RFR: JDK-8154326: bash >(...) construct causes race conditions
erik.joelsson at oracle.com
Tue Apr 19 12:32:34 UTC 2016
After switching to the new hotspot build, we have seen some sporadic
build errors related to the generation of dtrace JvmOffsets.h file on
Solaris. The errors look like a compile target that depends on the
header file fails because the header file is either empty or incomplete.
I have managed to reproduce this by running this particular part of the
build in a loop within 5 minutes.
The header file generation uses the rather new ExecuteWithLog macro,
which uses the also rather new ">(tee logfile)" construct to save output
to a log file while still echoing both stderr and stdout separately to
the console. It seems however, that when using this construct, bash
spawns background processes which may not be done when the main process
I have noted a similar effect when switching to this construct for the
main makefile build.log. The last line of make output would be echoed to
the console after my prompt returned.
To solve this, I added "&& wait" in each location where the >(...) trick
is used. I have then rerun the loop over night and could no longer
reproduce the problem. I believe this to be the proper solution.
More information about the build-dev