------------[ cut here ]------------ WARNING: CPU: 1 PID: 9198 at drivers/tty/tty_ioctl.c:319 tty_set_termios.cold+0x11/0x23 drivers/tty/tty_ioctl.c:319 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9198 Comm: kworker/u5:1 Not tainted 5.3.0-rc1-next-20190724 #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci0 hci_power_on Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2dc/0x755 kernel/panic.c:219 __warn.cold+0x20/0x4c kernel/panic.c:576 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1026 RIP: 0010:tty_set_termios.cold+0x11/0x23 drivers/tty/tty_ioctl.c:319 Code: ef e8 96 d2 2b fe e9 e8 fe ff ff e8 8c d2 2b fe eb ae e8 85 d2 2b fe eb 84 e8 be 8e f1 fd 48 c7 c7 e0 e0 d0 87 e8 c6 2e db fd <0f> 0b e9 d5 d5 ff ff 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 RSP: 0018:ffff888060bbf978 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff888060bbfa38 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815c62a6 RDI: ffffed100c177f21 RBP: ffff888060bbfa60 R08: 0000000000000024 R09: ffffed1015d260b1 R10: ffffed1015d260b0 R11: ffff8880ae930587 R12: ffff888060bbfaa0 R13: 0000000000010004 R14: 1ffff1100c177f4e R15: ffff888088b74a00 hci_uart_set_baudrate+0x157/0x1c0 drivers/bluetooth/hci_ldisc.c:371 hci_uart_setup+0xa2/0x4a0 drivers/bluetooth/hci_ldisc.c:394 hci_dev_do_open+0x3e3/0x1940 net/bluetooth/hci_core.c:1450 hci_power_on+0x12d/0x680 net/bluetooth/hci_core.c:2171 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..