RDX: 0000000020000200 RSI: 00000000200001c0 RDI: 0000000020000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc1f0b79a8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1f0b781c
R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7967 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: 7967 Comm: syz-executor943 Not tainted 4.14.231-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:186
 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:ffff8880b30f7bb0 EFLAGS: 00010297
RAX: ffff8880b45b0340 RBX: 0000000000000000 RCX: 1ffff110168b617e
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88808e4095f0
RBP: ffff8880967fa180 R08: ffffffff8b9b33b0 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880b45b0340 R12: ffff88808e409140
R13: ffffffff890a2130 R14: ffffffff88f44f40 R15: dffffc0000000000
 cramfs_kill_sb+0x38/0x50 fs/cramfs/inode.c:247
 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:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x43ff39
RSP: 002b:00007ffc1f0b7808 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 000000000043ff39
RDX: 0000000020000200 RSI: 00000000200001c0 RDI: 0000000020000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc1f0b79a8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1f0b781c
R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488
Kernel Offset: disabled
Rebooting in 86400 seconds..