Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 0 UID: 0 PID: 9140 Comm: syz.1.861 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:577 [inline]
RIP: 0010:__mutex_lock+0x13b/0x1350 kernel/locking/mutex.c:760
Code: 60 93 79 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 2b 10 00 00 83 3d 43 a6 31 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 49 d8 dd f6 4d 39 64 24 60 0f 85 51 0f 00
RSP: 0018:ffffc9000b0ef160 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffffc9000b0ef240 RCX: ffffffff99799303
RDX: ffff88802e56bc80 RSI: ffffffff8d8f50e4 RDI: 00000000000000c8
RBP: ffffc9000b0ef318 R08: ffffc9000b0ef287 R09: 0000000000000000
R10: ffffc9000b0ef260 R11: fffff5200161de51 R12: 0000000000000068
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812613b000(0063) knlGS:00000000f544db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055b44236e008 CR3: 000000007e3fe000 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+0x16a/0x2e0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73
 mxl111sf_write_reg+0xa0/0x180 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+0x874/0x2170 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x25b/0x3a0 drivers/i2c/i2c-core-base.c:2317
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 compat_i2cdev_ioctl+0x5a8/0x5c0 drivers/i2c/i2c-dev.c:575
 __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
 __ia32_compat_sys_ioctl+0x543/0x840 fs/ioctl.c:638
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf705d539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 90 90
RSP: 002b:00000000f544d55c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000707
RDX: 0000000080000a40 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:577 [inline]
RIP: 0010:__mutex_lock+0x13b/0x1350 kernel/locking/mutex.c:760
Code: 60 93 79 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 2b 10 00 00 83 3d 43 a6 31 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 49 d8 dd f6 4d 39 64 24 60 0f 85 51 0f 00
RSP: 0018:ffffc9000b0ef160 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffffc9000b0ef240 RCX: ffffffff99799303
RDX: ffff88802e56bc80 RSI: ffffffff8d8f50e4 RDI: 00000000000000c8
RBP: ffffc9000b0ef318 R08: ffffc9000b0ef287 R09: 0000000000000000
R10: ffffc9000b0ef260 R11: fffff5200161de51 R12: 0000000000000068
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812623b000(0063) knlGS:00000000f544db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003120cffc CR3: 000000007e3fe000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	93                   	xchg   %eax,%ebx
   1:	79 99                	jns    0xffffff9c
   3:	48 c1 e8 03          	shr    $0x3,%rax
   7:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
   c:	84 c0                	test   %al,%al
   e:	0f 85 2b 10 00 00    	jne    0x103f
  14:	83 3d 43 a6 31 0e 00 	cmpl   $0x0,0xe31a643(%rip)        # 0xe31a65e
  1b:	75 23                	jne    0x40
  1d:	49 8d 7c 24 60       	lea    0x60(%r12),%rdi
  22:	48 89 f8             	mov    %rdi,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2e:	74 05                	je     0x35
  30:	e8 49 d8 dd f6       	call   0xf6ddd87e
  35:	4d 39 64 24 60       	cmp    %r12,0x60(%r12)
  3a:	0f                   	.byte 0xf
  3b:	85 51 0f             	test   %edx,0xf(%rcx)