Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
CPU: 1 UID: 0 PID: 5802 Comm: syz.1.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x143/0x15a0 kernel/locking/mutex.c:821
Code: c0 00 2a c9 9b 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 8d 12 00 00 83 3d 2b 6e c5 0f 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 02 2c 3c f6 4d 39 64 24 58 0f 85 a0 11 00 00
RSP: 0018:ffffc90005067280 EFLAGS: 00010206
RAX: 0000000000000018 RBX: dffffc0000000000 RCX: ffffffff9bc92a03
RDX: 0000000000000000 RSI: ffffffff8e92c24a RDI: 00000000000000c0
RBP: ffffc90005067418 R08: ffffc90005067387 R09: 0000000000000000
R10: ffffc90005067360 R11: fffff52000a0ce71 R12: 0000000000000068
R13: 0000000000000000 R14: 1ffff92000a0ce64 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123722000(0063) knlGS:00000000f53b6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c42524a CR3: 000000002e70c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dvb_usbv2_generic_write+0x26/0x60 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77
 mxl111sf_ctrl_msg+0x160/0x2f0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73
 mxl111sf_write_reg+0xa9/0x1b0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:123
 mxl111sf_i2c_start drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:130 [inline]
 mxl111sf_i2c_sw_xfer_msg drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:-1 [inline]
 mxl111sf_i2c_xfer+0x463/0x5060 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813
 __i2c_transfer+0x7bf/0x1fe0 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x1cb/0x2d0 drivers/i2c/i2c-core-base.c:2396
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 compat_i2cdev_ioctl+0x59f/0x5c0 drivers/i2c/i2c-dev.c:578
 __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
 __ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x28b/0x6c0 arch/x86/entry/syscall_32.c:282
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:307
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf739ef1c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f53b650c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000707
RDX: 0000000080000680 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x143/0x15a0 kernel/locking/mutex.c:821
Code: c0 00 2a c9 9b 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 8d 12 00 00 83 3d 2b 6e c5 0f 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 02 2c 3c f6 4d 39 64 24 58 0f 85 a0 11 00 00
RSP: 0018:ffffc90005067280 EFLAGS: 00010206
RAX: 0000000000000018 RBX: dffffc0000000000 RCX: ffffffff9bc92a03
RDX: 0000000000000000 RSI: ffffffff8e92c24a RDI: 00000000000000c0
RBP: ffffc90005067418 R08: ffffc90005067387 R09: 0000000000000000
R10: ffffc90005067360 R11: fffff52000a0ce71 R12: 0000000000000068
R13: 0000000000000000 R14: 1ffff92000a0ce64 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123722000(0063) knlGS:00000000f53b6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002d30aff8 CR3: 000000002e70c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	c0 00 2a             	rolb   $0x2a,(%rax)
   3:	c9                   	leave
   4:	9b                   	fwait
   5:	48 c1 e8 03          	shr    $0x3,%rax
   9:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax
   d:	84 c0                	test   %al,%al
   f:	0f 85 8d 12 00 00    	jne    0x12a2
  15:	83 3d 2b 6e c5 0f 00 	cmpl   $0x0,0xfc56e2b(%rip)        # 0xfc56e47
  1c:	75 22                	jne    0x40
  1e:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 05                	je     0x35
  30:	e8 02 2c 3c f6       	call   0xf63c2c37
  35:	4d 39 64 24 58       	cmp    %r12,0x58(%r12)
  3a:	0f 85 a0 11 00 00    	jne    0x11e0