RBP: 00007fff453f6e50 R08: 00007fff453f6e90 R09: 0000000000010440
R10: 0000000000010440 R11: 0000000000000286 R12: 0000000020000358
R13: 0000000000000004 R14: 0000000000000005 R15: 0000000000000001
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8310 at fs/super.c:1163 kill_block_super+0xbe/0xe0 fs/super.c:1163
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8310 Comm: syz-executor266 Not tainted 4.14.281-syzkaller #0
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+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:kill_block_super+0xbe/0xe0 fs/super.c:1163
RSP: 0018:ffff888094067bb0 EFLAGS: 00010297
RAX: ffff88809e166140 RBX: 0000000000000000 RCX: 1ffff11013c2cd3e
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880903ca630
RBP: ffff88809a092b00 R08: ffffffff8b9ddd18 R09: 0000000000000001
R10: 0000000000000000 R11: ffff88809e166140 R12: ffff8880903ca180
R13: ffffffff891bb330 R14: ffffffff88f45500 R15: dffffc0000000000
 efs_kill_sb+0x38/0x50 fs/efs/super.c:33
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 sget_userns+0x9c4/0xc10 fs/super.c:537
 sget+0xd1/0x110 fs/super.c:572
 mount_bdev+0xcd/0x360 fs/super.c:1107
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1d2abd36ea
RSP: 002b:00007fff453f6e38 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff453f6e90 RCX: 00007f1d2abd36ea
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 00007fff453f6e50
RBP: 00007fff453f6e50 R08: 00007fff453f6e90 R09: 0000000000010440
R10: 0000000000010440 R11: 0000000000000286 R12: 0000000020000358
R13: 0000000000000004 R14: 0000000000000005 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..