[llvm-dev] [lit] check-all hanging (original) (raw)

Chandler Carruth via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 2 13:41:30 PST 2019

What you're seeing is just the fact that lit is waiting on subprocesses (select is waiting on the pipes i suspect).

Anyways, you'll need to dig into what it is waiting on, and what that process is doing that is stuck to make progress.

I've not seen anything like this, but I basically never run check-all these days because LLDB and sanitizer tests are too flaky. =[ I've not been able to interest anyone in fixing this either sadly.

On Wed, Jan 2, 2019 at 10:09 AM David Greene via llvm-dev < llvm-dev at lists.llvm.org> wrote:

Hi,

From time to time, I see check-all hang during running of lit tests. The hang always happens at the > 90% completion stage and I'm pretty sure all tests have been run and check-all is just waiting for lit/python to exit. I see a single python processing running, taking very little CPU time. An strace of that process shows this: select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 32168}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 1000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 2000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 4000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 8000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 16000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 32000}) = 0 (Timeout) futex(0x3bcc8c0, FUTEXWAKEPRIVATE, 1) = 1 futex(0x3bcc8c0, FUTEXWAITBITSETPRIVATE|FUTEXCLOCKREALTIME, 0, NULL, ffffffff) = 0 futex(0x3bcc8c0, FUTEXWAITBITSETPRIVATE|FUTEXCLOCKREALTIME, 0, NULL, ffffffff) = -1 EAGAIN (Resourc e temporarily unavailable) futex(0x3bcc8c0, FUTEXWAKEPRIVATE, 1) = 1 select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) futex(0x3bcc8c0, FUTEXWAITBITSETPRIVATE|FUTEXCLOCKREALTIME, 0, NULL, ffffffff) = -1 EAGAIN (Resourc e temporarily unavailable) futex(0x3bcc8c0, FUTEXWAKEPRIVATE, 1) = 1 futex(0x3bcc8c0, FUTEXWAKEPRIVATE, 1) = 1 select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout) It appears that python is waiting for some I/O or something which never appears. Has anyone else seen this before? Any ideas of what is going on or how to fix it? -David

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