On Thursday, 29 June 2023 11:54:29 EDT, David Howells wrote:
Matt Whitlock, Matthew Wilcox and Dave Chinner are of the opinion that data in the pipe must not be seen to change and that if it does, this is a bug. Apart from in one specific instance (vmsplice() with SPLICE_F_GIFT), the manual pages agree with them. I'm more inclined to adjust the documentation since the behaviour we have has been that way since 2005, I think.
Anecdotally, my use case had been working fine for years until I upgraded from 5.15.x to 6.1.x in February of this year. That's when my backups started being corrupted. I only noticed when I was trying to restore a lost file from backup earlier this week.