I've been bitten by this bug too, and here is what I've gathered: tst-eintr1 spawns threads continuously, without joining them, until it receives a SIGALRM. This is supposed to occur take 3 seconds, which, on my computer, makes roughly 5k threads unjoined threads, which is already a large number. Now, when building from the source package, this test doesn't run for 3 seconds, but for 150 seconds due to TIMEOUTFACTOR=50... This changes the large number of 5k threads to something really huge: about 250k (potentially finished, but never joined) threads. Although I don't really know how finished-but-unjoined threads are handled, such a large number is bound to hit some limit.
Regards, Thibaut Girka.
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