Bit the bullet, bisected v5.5..v5.6 and found this: 0ddad21d3e99c743a3aa473121dc5561679e26bb is the first bad commit commit 0ddad21d3e99c743a3aa473121dc5561679e26bb Author: Linus Torvalds <torva...@linux-foundation.org> Date: Mon Dec 9 09:48:27 2019 -0800
pipe: use exclusive waits when reading or writing [...] [ Note! This kernel improvement seems to be very good at triggering a race condition in the make jobserver (in GNU make 4.2.1) for me. It's a long known bug that was fixed back in June 2017 by GNU make commit b552b0525198 ("[SV 51159] Use a non-blocking read with pselect to avoid hangs."). But there wasn't a new release of GNU make until 4.3 on Jan 19 2020, so a number of distributions may still have the buggy version. Some have backported the fix to their 4.2.1 release, though, and even without the fix it's quite timing-dependent whether the bug actually is hit. ] [...] After updating "make" to 4.3 all is well. Feynman was right again. ;) -- The truth always turns out to be simpler than you thought. Richard Feynman
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