bug#75658: Non-deterministic Gash error in ‘gcc-mesboot-4.9.4’

[Ludovic Courtès]

Hello,

I stumbled upon this interesting non-deterministic failure while
building ‘gcc-mesboot-4.9.4.drv’ on current ‘core-packages-team’ (which
is unchanged compared to ‘master’):

--8<---------------cut here---------------start------------->8---
source directory: "/tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4" (relative 
from build: ".")
build directory: "/tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4"
configure flags: 
("CONFIG_SHELL=/gnu/store/bhmkf29xki04mmydpm0axpbh35md4vfb-gash-boot-0.3.0/bin/bash"
 "SHELL=/gnu/store/bhmkf29xki04mmydpm0axpbh35md4vfb-gash-boot-0.3.0/bin/bash" 
"--prefix=/gnu/store/mgbd56zvid129vkk8l9zir7pf46r5038-gcc-mesboot-4.9.4" 
"--enable-fast-install" "--build=x86_64-unknown-linux-gnu" 
"--prefix=/gnu/store/mgbd56zvid129vkk8l9zir7pf46r5038-gcc-mesboot-4.9.4" 
"--build=i686-unknown-linux-gnu" "--host=i686-unknown-linux-gnu" 
"--with-host-libstdcxx=-lsupc++" 
"--with-native-system-header-dir=/gnu/store/qxp7icgwbn1hqqwvkan7aljgzfn439zh-glibc-mesboot-2.16.0/include"
 
"--with-build-sysroot=/gnu/store/qxp7icgwbn1hqqwvkan7aljgzfn439zh-glibc-mesboot-2.16.0/include"
 "--disable-bootstrap" "--disable-decimal-float" "--disable-libatomic" 
"--disable-libcilkrts" "--disable-libgomp" "--disable-libitm" 
"--disable-libmudflap" "--disable-libquadmath" "--disable-libsanitizer" 
"--disable-libssp" "--disable-libvtv" "--disable-lto" "--disable-lto-plugin" 
"--disable-multilib" "--disable-plugin" "--disable-threads" 
"--enable-languages=c,c++" "--enable-static" "--enable-shared" 
"--enable-threads=single" "--disable-libstdcxx-pch" "--disable-build-with-cxx")
Backtrace:
In gash/eval.scm:
 221: 19 [eval-sh (<sh-set!> ("ac_useropt" (<sh-cmd-sub> #)))]
In srfi/srfi-1.scm:
 642: 18 [for-each #<procedure 1502320 at gash/eval.scm:221:17 (name word)> # #]
In gash/eval.scm:
 222: 17 [#<procedure 1502320 at gash/eval.scm:221:17 (name word)> "ac_useropt" 
#]
 131: 16 [eval-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
 121: 15 [expand-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
In gash/shell.scm:
 289: 14 [sh:substitute-command #<procedure 15022a0 at gash/eval.scm:129:35 ()>]
 270: 13 [%subshell #<procedure v ()>]
In ice-9/boot-9.scm:
 157: 12 [catch quit #<procedure v ()> ...]
In ice-9/r4rs.scm:
 176: 11 [with-output-to-port #<variable 13a02e0 value: #<output: file 39>> ...]
In srfi/srfi-1.scm:
 619: 10 [for-each #<procedure eval-sh (exp)> ((<sh-pipeline> # #))]
In gash/shell.scm:
 344: 9 [sh:pipeline #<procedure 1506f40 at gash/eval.scm:149:6 ()> ...]
 310: 8 [plumb #<input: #{read pipe}# 36> #f ...]
 270: 7 [%subshell #<procedure thunk* ()>]
In ice-9/boot-9.scm:
 157: 6 [catch quit #<procedure thunk* ()> ...]
In gash/shell.scm:
 316: 5 [thunk*]
 129: 4 [sh:exec-let () "sed" "s/[-+.]/_/g"]
  92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
 616: 2 [for-each #<procedure ec3b20 at gash/shell.scm:70:12 (i)> (0 1 2 ...)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file 38> "r" 7]
In unknown file:
   ?: 0 [fdopen 7 "r"]

ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
Backtrace:
In gash/eval.scm:
 221: 19 [eval-sh (<sh-set!> ("ac_useropt" (<sh-cmd-sub> #)))]
In srfi/srfi-1.scm:
 642: 18 [for-each #<procedure 1502320 at gash/eval.scm:221:17 (name word)> # #]
In gash/eval.scm:
 222: 17 [#<procedure 1502320 at gash/eval.scm:221:17 (name word)> "ac_useropt" 
#]
 131: 16 [eval-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
 121: 15 [expand-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
In gash/shell.scm:
 289: 14 [sh:substitute-command #<procedure 15022a0 at gash/eval.scm:129:35 ()>]
 270: 13 [%subshell #<procedure v ()>]
In ice-9/boot-9.scm:
 157: 12 [catch quit #<procedure v ()> ...]
In ice-9/r4rs.scm:
 176: 11 [with-output-to-port #<variable 13a02e0 value: #<output: file 39>> ...]
In srfi/srfi-1.scm:
 619: 10 [for-each #<procedure eval-sh (exp)> ((<sh-pipeline> # #))]
In gash/shell.scm:
 347: 9 [sh:pipeline #<procedure 1506f40 at gash/eval.scm:149:6 ()> ...]
 310: 8 [plumb #f #<output: #{write pipe}# 38> ...]
 270: 7 [%subshell #<procedure thunk* ()>]
In ice-9/boot-9.scm:
 157: 6 [catch quit #<procedure thunk* ()> ...]
In gash/shell.scm:
 316: 5 [thunk*]
 129: 4 [sh:exec-let () "printf" "%s\\n" "libsanitizer"]
  92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
 616: 2 [for-each #<procedure ec3b20 at gash/shell.scm:70:12 (i)> (0 1 2 ...)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file 36> "r" 7]
In unknown file:
   ?: 0 [fdopen 7 "r"]

ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
checking build system type... i686-unknown-linux-gnu
checking host system type... i686-unknown-linux-gnu
checking target system type... i686-unknown-linux-gnu
checking for a BSD-compatible install... ./install-sh -c
checking whether ln works... yes
checking whether ln -s works... yes
checking for a sed that does not truncate output... 
/gnu/store/i61mvrw30k8ng8hxym8s180nydnsbji6-gash-utils-boot-0.2.0/bin/sed
checking for gawk... gawk
checking for libsanitizer support... yes
--8<---------------cut here---------------end--------------->8---

What happens is that Gash crashes in the middle of a substitution on
$ac_useropt.  As a result, ‘--disable-libsanitizer’ (and other options,
it seems) are discarded, hence the “libsanitizer support... yes” line.
Hours later, build fails while trying to build libsanitizer.

Any idea what could cause EBADF?

Thanks,
Ludo’.