Date: Wed, 19 Nov 2014 13:06:26 -0800 From: John-Mark Gurney <jmg@funkthat.com> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-hackers@freebsd.org, Dieter BSD <dieterbsd@gmail.com> Subject: Re: Running 8 building 10 gives "Out of file descriptors" ? Message-ID: <20141119210626.GT24601@funkthat.com> In-Reply-To: <1416365518.1147.84.camel@revolution.hippie.lan> References: <CAA3ZYrBJajkeV-wO8CWHo3TODjHDt=qkiCniU%2BT07%2BNjvyid3A@mail.gmail.com> <1416365518.1147.84.camel@revolution.hippie.lan>
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Ian Lepore wrote this message on Tue, Nov 18, 2014 at 19:51 -0700:
> On Tue, 2014-11-18 at 18:22 -0800, Dieter BSD wrote:
> > > I've been building 10.x and 11.x world and kernel from source on an 8.2
> > > (and more recently now 8.4) system for a couple years, as recently as
> > > last night. I've never needed to do anything special. When I check
> > > sysctl kern.maxfiles it's set to 12328, not so different from yours.
> > >
> > > I wonder if some long-running process on your system is leaking away
> > > descriptors? A 'procstat -af' might help find that.
> >
> > Uptime is less than 3 days. (System hung a couple days ago, shutting off
> > the signal to the display. No core dump. No clues as to *why* it hung.
> > *grumble* )
> >
> > >> getdtablesize() returned 11095
> >
> > kern.maxfiles: 12328
> >
> > # procstat -af | wc -l
> > 1912
> >
> > I ran
> > while true ; do procstat -af | wc -l; sleep 0.03 ; done
> > in one window, and
> > make kernel-toolchain
> > in another window. Never got above 2000. Not absolute proof, but
> > it looks like it is not really running out of descriptors.
> >
> > chmod 0 /usr/bin/mkdep
> > gives the expected permission denied. (proves that it is trying to
> > run /usr/bin/mkdep)
> >
> > Restore the mode and change /usr/bin/mkdep to
> > #!/bin/sh
> > echo hello from mkdep
> > and I'm back to "Out of file descriptors". And it doesn't print hello.
> >
> > So... make (I assume?) thinks (incorrectly?) that it is running out of
> > file descriptors attempting to run /usr/bin/mkdep?
>
> Oh. Hrm. The only thing in the source that says that exact message is
> in /bin/sh input.c, and it looks like this:
>
> fd2 = fcntl(fd, F_DUPFD_CLOEXEC, 10);
> close(fd);
> if (fd2 < 0)
> error("Out of file descriptors");
>
> So you have guess what the actual error is, or hack the code to print
> errno or something.
ktrace+kdump can give you the return value of fcntl...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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