WARNING in ib_umad_kill

WARNING in ib_umad_kill_port
Status: upstream: reported on 2020/04/06 06:37
Reported-by: syzbot+9627a92b1f9262d5d30c@syzkaller.appspotmail.com
First crash: 62d, last: 19h49m

Sample crash report:

------------[ cut here ]------------
sysfs group 'power' not found for kobject 'umad1'
WARNING: CPU: 1 PID: 32659 at fs/sysfs/group.c:281 sysfs_remove_group+0x16c/0x280 fs/sysfs/group.c:279
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 32659 Comm: kworker/u4:2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound ib_unregister_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1ac/0x2d0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:sysfs_remove_group+0x16c/0x280 fs/sysfs/group.c:279
Code: 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 b8 e8 cd ff 49 8b 17 48 c7 c7 97 69 e9 88 48 89 de 31 c0 e8 74 1f 62 ff <0f> 0b 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 22 0b 90 ff 49 8d 5e 20
RSP: 0018:ffffc90017a77a90 EFLAGS: 00010246
RAX: cd85369134ea1800 RBX: ffffffff8883e430 RCX: ffff88804b08e1c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffffffff1107c87 R08: ffffffff815cbca9 R09: ffffed1015d245ca
R10: ffffed1015d245ca R11: 0000000000000000 R12: ffff88804c450cf0
R13: dffffc0000000000 R14: ffffffff8883e438 R15: ffff888028912070
 device_del+0x265/0x1160 drivers/base/core.c:2687
 cdev_device_del+0x22/0xe0 fs/char_dev.c:570
 ib_umad_kill_port+0x49/0x220 drivers/infiniband/core/user_mad.c:1327
 ib_umad_remove_one+0x182/0x290 drivers/infiniband/core/user_mad.c:1409
 remove_client_context+0xb3/0x1e0 drivers/infiniband/core/device.c:724
 disable_device+0xec/0x2e0 drivers/infiniband/core/device.c:1270
 __ib_unregister_device+0x6c/0x160 drivers/infiniband/core/device.c:1437
 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1547
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (36):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-smack-root	2020/04/18 14:18	upstream	90280eaa	365fba24	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/06/01 15:10	net	bdc48fa1	a0331e89	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/31 17:55	net	d9a81a22	a0331e89	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/27 21:56	net	a4976a3e	ec153193	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/27 07:52	net	1a6da4fc	9072c126	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/20 20:43	net	20a785aa	1255f02a	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/17 10:59	net	b6dd5acd	37bccd4e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/13 11:02	net	eead1c2e	9a6d42fb	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/12 09:56	net	1abfb181	160c7698	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/06 20:10	net	38212bb3	4618eb2d	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/02 22:53	net	dc30b405	58da4c35	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/05/01 04:28	net	30724ccb	3698959a	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/28 22:20	net	8999dc89	e3ecea2e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/27 22:58	net	52a90612	0ce7569e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/27 08:41	net	52a90612	0ce7569e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/26 12:34	net	167ff131	99b258dd	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/16 07:34	net	edadedf1	c743fcb3	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/15 07:07	net	82f35276	3f3c5574	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-this-kasan-gce	2020/04/01 19:39	net	304e0242	a34e2c33	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/06/02 08:30	net-next	9a25c1df	a0331e89	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/31 06:07	net-next	4300c7e7	6f3e1c7c	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/30 00:49	net-next	394f9ebf	3905eaae	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/26 15:35	net-next	d52caf04	8ca3b7d2	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/25 10:12	net-next	31610711	11284182	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/22 09:46	net-next	2a330b53	5afa2ddd	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/21 17:35	net-next	de1b99ef	1f30020f	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/21 12:17	net-next	de1b99ef	1f30020f	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/20 08:30	net-next	2de49925	67fa1f59	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/18 08:15	net-next	dbfe7d74	37bccd4e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/16 22:26	net-next	6f42a293	37bccd4e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/05/15 05:25	net-next	86b6ba17	2d572622	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/04/28 10:20	net-next	3608a199	0ce7569e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/04/25 04:07	net-next	493f3cc7	03d97a1b	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/04/24 18:19	net-next	493f3cc7	03d97a1b	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/04/24 11:57	net-next	b86a0373	2e44d63e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci-upstream-net-kasan-gce	2020/04/23 21:25	net-next	b86a0373	2e44d63e	.config	log	report	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org