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: 4489 Comm: syz.0.38 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline] RIP: 0010:__mutex_lock+0xe8/0xaf0 kernel/locking/mutex.c:747 Code: c0 40 01 c0 96 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 6c 09 00 00 83 3d c5 11 89 0c 00 75 21 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 fc 91 9c f7 48 39 5b 60 0f 85 ef 08 00 00 RSP: 0018:ffffc900051870e0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000068 RCX: ffffffff96c00103 RDX: ffff88802c259dc0 RSI: ffffffff8a8c22a0 RDI: 00000000000000c8 RBP: ffffc90005187238 R08: ffffffff86dd3f22 R09: 1ffff1100f95352b R10: dffffc0000000000 R11: ffffed100f95352c R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88807ca9a958 R15: 0000000000000000 FS: 00007fc8df4356c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8df434ff8 CR3: 000000007e03f000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dvb_usbv2_generic_write+0x22/0x50 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x15e/0x2c0 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+0x880/0x22b0 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:469 [inline] __i2c_smbus_xfer+0x104b/0x2030 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:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc8de59c819 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:00007fc8df435028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc8de816180 RCX: 00007fc8de59c819 RDX: 0000200000000100 RSI: 0000000000000720 RDI: 000000000000000a RBP: 00007fc8de632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8de816218 R14: 00007fc8de816180 R15: 00007ffe61de4498 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline] RIP: 0010:__mutex_lock+0xe8/0xaf0 kernel/locking/mutex.c:747 Code: c0 40 01 c0 96 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 6c 09 00 00 83 3d c5 11 89 0c 00 75 21 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 fc 91 9c f7 48 39 5b 60 0f 85 ef 08 00 00 RSP: 0018:ffffc900051870e0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000068 RCX: ffffffff96c00103 RDX: ffff88802c259dc0 RSI: ffffffff8a8c22a0 RDI: 00000000000000c8 RBP: ffffc90005187238 R08: ffffffff86dd3f22 R09: 1ffff1100f95352b R10: dffffc0000000000 R11: ffffed100f95352c R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88807ca9a958 R15: 0000000000000000 FS: 00007fc8df4356c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f71bff8 CR3: 000000007e03f000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c0 40 01 c0 rolb $0xc0,0x1(%rax) 4: 96 xchg %eax,%esi 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax e: 84 c0 test %al,%al 10: 0f 85 6c 09 00 00 jne 0x982 16: 83 3d c5 11 89 0c 00 cmpl $0x0,0xc8911c5(%rip) # 0xc8911e2 1d: 75 21 jne 0x40 1f: 48 8d 7b 60 lea 0x60(%rbx),%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 fc 91 9c f7 call 0xf79c9232 36: 48 39 5b 60 cmp %rbx,0x60(%rbx) 3a: 0f 85 ef 08 00 00 jne 0x92f