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[bug #58979] Recursive make using jobserver hangs at completion

From: David Hefner
Subject: [bug #58979] Recursive make using jobserver hangs at completion
Date: Wed, 19 Aug 2020 20:14:33 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Follow-up Comment #5, bug #58979 (project make):

I will work on gathering the make files.  It will take time that I don't have
right now.

I do have some more data about this problem.  I run this build system on many
different machines.  The machines have varying numbers of cores, processor
speeds, etc.

On some machines, make failures are rare or non-existent.  The machine that
consistently fails is somewhat unique, in that it has 6 cores.  It may be
total coincidence.  But I wonder if there's a race condition somewhere.  Some
race conditions are sensitive to processor timing, system load, etc.

I also tried running the build with no -j argument.  It takes a very long
time, but it succeeds on the machine that consistently fails with -j6.  As I
mentioned, we were not seeing a problem running 3.81.

Dave Hefner

processor       : 5
vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2609 v3 @ 1.90GHz
stepping        : 2
microcode       : 43
cpu MHz         : 1200.000
cache size      : 15360 KB
physical id     : 0
siblings        : 6
core id         : 5
cpu cores       : 6
apicid          : 10
initial apicid  : 10
fpu             : yes
fpu_exception   : yes
cpuid level     : 15
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2
ssse3 fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm arat epb xsaveopt pln
pts dts tpr_shadow vnmi flexpriority ept vpid fsgsbase bmi1 avx2 smep bmi2
erms invpcid
bogomips        : 3795.59
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:


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