Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 1 UID: 0 PID: 16399 Comm: syz.3.2623 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:593 [inline]
RIP: 0010:__mutex_lock+0x13b/0x1350 kernel/locking/mutex.c:776
Code: 20 54 8b 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 25 10 00 00 83 3d 23 53 30 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 d9 14 cc f6 4d 39 64 24 60 0f 85 51 0f 00
RSP: 0018:ffffc9000c2e7420 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffffc9000c2e7500 RCX: ffffffff998b5403
RDX: 0000000000000000 RSI: ffffffff8d975e98 RDI: 00000000000000c8
RBP: ffffc9000c2e75d8 R08: ffffc9000c2e7547 R09: 0000000000000000
R10: ffffc9000c2e7520 R11: fffff5200185cea9 R12: 0000000000000068
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fb9a9f956c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c23ffc CR3: 00000000595ec000 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+0xa6/0x1c0 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+0x461/0x4f00 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813
 __i2c_transfer+0x79a/0x1f00 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x1cc/0x2d0 drivers/i2c/i2c-core-base.c:2317
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 i2cdev_ioctl+0x64b/0x820 drivers/i2c/i2c-dev.c:467
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb9a918f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb9a9f95038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb9a93e5fa0 RCX: 00007fb9a918f749
RDX: 0000200000000a40 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007fb9a9213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9a93e6038 R14: 00007fb9a93e5fa0 R15: 00007fb9a950fa28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:593 [inline]
RIP: 0010:__mutex_lock+0x13b/0x1350 kernel/locking/mutex.c:776
Code: 20 54 8b 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 25 10 00 00 83 3d 23 53 30 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 d9 14 cc f6 4d 39 64 24 60 0f 85 51 0f 00
RSP: 0018:ffffc9000c2e7420 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffffc9000c2e7500 RCX: ffffffff998b5403
RDX: 0000000000000000 RSI: ffffffff8d975e98 RDI: 00000000000000c8
RBP: ffffc9000c2e75d8 R08: ffffc9000c2e7547 R09: 0000000000000000
R10: ffffc9000c2e7520 R11: fffff5200185cea9 R12: 0000000000000068
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fb9a9f956c0(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cdffaa1000 CR3: 00000000595ec000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	20 54 8b 99          	and    %dl,-0x67(%rbx,%rcx,4)
   4:	48 c1 e8 03          	shr    $0x3,%rax
   8:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
   d:	84 c0                	test   %al,%al
   f:	0f 85 25 10 00 00    	jne    0x103a
  15:	83 3d 23 53 30 0e 00 	cmpl   $0x0,0xe305323(%rip)        # 0xe30533f
  1c:	75 23                	jne    0x41
  1e:	49 8d 7c 24 60       	lea    0x60(%r12),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 d9 14 cc f6       	call   0xf6cc150f
  36:	4d 39 64 24 60       	cmp    %r12,0x60(%r12)
  3b:	0f                   	.byte 0xf
  3c:	85 51 0f             	test   %edx,0xf(%rcx)