general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 0 PID: 5431 Comm: syz.4.21 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__mutex_lock_common+0x104/0x2400 kernel/locking/mutex.c:575 Code: 04 18 84 c0 0f 85 66 1c 00 00 48 8d bc 24 e0 00 00 00 83 3d ed 01 69 0c 00 75 30 48 8b 04 24 48 8d 78 60 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 71 a0 f9 f7 48 8b 04 24 48 39 40 60 48 8d bc RSP: 0018:ffffc9000371f0a0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: dffffc0000000000 RCX: ffffffff962d8f03 RDX: ffff888027770000 RSI: ffffffff8a2b3a20 RDI: 00000000000000c8 RBP: ffffc9000371f228 R08: ffffffff86928882 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed10044a1a2c R12: 0000000000000000 R13: 1ffff920006e3e2c R14: ffffffff86928882 R15: 0000000000000000 FS: 00007fb7819456c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff983f4b2fe CR3: 000000005b49b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 dvb_usbv2_generic_write+0x22/0x50 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x12a/0x260 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73 mxl111sf_write_reg+0xa6/0x180 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+0x493/0x50d0 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x880/0x20b0 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:469 [inline] __i2c_smbus_xfer+0x1015/0x1dc0 drivers/i2c/i2c-core-smbus.c:607 i2c_smbus_xfer+0x272/0x3b0 drivers/i2c/i2c-core-smbus.c:545 i2cdev_ioctl_smbus+0x432/0x680 drivers/i2c/i2c-dev.c:381 i2cdev_ioctl+0x583/0x7b0 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb7822e1679 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:00007fb781945028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb78254cfa0 RCX: 00007fb7822e1679 RDX: 00002000000001c0 RSI: 0000000000000720 RDI: 0000000000000003 RBP: 00007fb782374ee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb78254d038 R14: 00007fb78254cfa0 R15: 00007ffd47f117c8 Modules linked in: ---[ end trace 8941c01c72de9557 ]--- RIP: 0010:__mutex_lock_common+0x104/0x2400 kernel/locking/mutex.c:575 Code: 04 18 84 c0 0f 85 66 1c 00 00 48 8d bc 24 e0 00 00 00 83 3d ed 01 69 0c 00 75 30 48 8b 04 24 48 8d 78 60 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 71 a0 f9 f7 48 8b 04 24 48 39 40 60 48 8d bc RSP: 0018:ffffc9000371f0a0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: dffffc0000000000 RCX: ffffffff962d8f03 RDX: ffff888027770000 RSI: ffffffff8a2b3a20 RDI: 00000000000000c8 RBP: ffffc9000371f228 R08: ffffffff86928882 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed10044a1a2c R12: 0000000000000000 R13: 1ffff920006e3e2c R14: ffffffff86928882 R15: 0000000000000000 FS: 00007fb7819456c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd09854ad58 CR3: 000000005b49b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 04 18 add $0x18,%al 2: 84 c0 test %al,%al 4: 0f 85 66 1c 00 00 jne 0x1c70 a: 48 8d bc 24 e0 00 00 lea 0xe0(%rsp),%rdi 11: 00 12: 83 3d ed 01 69 0c 00 cmpl $0x0,0xc6901ed(%rip) # 0xc690206 19: 75 30 jne 0x4b 1b: 48 8b 04 24 mov (%rsp),%rax 1f: 48 8d 78 60 lea 0x60(%rax),%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 71 a0 f9 f7 call 0xf7f9a0a6 35: 48 8b 04 24 mov (%rsp),%rax 39: 48 39 40 60 cmp %rax,0x60(%rax) 3d: 48 rex.W 3e: 8d .byte 0x8d 3f: bc .byte 0xbc