffffff80006f48>] do_notify_resume+0x88/0xa0
[  729.937413]  [<ffffffff804024c3>] int_signal+0x12/0x17
[  729.937421]  [<00007fb5b9e5e6a4>] 0x7fb5b9e5e6a3
[  729.937426] Sched Debug Version: v0.10, 3.0.53 #1



--
Vasiliy Tolstov,
Clodo.ru
e-mail: v.tolstov@selfip.ru
jabber: vase@selfip.ru