msys2: Resource temporarily unavailable

[thutt]

address@hidden writes:
 >
 > Hello everyone,
 >
 >   We are using Gnu Make 4.1 from a somewhat recent installation of
 >   msys2 as part of a very large build system.
 >
 >   We are periodically seeing:
 >
 >     make: fork: Resource temporarily unavailable
 >
 >   We don't know the specific conditions to reproduce the mesasge,
 >   yet.
 >
 >   This message appears to be produced by the msys2 runtime library.
 >   It corresponds to EAGAIN.
 >
 >   Because I haven't figured out how to get the sources for Make into
 >   my local msys2 installation, I've been looking at the Make 4.1
 >   sources on Linux.  I can't find a reference to fork, and the code is
 >   so heavily conditionalize it's really hard to read and figure out
 >   what is supposed to happen if 'fork' failed.
 >
 >   So, I came here to ask:
 >
 >     On cygwin/msys, if this message is seen on the console, what
 >     should I expect to happen?
 >
 >
 >     Does make try again?
 >     Does make immediately exit with a return code of 2?
 >     Something else?

 As I said previously, the basic asnwers to how make behaves were
 determined with some LD_PRELOAD work.  This information allowed
 further progress.

 The root cause of the problem is msys2.

 There are a couple memory overrun / corruption issues that occur when
 it translates Windows-style pathnames to POSIX-style.  The
 translation occurs on command line arguments and environment
 variables.  We have a patch that addresses the issue; working to get
 permission to upstream it.

 It can manifest itself as 'Bad address' when launching Make (most
 frequent), or as 'Resource temporarily unavailable' if Make was
 launched.  It's fairly rare (1-3 occurrences in 1000-4000 daily build
 process runs).

--
The sixth Sheik's sixth sick sheep died of hoof and mouth disease.