------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12e2/0x1550, CPU#0: syz.4.547/7658
Modules linked in:
CPU: 0 UID: 0 PID: 7658 Comm: syz.4.547 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__mutex_lock+0x12e9/0x1550
Code: 59 7a 91 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d 2b c9 93 05 00 75 13 48 8d 3d de c4 96 05 48 c7 c6 40 10 0d 8c <67> 48 0f b9 3a 90 e9 6b ee ff ff 90 0f 0b 90 e9 3e f2 ff ff 90 0f
RSP: 0018:ffffc900040f7680 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88810a3f0000
RDX: 0000000000000000 RSI: ffffffff8c0d1040 RDI: ffffffff917d5540
RBP: ffffc900040f7820 R08: ffffffff917a5983 R09: 1ffffffff22f4b30
R10: dffffc0000000000 R11: fffffbfff22f4b31 R12: ffff888119dfc010
R13: 0000000000000000 R14: 1ffff9200081eee4 R15: 0000000000000000
FS:  00007fb0b759f6c0(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0b75dffe0 CR3: 000000002a948000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 as102_stream_ctrl+0x27/0xc0
 __dvb_frontend_open+0x2e9/0xc40
 dvb_device_open+0x24f/0x340
 chrdev_open+0x4d9/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x1443/0x1d60
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0b675ea0e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fb0b759eb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb0b759f6c0 RCX: 00007fb0b675ea0e
RDX: 0000000000000802 RSI: 00007fb0b759ec00 RDI: ffffffffffffff9c
RBP: 00007fb0b759ec00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007fb0b6a26218 R14: 00007fb0b6a26180 R15: 00007ffd0ca77838
 </TASK>
