It seems like this bug https://bugzilla.novell.com/show_bug.cgi?id=379602in mono 3.2.5.
I was fixed in mono 2.4 but it seems to have reappeared since then because my process is using CPU at doing nothing and I noticed it gets worse if I add threads (even if they do nothing). When I use strace on a process running with mono 3.2.5, I get a similar output : futex(0x9ce6520, FUTEX_WAIT, 81061, {0, 999009600}) = -1 ETIMEDOUT (Connection timed out) time(NULL) = 1391196463 futex(0x9ce6504, FUTEX_WAKE, 1) = 0 gettimeofday({1391196463, 363628}, NULL) = 0 gettimeofday({1391196463, 363707}, NULL) = 0 time(NULL) = 1391196463 gettimeofday({1391196463, 363848}, NULL) = 0 time(NULL) = 1391196463 time(NULL) = 1391196463 clock_gettime(CLOCK_REALTIME, {1391196463, 364038031}) = 0 futex(0x9ce6520, FUTEX_WAIT, 81063, {0, 998961969}) = -1 ETIMEDOUT (Connection timed out) time(NULL) = 1391196464 futex(0x9ce6504, FUTEX_WAKE, 1) = 0 gettimeofday({1391196464, 363500}, NULL) = 0 gettimeofday({1391196464, 363597}, NULL) = 0 time(NULL) = 1391196464 gettimeofday({1391196464, 363713}, NULL) = 0 time(NULL) = 1391196464 time(NULL) = 1391196464 clock_gettime(CLOCK_REALTIME, {1391196464, 363903927}) = 0 The same process doesn't use any cpu time when running on .NET. Any idea what could cause this problem. Has anyone else noticed this problem? Jonathan
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