ext4 filesystem remounted read-only during larger transfers

[m.eik michalke]

i'm reporting this here because the problem was solved when running a 5.15 or 5.19 kernel, but reappeared when trying 6.2 again. i therefore assume it might indeed point to a bug in the 6.2 kernel.

i often do larger file transfers on a desktop machine currently running kubuntu 22.04.3 LTS with kubuntu backports and HWE kernel (low latency for audio recordings). a single recording session can be 20 GB, i'm rsyncing it from one partition to another on the same system. since a few weeks, i'm running into file system issues during these transfers:

[15104.146766] Aborting journal on device md6-8.
[15104.166906] EXT4-fs error (device md6): ext4_journal_check_start:83: comm rsync: Detected aborted journal
[15104.695117] journal_release_journal_head: freeing b_frozen_data

the device is then re-mounted read-only an rsync aborts. this happens out of nowhere after a few gigabytes of data and is not limited to a specific RAID device. i ran a complete long test with smartmontools on both disks, it didn't find any issues. after such an incident, e2fsck fixes the number of free inodes and blocks and it can be used again, until the next large file transfer.

i ran memcheck86 and indeed found some tests were failing with one of my RAM modules, but removing the module didn't solve the issue. what actually solved it was using an older kernel version. i first tried 5.15 and am now using 5.19, i don't get read-only filesystems on large transfers with any of both.

some additional info that might be relevant:

- the filesystems are all on RAID 1 devices, ext4 and use fscrypt
- the hardware on the affected machine is pretty dated (ASUS Z97-K mainboard, intel i5-4460 CPU 3.20 GHz, 8GB DDR3 RAM, NVIDIA GeForce GT 610), except for the hard drives