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[ChristianEhrhardt <1559784@xxxxxxxxxxxxxxxxxx>]

modinfo zfcp; for i in {1..1000}; do echo "Try $i"; modprobe zfcp; lsmod | grep -q zfcp && echo ok-here; rmmod zfcp; lsmod | grep zfcp || echo ok-gone; done 
filename:       /lib/modules/4.4.0-15-generic/kernel/drivers/s390/scsi/zfcp.ko
license:        GPL
description:    FCP HBA driver
author:         IBM Deutschland Entwicklung GmbH - linux390@xxxxxxxxxx
srcversion:     342AF26FBC6A761648C34AB
alias:          ccw:t1731m03dt1732dm04*
alias:          ccw:t1731m03dt1732dm03*
depends:        qdio,scsi_transport_fc
intree:         Y
vermagic:       4.4.0-15-generic SMP mod_unload modversions 
parm:           queue_depth:Default queue depth for new SCSI devices (uint)
parm:           dif:Enable DIF/DIX data integrity support (bool)
parm:           allow_lun_scan:For NPIV, scan and attach all storage LUNs (bool)
parm:           datarouter:Enable hardware data router support (default on) (bool)
parm:           no_auto_port_rescan:no automatic port_rescan (default off) (bool)
parm:           port_scan_backoff:upper limit of port scan random backoff in msecs (default 500) (uint)
parm:           port_scan_ratelimit:minimum interval between port scans in msecs (default 60000) (uint)
parm:           dbfsize:number of pages for each debug feature area (default 4) (uint)
parm:           dbflevel:log level for each debug feature area (default 3, range 0..6) (uint)
parm:           device:specify initial device (charp)
Try 1
ok-here
ok-gone
Try 2
ok-here
ok-gone
[...]

you get the idea, worked until 1000.

Therefore the bug is invalid with a recent kernel

** Changed in: linux (Ubuntu Xenial)
       Status: In Progress => Invalid

** Changed in: linux (Ubuntu Xenial)
       Status: Invalid => Fix Released

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https://bugs.launchpad.net/bugs/1559784

Title:
  zFCP on s390x problems on zfcp module unloading

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  Right after unloading zFCP module I got:

  [ 1432.522123] sysfs group 0000000000b5aa30 not found for kobject '1:0:0:1073823786'
  [ 1432.522138] ------------[ cut here ]------------
  [ 1432.522139] WARNING: at /build/linux-RgAt0H/linux-4.3.0/fs/sysfs/group.c:224
  [ 1432.522140] Modules linked in: ghash_s390(E) prng(E) aes_s390(E) des_s390(E) des_generic(E) sha512_s390(E) sha256_s390(E) sha1_s390(E) sha_common(E) vmur(E) qeth_l2(E) qeth(E) ccwgroup(E) dasd_eckd_mod(E) dasd_mod(E) zfcp(E-) qdio(E) scsi_transport_fc(E)
  [ 1432.522149] CPU: 2 PID: 5873 Comm: rmmod Tainted: G            E   4.3.0-2-generic #11-Ubuntu
  [ 1432.522151] task: 0000000076f4a9e0 ti: 00000000ed85c000 task.ti: 00000000ed85c000
  [ 1432.522152] Krnl PSW : 0704d00180000000 000000000036cbee (sysfs_remove_group+0xbe/0xd0)
  [ 1432.522158]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 EA:3
                 Krnl GPRS: 0000000000c76c33 0000000000c58e3c 0000000000000045 00000000fb1ac7a0
  [ 1432.522160]            000000000036cbea 0000000000000000 0000000078d70050 0000000078d70000
  [ 1432.522161]            0000000080000000 00000000f93df000 0000000078d7e010 0000000000000000
  [ 1432.522162]            00000000ed85c000 0000000000b5aa30 000000000036cbea 00000000ed85fa78
  [ 1432.522168] Krnl Code: 000000000036cbde: c020002bc358	larl	%r2,8e528e
                            000000000036cbe4: c0e5fff7144a	brasl	%r14,24f478
                           #000000000036cbea: a7f40001		brc	15,36cbec
                           >000000000036cbee: e340f0c00004	lg	%r4,192(%r15)
                            000000000036cbf4: ebaff0a00004	lmg	%r10,%r15,160(%r15)
                            000000000036cbfa: 07f4		bcr	15,%r4
                            000000000036cbfc: 0707		bcr	0,%r7
                            000000000036cbfe: 0707		bcr	0,%r7
  [ 1432.522177] Call Trace:
  [ 1432.522179] ([<000000000036cbea>] sysfs_remove_group+0xba/0xd0)
  [ 1432.522183]  [<0000000000575a44>] device_del+0x5c/0x268
  [ 1432.522184]  [<0000000000575c90>] device_unregister+0x40/0x98
  [ 1432.522186]  [<00000000004d9b0c>] bsg_unregister_queue+0x74/0xd8
  [ 1432.522189]  [<00000000005aff76>] __scsi_remove_device+0xe6/0x118
  [ 1432.522192]  [<00000000005adaca>] scsi_forget_host+0xca/0xf8
  [ 1432.522193]  [<000000000059fa86>] scsi_remove_host+0xbe/0x1c8
  [ 1432.522200]  [<000003ff800496a6>] zfcp_scsi_adapter_unregister+0x9e/0xc8 [zfcp]
  [ 1432.522202]  [<000003ff8003b55e>] zfcp_adapter_unregister+0x7e/0xc0 [zfcp]
  [ 1432.522205]  [<000003ff8003c876>] zfcp_ccw_remove+0x28e/0x2b0 [zfcp]
  [ 1432.522207]  [<0000000000604814>] ccw_device_remove+0x44/0x210
  [ 1432.522209]  [<000000000057a9fe>] __device_release_driver+0xa6/0x150
  [ 1432.522211]  [<000000000057b782>] driver_detach+0x11a/0x120
  [ 1432.522212]  [<000000000057a342>] bus_remove_driver+0x82/0x118
  [ 1432.522214]  [<000003ff8004bdd2>] zfcp_module_exit+0x2a/0x258 [zfcp]
  [ 1432.522217]  [<00000000001caf6c>] SyS_delete_module+0x1c4/0x210
  [ 1432.522221]  [<000000000076dbfe>] system_call+0xd6/0x264
  [ 1432.522222]  [<000003ffb0f6e416>] 0x3ffb0f6e416
  [ 1432.522223] Last Breaking-Event-Address:
  [ 1432.522224]  [<000000000036cbea>] sysfs_remove_group+0xba/0xd0
  [ 1432.522225] ---[ end trace 2e7b1c668b02f90a ]---
  [ 1432.522430] sysfs group 0000000000b5aa30 not found for kobject '1:0:0:1073823786'
  [ 1432.522434] ------------[ cut here ]------------

  Opening the bug for tracking purposes.

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