BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop3 scanned by syz-executor.3 (10286)
BTRFS info (device loop3): using blake2b (blake2b-256-generic) checksum algorithm
BTRFS info (device loop3): turning on sync discard
BTRFS info (device loop3): using free space tree
BTRFS info (device loop3): enabling ssd optimizations
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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]
 btrfs_search_slot+0x1caa/0x4710 fs/btrfs/ctree.c:2184
 btrfs_truncate_inode_items+0x5fa/0x46a0 fs/btrfs/inode-item.c:516
 btrfs_truncate fs/btrfs/inode.c:8717 [inline]
 btrfs_setsize fs/btrfs/inode.c:5264 [inline]
 btrfs_setattr+0x187a/0x2c50 fs/btrfs/inode.c:5299
 notify_change+0x21ef/0x22f0 fs/attr.c:482
 do_truncate+0x240/0x2d0 fs/open.c:65
 vfs_truncate+0x5df/0x680 fs/open.c:111
 do_sys_truncate+0x114/0x260 fs/open.c:134
 __do_compat_sys_truncate fs/open.c:152 [inline]
 __se_compat_sys_truncate fs/open.c:150 [inline]
 __ia32_compat_sys_truncate+0x6c/0xa0 fs/open.c:150
 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_truncate_inode_items+0x5fa/0x46a0 fs/btrfs/inode-item.c:516
 btrfs_truncate fs/btrfs/inode.c:8717 [inline]
 btrfs_setsize fs/btrfs/inode.c:5264 [inline]
 btrfs_setattr+0x187a/0x2c50 fs/btrfs/inode.c:5299
 notify_change+0x21ef/0x22f0 fs/attr.c:482
 do_truncate+0x240/0x2d0 fs/open.c:65
 vfs_truncate+0x5df/0x680 fs/open.c:111
 do_sys_truncate+0x114/0x260 fs/open.c:134
 __do_compat_sys_truncate fs/open.c:152 [inline]
 __se_compat_sys_truncate fs/open.c:150 [inline]
 __ia32_compat_sys_truncate+0x6c/0xa0 fs/open.c:150
 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: 10286 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-81151-g224e1375d540 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================