BTRFS info (device loop3): clearing free space tree
BTRFS info (device loop3): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop3): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
=====================================================
BUG: KMSAN: uninit-value in btrfs_comp_cpu_keys fs/btrfs/ctree.c:753 [inline]
BUG: KMSAN: uninit-value in comp_keys fs/btrfs/ctree.c:729 [inline]
BUG: KMSAN: uninit-value in generic_bin_search+0x784/0xb80 fs/btrfs/ctree.c:913
 btrfs_comp_cpu_keys fs/btrfs/ctree.c:753 [inline]
 comp_keys fs/btrfs/ctree.c:729 [inline]
 generic_bin_search+0x784/0xb80 fs/btrfs/ctree.c:913
 search_for_key_slot fs/btrfs/ctree.c:1872 [inline]
 search_leaf fs/btrfs/ctree.c:1964 [inline]
 btrfs_search_slot+0x3a51/0x4710 fs/btrfs/ctree.c:2177
 clear_free_space_tree fs/btrfs/free-space-tree.c:1233 [inline]
 btrfs_clear_free_space_tree+0x244/0xec0 fs/btrfs/free-space-tree.c:1274
 btrfs_start_pre_rw_mount+0x344/0xb60 fs/btrfs/disk-io.c:3305
 open_ctree+0x4487/0x5400 fs/btrfs/disk-io.c:3897
 btrfs_fill_super+0x21a/0x550 fs/btrfs/super.c:1151
 btrfs_mount_root+0x10cf/0x1310 fs/btrfs/super.c:1520
 legacy_get_tree+0x110/0x290 fs/fs_context.c:610
 vfs_get_tree+0xa5/0x500 fs/super.c:1489
 fc_mount fs/namespace.c:1149 [inline]
 vfs_kern_mount+0x2a1/0x3b0 fs/namespace.c:1179
 btrfs_mount+0x6c8/0x1910 fs/btrfs/super.c:1580
 legacy_get_tree+0x110/0x290 fs/fs_context.c:610
 vfs_get_tree+0xa5/0x500 fs/super.c:1489
 do_new_mount+0x69a/0x1580 fs/namespace.c:3145
 path_mount+0x725/0x1ec0 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x734/0x840 fs/namespace.c:3674
 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:3674
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9f6/0xe90 mm/page_alloc.c:5572
 alloc_pages+0xab0/0xd80 mm/mempolicy.c:2287
 folio_alloc+0x42/0x120 mm/mempolicy.c:2297
 filemap_alloc_folio+0xb2/0x460 mm/filemap.c:972
 __filemap_get_folio+0xe4b/0x1920 mm/filemap.c:1966
 pagecache_get_page+0x4f/0x290 mm/folio-compat.c:98
 find_or_create_page include/linux/pagemap.h:612 [inline]
 alloc_extent_buffer+0x733/0x3190 fs/btrfs/extent_io.c:4500
 btrfs_find_create_tree_block+0x46/0x60 fs/btrfs/disk-io.c:1002
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4873 [inline]
 btrfs_alloc_tree_block+0x371/0x1f70 fs/btrfs/extent-tree.c:4992
 __btrfs_cow_block+0x578/0x1f20 fs/btrfs/ctree.c:541
 btrfs_cow_block+0x7cc/0xa00 fs/btrfs/ctree.c:696
 btrfs_search_slot+0x189f/0x4710 fs/btrfs/ctree.c:2141
 clear_free_space_tree fs/btrfs/free-space-tree.c:1233 [inline]
 btrfs_clear_free_space_tree+0x244/0xec0 fs/btrfs/free-space-tree.c:1274
 btrfs_start_pre_rw_mount+0x344/0xb60 fs/btrfs/disk-io.c:3305
 open_ctree+0x4487/0x5400 fs/btrfs/disk-io.c:3897
 btrfs_fill_super+0x21a/0x550 fs/btrfs/super.c:1151
 btrfs_mount_root+0x10cf/0x1310 fs/btrfs/super.c:1520
 legacy_get_tree+0x110/0x290 fs/fs_context.c:610
 vfs_get_tree+0xa5/0x500 fs/super.c:1489
 fc_mount fs/namespace.c:1149 [inline]
 vfs_kern_mount+0x2a1/0x3b0 fs/namespace.c:1179
 btrfs_mount+0x6c8/0x1910 fs/btrfs/super.c:1580
 legacy_get_tree+0x110/0x290 fs/fs_context.c:610
 vfs_get_tree+0xa5/0x500 fs/super.c:1489
 do_new_mount+0x69a/0x1580 fs/namespace.c:3145
 path_mount+0x725/0x1ec0 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x734/0x840 fs/namespace.c:3674
 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:3674
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 7596 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-81152-g97e36f4aa06f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================