------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: kernel/locking/mutex.c:611 at __mutex_lock_common kernel/locking/mutex.c:611 [inline], CPU#1: syz.5.897/9482
WARNING: kernel/locking/mutex.c:611 at __mutex_lock+0x94f/0x1b10 kernel/locking/mutex.c:806, CPU#1: syz.5.897/9482
Modules linked in:
CPU: 1 UID: 0 PID: 9482 Comm: syz.5.897 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:__mutex_lock_common kernel/locking/mutex.c:611 [inline]
RIP: 0010:__mutex_lock+0x956/0x1b10 kernel/locking/mutex.c:806
Code: 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 a8 10 00 00 44 8b 35 3d c6 3f 05 45 85 f6 75 13 48 8d 3d b1 e5 42 05 48 c7 c6 a0 ba af 8b <67> 48 0f b9 3a 90 e9 10 f8 ff ff 4d 8d a7 e0 0a 00 00 4c 89 e7 e8
RSP: 0018:ffffc900079ffa50 EFLAGS: 00010246

RAX: 0000000000000003 RBX: ffff888038026b30 RCX: 1ffffffff21b8adc
RDX: 0000000000000000 RSI: ffffffff8bafbaa0 RDI: ffffffff90df7660
RBP: ffffc900079ffbc0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007ff1445846c0(0000) GS:ffff8880d63db000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e2867 CR3: 000000002e669000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 as102_dvb_dmx_start_feed+0x7d/0x2e0 drivers/media/usb/as102/as102_drv.c:139
 dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:977
 dvb_dmxdev_filter_start+0x767/0xdd0 drivers/media/dvb-core/dmxdev.c:760
 dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:978 [inline]
 dvb_demux_do_ioctl+0xe64/0x1200 drivers/media/dvb-core/dmxdev.c:1092
 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:996
 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff14379c819
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:00007ff144584028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff143a15fa0 RCX: 00007ff14379c819
RDX: 0000200000000200 RSI: 00000000403c6f2b RDI: 000000000000000a
RBP: 00007ff143832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff143a16038 R14: 00007ff143a15fa0 R15: 00007ffc95fd6de8
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f b6 14 11          	movzbl (%rcx,%rdx,1),%edx
   4:	38 d0                	cmp    %dl,%al
   6:	7c 08                	jl     0x10
   8:	84 d2                	test   %dl,%dl
   a:	0f 85 a8 10 00 00    	jne    0x10b8
  10:	44 8b 35 3d c6 3f 05 	mov    0x53fc63d(%rip),%r14d        # 0x53fc654
  17:	45 85 f6             	test   %r14d,%r14d
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d b1 e5 42 05 	lea    0x542e5b1(%rip),%rdi        # 0x542e5d4
  23:	48 c7 c6 a0 ba af 8b 	mov    $0xffffffff8bafbaa0,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	90                   	nop
  30:	e9 10 f8 ff ff       	jmp    0xfffff845
  35:	4d 8d a7 e0 0a 00 00 	lea    0xae0(%r15),%r12
  3c:	4c 89 e7             	mov    %r12,%rdi
  3f:	e8                   	.byte 0xe8