------------[ cut here ]------------
 ext4_mkdir+0x2e4/0xbd0 fs/ext4/namei.c:2701
WARNING: CPU: 1 PID: 7068 at fs/super.c:1163 kill_block_super+0xbe/0xe0 fs/super.c:1163
Kernel panic - not syncing: panic_on_warn set ...

 vfs_mkdir+0x463/0x6e0 fs/namei.c:3849
 SYSC_mkdirat fs/namei.c:3872 [inline]
 SyS_mkdirat+0x1fd/0x270 fs/namei.c:3856
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fc54bf55317
RSP: 002b:00007fc54a8caf88 EFLAGS: 00000213 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fc54bf55317
RDX: 00000000000001ff RSI: 0000000020000080 RDI: 00000000ffffff9c
RBP: 00007fc54a8cb1d0 R08: 0000000000000000 R09: 00007fc54a8cb1d0
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000040
R13: 0000000020000080 R14: 00007fc54a8cafe0 R15: 0000000020000240
CPU: 1 PID: 7068 Comm: syz-executor.0 Not tainted 4.14.290-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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:ffff88807d987bc8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90005c9c000
RDX: 0000000000040000 RSI: ffffffff81875ece RDI: ffff8880a585e5f0
RBP: ffff888098178000 R08: ffffffff8b9c9d68 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880a8efe4c0 R12: ffff8880a585e140
R13: ffffffff89202310 R14: ffffffff88f45760 R15: dffffc0000000000
 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: 0033:0x7fa967c1a73a
RSP: 002b:00007fa96658df88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fa967c1a73a
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fa96658dfe0
RBP: 00007fa96658e020 R08: 00007fa96658e020 R09: 0000000020000040
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000040
R13: 0000000020000080 R14: 00007fa96658dfe0 R15: 0000000020000240
Kernel Offset: disabled
Rebooting in 86400 seconds..