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SubjectWARNING in ib_uverbs_remove_one

syzbot found the following crash on:

HEAD commit: 5076190d mm: slub: be more careful about the double cmpxch..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

------------[ cut here ]------------
sysfs group 'power' not found for kobject 'uverbs0'
WARNING: CPU: 0 PID: 73 at fs/sysfs/group.c:278 sysfs_remove_group fs/sysfs/group.c:278 [inline]
WARNING: CPU: 0 PID: 73 at fs/sysfs/group.c:278 sysfs_remove_group+0x155/0x1b0 fs/sysfs/group.c:269
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 73 Comm: kworker/u4:3 Not tainted 5.6.0-rc6-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+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x35 kernel/panic.c:582
report_bug+0x27b/0x2f0 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:174 [inline]
fixup_bug arch/x86/kernel/traps.c:169 [inline]
do_error_trap+0x12b/0x220 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 fs/sysfs/group.c:278 [inline]
RIP: 0010:sysfs_remove_group+0x155/0x1b0 fs/sysfs/group.c:269
Code: 48 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 41 48 8b 33 48 c7 c7 60 a8 19 88 e8 c3 0d 61 ff <0f> 0b eb 95 e8 92 ba cb ff e9 d2 fe ff ff 48 89 df e8 85 ba cb ff
RSP: 0018:ffffc90001057ad0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff887145e0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815c06c1 RDI: fffff5200020af4c
RBP: 0000000000000000 R08: ffff8880a9330580 R09: ffffed1015cc6659
R10: ffffed1015cc6658 R11: ffff8880ae6332c7 R12: ffff8880905fc058
R13: ffffffff88714b80 R14: ffff88804d598558 R15: ffffffff8a1df3e0
dpm_sysfs_remove+0x97/0xb0 drivers/base/power/sysfs.c:741
device_del+0x18b/0xd30 drivers/base/core.c:2654
cdev_device_del+0x15/0x80 fs/char_dev.c:570
ib_uverbs_remove_one drivers/infiniband/core/uverbs_main.c:1207 [inline]
ib_uverbs_remove_one+0x3f/0x540 drivers/infiniband/core/uverbs_main.c:1199
remove_client_context+0xbe/0x110 drivers/infiniband/core/device.c:724
disable_device+0x13b/0x230 drivers/infiniband/core/device.c:1268
__ib_unregister_device+0x91/0x180 drivers/infiniband/core/device.c:1435
ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1545
process_one_work+0x94b/0x1690 kernel/workqueue.c:2266
worker_thread+0x96/0xe20 kernel/workqueue.c:2412
kthread+0x357/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

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