RAX: ffffffffffffffda RBX: 00007f0b569f26d4 RCX: 0000000000455319
RDX: 0000000020000440 RSI: 0000000000005423 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015
R13: 000000000000031b R14: 00000000006f7b28 R15: 0000000000000001
WARNING: CPU: 1 PID: 16952 at drivers/tty/tty_ldisc.c:531 tty_ldisc_restore drivers/tty/tty_ldisc.c:531 [inline]
WARNING: CPU: 1 PID: 16952 at drivers/tty/tty_ldisc.c:531 tty_set_ldisc+0x53d/0x870 drivers/tty/tty_ldisc.c:599
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 16952 Comm: syz-executor1 Not tainted 4.16.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:tty_ldisc_restore drivers/tty/tty_ldisc.c:531 [inline]
RIP: 0010:tty_set_ldisc+0x53d/0x870 drivers/tty/tty_ldisc.c:599
RSP: 0018:ffff8801b4ef79c8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8801b1553600 RCX: ffffc900088ed000
RDX: 0000000000040000 RSI: ffffffff837bfafd RDI: 0000000000000007
RBP: ffff8801b4ef7a18 R08: ffff8801bc43c200 R09: 0000000000000006
R10: ffff8801bc43c200 R11: 0000000000000000 R12: ffff8801b1553b70
R13: 00000000ffffffff R14: fffffffffffffff4 R15: ffff8801d4c50bc0
 tiocsetd drivers/tty/tty_io.c:2336 [inline]
 tty_ioctl+0x3ad/0x1870 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455319
RSP: 002b:00007f0b569f1c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0b569f26d4 RCX: 0000000000455319
RDX: 0000000020000440 RSI: 0000000000005423 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015
R13: 000000000000031b R14: 00000000006f7b28 R15: 0000000000000001
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..