Panic when rebooting target server testing srp on 5.0.0-rc2

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Hello Bart, I hope all is well with you.

Quick question
preparing to test v5.1-rc2 SRP, my usual method is first validate the
prior kernel I had in place.
This had passed tests previously (5.0.0-rc2) but I had not run the
target server reboot test, just the disconnect tests.

Today with mapped SRP devices I rebooted the target server and the
client panicked.

Its been a while and I have been so busy that have not kept up with all
the fixes. Is this a known issue.

Thanks
Laurence

5414228.917507] scsi host2: ib_srp: Path record query failed: sgid
fe80:0000:0000:0000:7cfe:9003:0072:6ed3, dgid
fe80:0000:0000:0000:7cfe:9003:0072:6e4f, pkey 0xffff, service_id
0x7cfe900300726e4e
[5414229.014355] scsi host2: reconnect attempt 7 failed (-110)
[5414239.318161] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318165] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318167] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318168] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318170] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318172] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318173] scsi host2: ib_srp: Sending CM DREQ failed
[5414239.318175] scsi host2: ib_srp: Sending CM DREQ failed
[5414243.670072] scsi host2: ib_srp: Got failed path rec status -110
[5414243.702179] scsi host2: ib_srp: Path record query failed: sgid
fe80:0000:0000:0000:7cfe:9003:0072:6ed3, dgid
fe80:0000:0000:0000:7cfe:9003:0072:6e4f, pkey 0xffff, service_id
0x7cfe900300726e4e
[5414243.799313] scsi host2: reconnect attempt 8 failed (-110)
[5414247.510115] scsi host1: ib_srp: Sending CM REQ failed
[5414247.510140] scsi host1: reconnect attempt 1 failed (-104)
[5414247.849078] BUG: unable to handle kernel NULL pointer dereference
at 00000000000000b8
[5414247.893793] #PF error: [normal kernel read fault]
[5414247.921839] PGD 0 P4D 0 
[5414247.937280] Oops: 0000 [#1] SMP PTI
[5414247.958332] CPU: 4 PID: 7773 Comm: kworker/4:1H Kdump: loaded
Tainted: G          I       5.0.0-rc2+ #2
[5414248.012856] Hardware name: HP ProLiant DL380 G7, BIOS P67
08/16/2015
[5414248.026174] device-mapper: multipath: Failing path 8:48.


[5414248.050003] Workqueue: kblockd blk_mq_run_work_fn
[5414248.108378] RIP: 0010:blk_mq_dispatch_rq_list+0xc9/0x590
[5414248.139724] Code: 0f 85 c2 04 00 00 83 44 24 28 01 48 8b 45 00 48
39 c5 0f 84 ea 00 00 00 48 8b 5d 00 80 3c 24 00 4c 8d 6b b8 4c 8b 63 c8
75 25 <49> 8b 84 24 b8 00 00 00 48 8b 40 40 48 8b 40 10 48 85 c0 74 10
4c
[5414248.246176] RSP: 0018:ffffb1cd8760fd90 EFLAGS: 00010246
[5414248.275599] RAX: ffffa049d67a1308 RBX: ffffa049d67a1308 RCX:
0000000000000004
[5414248.316090] RDX: 0000000000000000 RSI: ffffb1cd8760fe20 RDI:
ffffa0552ca08000
[5414248.356884] RBP: ffffb1cd8760fe20 R08: 0000000000000000 R09:
8080808080808080
[5414248.397632] R10: 0000000000000001 R11: 0000000000000001 R12:
0000000000000000
[5414248.439323] R13: ffffa049d67a12c0 R14: 0000000000000000 R15:
ffffa0552ca08000
[5414248.481743] FS:  0000000000000000(0000) GS:ffffa04a37880000(0000)
knlGS:0000000000000000
[5414248.528310] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[5414248.561779] CR2: 00000000000000b8 CR3: 0000000e9d40e004 CR4:
00000000000206e0
[5414248.602420] Call Trace:
[5414248.616660]  blk_mq_sched_dispatch_requests+0x15c/0x180
[5414248.647066]  __blk_mq_run_hw_queue+0x5f/0xf0
[5414248.672633]  process_one_work+0x171/0x370
[5414248.695443]  worker_thread+0x49/0x3f0
[5414248.716730]  kthread+0xf8/0x130
[5414248.735085]  ? max_active_store+0x80/0x80
[5414248.758569]  ? kthread_bind+0x10/0x10
[5414248.779953]  ret_from_fork+0x35/0x40

[5414248.801005] Modules linked in: ib_isert iscsi_target_mod
target_core_mod ib_srp rpcrdma scsi_transport_srp rdma_ucm ib_iser
ib_ipoib ib_umad rdma_cm libiscsi iw_cm scsi_transport_iscsi ib_cm
sunrpc mlx5_ib ib_uverbs ib_core intel_powerclamp coretemp kvm_intel
kvm irqbypass ipmi_ssif crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel iTCO_wdt crypto_simd cryptd gpio_ich
iTCO_vendor_support glue_helper joydev ipmi_si dm_service_time pcspkr
ipmi_devintf hpilo hpwdt sg ipmi_msghandler acpi_power_meter lpc_ich
i7core_edac pcc_cpufreq dm_multipath ip_tables xfs libcrc32c radeon
sd_mod i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops ttm drm mlx5_core crc32c_intel serio_raw i2c_core hpsa bnx2
scsi_transport_sas mlxfw devlink dm_mirror dm_region_hash dm_log dm_mod
[5414249.199354] CR2: 00000000000000b8





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