Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f] CPU: 1 UID: 0 PID: 7095 Comm: syz.4.355 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026 RIP: 0010:keyspan_break_ctl+0x8e/0xe0 drivers/usb/serial/keyspan.c:608 Code: ff ff ff e8 74 8a 41 fa 83 fb ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 9c 00 00 00 0f 94 c3 48 89 fa 0f b6 db 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 41 RSP: 0018:ffffc900020bfcb0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87ca8d0c RDX: 0000000000000013 RSI: 00000000ffffffff RDI: 000000000000009c RBP: ffff888026a46000 R08: 0000000000000005 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802b202020 R14: ffff88802b2020c8 R15: 0000000000000007 FS: 00007fac507c56c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c36f6bd CR3: 0000000021348000 CR4: 00000000003526f0 Call Trace: serial_break+0xcb/0x160 drivers/usb/serial/usb-serial.c:538 send_break drivers/tty/tty_io.c:2458 [inline] send_break+0x2ec/0x370 drivers/tty/tty_io.c:2441 tty_ioctl+0xa2c/0x1640 drivers/tty/tty_io.c:2733 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fac4f99e159 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:00007fac507c5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fac4fc26090 RCX: 00007fac4f99e159 RDX: 0000000000000007 RSI: 0000000000005425 RDI: 0000000000000007 RBP: 00007fac4fa3503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fac4fc26128 R14: 00007fac4fc26090 R15: 00007ffed0475618 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:keyspan_break_ctl+0x8e/0xe0 drivers/usb/serial/keyspan.c:608 Code: ff ff ff e8 74 8a 41 fa 83 fb ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 9c 00 00 00 0f 94 c3 48 89 fa 0f b6 db 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 41 RSP: 0018:ffffc900020bfcb0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87ca8d0c RDX: 0000000000000013 RSI: 00000000ffffffff RDI: 000000000000009c RBP: ffff888026a46000 R08: 0000000000000005 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802b202020 R14: ffff88802b2020c8 R15: 0000000000000007 FS: 00007fac507c56c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c36f6bd CR3: 0000000021348000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff ljmp (bad) 1: e8 74 8a 41 fa call 0xfa418a7a 6: 83 fb ff cmp $0xffffffff,%ebx 9: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 10: fc ff df 13: 49 8d bc 24 9c 00 00 lea 0x9c(%r12),%rdi 1a: 00 1b: 0f 94 c3 sete %bl 1e: 48 89 fa mov %rdi,%rdx 21: 0f b6 db movzbl %bl,%ebx 24: 48 c1 ea 03 shr $0x3,%rdx * 28: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2c: 48 89 f8 mov %rdi,%rax 2f: 83 e0 07 and $0x7,%eax 32: 83 c0 03 add $0x3,%eax 35: 38 d0 cmp %dl,%al 37: 7c 04 jl 0x3d 39: 84 d2 test %dl,%dl 3b: 75 1d jne 0x5a 3d: 41 rex.B