RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 0000000000455259
RDX: 00000000004b9bc5 RSI: 0000000020000040 RDI: 0000000020000000
RBP: 0000000020000000 R08: 00007f95e4cadb20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
WARNING: CPU: 0 PID: 4796 at fs/super.c:1148 kill_block_super+0xd9/0x100 fs/super.c:1148
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4796 Comm: syz-executor4 Not tainted 4.16.0+ #17
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+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:183
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:547
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 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:991
RIP: 0010:kill_block_super+0xd9/0x100 fs/super.c:1148
RSP: 0018:ffff8801c53f7750 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900046bc000
RDX: 0000000000040000 RSI: ffffffff81bc68a9 RDI: 0000000000000005
RBP: ffff8801c53f7768 R08: ffff8801b3438740 R09: ffffed0038a7eeac
R10: ffffed0038a7eeac R11: 0000000000000003 R12: ffff8801da806040
R13: 0000000000000000 R14: ffff8801b2576a80 R15: dffffc0000000000
 fuse_kill_sb_blk+0x90/0xb0 fs/fuse/inode.c:1235
 deactivate_locked_super+0x97/0x100 fs/super.c:312
 sget_userns+0xc9d/0xf20 fs/super.c:522
 sget+0x10b/0x150 fs/super.c:557
 mount_bdev+0x111/0x3e0 fs/super.c:1092
 fuse_mount_blk+0x34/0x40 fs/fuse/inode.c:1222
 mount_fs+0xae/0x328 fs/super.c:1222
 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2517 [inline]
 do_mount+0x564/0x3070 fs/namespace.c:2847
 ksys_mount+0x12d/0x140 fs/namespace.c:3063
 SYSC_mount fs/namespace.c:3077 [inline]
 SyS_mount+0x35/0x50 fs/namespace.c:3074
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455259
RSP: 002b:00007f95e4cadb08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 0000000000455259
RDX: 00000000004b9bc5 RSI: 0000000020000040 RDI: 0000000020000000
RBP: 0000000020000000 R08: 00007f95e4cadb20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..