https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107235
Bug ID: 107235
Summary: m2/boot-bin/mc leaks file descriptors
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: modula2
Assignee: gaius at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
Target Milestone: ---
Target: *-*-solaris2.11
Building the current devel/modula-2 branch on Solaris 11.3/SPARC fails like
this:
m2/boot-bin/mc --olang=c++ --h-file-prefix=G
-I/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-libs
-I/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-compiler
-I/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-libiberty
-I/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-gcc --quiet --gcc-config-system
--extended-opaque -o=m2/gm2-compiler-boot/M2GCCDeclare.c
/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-compiler/M2GCCDeclare.mod
failed to open
/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-compiler/M2GCCDeclare.mod
(same for m2/gm2-libs/NumberIO.def).
Running mc under truss reveals
8687/1:
open("/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-libs/Debug.def",
O_RDONLY|O_XPG4OPEN) = 255
[...]
8687/1:
open("/vol/gcc/src/hg/master/modula-2/gcc/m2/gm2-compiler/M2GCCDeclare.mod",
O_RDONLY|O_XPG4OPEN) Err#24 EMFILE
8687/1: write(2, " f a i l e d t o o p".., 84) = 84
The file is opened several times (and apparent never closed), but the last
attempt (which would use fd 256) fails with EMFILE. This happens because
Solaris up to 11.3 has a low fd limit of 255.
Raising the resource limit to (say 1024) allows the open to succeed, but mc
fails again shortly thereafter due the the stdio's limit of 255 open files.
There's a work/hack around this by preloading
LD_PRELOAD_32=/usr/lib/extendedFILE.so.1
tjat allows the build to continue, but I'm pretty certain that mc leaks fds
here and could easily avoid this issue by closing files when they are no longer
needed.
