------------[ cut here ]------------ WARNING: CPU: 1 PID: 10073 at drivers/tty/tty_ioctl.c:319 tty_set_termios.cold+0x11/0x1f drivers/tty/tty_ioctl.c:319 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 10073 Comm: kworker/u5:1 Not tainted 4.19.63 #37 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+0x263/0x507 kernel/panic.c:185 __warn.cold+0x20/0x4a kernel/panic.c:540 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296 kobject: 'loop2' (000000004d49c703): kobject_uevent_env do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1035 RIP: 0010:tty_set_termios.cold+0x11/0x1f drivers/tty/tty_ioctl.c:319 Code: ff e8 c2 04 3b fe e9 f5 fe ff ff e8 b8 04 3b fe eb c7 e8 b1 04 3b fe eb 9d e8 9a 71 04 fe 48 c7 c7 40 d1 8c 87 e8 c2 e2 ee fd <0f> 0b e9 d1 d7 ff ff 90 90 90 90 90 90 90 55 48 89 e5 41 55 41 54 RSP: 0018:ffff88804f497990 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff88804f497a50 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8155d556 RDI: ffffed1009e92f24 RBP: ffff88804f497a78 R08: 0000000000000024 R09: ffffed1015d23ee3 kobject: 'loop2' (000000004d49c703): fill_kobj_path: path = '/devices/virtual/block/loop2' R10: ffffed1015d23ee2 R11: ffff8880ae91f717 R12: ffff88804f497ab8 R13: 0000000000010004 R14: 1ffff11009e92f51 R15: ffff888095600180 hci_uart_set_baudrate+0x157/0x1c0 drivers/bluetooth/hci_ldisc.c:378 hci_uart_setup+0xa2/0x490 drivers/bluetooth/hci_ldisc.c:401 hci_dev_do_open+0x674/0x14a0 net/bluetooth/hci_core.c:1423 hci_power_on+0x10d/0x580 net/bluetooth/hci_core.c:2130 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 kobject: 'kvm' (000000006efbdf22): kobject_uevent_env worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Kernel Offset: disabled Rebooting in 86400 seconds..