bug#63284: proot: Build gets stuck in test-0cf405b0 (and maybe test-25069c13)

[Ivan Vilata i Balaguer]

Hi!  It looks like some tests during the build of `proot` get stuck in the
version of Guix shown below:

```
$ LANG=C guix describe
Generation 56   May 02 2023 11:25:26    (current)
  guix 3f8c489
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 3f8c4899a9a67bb509a603bd21dcfcfab88c0e8e
```

Since `top` reported a couple of tests getting stuck, I first ran `guix build
-c1 proot`; its last lines were:

```
  CHECK test-pppppppp ok
  CHECK test-proocare skipped
  CHECK test-ptrace-exec-trap ok
  CHECK test-python01 ok
  CHECK test-rrrrrrrr ok
  CHECK test-tempdire ok
  CHECK test-wwwwwwww ok
  CHECK test-yyyyyyyy ok
```

It got stock there and `top` reported the following test (`test-0cf405b0`)
using CPU:

```
21490 guixbui+  20   0   10,8m   4,0m   0,0   0,0   0:00.03 S              `- 
make check -C test -j 1
24340 guixbui+  20   0    6,4m   2,9m   0,0   0,0   0:00.00 S                  
`- /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/sh -c if 
[ -e /tmp/guix-build-proot-5.3.0.drv-0/source/test//rootfs/bin/test-0cf405b0 ]; 
then /tmp/guix+
24341 guixbui+  20   0    7,1m   3,1m  55,0   0,0   0:42.21 S                   
   `- /tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot -b /proc -r 
/tmp/guix-build-proot-5.3.0.drv-0/source/test//rootfs /bin/test-0cf405b0
24342 guixbui+  20   0    0,9m   0,4m  45,7   0,0   0:34.71 t                   
       `-
```

Then I ran again `guix build -c4 proot` (4 cores is the default on my
computer); its last lines were:

```
  CHECK test-pppppppp ok
  CHECK test-proocare skipped
  CHECK test-ptrace-exec-trap ok
  CHECK test-python01 ok
  CHECK test-rrrrrrrr ok
  CHECK test-tempdire ok
  CHECK test-wwwwwwww ok
  CHECK test-yyyyyyyy ok
  CHECK test-gdb-ptrace ok
  CHECK test-1c68c218 ok
  CHECK test-305ae31d ok
  CHECK test-33333333 ok
  CHECK test-33333334 ok
  CHECK test-44444444 ok
  CHECK test-51943658 ok
  CHECK test-66666666 ok
  CHECK test-79cf6614 ok
  CHECK test-88888888 ok
  CHECK test-a8e69d6f ok
  CHECK test-af062114 ok
  CHECK test-bug-138 ok
  CHECK test-c10e2073 ok
  CHECK test-d2175fc4 ok
  CHECK test-e87b34ae ok
  CHECK test-nnnnnnnn ok
  CHECK test-oooooooo ok
  CHECK test-ptrace00 ok
  CHECK test-ptrace01 ok
  CHECK test-ssssssss ok
  CHECK test-xxxxxxxx ok
```

It got stock there and `top` reported the following tests (`test-0cf405b0` and
`test-25069c12`) taking CPU:

```
 9960 guixbui+  20   0   11,0m   4,0m   0,0   0,0   0:00.06 S              `- 
make check -C test -j 4
10535 guixbui+  20   0    6,4m   2,9m   0,0   0,0   0:00.00 S                  
`- /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/sh -c if 
[ -e test-25069c12 ]; then 
/tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot ./test-+
10536 guixbui+  20   0    7,1m   3,1m  66,0   0,0  17:29.84 R                   
   `- /tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot 
./test-25069c12
10537 guixbui+  20   0    0,4m   0,1m  32,1   0,0   8:36.58 t                   
       `-
10543 guixbui+  20   0    6,4m   2,9m   0,0   0,0   0:00.00 S                  
`- /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/sh -c if 
[ -e test-25069c13 ]; then 
/tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot ./test-+
10544 guixbui+  20   0    7,1m   3,1m  66,0   0,0  17:29.99 R                   
   `- /tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot 
./test-25069c13
10545 guixbui+  20   0    0,4m   0,1m  32,1   0,0   8:36.61 t                   
       `-
13202 guixbui+  20   0    6,4m   2,9m   0,0   0,0   0:00.00 S                  
`- /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/sh -c if 
[ -e /tmp/guix-build-proot-5.3.0.drv-0/source/test//rootfs/bin/test-0cf405b0 ]; 
then /tmp/guix+
13203 guixbui+  20   0    7,1m   3,1m  52,8   0,0  13:52.96 S                   
   `- /tmp/guix-build-proot-5.3.0.drv-0/source/test//../src/proot -b /proc -r 
/tmp/guix-build-proot-5.3.0.drv-0/source/test//rootfs /bin/test-0cf405b0
13204 guixbui+  20   0    0,9m   0,0m  44,0   0,0  11:43.34 R                   
       `-
```

Thanks and cheers!

-- 
Ivan Vilata i Balaguer -- https://elvil.net/

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