BTRFS info (device loop3): using free space tree
BTRFS info (device loop3): enabling ssd optimizations
BTRFS info (device loop3): auto enabling async discard
=====================================================
BUG: KMSAN: uninit-value in leaf_space_used fs/btrfs/ctree.c:3014 [inline]
BUG: KMSAN: uninit-value in btrfs_leaf_free_space+0x693/0x790 fs/btrfs/ctree.c:3029
 leaf_space_used fs/btrfs/ctree.c:3014 [inline]
 btrfs_leaf_free_space+0x693/0x790 fs/btrfs/ctree.c:3029
 search_leaf fs/btrfs/ctree.c:1900 [inline]
 btrfs_search_slot+0x3376/0x4710 fs/btrfs/ctree.c:2177
 btrfs_insert_empty_items+0xb3/0x220 fs/btrfs/ctree.c:4206
 btrfs_insert_empty_item fs/btrfs/ctree.h:631 [inline]
 insert_balance_item+0x354/0x1440 fs/btrfs/volumes.c:3452
 btrfs_balance+0x10df/0x1eb0 fs/btrfs/volumes.c:4357
 btrfs_ioctl_balance+0x85e/0xe00 fs/btrfs/ioctl.c:3591
 btrfs_ioctl+0xe75/0x1290 fs/btrfs/ioctl.c:4622
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4701
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x7dd/0x1000 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910
 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
 btrfs_insert_empty_items+0xb3/0x220 fs/btrfs/ctree.c:4206
 btrfs_insert_empty_item fs/btrfs/ctree.h:631 [inline]
 insert_balance_item+0x354/0x1440 fs/btrfs/volumes.c:3452
 btrfs_balance+0x10df/0x1eb0 fs/btrfs/volumes.c:4357
 btrfs_ioctl_balance+0x85e/0xe00 fs/btrfs/ioctl.c:3591
 btrfs_ioctl+0xe75/0x1290 fs/btrfs/ioctl.c:4622
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4701
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x7dd/0x1000 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910
 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: 7548 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
=====================================================