syzbot

bcachefs (loop1): going read-write
bcachefs (loop1): done starting filesystem
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BUG: KMSAN: uninit-value in xattr_cmp_key+0x2f3/0x390 fs/bcachefs/xattr.c:49
 xattr_cmp_key+0x2f3/0x390 fs/bcachefs/xattr.c:49
 bch2_hash_lookup_in_snapshot fs/bcachefs/str_hash.h:178 [inline]
 bch2_hash_lookup fs/bcachefs/str_hash.h:202 [inline]
 bch2_acl_chmod+0xaa2/0x1590 fs/bcachefs/acl.c:423
 bch2_setattr_nonsize+0x12ef/0x1830 fs/bcachefs/fs.c:797
 bch2_setattr+0x264/0x2f0 fs/bcachefs/fs.c:886
 notify_change+0x1a07/0x1af0 fs/attr.c:497
 chmod_common+0x3b8/0x630 fs/open.c:650
 do_fchmodat fs/open.c:698 [inline]
 __do_sys_fchmodat fs/open.c:717 [inline]
 __se_sys_fchmodat fs/open.c:714 [inline]
 __x64_sys_fchmodat+0x160/0x2b0 fs/open.c:714
 x64_sys_call+0x1d6f/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:269
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __kmalloc_large_node+0x231/0x370 mm/slub.c:3994
 __do_kmalloc_node mm/slub.c:4027 [inline]
 __kmalloc_node+0xb10/0x10c0 mm/slub.c:4046
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0xc0/0x2d0 mm/util.c:634
 kvmalloc include/linux/slab.h:766 [inline]
 btree_bounce_alloc fs/bcachefs/btree_io.c:118 [inline]
 bch2_btree_node_read_done+0x4e68/0x75e0 fs/bcachefs/btree_io.c:1185
 btree_node_read_work+0x8a5/0x1eb0 fs/bcachefs/btree_io.c:1324
 bch2_btree_node_read+0x3d42/0x4b50
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline]
 bch2_btree_root_read+0xa6c/0x13d0 fs/bcachefs/btree_io.c:1772
 read_btree_roots+0x454/0xee0 fs/bcachefs/recovery.c:457
 bch2_fs_recovery+0x7b6a/0x93e0 fs/bcachefs/recovery.c:785
 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043
 bch2_fs_open+0x152a/0x15f0 fs/bcachefs/super.c:2105
 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1906
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 PID: 7935 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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