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From GitBox <...@apache.org>
Subject [GitHub] [tvm] areusch commented on issue #8728: Possible flakey tests/micro/zephyr/test_zephyr.py "test_relay[mps2_an521]"
Date Fri, 03 Sep 2021 10:46:39 GMT

areusch commented on issue #8728:
URL: https://github.com/apache/tvm/issues/8728#issuecomment-912444859


   the current thinking on these is that it's potentially a QEMU-side issue that is triggered
by running a bunch of tests in a row. this test started failing with the #8595 effort. I haven't
been able to reproduce it locally in the same way it's failing in the CI. However, at one
point during development, we were failing to kill the qemu process and thereby leaving ~10
qemu-system-arm running. If you used a less powerful machine, you could reproduce a similar
effect. 
   
   When I was able to reproduce this locally, I connected to the emulated ARM system via gdb
and reset it. This timeout occurs while TVM is waiting to read an RPC reply from the emulated
serial port. I was able to observe that, after resetting the emulated ARM system (while TVM
was waiting for a reply), the rebooted ARM system could actually send UART data and TVM could
read that data. However, the ARM system did not seem to be able to receive UART data from
TVM.
   
   This leads me to suspect one of two root causes:
   1) a bug in the Zephyr firmware for MPS2_AN521 that may only manifest itself on QEMU
   2) a race condition in the Zephyr qemu UART emulation that fails to transmit data *to*
the ARM system, but can read it back just fine.
   
   @gromero was investigating this before I went on PTO Aug 19. any updates? Perhaps we should
consider temporarily disabling mps2_an521 until we can root-cause and fix this.


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