BTRFS info (device loop4): using blake2b (blake2b-256-generic) checksum algorithm
BTRFS info (device loop4): turning on sync discard
BTRFS info (device loop4): using free space tree
BTRFS info (device loop4): enabling ssd optimizations
=====================================================
BUG: KMSAN: uninit-value in htree_insert fs/btrfs/delayed-ref.c:281 [inline]
BUG: KMSAN: uninit-value in add_delayed_ref_head+0x362/0xca0 fs/btrfs/delayed-ref.c:785
 htree_insert fs/btrfs/delayed-ref.c:281 [inline]
 add_delayed_ref_head+0x362/0xca0 fs/btrfs/delayed-ref.c:785
 btrfs_add_delayed_tree_ref+0x1028/0x1c40 fs/btrfs/delayed-ref.c:935
 btrfs_inc_extent_ref fs/btrfs/extent-tree.c:1395 [inline]
 __btrfs_mod_ref+0xfc5/0x1530 fs/btrfs/extent-tree.c:2435
 btrfs_inc_ref+0x4b/0x60 fs/btrfs/extent-tree.c:2450
 btrfs_copy_root+0xa74/0xf70
 create_pending_snapshot+0x12c0/0x3af0 fs/btrfs/transaction.c:1762
 create_pending_snapshots+0x258/0x3b0 fs/btrfs/transaction.c:1888
 btrfs_commit_transaction+0x1ee9/0x64a0 fs/btrfs/transaction.c:2358
 create_snapshot+0x92d/0xe80 fs/btrfs/ioctl.c:846
 btrfs_mksubvol+0xa27/0xbb0 fs/btrfs/ioctl.c:996
 btrfs_mksnapshot+0x11f/0x180 fs/btrfs/ioctl.c:1042
 __btrfs_ioctl_snap_create+0x53e/0x860 fs/btrfs/ioctl.c:1295
 btrfs_ioctl_snap_create+0x214/0x2d0 fs/btrfs/ioctl.c:1322
 btrfs_ioctl+0x4aa/0x1290
 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 stored to memory at:
 init_delayed_ref_head fs/btrfs/delayed-ref.c:732 [inline]
 btrfs_add_delayed_tree_ref+0x1579/0x1c40 fs/btrfs/delayed-ref.c:923
 btrfs_inc_extent_ref fs/btrfs/extent-tree.c:1395 [inline]
 __btrfs_mod_ref+0xfc5/0x1530 fs/btrfs/extent-tree.c:2435
 btrfs_inc_ref+0x4b/0x60 fs/btrfs/extent-tree.c:2450
 btrfs_copy_root+0xa74/0xf70
 create_pending_snapshot+0x12c0/0x3af0 fs/btrfs/transaction.c:1762
 create_pending_snapshots+0x258/0x3b0 fs/btrfs/transaction.c:1888
 btrfs_commit_transaction+0x1ee9/0x64a0 fs/btrfs/transaction.c:2358
 create_snapshot+0x92d/0xe80 fs/btrfs/ioctl.c:846
 btrfs_mksubvol+0xa27/0xbb0 fs/btrfs/ioctl.c:996
 btrfs_mksnapshot+0x11f/0x180 fs/btrfs/ioctl.c:1042
 __btrfs_ioctl_snap_create+0x53e/0x860 fs/btrfs/ioctl.c:1295
 btrfs_ioctl_snap_create+0x214/0x2d0 fs/btrfs/ioctl.c:1322
 btrfs_ioctl+0x4aa/0x1290
 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 stored to memory at:
 btrfs_init_generic_ref fs/btrfs/delayed-ref.h:281 [inline]
 __btrfs_mod_ref+0xd4a/0x1530 fs/btrfs/extent-tree.c:2430
 btrfs_inc_ref+0x4b/0x60 fs/btrfs/extent-tree.c:2450
 btrfs_copy_root+0xa74/0xf70
 create_pending_snapshot+0x12c0/0x3af0 fs/btrfs/transaction.c:1762
 create_pending_snapshots+0x258/0x3b0 fs/btrfs/transaction.c:1888
 btrfs_commit_transaction+0x1ee9/0x64a0 fs/btrfs/transaction.c:2358
 create_snapshot+0x92d/0xe80 fs/btrfs/ioctl.c:846
 btrfs_mksubvol+0xa27/0xbb0 fs/btrfs/ioctl.c:996
 btrfs_mksnapshot+0x11f/0x180 fs/btrfs/ioctl.c:1042
 __btrfs_ioctl_snap_create+0x53e/0x860 fs/btrfs/ioctl.c:1295
 btrfs_ioctl_snap_create+0x214/0x2d0 fs/btrfs/ioctl.c:1322
 btrfs_ioctl+0x4aa/0x1290
 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:1965
 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:835
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4776 [inline]
 btrfs_alloc_tree_block+0x344/0x1d20 fs/btrfs/extent-tree.c:4895
 btrfs_copy_root+0x40b/0xf70 fs/btrfs/ctree.c:327
 create_pending_snapshot+0x12c0/0x3af0 fs/btrfs/transaction.c:1762
 create_pending_snapshots+0x258/0x3b0 fs/btrfs/transaction.c:1888
 btrfs_commit_transaction+0x1ee9/0x64a0 fs/btrfs/transaction.c:2358
 create_snapshot+0x92d/0xe80 fs/btrfs/ioctl.c:846
 btrfs_mksubvol+0xa27/0xbb0 fs/btrfs/ioctl.c:996
 btrfs_mksnapshot+0x11f/0x180 fs/btrfs/ioctl.c:1042
 __btrfs_ioctl_snap_create+0x53e/0x860 fs/btrfs/ioctl.c:1295
 btrfs_ioctl_snap_create+0x214/0x2d0 fs/btrfs/ioctl.c:1322
 btrfs_ioctl+0x4aa/0x1290
 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: 1 PID: 5562 Comm: syz-executor.4 Not tainted 6.4.0-rc6-syzkaller-g7cccf3be6dcb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
=====================================================