i2c i2c-1: ioctl, cmd=0x707, arg=0x200000000300
W: (0x1a, 0x1e)
mxl111sf_ctrl_msg(wlen = 2, rlen = 0)
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
CPU: 1 UID: 0 PID: 18524 Comm: syz.1.2537 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x15d/0x1bd0 kernel/locking/mutex.c:821
Code: 08 84 d2 0f 85 62 14 00 00 44 8b 0d fd a7 c7 0f 45 85 c9 75 29 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 59 14 00 00 48 3b 5b 58 0f 85 88 07 00 00 bf 01
RSP: 0018:ffffc90002f777c0 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000068 RCX: 0000000000000001
RDX: 0000000000000018 RSI: ffffffff8e36c2b4 RDI: 00000000000000c0
RBP: ffffc90002f77930 R08: ffffffff88419d25 R09: 0000000000000000
R10: ffffc90002f77948 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  00007f784f6a56c0(0000) GS:ffff888123c53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d210ff8 CR3: 00000000580a3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dvb_usbv2_generic_write+0x25/0x50 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77
 mxl111sf_ctrl_msg+0x179/0x2b0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73
 mxl111sf_write_reg+0x96/0x130 drivers/media/usb/dvb-usb-v2/mxl111sf.c:123
 mxl111sf_i2c_start+0x6e/0x220 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:130
 mxl111sf_i2c_sw_xfer_msg drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:234 [inline]
 mxl111sf_i2c_xfer+0x10a3/0x3240 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813
 __i2c_transfer+0x5d4/0x1740 drivers/i2c/i2c-core-base.c:2294
 i2c_transfer+0x158/0x380 drivers/i2c/i2c-core-base.c:2350
 i2cdev_ioctl_rdwr+0x3ec/0x700 drivers/i2c/i2c-dev.c:306
 i2cdev_ioctl+0x19d/0x830 drivers/i2c/i2c-dev.c:467
 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:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f784e79e159
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:00007f784f6a5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f784ea25fa0 RCX: 00007f784e79e159
RDX: 0000200000000300 RSI: 0000000000000707 RDI: 0000000000000005
RBP: 00007f784e83506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f784ea26038 R14: 00007f784ea25fa0 R15: 00007ffc963bb0a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x15d/0x1bd0 kernel/locking/mutex.c:821
Code: 08 84 d2 0f 85 62 14 00 00 44 8b 0d fd a7 c7 0f 45 85 c9 75 29 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 59 14 00 00 48 3b 5b 58 0f 85 88 07 00 00 bf 01
RSP: 0018:ffffc90002f777c0 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000068 RCX: 0000000000000001
RDX: 0000000000000018 RSI: ffffffff8e36c2b4 RDI: 00000000000000c0
RBP: ffffc90002f77930 R08: ffffffff88419d25 R09: 0000000000000000
R10: ffffc90002f77948 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  00007f784f6a56c0(0000) GS:ffff888123c53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fdee8e7950 CR3: 00000000580a3000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	08 84 d2 0f 85 62 14 	or     %al,0x1462850f(%rdx,%rdx,8)
   7:	00 00                	add    %al,(%rax)
   9:	44 8b 0d fd a7 c7 0f 	mov    0xfc7a7fd(%rip),%r9d        # 0xfc7a80d
  10:	45 85 c9             	test   %r9d,%r9d
  13:	75 29                	jne    0x3e
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 8d 7b 58          	lea    0x58(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 59 14 00 00    	jne    0x148d
  34:	48 3b 5b 58          	cmp    0x58(%rbx),%rbx
  38:	0f 85 88 07 00 00    	jne    0x7c6
  3e:	bf                   	.byte 0xbf
  3f:	01                   	.byte 0x1