BTRFS info (device loop4): enabling ssd optimizations
BTRFS info (device loop4): using spread ssd allocation scheme
BTRFS info (device loop4): using free space tree
BTRFS info (device loop4): auto enabling async discard
=====================================================
BUG: KMSAN: uninit-value in leaf_space_used fs/btrfs/ctree.c:3010 [inline]
BUG: KMSAN: uninit-value in btrfs_leaf_free_space+0x693/0x790 fs/btrfs/ctree.c:3025
 leaf_space_used fs/btrfs/ctree.c:3010 [inline]
 btrfs_leaf_free_space+0x693/0x790 fs/btrfs/ctree.c:3025
 search_leaf fs/btrfs/ctree.c:1903 [inline]
 btrfs_search_slot+0x30c0/0x4380 fs/btrfs/ctree.c:2180
 btrfs_insert_empty_items+0xb3/0x220 fs/btrfs/ctree.c:4197
 btrfs_insert_empty_item fs/btrfs/ctree.h:633 [inline]
 insert_balance_item+0x30b/0x1390 fs/btrfs/volumes.c:3468
 btrfs_balance+0x10df/0x1ea0 fs/btrfs/volumes.c:4373
 btrfs_ioctl_balance+0x85e/0xe00 fs/btrfs/ioctl.c:3599
 btrfs_ioctl+0xe75/0x1290 fs/btrfs/ioctl.c:4632
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4711
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x78f/0xfd0 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+0x9a4/0xe00 mm/page_alloc.c:4791
 alloc_pages+0xd01/0x1040
 folio_alloc+0x42/0x120 mm/mempolicy.c:2289
 filemap_alloc_folio+0xa5/0x430 mm/filemap.c:976
 __filemap_get_folio+0x908/0x13a0 mm/filemap.c:1971
 pagecache_get_page+0x4e/0x200 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:635 [inline]
 alloc_extent_buffer+0x725/0x3130 fs/btrfs/extent_io.c:3888
 btrfs_find_create_tree_block+0x46/0x60 fs/btrfs/disk-io.c:836
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4776 [inline]
 btrfs_alloc_tree_block+0x344/0x1d20 fs/btrfs/extent-tree.c:4895
 __btrfs_cow_block+0x562/0x1d50 fs/btrfs/ctree.c:541
 btrfs_cow_block+0x7cc/0xa00 fs/btrfs/ctree.c:696
 btrfs_search_slot+0x169d/0x4380 fs/btrfs/ctree.c:2144
 btrfs_insert_empty_items+0xb3/0x220 fs/btrfs/ctree.c:4197
 btrfs_insert_empty_item fs/btrfs/ctree.h:633 [inline]
 insert_balance_item+0x30b/0x1390 fs/btrfs/volumes.c:3468
 btrfs_balance+0x10df/0x1ea0 fs/btrfs/volumes.c:4373
 btrfs_ioctl_balance+0x85e/0xe00 fs/btrfs/ioctl.c:3599
 btrfs_ioctl+0xe75/0x1290 fs/btrfs/ioctl.c:4632
 btrfs_compat_ioctl+0x65/0x70 fs/btrfs/ioctl.c:4711
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x78f/0xfd0 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: 0 PID: 5245 Comm: syz-executor.4 Not tainted 6.4.0-rc7-syzkaller-ge6bc8833d80f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
=====================================================