代码拉取完成，页面将自动刷新
测试日志：
srp/002 (File I/O on top of multipath concurrently with logout and login (mq))
[ 15.265517] run blktests srp/002 at 2022-06-26 08:29:47
[ 15.700998] lo speed is unknown, defaulting to 1000
[ 15.702315] lo speed is unknown, defaulting to 1000
[ 15.703550] lo speed is unknown, defaulting to 1000
[ 15.711004] lo speed is unknown, defaulting to 1000
[ 15.760552] scsi_debug:scsi_debug_init: dif_storep 524288 bytes @ 00000000abb7527b
[ 15.765837] sd 3:0:0:0: Power-on or device reset occurred
[ 15.908308] lo speed is unknown, defaulting to 1000
[ 16.655328] sd 4:0:0:0: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatical
[ 16.658615] sd 4:0:0:1: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatical
[ 16.666159] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 16.667834] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 16.669108] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 16.718968] ib_srp: QP creation failed for dev rxe1: -22
[ 16.738059] ib_srp: QP creation failed for dev rxe1: -22
[ 22.071292] device-mapper: multipath: Failing path 8:32.
[ 27.135556] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 27.142852] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 27.151142] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 27.232340] ib_srp: QP creation failed for dev rxe1: -22
[ 27.256096] ib_srp: QP creation failed for dev rxe1: -22
[ 32.373096] srpt_recv_done: 502 callbacks suppressed
[ 34.349054] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 34.362998] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 34.367792] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 34.435274] ib_srp: QP creation failed for dev rxe1: -22
[ 34.453051] ib_srp: QP creation failed for dev rxe1: -22
[ 39.568037] srpt_recv_done: 502 callbacks suppressed
[ 41.540706] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 41.544740] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 41.549333] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 41.659859] ib_srp: QP creation failed for dev rxe1: -22
[ 41.671370] ib_srp: QP creation failed for dev rxe1: -22
[ 46.782981] srpt_recv_done: 502 callbacks suppressed
[ 47.748390] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 47.752500] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 47.756368] srpt/192.168.250.40: Unsupported SCSI Opcode 0xa3, sending CHECK_CONDITION.
[ 47.819097] ib_srp: QP creation failed for dev rxe1: -22
[ 47.830452] ib_srp: QP creation failed for dev rxe1: -22
[ 47.924356] ib_srp: QP creation failed for dev rxe1: -22
[ 47.941580] ib_srp: QP creation failed for dev rxe1: -22
[ 246.913304] INFO: task kworker/2:0:22 blocked for more than 120 seconds.
[ 246.915434] Not tainted 4.19.90-00008-g8fbfe2335d9 #36
[ 246.916312] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 246.917547] Call Trace:
[ 246.917972] ? __schedule+0x5c9/0xc60
[ 246.918550] schedule+0x5f/0x1c0
[ 246.919040] __rwsem_down_write_failed_common+0x2a2/0x840
[ 246.919878] ? generic_make_request+0xbb/0x690
[ 246.920565] ? rwsem_down_write_failed+0x17/0x20
[ 246.921279] rwsem_down_write_failed+0x17/0x20
[ 246.921938] call_rwsem_down_write_failed+0x13/0x20
[ 246.922677] down_write+0x39/0x50
[ 246.923190] __generic_file_fsync+0x57/0x130
[ 246.923854] ext4_sync_file+0x3cd/0x670
[ 246.924457] vfs_fsync_range+0x5c/0xb0
[ 246.925014] dio_complete+0x328/0x350
[ 246.925575] dio_aio_complete_work+0x1d/0x30
[ 246.926208] process_one_work+0x2cf/0x6f0
[ 246.926827] worker_thread+0x252/0x760
[ 246.927415] kthread+0x178/0x1e0
[ 246.927898] ? rescuer_thread+0x5c0/0x5c0
[ 246.928504] ? kthread_cancel_delayed_work_timer+0x70/0x70
[ 246.929354] ret_from_fork+0x35/0x40
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根据 https://syzkaller.appspot.com/bug?extid=831661966588c802aae9可知
kworker/0:7/17139 is trying to acquire lock:
ffff888077a89938 ((wq_completion)loop1){+.+.}-{0:0}, at: flush_workqueue+0xe1/0x13a0 kernel/workqueue.c:2824
but task is already holding lock:
ffffc9000fa07db8 ((work_completion)(&lo->rundown_work)){+.+.}-{0:0}, at: process_one_work+0x8c4/0x1650 kernel/workqueue.c:2282
根据sysbot描述，在flush_workqueue和work_completion上产生死锁。与栈信息相符。
fix commit 99eb8d694174c777558dc902d575d1997d5ca650("RDMA/ib_srp: Fix a deadlock") 已经合入
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