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: 12701 Comm: syz.3.1486 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:593 [inline] RIP: 0010:__mutex_lock+0x14b/0x1300 kernel/locking/mutex.c:776 Code: 80 04 27 9a 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 e4 0f 00 00 83 3d 73 7e 78 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 59 2f 81 f6 4d 39 64 24 60 0f 85 10 0f 00 RSP: 0018:ffffc9000e99efa0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 1ffff92001d33e0c RCX: ffffffff9a270403 RDX: 0000000000000000 RSI: ffffffff8e161e0a RDI: 00000000000000c8 RBP: ffffc9000e99f158 R08: ffffc9000e99f0c7 R09: 0000000000000000 R10: ffffc9000e99f0a0 R11: fffff52001d33e19 R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125466000(0063) knlGS:00000000f5021b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c3a460d CR3: 00000000766b0000 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+0xa9/0x1b0 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+0x496/0x5100 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x79a/0x2020 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:470 [inline] __i2c_smbus_xfer+0xfca/0x1f70 drivers/i2c/i2c-core-smbus.c:608 i2c_smbus_xfer+0x1f4/0x310 drivers/i2c/i2c-core-smbus.c:546 i2cdev_ioctl_smbus+0x434/0x730 drivers/i2c/i2c-dev.c:389 compat_i2cdev_ioctl+0x29d/0x5c0 drivers/i2c/i2c-dev.c:585 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x20d/0x640 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fc4f6c Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 58 b8 77 00 00 00 cd 80 0f 0b 90 90 90 90 90 90 b8 ad RSP: 002b:00000000f502150c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000000000720 RDX: 0000000080000140 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+0x14b/0x1300 kernel/locking/mutex.c:776 Code: 80 04 27 9a 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 e4 0f 00 00 83 3d 73 7e 78 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 59 2f 81 f6 4d 39 64 24 60 0f 85 10 0f 00 RSP: 0018:ffffc9000e99efa0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 1ffff92001d33e0c RCX: ffffffff9a270403 RDX: 0000000000000000 RSI: ffffffff8e161e0a RDI: 00000000000000c8 RBP: ffffc9000e99f158 R08: ffffc9000e99f0c7 R09: 0000000000000000 R10: ffffc9000e99f0a0 R11: fffff52001d33e19 R12: 0000000000000068 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125566000(0063) knlGS:00000000f5021b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fa8eff46e9c CR3: 00000000766b0000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 80 04 27 9a addb $0x9a,(%rdi,%riz,1) 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 e4 0f 00 00 jne 0xff9 15: 83 3d 73 7e 78 0e 00 cmpl $0x0,0xe787e73(%rip) # 0xe787e8f 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 59 2f 81 f6 call 0xf6812f8f 36: 4d 39 64 24 60 cmp %r12,0x60(%r12) 3b: 0f .byte 0xf 3c: 85 10 test %edx,(%rax) 3e: 0f .byte 0xf