Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 1 UID: 0 PID: 6520 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:577 [inline] RIP: 0010:__mutex_lock+0x13b/0x1350 kernel/locking/mutex.c:760 Code: e0 b3 c5 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 2b 10 00 00 83 3d 33 8e 5e 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 15 c1 f6 4d 39 64 24 60 0f 85 51 0f 00 RSP: 0018:ffffc90003d97040 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffc90003d97120 RCX: ffffffff99c5b303 RDX: ffff888032c09e80 RSI: ffffffff8dc70348 RDI: 00000000000000c8 RBP: ffffc90003d971f8 R08: ffffc90003d97167 R09: 0000000000000000 R10: ffffc90003d97140 R11: fffff520007b2e2d R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa97d4956c0(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e563fff CR3: 000000007d432000 CR4: 00000000003526f0 Call Trace: dvb_usbv2_generic_write+0x26/0x60 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x172/0x310 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+0x874/0x21a0 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:470 [inline] __i2c_smbus_xfer+0xfb0/0x1e80 drivers/i2c/i2c-core-smbus.c:608 i2c_smbus_xfer+0x275/0x3c0 drivers/i2c/i2c-core-smbus.c:546 i2cdev_ioctl_smbus+0x3db/0x750 drivers/i2c/i2c-dev.c:389 i2cdev_ioctl+0x5d3/0x820 drivers/i2c/i2c-dev.c:478 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa97c58efc9 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:00007fa97d495038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa97c7e5fa0 RCX: 00007fa97c58efc9 RDX: 00002000000001c0 RSI: 0000000000000720 RDI: 0000000000000003 RBP: 00007fa97c611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa97c7e6038 R14: 00007fa97c7e5fa0 R15: 00007ffd2d194cc8 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: e0 b3 c5 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 2b 10 00 00 83 3d 33 8e 5e 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 15 c1 f6 4d 39 64 24 60 0f 85 51 0f 00 RSP: 0018:ffffc90003d97040 EFLAGS: 00010202 RAX: 0000000000000019 RBX: ffffc90003d97120 RCX: ffffffff99c5b303 RDX: ffff888032c09e80 RSI: ffffffff8dc70348 RDI: 00000000000000c8 RBP: ffffc90003d971f8 R08: ffffc90003d97167 R09: 0000000000000000 R10: ffffc90003d97140 R11: fffff520007b2e2d R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa97d4956c0(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056070c0ae6e0 CR3: 000000007d432000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: b3 c5 mov $0xc5,%bl 2: 99 cltd 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 33 8e 5e 0e 00 cmpl $0x0,0xe5e8e33(%rip) # 0xe5e8e4e 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 15 c1 f6 call 0xf6c1157e 35: 4d 39 64 24 60 cmp %r12,0x60(%r12) 3a: 0f .byte 0xf 3b: 85 51 0f test %edx,0xf(%rcx)