syzbot

bcachefs (loop2): done starting filesystem
overlay: ./file1 is not a directory
=====================================================
BUG: KMSAN: uninit-value in bch2_inode_unpack_v3 fs/bcachefs/inode.c:274 [inline]
BUG: KMSAN: uninit-value in bch2_inode_unpack+0x9fb/0x4ca0 fs/bcachefs/inode.c:331
 bch2_inode_unpack_v3 fs/bcachefs/inode.c:274 [inline]
 bch2_inode_unpack+0x9fb/0x4ca0 fs/bcachefs/inode.c:331
 __bch2_inode_peek+0x46d/0x890 fs/bcachefs/inode.c:357
 bch2_inode_peek fs/bcachefs/inode.h:127 [inline]
 bch2_create_trans+0x39b/0x2030 fs/bcachefs/fs-common.c:45
 __bch2_create+0x97e/0x1700 fs/bcachefs/fs.c:522
 bch2_mknod fs/bcachefs/fs.c:673 [inline]
 bch2_create+0xc0/0x1d0 fs/bcachefs/fs.c:687
 lookup_open fs/namei.c:3649 [inline]
 open_last_lookups fs/namei.c:3748 [inline]
 path_openat+0x2e9e/0x6200 fs/namei.c:3984
 do_filp_open+0x268/0x600 fs/namei.c:4014
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_openat fs/open.c:1433 [inline]
 __se_sys_openat fs/open.c:1428 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1428
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 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

Uninit was stored to memory at:
 memcpy_u64s_small fs/bcachefs/util.h:393 [inline]
 bkey_reassemble fs/bcachefs/bkey.h:513 [inline]
 btree_key_cache_create fs/bcachefs/btree_key_cache.c:259 [inline]
 btree_key_cache_fill+0xd1a/0x3d60 fs/bcachefs/btree_key_cache.c:309
 bch2_btree_path_traverse_cached+0x988/0xe20 fs/bcachefs/btree_key_cache.c:361
 bch2_btree_path_traverse_one+0x749/0x47b0 fs/bcachefs/btree_iter.c:1159
 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:247 [inline]
 bch2_btree_iter_peek_slot+0x10b7/0x3950 fs/bcachefs/btree_iter.c:2629
 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:575 [inline]
 bch2_bkey_get_iter fs/bcachefs/btree_iter.h:589 [inline]
 __bch2_inode_peek+0x243/0x890 fs/bcachefs/inode.c:346
 bch2_inode_peek fs/bcachefs/inode.h:127 [inline]
 bch2_create_trans+0x39b/0x2030 fs/bcachefs/fs-common.c:45
 __bch2_create+0x97e/0x1700 fs/bcachefs/fs.c:522
 bch2_mknod fs/bcachefs/fs.c:673 [inline]
 bch2_create+0xc0/0x1d0 fs/bcachefs/fs.c:687
 lookup_open fs/namei.c:3649 [inline]
 open_last_lookups fs/namei.c:3748 [inline]
 path_openat+0x2e9e/0x6200 fs/namei.c:3984
 do_filp_open+0x268/0x600 fs/namei.c:4014
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_openat fs/open.c:1433 [inline]
 __se_sys_openat fs/open.c:1428 [inline]
 __x64_sys_openat+0x2a1/0x310 fs/open.c:1428
 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258
 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

Uninit was created at:
 ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4253
 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4270
 __do_kmalloc_node mm/slub.c:4286 [inline]
 __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4304
 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:650
 btree_bounce_alloc fs/bcachefs/btree_io.c:124 [inline]
 btree_node_sort+0x78a/0x1d30 fs/bcachefs/btree_io.c:323
 bch2_btree_post_write_cleanup+0x1b0/0xf20 fs/bcachefs/btree_io.c:2248
 bch2_btree_node_write+0x21c/0x2e0 fs/bcachefs/btree_io.c:2289
 btree_node_write_if_need fs/bcachefs/btree_io.h:151 [inline]
 __btree_node_flush+0x606/0x680 fs/bcachefs/btree_trans_commit.c:252
 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:261
 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:565
 __bch2_journal_reclaim+0xda8/0x1670 fs/bcachefs/journal_reclaim.c:698
 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:740
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

CPU: 0 UID: 0 PID: 5957 Comm: syz.2.3 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================