loop0: detected capacity change from 0 to 64
minix: Unknown parameter '/dev/video2'
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888044211118, owner = 0x0, curr 0xffff88801d06ca80, list not empty
WARNING: kernel/locking/rwsem.c:1413 at __up_write kernel/locking/rwsem.c:1412 [inline], CPU#0: syz.0.0/5331
WARNING: kernel/locking/rwsem.c:1413 at up_write+0x35c/0x4a0 kernel/locking/rwsem.c:1688, CPU#0: syz.0.0/5331
Modules linked in:
CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1412 [inline]
RIP: 0010:up_write+0x40f/0x4a0 kernel/locking/rwsem.c:1688
Code: ed 8b 49 c7 c2 40 03 ed 8b 4c 0f 44 d0 48 8b 7c 24 10 48 c7 c6 e0 05 ed 8b 48 8b 14 24 48 8b 4c 24 08 4d 89 e0 4d 89 f9 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 f3 b4 2f 03 e9 d6 fc ff ff 48 c7 c1
RSP: 0018:ffffc9000fb0fc60 EFLAGS: 00010246
RAX: ffffffff8bed0360 RBX: ffff888044211118 RCX: ffff888044211118
RDX: 0000000000000000 RSI: ffffffff8bed05e0 RDI: ffffffff905b4b10
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff88801d06ca80
R10: ffffffff8bed0360 R11: ffffed1008842225 R12: 0000000000000000
R13: ffff888044211120 R14: ffff888044211170 R15: ffff88801d06ca80
FS:  00007f5dd9ff56c0(0000) GS:ffff88808c53f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5dd9fd3ff8 CR3: 000000001d21f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1034 [inline]
 __unlock_mount fs/namespace.c:2808 [inline]
 unlock_mount fs/namespace.c:2818 [inline]
 do_new_mount_fc fs/namespace.c:3788 [inline]
 do_new_mount+0x82d/0xdc0 fs/namespace.c:3841
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5dddb9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5dd9ff4fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5ddde25fa0 RCX: 00007f5dddb9e019
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f5dddc3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ddde26038 R14: 00007f5ddde25fa0 R15: 00007ffec7135998
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	49 c7 c2 40 03 ed 8b 	mov    $0xffffffff8bed0340,%r10
   7:	4c 0f 44 d0          	cmove  %rax,%r10
   b:	48 8b 7c 24 10       	mov    0x10(%rsp),%rdi
  10:	48 c7 c6 e0 05 ed 8b 	mov    $0xffffffff8bed05e0,%rsi
  17:	48 8b 14 24          	mov    (%rsp),%rdx
  1b:	48 8b 4c 24 08       	mov    0x8(%rsp),%rcx
  20:	4d 89 e0             	mov    %r12,%r8
  23:	4d 89 f9             	mov    %r15,%r9
  26:	41 52                	push   %r10
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	48 83 c4 08          	add    $0x8,%rsp
  31:	e8 f3 b4 2f 03       	call   0x32fb529
  36:	e9 d6 fc ff ff       	jmp    0xfffffd11
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7
  3d:	c1                   	.byte 0xc1