Bug#722348: (no subject)
Looks like the usual lock b0rkage where something tries to unlock an
already unlocked lock, to me. In that case, it is a simple software
bug.
However, if (and only if) it only happens under x32, but works fine
under amd64 on the same box, it could be a bug somewhere else (kernel,
libpthreads, processor).
FWIW, ensure you have intel-microcode 3.20160714.* or later installed on
any box with TSX support. You are at (low?) risk of unpredictable
behavior otherwise, but it wouldn't cause a trap on XEND anyway, so it
is NOT what you are observing in this bug report.
--
Henrique Holschuh
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