On Sat, 24 Aug 2024 18:50:40 -0700, Forest wrote: >I was unable to determine whether 6.11.0-rc4 fixes it, due to another cifs bug >in that version (which I hope to report soon). That bug is now reported: https://lore.kernel.org/linux-cifs/37fncjpgsq45becdf2pdju0idf3hj3dtmb@xxxxxxxxx/T/#u A pair of patches considered in that bug's discussion allowed me to test this regression on 3e9bff3bbe13, which is one commit ahead of v6.11-rc5. The mkvmerge output corruption is still present.