Re: issue with vredir6.sub and AIX - bash (sub-shell) is crashing durig manual replication of test

[Michael Felt]

Just repeated this on a system with bash that I did not package - and I
get the same results:

BASH_VERSINFO=([0]="4" [1]="4" [2]="0" [3]="1" [4]="release"
[5]="powerpc-ibm-aix6.1.0.0")
BASH_VERSION='4.4.0(1)-release'
...

```

_=/usr/bin/bash
aixtools@gcc119:[/home/aixtools]PS1='$ '
$ unset v
$ exec {v}</dev/null
$ echo $v
10
$ exec {v}<&-
$ ulimit -n
2000
$ ulimit -n 6
$ ulimit -n
6
$ exec </dev/null
$ exit
aixtools@gcc119:[/home/aixtools]
```

Thanks for your assistance in getting to the bottom of this!

Michael

On 15/10/2020 09:03, Michael Felt wrote:
> Hi.
>
> I don't actually use bash myself - so something that would be apparent
> to a bash user is invisible to me.
>
> As part of the packaging of bash-5.0.18 (i.e., 5.0 at patch level 18) I
> ran the test suite.
>
> a) is there a flag I can pass so that it ignores the UTF-8 tests? I do
> not want to not build UTF-8 support - for anyone who does load those
> language filesets, but I would prefer to not see that test show up as
> failed - rather as skipped.
>
> b) I have - apparently - been a LONG time since I last ran `make test`
> for bash, as I get the same error on bash-4.4 patch level 23, and on
> bash-5.0 patch level 11 and bash-5.0 patch level 18.
>
> run-vredir
> 14,16c14,16
> < ./vredir.tests: line 25: $v: A file descriptor does not refer to an
> open file.
> < ./vredir.tests: line 26: $v: A file descriptor does not refer to an
> open file.
> < ./vredir.tests: line 27: $v: A file descriptor does not refer to an
> open file.
> ---
>> ./vredir.tests: line 25: $v: Bad file descriptor
>> ./vredir.tests: line 26: $v: Bad file descriptor
>> ./vredir.tests: line 27: $v: Bad file descriptor
> 90,91c90,91
> < ./vredir6.sub: redirection error: cannot duplicate fd: The process
> file table is full.
> < ./vredir6.sub: line 13: /dev/null: The process file table is full.
> ---
>> ./vredir6.sub: redirection error: cannot duplicate fd: Invalid argument
>> ./vredir6.sub: line 13: /dev/null: Invalid argument
> root@x065:[/data/prj/gnu/bash/bash-4.4.23]
>
> To try and understand what is going on - I ran the following commands
> from the CLI. I hope you can give me some suggestions on what to look at.
>
> ```
>
> root@x065:[/data/prj/gnu/bash/bash-5.0.18]./bash
> root@x065:[/data/prj/gnu/bash/bash-5.0.18]PS1='$ '
> $ unset v
> $ exec {v}</dev/null
> $ echo $v
> 10
> $ exec {v}<&-
> $ ulimit -n
> 20000
> $ ulimit -n 6
> $ ulimit -n
> 6
> $ exec </dev/null
> $ exit
> root@x065:[/data/prj/gnu/bash/bash-5.0.18]
>
> ```
>
> As you can see by the return of the original PS1 - the sub-shell
> (./bash) 'crashed' -- I did not type 'exit' - that is a result of the
> 'exec </dev/null' command the line before.
>
> Hope this helps,
>
> Michael (aka aixtools).
>
>
>
>