On Wed, Nov 10, 2021 at 3:40 AM Noah Misch <noah@leadboat.com> wrote:
> $ diff -U0 <(cut -b47- disasm/70bef49/equalTupleDescs) <(cut -b47- disasm/166f943/equalTupleDescs)
> --- /dev/fd/63 2021-11-09 06:11:20.927444437 -0800
> +++ /dev/fd/62 2021-11-09 06:11:20.926444428 -0800
> @@ -100 +100 @@
> - br.call.sptk.many rp=0x40000000003cdc20
> + br.call.sptk.many rp=0x40000000003cde20
> @@ -658 +658 @@
> - br.call.sptk.many rp=0x40000000003cdc20
> + br.call.sptk.many rp=0x40000000003cde20
> @@ -817 +817 @@
> - br.call.sptk.many rp=0x3fffffffff3fdc30
> + br.call.sptk.many rp=0x4000000000400c30
> @@ -949 +949 @@
> - br.call.sptk.many rp=0x40000000003cdc20
> + br.call.sptk.many rp=0x40000000003cde20
> @@ -970 +970 @@
> - br.call.sptk.many rp=0x40000000003cdc20
> + br.call.sptk.many rp=0x40000000003cde20
>
> Since "git diff 70bef49 166f943" contains nothing that correlates with such a
> change, I'm concluding that this is a bug in gharial's toolchain.
Excellent detective work.
> It looks like gharial's automatic buildfarm runs have been paused for nine
> days. Feel free to unpause it. Also, I recommend using the buildfarm client
> setnotes.pl to add a note like 'Rare signal 11 from toolchain bug'. Months or
> years pass between these events. Here are all gharial "signal 11" failures,
> likely some of which have other causes:
Yeah I spent time investigating some of these at the time and I know
others did too.
IMHO we should hunt down dead toolchains and gently see if we can get
them updated. There is no point in testing PostgreSQL on every
commit on a compiler someone built from a tarball many years ago and
never updated with bug fixes.