RAX: ffffffffffffffda RBX: 00007ff7012026d4 RCX: 0000000000454e79
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00000000200007c0
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080c400 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000003fa R14: 00000000006f8010 R15: 0000000000000022
WARNING: CPU: 0 PID: 17599 at fs/super.c:1148 kill_block_super+0xc9/0xf0 fs/super.c:1148
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 17599 Comm: syz-executor3 Not tainted 4.16.0-rc7+ #8
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+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x1f4/0x2b0 lib/bug.c:186
 fixup_bug.part.10+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+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kill_block_super+0xc9/0xf0 fs/super.c:1148
RSP: 0018:ffff8801b47977c8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8801a9dc4340 RCX: ffffffff81b11e79
RDX: 0000000000040000 RSI: ffffc90003ec9000 RDI: ffff8801c96f39e0
RBP: ffff8801b47977e0 R08: 0000000000000000 R09: 1ffff100368f2eaa
R10: ffff8801b4797590 R11: 0000000000000001 R12: ffff8801c96f3640
R13: 0000000000000000 R14: ffff8801b4797a10 R15: ffff8801a9dc4340
 deactivate_locked_super+0x88/0xd0 fs/super.c:312
 sget_userns+0xbda/0xe40 fs/super.c:522
 sget+0xd2/0x120 fs/super.c:557
 mount_bdev+0x109/0x370 fs/super.c:1092
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1770
 mount_fs+0x66/0x2d0 fs/super.c:1222
 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:2509 [inline]
 do_new_mount fs/namespace.c:2512 [inline]
 do_mount+0xea4/0x2bb0 fs/namespace.c:2842
 SYSC_mount fs/namespace.c:3058 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3035
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007ff701201c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff7012026d4 RCX: 0000000000454e79
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00000000200007c0
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080c400 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000003fa R14: 00000000006f8010 R15: 0000000000000022
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..