bucket incorrectly unset in freespace btree
  u64s 5 type deleted 0:29:0 len 0 ver 0, , continuing
=====================================================
BUG: KMSAN: uninit-value in bch2_alloc_v4_validate+0x73f/0x1c10 fs/bcachefs/alloc_background.c:249
 bch2_alloc_v4_validate+0x73f/0x1c10 fs/bcachefs/alloc_background.c:249
 bch2_bkey_val_validate+0x357/0x530 fs/bcachefs/bkey_methods.c:143
 btree_node_bkey_val_validate fs/bcachefs/btree_io.c:838 [inline]
 bset_key_validate fs/bcachefs/btree_io.c:859 [inline]
 validate_bset_keys+0x20e3/0x2350 fs/bcachefs/btree_io.c:942
 validate_bset_for_write+0x2b3/0x410 fs/bcachefs/btree_io.c:1987
 __bch2_btree_node_write+0x5436/0x6870 fs/bcachefs/btree_io.c:2197
 bch2_btree_node_write_trans+0x2fd/0x890 fs/bcachefs/btree_io.c:2369
 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:818 [inline]
 btree_interior_update_work+0x3eac/0x4830 fs/bcachefs/btree_update_interior.c:846
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was stored to memory at:
 __bkey_val_copy fs/bcachefs/btree_iter.h:609 [inline]
 bch2_alloc_v4_validate+0x215/0x1c10 fs/bcachefs/alloc_background.c:247
 bch2_bkey_val_validate+0x357/0x530 fs/bcachefs/bkey_methods.c:143
 btree_node_bkey_val_validate fs/bcachefs/btree_io.c:838 [inline]
 bset_key_validate fs/bcachefs/btree_io.c:859 [inline]
 validate_bset_keys+0x20e3/0x2350 fs/bcachefs/btree_io.c:942
 validate_bset_for_write+0x2b3/0x410 fs/bcachefs/btree_io.c:1987
 __bch2_btree_node_write+0x5436/0x6870 fs/bcachefs/btree_io.c:2197
 bch2_btree_node_write_trans+0x2fd/0x890 fs/bcachefs/btree_io.c:2369
 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:818 [inline]
 btree_interior_update_work+0x3eac/0x4830 fs/bcachefs/btree_update_interior.c:846
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was stored to memory at:
 memcpy_u64s_small fs/bcachefs/util.h:416 [inline]
 bkey_p_copy fs/bcachefs/bkey.h:40 [inline]
 bch2_sort_keys_keep_unwritten_whiteouts+0x14ab/0x1840 fs/bcachefs/bkey_sort.c:187
 __bch2_btree_node_write+0x3b3f/0x6870 fs/bcachefs/btree_io.c:2140
 bch2_btree_node_write_trans+0x2fd/0x890 fs/bcachefs/btree_io.c:2369
 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:818 [inline]
 btree_interior_update_work+0x3eac/0x4830 fs/bcachefs/btree_update_interior.c:846
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4249
 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4266
 __do_kmalloc_node mm/slub.c:4282 [inline]
 __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4300
 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:662
 btree_node_data_alloc fs/bcachefs/btree_cache.c:156 [inline]
 __bch2_btree_node_mem_alloc+0x2be/0xa80 fs/bcachefs/btree_cache.c:201
 bch2_fs_btree_cache_init+0x4f0/0xb60 fs/bcachefs/btree_cache.c:655
 bch2_fs_alloc fs/bcachefs/super.c:919 [inline]
 bch2_fs_open+0x4d84/0x5ba0 fs/bcachefs/super.c:2064
 bch2_fs_get_tree+0x98a/0x24e0 fs/bcachefs/fs.c:2190
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560
 path_mount+0x742/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x71f/0x800 fs/namespace.c:4088
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088
 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 3661 Comm: kworker/u8:12 Tainted: G        W          6.14.0-rc4-syzkaller-00073-g5394eea10651 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: btree_update btree_interior_update_work
=====================================================