[syzbot] INFO: trying to register non-static key in __kernfs_remove

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ca2ef2d9f2aa Merge tag 'kcsan.2021.11.11a' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13147542b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d7259f0deb293aa
dashboard link: https://syzkaller.appspot.com/bug?extid=2d096db761e653901064
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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:
Reported-by: syzbot+2d096d...@syzkaller.appspotmail.com

device veth0_macvtap left promiscuous mode
device veth1_vlan left promiscuous mode
device veth0_vlan left promiscuous mode
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 PID: 1054 Comm: kworker/u4:5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
assign_lock_key kernel/locking/lockdep.c:951 [inline]
register_lock_class+0xf79/0x10c0 kernel/locking/lockdep.c:1263
__lock_acquire+0x105/0x54a0 kernel/locking/lockdep.c:4906
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
kernfs_drain fs/kernfs/dir.c:470 [inline]
__kernfs_remove+0x885/0xab0 fs/kernfs/dir.c:1351
kernfs_remove_by_name_ns+0x4f/0xa0 fs/kernfs/dir.c:1544
kernfs_remove_by_name include/linux/kernfs.h:570 [inline]
sysfs_unmerge_group+0xe3/0x160 fs/sysfs/group.c:368
rpm_sysfs_remove drivers/base/power/sysfs.c:826 [inline]
dpm_sysfs_remove+0x79/0xb0 drivers/base/power/sysfs.c:835
device_del+0x20c/0xd60 drivers/base/core.c:3558
unregister_netdevice_many+0xd1f/0x1790 net/core/dev.c:11104
default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11607
ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
general protection fault, probably for non-canonical address 0xdffffc000000020c: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000000001060-0x0000000000001067]
CPU: 1 PID: 1054 Comm: kworker/u4:5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:idr_remove+0x22/0x50 lib/idr.c:154
Code: 84 00 00 00 00 00 66 90 55 48 89 fd 53 48 89 f3 e8 e3 ba 82 fd 48 8d 7d 50 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 15 8b 45 50 48 89 ef 31 d2 48 29
RSP: 0018:ffffc900055af6c8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000063555 RCX: 0000000000000000
RDX: 000000000000020c RSI: ffffffff83f50b8d RDI: 0000000000001060
RBP: 0000000000001010 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000ab5ece R11: 0000000000000004 R12: ffff88800010fe80
R13: 0000000000000000 R14: ffff88800010feb8 R15: 0000000080000001
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe27b454008 CR3: 000000000b68e000 CR4: 00000000003506e0
Call Trace:
<TASK>
kernfs_put.part.0+0x294/0x540 fs/kernfs/dir.c:537
kernfs_put+0x42/0x50 fs/kernfs/dir.c:513
__kernfs_remove+0x725/0xab0 fs/kernfs/dir.c:1372
kernfs_remove_by_name_ns+0x4f/0xa0 fs/kernfs/dir.c:1544
kernfs_remove_by_name include/linux/kernfs.h:570 [inline]
remove_files+0x96/0x1c0 fs/sysfs/group.c:28
sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:288
sysfs_remove_groups fs/sysfs/group.c:312 [inline]
sysfs_remove_groups+0x5c/0xa0 fs/sysfs/group.c:304
device_remove_groups drivers/base/core.c:2480 [inline]
device_remove_attrs+0xcb/0x170 drivers/base/core.c:2680
device_del+0x4fa/0xd60 drivers/base/core.c:3580
unregister_netdevice_many+0xd1f/0x1790 net/core/dev.c:11104
default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11607
ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
---[ end trace be4fbae9b304820b ]---
RIP: 0010:idr_remove+0x22/0x50 lib/idr.c:154
Code: 84 00 00 00 00 00 66 90 55 48 89 fd 53 48 89 f3 e8 e3 ba 82 fd 48 8d 7d 50 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 15 8b 45 50 48 89 ef 31 d2 48 29
RSP: 0018:ffffc900055af6c8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000063555 RCX: 0000000000000000
RDX: 000000000000020c RSI: ffffffff83f50b8d RDI: 0000000000001060
RBP: 0000000000001010 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000ab5ece R11: 0000000000000004 R12: ffff88800010fe80
R13: 0000000000000000 R14: ffff88800010feb8 R15: 0000000080000001
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe27b454008 CR3: 000000000b68e000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: 84 00 test %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 00 add %al,(%rax)
6: 66 90 xchg %ax,%ax
8: 55 push %rbp
9: 48 89 fd mov %rdi,%rbp
c: 53 push %rbx
d: 48 89 f3 mov %rsi,%rbx
10: e8 e3 ba 82 fd callq 0xfd82baf8
15: 48 8d 7d 50 lea 0x50(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 04 je 0x36
32: 3c 03 cmp $0x3,%al
34: 7e 15 jle 0x4b
36: 8b 45 50 mov 0x50(%rbp),%eax
39: 48 89 ef mov %rbp,%rdi
3c: 31 d2 xor %edx,%edx
3e: 48 rex.W
3f: 29 .byte 0x29


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.