general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 1 PID: 4693 Comm: syz.4.76 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__mutex_lock_common+0x109/0x2390 kernel/locking/mutex.c:575 Code: 8d bc 24 e0 00 00 00 83 3d 03 7c 5a 0c 00 4c 8b 74 24 18 75 32 49 8d 7e 60 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 bc 6e 0a f8 4d 39 76 60 48 8d bc 24 e0 00 00 RSP: 0018:ffffc90003fdf0c0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffffff868114a2 RCX: dffffc0000000000 RDX: ffff88801e358000 RSI: ffffffff8a0b2b40 RDI: 00000000000000c8 RBP: ffffc90003fdf248 R08: ffffffff868114a2 R09: 0000000000000000 R10: ffffed100511062c R11: 1ffff1100511062b R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000068 R15: 0000000000000000 FS: 00007efdc3f676c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efdc3f66f98 CR3: 00000000732f6000 CR4: 00000000003506e0 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+0x9d/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+0x45e/0x4ed0 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x864/0x2060 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:469 [inline] __i2c_smbus_xfer+0xfc9/0x1d50 drivers/i2c/i2c-core-smbus.c:607 i2c_smbus_xfer+0x263/0x3a0 drivers/i2c/i2c-core-smbus.c:545 i2cdev_ioctl_smbus+0x3e3/0x650 drivers/i2c/i2c-dev.c:381 i2cdev_ioctl+0x545/0x750 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: 0033:0x7efdc5d20fc9 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:00007efdc3f67038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007efdc5f78090 RCX: 00007efdc5d20fc9 RDX: 00002000000001c0 RSI: 0000000000000720 RDI: 0000000000000004 RBP: 00007efdc5da3f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efdc5f78128 R14: 00007efdc5f78090 R15: 00007ffd1a262f58 Modules linked in: ---[ end trace cb761eed0794fb68 ]--- RIP: 0010:__mutex_lock_common+0x109/0x2390 kernel/locking/mutex.c:575 Code: 8d bc 24 e0 00 00 00 83 3d 03 7c 5a 0c 00 4c 8b 74 24 18 75 32 49 8d 7e 60 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 bc 6e 0a f8 4d 39 76 60 48 8d bc 24 e0 00 00 RSP: 0018:ffffc90003fdf0c0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffffff868114a2 RCX: dffffc0000000000 RDX: ffff88801e358000 RSI: ffffffff8a0b2b40 RDI: 00000000000000c8 RBP: ffffc90003fdf248 R08: ffffffff868114a2 R09: 0000000000000000 R10: ffffed100511062c R11: 1ffff1100511062b R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000068 R15: 0000000000000000 FS: 00007efdc3f676c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003840 CR3: 00000000732f6000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8d bc 24 e0 00 00 00 lea 0xe0(%rsp),%edi 7: 83 3d 03 7c 5a 0c 00 cmpl $0x0,0xc5a7c03(%rip) # 0xc5a7c11 e: 4c 8b 74 24 18 mov 0x18(%rsp),%r14 13: 75 32 jne 0x47 15: 49 8d 7e 60 lea 0x60(%r14),%rdi 19: 48 89 f8 mov %rdi,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 bc 6e 0a f8 call 0xf80a6ef1 35: 4d 39 76 60 cmp %r14,0x60(%r14) 39: 48 rex.W 3a: 8d .byte 0x8d 3b: bc 24 e0 00 00 mov $0xe024,%esp