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: 23562 Comm: syz.1.4083 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:ffffc900037e7240 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffc900037e7320 RCX: ffffffff998b5403 RDX: 0000000000000000 RSI: ffffffff8d975eae RDI: 00000000000000c8 RBP: ffffc900037e73f8 R08: ffffc900037e7367 R09: 0000000000000000 R10: ffffc900037e7340 R11: fffff520006fce6d R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125e1f000(0063) knlGS:00000000f544db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000030e1eff8 CR3: 0000000027f92000 CR4: 00000000003526f0 Call Trace: 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 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+0x1dc/0x560 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332 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 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:ffffc900037e7240 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffc900037e7320 RCX: ffffffff998b5403 RDX: 0000000000000000 RSI: ffffffff8d975eae RDI: 00000000000000c8 RBP: ffffc900037e73f8 R08: ffffc900037e7367 R09: 0000000000000000 R10: ffffc900037e7340 R11: fffff520006fce6d R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125e1f000(0063) knlGS:00000000f544db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080156018 CR3: 0000000027f92000 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)