=====================================================
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 btrfs_bin_search+0x74c/0xb30 fs/btrfs/ctree.c:919
 btrfs_comp_cpu_keys fs/btrfs/ctree.c:753 [inline]
 comp_keys fs/btrfs/ctree.c:729 [inline]
 btrfs_bin_search+0x74c/0xb30 fs/btrfs/ctree.c:919
 search_for_key_slot fs/btrfs/ctree.c:1875 [inline]
 search_leaf fs/btrfs/ctree.c:1967 [inline]
 btrfs_search_slot+0x32cb/0x4380 fs/btrfs/ctree.c:2180
 update_dev_stat_item fs/btrfs/volumes.c:7493 [inline]
 btrfs_run_dev_stats+0x43a/0x15c0 fs/btrfs/volumes.c:7570
 commit_cowonly_roots+0x329/0x10e0 fs/btrfs/transaction.c:1282
 btrfs_commit_transaction+0x213d/0x64a0 fs/btrfs/transaction.c:2405
 btrfs_commit_super+0x13c/0x180 fs/btrfs/disk-io.c:4441
 close_ctree+0x3c8/0x1390 fs/btrfs/disk-io.c:4595
 btrfs_put_super+0x3c/0x50 fs/btrfs/super.c:82
 generic_shutdown_super+0x19a/0x5c0 fs/super.c:500
 kill_anon_super+0x3d/0x70 fs/super.c:1107
 btrfs_kill_super+0x3d/0x60 fs/btrfs/super.c:2144
 deactivate_locked_super+0xc0/0x150 fs/super.c:331
 deactivate_super+0x14b/0x160 fs/super.c:362
 cleanup_mnt+0x6c4/0x730 fs/namespace.c:1177
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1184
 task_work_run+0x263/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x29d/0x320 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x163/0x220 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x2a/0x140 kernel/entry/common.c:297
 __do_fast_syscall_32+0xb1/0x100 arch/x86/entry/common.c:181
 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
 update_dev_stat_item fs/btrfs/volumes.c:7493 [inline]
 btrfs_run_dev_stats+0x43a/0x15c0 fs/btrfs/volumes.c:7570
 commit_cowonly_roots+0x329/0x10e0 fs/btrfs/transaction.c:1282
 btrfs_commit_transaction+0x213d/0x64a0 fs/btrfs/transaction.c:2405
 btrfs_commit_super+0x13c/0x180 fs/btrfs/disk-io.c:4441
 close_ctree+0x3c8/0x1390 fs/btrfs/disk-io.c:4595
 btrfs_put_super+0x3c/0x50 fs/btrfs/super.c:82
 generic_shutdown_super+0x19a/0x5c0 fs/super.c:500
 kill_anon_super+0x3d/0x70 fs/super.c:1107
 btrfs_kill_super+0x3d/0x60 fs/btrfs/super.c:2144
 deactivate_locked_super+0xc0/0x150 fs/super.c:331
 deactivate_super+0x14b/0x160 fs/super.c:362
 cleanup_mnt+0x6c4/0x730 fs/namespace.c:1177
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1184
 task_work_run+0x263/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x29d/0x320 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x163/0x220 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x2a/0x140 kernel/entry/common.c:297
 __do_fast_syscall_32+0xb1/0x100 arch/x86/entry/common.c:181
 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: 4992 Comm: syz-executor.3 Not tainted 6.4.0-syzkaller-g257152fe29be #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
=====================================================