WARNING: CPU: 0 PID: 23779 at fs/block_dev.c:1899 __blkdev_put+0x6ba/0x810 fs/block_dev.c:1899
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 23779 Comm: blkid Not tainted 5.3.0-rc3-next-20190809 #63
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2dc/0x755 kernel/panic.c:220
 __warn.cold+0x20/0x4c kernel/panic.c:584
 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:1028
RIP: 0010:__blkdev_put+0x6ba/0x810 fs/block_dev.c:1899
Code: 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 84 24 fd ff ff 48 8b bd 50 ff ff ff e8 90 5d e6 ff e9 13 fd ff ff e8 46 6f ab ff <0f> 0b e9 dc fa ff ff 48 89 cf e8 57 5d e6 ff e9 6a fa ff ff 48 8b
RSP: 0018:ffff88805a40fc90 EFLAGS: 00010293
RAX: ffff8880636386c0 RBX: ffff888092bd4200 RCX: ffffffff81c6a4c4
RDX: 0000000000000000 RSI: ffffffff81c6a9ea RDI: 0000000000000005
RBP: ffff88805a40fd88 R08: ffff8880636386c0 R09: ffffed101257a844
R10: ffff88805a40fc80 R11: ffff888092bd421f R12: 0000000000000002
R13: dffffc0000000000 R14: ffff888092bd4218 R15: ffff888092bd4218
 blkdev_put+0x98/0x560 fs/block_dev.c:1969
 blkdev_close+0x8b/0xb0 fs/block_dev.c:1976
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd7a33612b0
Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24
RSP: 002b:00007fffe588e528 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd7a33612b0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000f94030
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005
Kernel Offset: disabled
Rebooting in 86400 seconds..