R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c76
R13: 00007fe50e0f4bc8 R14: 00000000004b7c76 R15: 0000000000000000
WARNING: CPU: 1 PID: 10009 at drivers/tty/tty_ldisc.c:531 tty_ldisc_restore drivers/tty/tty_ldisc.c:531 [inline]
WARNING: CPU: 1 PID: 10009 at drivers/tty/tty_ldisc.c:531 tty_set_ldisc+0x4c6/0x7a0 drivers/tty/tty_ldisc.c:599
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10009 Comm: syz-executor0 Not tainted 4.15.0-rc8+ #270
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1096
RIP: 0010:tty_ldisc_restore drivers/tty/tty_ldisc.c:531 [inline]
RIP: 0010:tty_set_ldisc+0x4c6/0x7a0 drivers/tty/tty_ldisc.c:599
RSP: 0018:ffff8801c64b7b38 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801d409d240 RCX: ffffffff82908056
RDX: 000000000000a7bd RSI: ffffc9000189f000 RDI: 0000000000000282
RBP: ffff8801c64b7b88 R08: 1ffff10038c96f27 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: ffff8801d409d7b0 R14: ffff8801d02f4dc0 R15: fffffffffffffff4
 tiocsetd drivers/tty/tty_io.c:2319 [inline]
 tty_ioctl+0x492/0x1610 drivers/tty/tty_io.c:2563
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ee9
RSP: 002b:00007fe50e0f4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe50e0f4aa0 RCX: 0000000000452ee9
RDX: 0000000020be4ffc RSI: 0000000000005423 RDI: 0000000000000014
RBP: 00007fe50e0f4a90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c76
R13: 00007fe50e0f4bc8 R14: 00000000004b7c76 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..