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Date:   Mon, 05 Oct 2020 01:48:25 -0700
From:   syzbot <>
Subject: WARNING in __ib_unregister_device


syzbot found the following issue on:

HEAD commit:    f5083d0c drivers/net/wan/hdlc_fr: Improvements to the code..
git tree:       net-next
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 10.1.0-syz 20200507

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

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

smc: removing ib device syz1
------------[ cut here ]------------
sysfs group 'power' not found for kobject 'syz1'
WARNING: CPU: 1 PID: 30473 at fs/sysfs/group.c:279 sysfs_remove_group+0x126/0x170 fs/sysfs/group.c:279
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 30473 Comm: kworker/u4:0 Not tainted 5.9.0-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+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:sysfs_remove_group+0x126/0x170 fs/sysfs/group.c:279
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 37 48 8b 33 48 c7 c7 c0 31 9b 88 e8 8c ae 58 ff <0f> 0b eb 98 e8 a1 69 ca ff e9 01 ff ff ff 48 89 df e8 94 69 ca ff
RSP: 0018:ffffc9001599fbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff88fa00e0 RCX: 0000000000000000
RDX: ffff888065092380 RSI: ffffffff815f7935 RDI: fffff52002b33f6d
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880ae531927
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880666c46d8
R13: ffffffff88fa0680 R14: ffff8880a6adb100 R15: ffff8880aa071800
 dpm_sysfs_remove+0x97/0xb0 drivers/base/power/sysfs.c:801
 device_del+0x18b/0xd90 drivers/base/core.c:3080
 __ib_unregister_device+0xb5/0x1a0 drivers/infiniband/core/device.c:1464
 ib_unregister_work+0x15/0x30 drivers/infiniband/core/device.c:1569
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..

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