BUG: memory leak
unreferenced object 0xffff88811e788000 (size 4096):
  comm "syz-executor", pid 5223, jiffies 4294942299
  hex dump (first 32 bytes):
    6c 01 00 00 06 00 00 00 00 00 00 00 00 00 00 00  l...............
    0a 00 00 00 00 00 00 00 01 00 01 00 05 00 00 00  ................
  backtrace (crc babc5d23):
    [<ffffffff81667cea>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
    [<ffffffff81667cea>] slab_post_alloc_hook mm/slub.c:3875 [inline]
    [<ffffffff81667cea>] slab_alloc_node mm/slub.c:3918 [inline]
    [<ffffffff81667cea>] __do_kmalloc_node mm/slub.c:4038 [inline]
    [<ffffffff81667cea>] __kmalloc_node_track_caller+0x32a/0x430 mm/slub.c:4059
    [<ffffffff815d9a09>] kmemdup+0x29/0x60 mm/util.c:131
    [<ffffffff8251e528>] kmemdup include/linux/fortify-string.h:743 [inline]
    [<ffffffff8251e528>] bch2_read_superblock_clean+0x58/0x170 fs/bcachefs/sb-clean.c:161
    [<ffffffff825128d6>] bch2_fs_recovery+0x76/0x1f20 fs/bcachefs/recovery.c:573
    [<ffffffff8253c273>] bch2_fs_start+0x573/0x720 fs/bcachefs/super.c:1043
    [<ffffffff8253f468>] bch2_fs_open+0xb38/0xb80 fs/bcachefs/super.c:2105
    [<ffffffff82496dc5>] bch2_mount+0x8c5/0xac0 fs/bcachefs/fs.c:1906
    [<ffffffff81791b69>] legacy_get_tree+0x29/0x90 fs/fs_context.c:662
    [<ffffffff8171b04d>] vfs_get_tree+0x2d/0x120 fs/super.c:1779
    [<ffffffff817669e7>] do_new_mount fs/namespace.c:3352 [inline]
    [<ffffffff817669e7>] path_mount+0xc97/0x10d0 fs/namespace.c:3679
    [<ffffffff817675b5>] do_mount fs/namespace.c:3692 [inline]
    [<ffffffff817675b5>] __do_sys_mount fs/namespace.c:3898 [inline]
    [<ffffffff817675b5>] __se_sys_mount fs/namespace.c:3875 [inline]
    [<ffffffff817675b5>] __x64_sys_mount+0x1a5/0x1f0 fs/namespace.c:3875
    [<ffffffff85122ee0>] do_syscall_x64 arch/x86/entry/common.c:52 [inline]
    [<ffffffff85122ee0>] do_syscall_64+0xa0/0x1d0 arch/x86/entry/common.c:83
    [<ffffffff85200130>] entry_SYSCALL_64_after_hwframe+0x77/0x7f