device-mapper: verity: 251:0: metadata block 18398 is corrupted

[Pintu Agarwal]

Hi,
In one of our NAND products (arm64) we are having Kernel 5.15 along
with squashfs + ubiblock + dm-verity on rootfs along with ramdisk.

Recently we have enabled "NAND Page Cache" in our nand driver to
improve nand read performance.
But after enabling this feature, the dm-verity detects metadata
corruption during boot-up and the device is crashing.
If we disable dm-verity (from ramdisk) then we don't see this problem
and the device boots fine.

Are there any dm-verity specific changes (in higher Kernel version)
that we are missing here ?

This is the failure log.
What does the below metadata corruption indicate ?
Does this mean, the root_hash is corrupted ?

{{{
[    7.731295][  T136] device-mapper: verity: 251:0: metadata block
18398 is corrupted
[    7.742723][  T136] ------------[ cut here ]------------
[    7.748206][  T136] workqueue: WQ_MEM_RECLAIM kverityd:verity_work
is flushing !WQ_MEM_RECLAIM k_sm_usb:0x0
[    7.754840][  T136] WARNING: CPU: 3 PID: 136 at
kernel/workqueue.c:2660 check_flush_dependency+0x12c/0x134
[...]
[    7.809215][  T136] pc : check_flush_dependency+0x12c/0x134
[    7.814933][  T136] lr : check_flush_dependency+0x12c/0x134
[...]
[    7.905120][  T136] Call trace:
[    7.908345][  T136]  check_flush_dependency+0x12c/0x134
[    7.913710][  T136]  flush_workqueue+0x1cc/0x4dc
[    7.918452][  T136]  dwc3_msm_shutdown+0x48/0x58
[    7.923195][  T136]  platform_shutdown+0x24/0x30
[    7.927937][  T136]  device_shutdown+0x170/0x220
[    7.932680][  T136]  kernel_restart+0x40/0xfc
[    7.937152][  T136]  verity_handle_err+0x11c/0x1b0
[    7.942071][  T136]  verity_hash_for_block+0x260/0x2d8
[    7.947343][  T136]  verity_verify_io+0xe8/0x568
[    7.952085][  T136]  verity_work+0x24/0x74
[    7.956297][  T136]  process_one_work+0x1a8/0x3a0
[    7.961133][  T136]  worker_thread+0x22c/0x490
[    7.965700][  T136]  kthread+0x154/0x218
[    7.969725][  T136]  ret_from_fork+0x10/0x20
[    7.974116][  T136] ---[ end trace 166e4069e91d0a01 ]---
}}}

Thanks,
Pintu