Re: [PATCH] scsi: sas: move scsi_remove_host call into sas_remove_host

From: John Garry
Date: Mon Apr 24 2017 - 09:39:41 EST

On 24/04/2017 11:09, John Garry wrote:
On 21/04/2017 13:11, Johannes Thumshirn wrote:
Move scsi_remove_host call into sas_remove_host and remove it from SAS
HBA
drivers, so we don't mess up the ordering. This solves an issue with
double
deleting sysfs entries that was introduced by the change of sysfs
behaviour
from commit bcdde7e ("sysfs: make __sysfs_remove_dir() recursive").

Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: James Bottomley <jejb@xxxxxxxxxxxxxxxxxx>
Cc: Jinpu Wang <jinpu.wang@xxxxxxxxxxxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>

For what it's worth:

Tested-by: John Garry <john.garry@xxxxxxxxxx> # On hisi_sas


I have actually tested this a little further and now I see an issue. Maybe it is related to the internal development kernel I am using or a pre-existing issue with our driver, but I doubt it.
This time I removed the WARN in sysfs_remove_group() [so the console is not bombarded] and ran repeated insmod/rmmod, and I see this sometimes:

root@(none)$
root@(none)$ insmod hisi_sas_v2_hw.ko
[ 2150.478485] scsi host6: hisi_sas
[ 2151.629343] scsi host7: hisi_sas
[ 2152.248410] hisi_sas_v2_hw HISI0162:01: phyup: phy0 link_rate=11
[ 2152.254424] hisi_sas_v2_hw HISI0162:01: phyup: phy1 link_rate=11
[ 2152.260422] hisi_sas_v2_hw HISI0162:01: phyup: phy2 link_rate=11
[ 2152.266421] hisi_sas_v2_hw HISI0162:01: phyup: phy3 link_rate=11
[ 2152.272419] hisi_sas_v2_hw HISI0162:01: phyup: phy4 link_rate=11
[ 2152.278416] hisi_sas_v2_hw HISI0162:01: phyup: phy5 link_rate=11
[ 2152.284413] hisi_sas_v2_hw HISI0162:01: phyup: phy6 link_rate=11
[ 2152.290410] hisi_sas_v2_hw HISI0162:01: phyup: phy7 link_rate=11
[ 2152.507431] ata3.00: ATA-8: HGST HUS724040ALA640, MFAOA8B0, max UDMA/133
[ 2152.514127] ata3.00: 7814037168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[ 2152.522726] ata3.00: configured for UDMA/133
[ 2152.574540] scsi 7:0:0:0: Direct-Access SanDisk LT0200MO P404 PQ: 0 ANSI: 6
[ 2152.835694] scsi 7:0:1:0: Direct-Access ATA HGST HUS724040AL A8B0 PQ: 0 ANSI: 5
[ 2152.873713] sd 7:0:1:0: [sdb] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 2152.881468] sd 7:0:1:0: [sdb] Write Protect is off
[ 2152.886274] sd 7:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2152.911092] scsi 7:0:2:0: Direct-Access SanDisk LT0200MO P404 PQ: 0 ANSI: 6
[ 2153.050599] sd 7:0:0:0: [sda] 390721968 512-byte logical blocks: (200 GB/186 GiB)
[ 2153.092625] sd 7:0:0:0: [sda] Write Protect is off
[ 2153.174641] sd 7:0:0:0: [sda] Write cache: disabled, read cache: disabled, supports DPO and FUA
[ 2153.209183] scsi 7:0:3:0: Direct-Access SanDisk LT0200MO P404 PQ: 0 ANSI: 6
[ 2153.387054] sd 7:0:2:0: [sdc] 390721968 512-byte logical blocks: (200 GB/186 GiB)
[ 2153.429080] sd 7:0:2:0: [sdc] Write Protect is off
[ 2153.507273] scsi 7:0:4:0: Direct-Access SanDisk LT0200MO P404 PQ: 0 ANSI: 6
[ 2153.515382] sd 7:0:2:0: [sdc] Write cache: disabled, read cache: disabled, supports DPO and FUA
[ 2153.685254] sd 7:0:3:0: [sdd] 390721968 512-byte logical blocks: (200 GB/186 GiB)
[ 2153.727267] sd 7:0:3:0: [sdd] Write Protect is off
[ 2153.805266] scsi 7:0:5:0: Direct-Access SanDisk LT0200MO P404 PQ: 0 ANSI: 6
[ 2153.813359] sd 7:0:3:0: [sdd] Write cache: disabled, read cache: disabled, supports DPO and FUA
[ 2153.983165] sd 7:0:4:0: [sde] 390721968 512-byte logical blocks: (200 GB/186 GiB)
[ 2154.025158] sd 7:0:4:0: [sde] Write Protect is off
[ 2154.066761] scsi 7:0:6:0: Enclosure 12G SAS Expander RevB PQ: 0 ANSI: 6
[ 2154.107141] sd 7:0:4:0: [sde] Write cache: disabled, read cache: disabled, supports DPO and FUA
[ 2154.124866] scsi host8: hisi_sas
[ 2154.281354] sd 7:0:5:0: [sdf] 390721968 512-byte logical blocks: (200 GB/186 GiB)
[ 2154.323385] sd 7:0:5:0: [sdf] Write Protect is off
[ 2154.405404] sd 7:0:5:0: [sdf] Write cache: disabled, read cache: disabled, supports DPO and FUA
[ 2154.409289] sd 7:0:0:0: [sda] Attached SCSI disk
[ 2154.745722] sd 7:0:2:0: [sdc] Attached SCSI disk
[ 2155.044051] sd 7:0:3:0: [sdd] Attached SCSI disk

root@(none)$
root@(none)$ [ 2155.341986] sd 7:0:4:0: [sde] Attached SCSI disk

root@(none)$
root@(none)$ [ 2155.640217] sd 7:0:5:0: [sdf] Attached SCSI disk

root@(none)$
root@(none)$ rmmod hisi_sas_v2_hw.ko
[ 2158.679637] hisi_sas_v2_hw HISI0162:01: found dev[7:1] is gone
[ 2161.587449] sdb: sdb1 sdb2
[ 2161.590253] kobject_add_internal failed for sdb1 (error: -2 parent: sdb)
[ 2161.596954] ------------[ cut here ]------------
[ 2161.601562] WARNING: CPU: 0 PID: 2150 at lib/kobject.c:244 kobject_add_internal+0xdc/0x298
[ 2161.609811] Modules linked in: hisi_sas_v2_hw(-) hisi_sas_main [last unloaded: hisi_sas_v2_hw]
[ 2161.618412]
[ 2161.619893] CPU: 0 PID: 2150 Comm: kworker/u129:6 Tainted: G W 4.11.0-rc1-13718-gb5b0d57-dirty #1584
[ 2161.630138] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.12 Release 02/27/2017
[ 2161.639345] Workqueue: events_unbound async_run_entry_fn
[ 2161.644644] task: ffff8017b2240000 task.stack: ffff8017b223c000
[ 2161.650550] PC is at kobject_add_internal+0xdc/0x298
[ 2161.655501] LR is at kobject_add_internal+0xdc/0x298
[ 2161.660452] pc : [<ffff000008391190>] lr : [<ffff000008391190>] pstate: 60000145
[ 2161.667833] sp : ffff8017b223f980
[ 2161.671134] x29: ffff8017b223f980 x28: ffff8017c3946400
[ 2161.676434] x27: 000000000c800000 x26: ffff00000926a095
[ 2161.681733] x25: 0000000000000800 x24: 0000000000000001
[ 2161.687032] x23: ffff8017b1f71280 x22: ffff8017b27be088
[ 2161.692332] x21: 00000000fffffffe x20: ffff8017b27be088
[ 2161.697631] x19: ffff8017c3946438 x18: 0000000000000000
[ 2161.702930] x17: 0000ffff8c4cb0c0 x16: ffff0000081f3d78
[ 2161.708229] x15: 0000000000000000 x14: 0000000000000000
[ 2161.713528] x13: 0000000000000000 x12: 0000000000000020
[ 2161.718827] x11: ffff000008eeba58 x10: 0000000000000000
[ 2161.724126] x9 : 000000000000060e x8 : 20322d203a726f72
[ 2161.729426] x7 : ffff000008df9e08 x6 : ffff8017fbe7cbd0
[ 2161.734725] x5 : 0000000000000000 x4 : 0000000000000000
[ 2161.740024] x3 : ffffffffffffffff x2 : ffff000008e11e60
[ 2161.745323] x1 : 0000000000000000 x0 : 000000000000003c
[ 2161.750622]
[ 2161.752100] ---[ end trace 5f225d19a45cb6b2 ]---
[ 2161.756703] Call trace:
[ 2161.759137] Exception stack(0xffff8017b223f7b0 to 0xffff8017b223f8e0)
[ 2161.765563] f7a0: ffff8017c3946438 0001000000000000
[ 2161.773379] f7c0: ffff8017b223f980 ffff000008391190 ffff000008bd1c80 0000000000000000
[ 2161.781194] f7e0: ffff8017b1f71280 0000000000000001 0000000000000800 ffff00000926a095
[ 2161.789009] f800: 000000000c800000 ffff8017c3946400 0000000000000140 0000000000000000
[ 2161.796824] f820: ffff8017b223f980 ffff8017b223f980 ffff8017b223f940 00000000ffffffc8
[ 2161.804640] f840: ffff8017b223f870 ffff00000810d7ec 000000000000003c 0000000000000000
[ 2161.812455] f860: ffff000008e11e60 ffffffffffffffff 0000000000000000 0000000000000000
[ 2161.820270] f880: ffff8017fbe7cbd0 ffff000008df9e08 20322d203a726f72 000000000000060e
[ 2161.828085] f8a0: 0000000000000000 ffff000008eeba58 0000000000000020 0000000000000000
[ 2161.835901] f8c0: 0000000000000000 0000000000000000 ffff0000081f3d78 0000ffff8c4cb0c0
[ 2161.843717] [<ffff000008391190>] kobject_add_internal+0xdc/0x298
[ 2161.849709] [<ffff0000083915bc>] kobject_add+0x90/0xdc
[ 2161.854835] [<ffff00000854bc00>] device_add+0xdc/0x54c
[ 2161.859960] [<ffff00000837baec>] add_partition+0x25c/0x3bc
[ 2161.865432] [<ffff00000837be4c>] rescan_partitions+0x200/0x39c
[ 2161.871252] [<ffff00000822b940>] __blkdev_get+0x2b0/0x39c
[ 2161.876636] [<ffff00000822bba0>] blkdev_get+0x174/0x2f0
[ 2161.881847] [<ffff00000837a5b8>] device_add_disk+0x3c8/0x434
[ 2161.887494] [<ffff0000085a2de4>] sd_probe_async+0xdc/0x1bc
[ 2161.892966] [<ffff0000080df85c>] async_run_entry_fn+0x40/0x108
[ 2161.898786] [<ffff0000080d6324>] process_one_work+0x138/0x2d8
[ 2161.904518] [<ffff0000080d651c>] worker_thread+0x58/0x424
[ 2161.909904] [<ffff0000080dc32c>] kthread+0xf4/0x120
[ 2161.914768] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
[ 2161.920083] sdb: p1 could not be added: 2
[ 2161.924177] kobject_add_internal failed for sdb2 (error: -2 parent: sdb)
[ 2161.930872] ------------[ cut here ]------------
[ 2161.935477] WARNING: CPU: 0 PID: 2150 at lib/kobject.c:244 kobject_add_internal+0xdc/0x298
[ 2161.943725] Modules linked in: hisi_sas_v2_hw(-) hisi_sas_main [last unloaded: hisi_sas_v2_hw]
[ 2161.952325]
[ 2161.953804] CPU: 0 PID: 2150 Comm: kworker/u129:6 Tainted: G W 4.11.0-rc1-13718-gb5b0d57-dirty #1584
[ 2161.964049] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.12 Release 02/27/2017
[ 2161.973254] Workqueue: events_unbound async_run_entry_fn
[ 2161.978553] task: ffff8017b2240000 task.stack: ffff8017b223c000
[ 2161.984459] PC is at kobject_add_internal+0xdc/0x298
[ 2161.989410] LR is at kobject_add_internal+0xdc/0x298
[ 2161.994360] pc : [<ffff000008391190>] lr : [<ffff000008391190>] pstate: 60000145
[ 2162.001741] sp : ffff8017b223f980
[ 2162.005042] x29: ffff8017b223f980 x28: ffff8017c3946400
[ 2162.010342] x27: 000000000c800000 x26: ffff00000926a115
[ 2162.015641] x25: 000000000c800800 x24: 0000000000000002
[ 2162.020940] x23: ffff8017b1f71280 x22: ffff8017b27be088
[ 2162.026239] x21: 00000000fffffffe x20: ffff8017b27be088
[ 2162.031538] x19: ffff8017c3946438 x18: 0000000000000000
[ 2162.036838] x17: 0000ffff8c4cb0c0 x16: ffff0000081f3d78
[ 2162.042137] x15: 0000000000000000 x14: 0000000000000000
[ 2162.047436] x13: 0000000000000000 x12: 0000000000000020
[ 2162.052735] x11: ffff000008eeba58 x10: 0000000000000000
[ 2162.058034] x9 : 0000000000000647 x8 : 29626473203a746e
[ 2162.063333] x7 : ffff000008df9e08 x6 : ffff8017fbe7cbd0
[ 2162.068632] x5 : 0000000000000000 x4 : 0000000000000000
[ 2162.073932] x3 : ffffffffffffffff x2 : ffff000008e11e60
[ 2162.079231] x1 : 0000000000000000 x0 : 000000000000003c
[ 2162.084530]
[ 2162.086008] ---[ end trace 5f225d19a45cb6b3 ]---
[ 2162.090611] Call trace:
[ 2162.093044] Exception stack(0xffff8017b223f7b0 to 0xffff8017b223f8e0)
[ 2162.099471] f7a0: ffff8017c3946438 0001000000000000
[ 2162.107286] f7c0: ffff8017b223f980 ffff000008391190 ffff000008bd1c80 0000000000000000
[ 2162.115102] f7e0: ffff8017b1f71280 0000000000000002 000000000c800800 ffff00000926a115
[ 2162.122917] f800: 000000000c800000 ffff8017c3946400 0000000000000140 0000000000000000
[ 2162.130732] f820: ffff8017b223f980 ffff8017b223f980 ffff8017b223f940 00000000ffffffc8
[ 2162.138547] f840: ffff8017b223f870 ffff00000810d7ec 000000000000003c 0000000000000000
[ 2162.146362] f860: ffff000008e11e60 ffffffffffffffff 0000000000000000 0000000000000000
[ 2162.154178] f880: ffff8017fbe7cbd0 ffff000008df9e08 29626473203a746e 0000000000000647
[ 2162.161993] f8a0: 0000000000000000 ffff000008eeba58 0000000000000020 0000000000000000
[ 2162.169808] f8c0: 0000000000000000 0000000000000000 ffff0000081f3d78 0000ffff8c4cb0c0
[ 2162.177624] [<ffff000008391190>] kobject_add_internal+0xdc/0x298
[ 2162.183617] [<ffff0000083915bc>] kobject_add+0x90/0xdc
[ 2162.188742] [<ffff00000854bc00>] device_add+0xdc/0x54c
[ 2162.193867] [<ffff00000837baec>] add_partition+0x25c/0x3bc
[ 2162.199338] [<ffff00000837be4c>] rescan_partitions+0x200/0x39c
[ 2162.205157] [<ffff00000822b940>] __blkdev_get+0x2b0/0x39c
[ 2162.210542] [<ffff00000822bba0>] blkdev_get+0x174/0x2f0
[ 2162.215753] [<ffff00000837a5b8>] device_add_disk+0x3c8/0x434
[ 2162.221399] [<ffff0000085a2de4>] sd_probe_async+0xdc/0x1bc
[ 2162.226871] [<ffff0000080df85c>] async_run_entry_fn+0x40/0x108
[ 2162.232691] [<ffff0000080d6324>] process_one_work+0x138/0x2d8
[ 2162.238423] [<ffff0000080d651c>] worker_thread+0x58/0x424
[ 2162.243808] [<ffff0000080dc32c>] kthread+0xf4/0x120
[ 2162.248672] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
[ 2162.253979] sdb: p2 could not be added: 2
[ 2162.258103] kobject_add_internal failed for queue (error: -2 parent: sdb)
[ 2162.264885] ------------[ cut here ]------------
[ 2162.269490] WARNING: CPU: 0 PID: 2150 at lib/kobject.c:244 kobject_add_internal+0xdc/0x298
[ 2162.277739] Modules linked in: hisi_sas_v2_hw(-) hisi_sas_main [last unloaded: hisi_sas_v2_hw]
[ 2162.286339]
[ 2162.287817] CPU: 0 PID: 2150 Comm: kworker/u129:6 Tainted: G W 4.11.0-rc1-13718-gb5b0d57-dirty #1584
[ 2162.298062] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.12 Release 02/27/2017
[ 2162.307267] Workqueue: events_unbound async_run_entry_fn
[ 2162.312566] task: ffff8017b2240000 task.stack: ffff8017b223c000
[ 2162.318471] PC is at kobject_add_internal+0xdc/0x298
[ 2162.323422] LR is at kobject_add_internal+0xdc/0x298
[ 2162.328373] pc : [<ffff000008391190>] lr : [<ffff000008391190>] pstate: 60000145
[ 2162.335753] sp : ffff8017b223fba0
[ 2162.339054] x29: ffff8017b223fba0 x28: ffff000008df7000
[ 2162.344353] x27: ffff0000080d64c4 x26: ffff8017b2238000
[ 2162.349652] x25: ffff8017b27be018 x24: 0000000000000001
[ 2162.354951] x23: ffff8017b27be088 x22: ffff8017b27be088
[ 2162.360251] x21: 00000000fffffffe x20: ffff8017b27be088
[ 2162.365550] x19: ffff8017b27ee9d0 x18: 0000000000000000
[ 2162.370849] x17: 0000ffff8c4cb0c0 x16: ffff0000081f3d78
[ 2162.376148] x15: 0000000000000000 x14: 00001c4900001c45
[ 2162.381447] x13: 00001c4100001c3d x12: 0000000085aac367
[ 2162.386746] x11: ffff000008eeba58 x10: 0000000000000000
[ 2162.392045] x9 : 0000000000000680 x8 : 3a746e6572617020
[ 2162.397344] x7 : ffff000008df9e08 x6 : ffff8017fbe7cbd0
[ 2162.402644] x5 : 0000000000000000 x4 : 0000000000000000
[ 2162.407943] x3 : ffffffffffffffff x2 : ffff000008e11e60
[ 2162.413242] x1 : 0000000000000000 x0 : 000000000000003d
[ 2162.418541]
[ 2162.420019] ---[ end trace 5f225d19a45cb6b4 ]---
[ 2162.424622] Call trace:
[ 2162.427056] Exception stack(0xffff8017b223f9d0 to 0xffff8017b223fb00)
[ 2162.433482] f9c0: ffff8017b27ee9d0 0001000000000000
[ 2162.441297] f9e0: ffff8017b223fba0 ffff000008391190 ffff000008bd1c80 0000000000000000
[ 2162.449113] fa00: ffff8017b27be088 0000000000000001 ffff8017b27be018 ffff8017b2238000
[ 2162.456928] fa20: ffff0000080d64c4 ffff000008df7000 0000000000000140 0000000000000000
[ 2162.464743] fa40: ffff8017b223fba0 ffff8017b223fba0 ffff8017b223fb60 00000000ffffffc8
[ 2162.472559] fa60: ffff8017b223fa90 ffff00000810d7ec 000000000000003d 0000000000000000
[ 2162.480374] fa80: ffff000008e11e60 ffffffffffffffff 0000000000000000 0000000000000000
[ 2162.488190] faa0: ffff8017fbe7cbd0 ffff000008df9e08 3a746e6572617020 0000000000000680
[ 2162.496005] fac0: 0000000000000000 ffff000008eeba58 0000000085aac367 00001c4100001c3d
[ 2162.503820] fae0: 00001c4900001c45 0000000000000000 ffff0000081f3d78 0000ffff8c4cb0c0
[ 2162.511636] [<ffff000008391190>] kobject_add_internal+0xdc/0x298
[ 2162.517629] [<ffff0000083915bc>] kobject_add+0x90/0xdc
[ 2162.522755] [<ffff00000836a538>] blk_register_queue+0x74/0x12c
[ 2162.528573] [<ffff00000837a3fc>] device_add_disk+0x20c/0x434
[ 2162.534219] [<ffff0000085a2de4>] sd_probe_async+0xdc/0x1bc
[ 2162.539691] [<ffff0000080df85c>] async_run_entry_fn+0x40/0x108
[ 2162.545511] [<ffff0000080d6324>] process_one_work+0x138/0x2d8
[ 2162.551243] [<ffff0000080d651c>] worker_thread+0x58/0x424
[ 2162.556628] [<ffff0000080dc32c>] kthread+0xf4/0x120
[ 2162.561492] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
[ 2162.566803] ------------[ cut here ]------------
[ 2162.571408] WARNING: CPU: 0 PID: 2150 at block/genhd.c:653 device_add_disk+0x3dc/0x434
[ 2162.579309] Modules linked in: hisi_sas_v2_hw(-) hisi_sas_main [last unloaded: hisi_sas_v2_hw]
[ 2162.587908]
[ 2162.589387] CPU: 0 PID: 2150 Comm: kworker/u129:6 Tainted: G W 4.11.0-rc1-13718-gb5b0d57-dirty #1584
[ 2162.599632] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.12 Release 02/27/2017
[ 2162.608837] Workqueue: events_unbound async_run_entry_fn
[ 2162.614135] task: ffff8017b2240000 task.stack: ffff8017b223c000
[ 2162.620041] PC is at device_add_disk+0x3dc/0x434
[ 2162.624644] LR is at device_add_disk+0x234/0x434
[ 2162.629247] pc : [<ffff00000837a5cc>] lr : [<ffff00000837a424>] pstate: 20000145
[ 2162.636628] sp : ffff8017b223fcd0
[ 2162.639929] x29: ffff8017b223fcd0 x28: ffff000008df7000
[ 2162.645228] x27: ffff0000080d64c4 x26: ffff8017b2238000
[ 2162.650527] x25: ffff8017b27be018 x24: 0000000000000001
[ 2162.655826] x23: ffff8017c396e800 x22: ffff8017c3f38000
[ 2162.661125] x21: ffff8017b27be088 x20: ffff8017b27be078
[ 2162.666425] x19: ffff8017b27be000 x18: 0000000000000000
[ 2162.671724] x17: 0000ffff8c4cb0c0 x16: ffff0000081f3d78
[ 2162.677023] x15: 0000000000000000 x14: 00001c4900001c45
[ 2162.682322] x13: 00001c4100001c3d x12: 0000000085aac367
[ 2162.687621] x11: ffff000008eeba58 x10: 0000000000000000
[ 2162.692920] x9 : 0000000000000680 x8 : ffff8017b1f77258
[ 2162.698219] x7 : 0000000000000220 x6 : ffff8017fbe86d80
[ 2162.703518] x5 : ffffffffffffffff x4 : 000000000006cb40
[ 2162.708818] x3 : ffff000008dbfd80 x2 : 0000000000000000
[ 2162.714117] x1 : 0000000000000000 x0 : 00000000fffffffe
[ 2162.719416]
[ 2162.720894] ---[ end trace 5f225d19a45cb6b5 ]---
[ 2162.725497] Call trace:
[ 2162.727930] Exception stack(0xffff8017b223fb00 to 0xffff8017b223fc30)
[ 2162.734357] fb00: ffff8017b27be000 0001000000000000 ffff8017b223fcd0 ffff00000837a5cc
[ 2162.742172] fb20: ffff8017b223fb90 ffff0000083901d8 ffff000008f27a78 ffff8017db510e10
[ 2162.749987] fb40: 0000000000000140 ffff8017c4015bb8 ffff8017db510e10 ffff000008f22000
[ 2162.757802] fb60: ffff8017b223fbd0 0000000000000014 0000000000000040 ffff0000082656cc
[ 2162.765618] fb80: ffff8017b223fbd0 ffff0000082656e4 ffff8017b1f771e0 00000000fffffffe
[ 2162.773433] fba0: 00000000fffffffe 0000000000000000 0000000000000000 ffff000008dbfd80
[ 2162.781248] fbc0: 000000000006cb40 ffffffffffffffff ffff8017fbe86d80 0000000000000220
[ 2162.789063] fbe0: ffff8017b1f77258 0000000000000680 0000000000000000 ffff000008eeba58
[ 2162.796879] fc00: 0000000085aac367 00001c4100001c3d 00001c4900001c45 0000000000000000
[ 2162.804694] fc20: ffff0000081f3d78 0000ffff8c4cb0c0
[ 2162.809557] [<ffff00000837a5cc>] device_add_disk+0x3dc/0x434
[ 2162.815203] [<ffff0000085a2de4>] sd_probe_async+0xdc/0x1bc
[ 2162.820675] [<ffff0000080df85c>] async_run_entry_fn+0x40/0x108
[ 2162.826495] [<ffff0000080d6324>] process_one_work+0x138/0x2d8
[ 2162.832227] [<ffff0000080d651c>] worker_thread+0x58/0x424
[ 2162.837612] [<ffff0000080dc32c>] kthread+0xf4/0x120
[ 2162.842476] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
[ 2162.847782] sdb: failed to create sysfs files for events
[ 2162.853109] kobject_add_internal failed for integrity (error: -2 parent: sdb)
[ 2162.860238] ------------[ cut here ]------------
[ 2162.864843] WARNING: CPU: 0 PID: 2150 at lib/kobject.c:244 kobject_add_internal+0xdc/0x298
[ 2162.873092] Modules linked in: hisi_sas_v2_hw(-) hisi_sas_main [last unloaded: hisi_sas_v2_hw]
[ 2162.881692]
[ 2162.883170] CPU: 0 PID: 2150 Comm: kworker/u129:6 Tainted: G W 4.11.0-rc1-13718-gb5b0d57-dirty #1584
[ 2162.893415] Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 UEFI 16.12 Release 02/27/2017
[ 2162.902620] Workqueue: events_unbound async_run_entry_fn
[ 2162.907919] task: ffff8017b2240000 task.stack: ffff8017b223c000
[ 2162.913825] PC is at kobject_add_internal+0xdc/0x298
[ 2162.918776] LR is at kobject_add_internal+0xdc/0x298
[ 2162.923726] pc : [<ffff000008391190>] lr : [<ffff000008391190>] pstate: 60000145
[ 2162.931107] sp : ffff8017b223fbc0
[ 2162.934408] x29: ffff8017b223fbc0 x28: ffff000008df7000
[ 2162.939707] x27: ffff0000080d64c4 x26: ffff8017b2238000
[ 2162.945006] x25: ffff8017b27be018 x24: 0000000000000001
[ 2162.950305] x23: ffff8017c396e800 x22: ffff8017b27be088
[ 2162.955604] x21: 00000000fffffffe x20: 0000000000000000
[ 2162.960903] x19: ffff8017b27be420 x18: 0000000000000000
[ 2162.966202] x17: 0000ffff8c4cb0c0 x16: ffff0000081f3d78
[ 2162.971502] x15: 0000000000000000 x14: 626473203a746e65
[ 2162.976801] x13: 72617020322d203a x12: 726f727265282079
[ 2162.982100] x11: 7469726765746e69 x10: 20726f662064656c
[ 2162.987399] x9 : 696166206c616e72 x8 : 65746e695f646461
[ 2162.992698] x7 : ffff000008df9e08 x6 : ffff8017fbe7cbd0
[ 2162.997997] x5 : 0000000000000000 x4 : 0000000000000000
[ 2163.003296] x3 : ffffffffffffffff x2 : ffff000008e11e60
[ 2163.008595] x1 : 0000000000000000 x0 : 0000000000000041
[ 2163.013895]
[ 2163.015373] ---[ end trace 5f225d19a45cb6b6 ]---
[ 2163.019976] Call trace:
[ 2163.022409] Exception stack(0xffff8017b223f9f0 to 0xffff8017b223fb20)
[ 2163.028835] f9e0: ffff8017b27be420 0001000000000000
[ 2163.036651] fa00: ffff8017b223fbc0 ffff000008391190 ffff000008bd1c80 0000000000000000
[ 2163.044466] fa20: ffff8017c396e800 0000000000000001 ffff8017b27be018 ffff8017b2238000
[ 2163.052281] fa40: ffff0000080d64c4 ffff000008df7000 0000000000000140 0000000000000000
[ 2163.060096] fa60: ffff8017b223fbc0 ffff8017b223fbc0 ffff8017b223fb80 00000000ffffffc8
[ 2163.067912] fa80: ffff8017b223fab0 ffff00000810d7ec 0000000000000041 0000000000000000
[ 2163.075727] faa0: ffff000008e11e60 ffffffffffffffff 0000000000000000 0000000000000000
[ 2163.083542] fac0: ffff8017fbe7cbd0 ffff000008df9e08 65746e695f646461 696166206c616e72
[ 2163.091357] fae0: 20726f662064656c 7469726765746e69 726f727265282079 72617020322d203a
[ 2163.099173] fb00: 626473203a746e65 0000000000000000 ffff0000081f3d78 0000ffff8c4cb0c0
[ 2163.106988] [<ffff000008391190>] kobject_add_internal+0xdc/0x298
[ 2163.112981] [<ffff0000083913dc>] kobject_init_and_add+0x90/0xb4
[ 2163.118887] [<ffff00000838ba90>] blk_integrity_add+0x3c/0x58
[ 2163.124532] [<ffff00000837a490>] device_add_disk+0x2a0/0x434
[ 2163.130178] [<ffff0000085a2de4>] sd_probe_async+0xdc/0x1bc
[ 2163.135650] [<ffff0000080df85c>] async_run_entry_fn+0x40/0x108
[ 2163.141470] [<ffff0000080d6324>] process_one_work+0x138/0x2d8
[ 2163.147202] [<ffff0000080d651c>] worker_thread+0x58/0x424
[ 2163.152587] [<ffff0000080dc32c>] kthread+0xf4/0x120
[ 2163.157451] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
[ 2163.162859] sd 7:0:1:0: [sdb] Attached SCSI disk
[ 2163.189791] hisi_sas_v2_hw HISI0162:01: found dev[6:1] is gone
[ 2163.233739] hisi_sas_v2_hw HISI0162:01: found dev[5:1] is gone
[ 2163.281771] hisi_sas_v2_hw HISI0162:01: found dev[4:1] is gone
[ 2163.321734] hisi_sas_v2_hw HISI0162:01: found dev[3:1] is gone
[ 2163.328034] sd 7:0:1:0: [sdb] Synchronizing SCSI cache
[ 2163.333404] sd 7:0:1:0: [sdb] Stopping disk
[ 2164.013743] hisi_sas_v2_hw HISI0162:01: found dev[2:5] is gone
[ 2164.037791] hisi_sas_v2_hw HISI0162:01: found dev[1:1] is gone
[ 2164.044559] hisi_sas_v2_hw HISI0162:01: found dev[0:2] is gone
root@(none)$


Ring any bells? I don't see this new WARN without the change.


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