=====================================================
BUG: KMSAN: uninit-value in pagecache_write+0x655/0x720 fs/ext4/verity.c:91
 pagecache_write+0x655/0x720 fs/ext4/verity.c:91
 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389
 build_merkle_tree_level+0x972/0x1250 fs/verity/enable.c:121
 build_merkle_tree fs/verity/enable.c:182 [inline]
 enable_verity+0xede/0x1920 fs/verity/enable.c:268
 fsverity_ioctl_enable+0x895/0xab0 fs/verity/enable.c:392
 __ext4_ioctl fs/ext4/ioctl.c:1572 [inline]
 ext4_ioctl+0x26dd/0x8c50 fs/ext4/ioctl.c:1606
 ext4_compat_ioctl+0x702/0x800 fs/ext4/ioctl.c:1682
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x781/0xfa0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x8f/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+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Local variable fsdata created at:
 pagecache_write+0x21c/0x720 fs/ext4/verity.c:85
 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389

CPU: 1 PID: 11611 Comm: syz-executor.4 Tainted: G        W          6.0.0-rc5-syzkaller-48543-g968c2729e576 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
=====================================================