That usually implies something in the profile/bashrc and such is
hitting the bug under some condition.
On Sun, May 21, 2023 at 5:14 PM Michael D. Setzer II via users
<users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On 21 May 2023 at 16:52, Roger Heflin wrote:
>
> From: Roger Heflin <rogerheflin@xxxxxxxxx>
> Date sent: Sun, 21 May 2023 16:52:56 -0500
> Subject: Re: Strange error running scripts. without
> #!/usr/bin/bash
> To: Community support for Fedora users
> <users@xxxxxxxxxxxxxxxxxxxxxxx>
> Send reply to: Community support for Fedora
> users <users@xxxxxxxxxxxxxxxxxxxxxxx>
>
> > You should be able to add -f (follow all forks) on strace and it will
> > follow everything. But without the script tracing POC mentions you
> > aren't really going to know what line gets the error.
> >
> > It is likely the bug is in one of the commands you are using, and it
> > may depend on the data you are getting and processing.
> >
>
> As a test, I put an echo command at start of program.
>
> echo START
> for a in $(ls -1rt status_cgi*); do
> n=$(echo "$a" | sed 's/status_cgi.//g;s/status_cgi//g');
> html2text -b0 "$a" >text."$n" ;
> grep "^Downstream" <text."$n" | sed
> 's/[[:alpha:]|]//g;s/^ //g;s/ / /g' | cut -f1,4,5,9 -d' '
> >down."$n" ;
> done
>
>
> ./mktext2x.sh
> free(): invalid next size (fast)
> Aborted (core dumped)
>
> Never displays START??
>
>
> The other version prints the Start and runs fine.
> #!/usr/bin/bash
> echo Start
> for a in $(ls -1rt status_cgi*); do
> n=$(echo "$a" | sed 's/status_cgi.//g;s/status_cgi//g');
> html2text -b0 "$a" >text."$n" ;
> grep "^Downstream" <text."$n" | sed
> 's/[[:alpha:]|]//g;s/^ //g;s/ / /g' | cut -f1,4,5,9 -d' '
> >down."$n" ;
> done
>
> Everything else is exactly the same.
> Currently have status_cgi thru status_cgi.321 so 322
> files.
>
> Another simpler test.
> cat start1.sh
> #!/usr/bin/bash
> echo Start
> cat start2.sh
> echo Start
> $ ./start1.sh
> Start
> $ ./start2.sh
> free(): invalid next size (fast)
> Aborted (core dumped)
>
> So, nothing but an echo command??
>
>
>
> > On Sun, May 21, 2023 at 4:39 PM Patrick O'Callaghan
> > <pocallaghan@xxxxxxxxx> wrote:
> > >
> > > On Mon, 2023-05-22 at 07:09 +1000, Michael D. Setzer II via users
> > > wrote:
> > > > Located the earlier script. It still gave the error so tried
> > > > strace and got
> > > > strace ./mktext2x.sh
> > > > execve("./mktext2x.sh", ["./mktext2x.sh"],
> > > > 0x7ffc37e55570 /* 35 vars */) = -1 ENOEXEC (Exec
> > > > format error)
> > > > strace: exec: Exec format error
> > > > +++ exited with 1 +++
> > > > But running the corrected one ran fine as is and with
> > > > strace.
> > > >
> > > > But then tried to run it again, and mktext2x.sh runs
> > > > without error?
> > > >
> > > > Running the one with bash line, strace works fine.
> > > > strace ./mktext2.sh
> > > > execve("./mktext2.sh", ["./mktext2.sh"], 0x7ffc9afbcb80
> > > > /* 63 vars */) = 0
> > > > brk(NULL) = 0x55a016794000
> > > >
> > >
> > > AFAIK what you're tracing here is the Shell itself, not the script
> > > (except indirectly), which is unlikely to be useful in most cases.
> > >
> > > You can do some tracing of Shell scripts. See for example
> > > https://www.tecmint.com/trace-shell-script-execution-in-linux/
> > >
> > > poc
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>
> +------------------------------------------------------------+
> Michael D. Setzer II - Computer Science Instructor
> (Retired)
> mailto:mikes@xxxxxxxx
> mailto:msetzerii@xxxxxxxxx
> Guam - Where America's Day Begins
> G4L Disk Imaging Project maintainer
> http://sourceforge.net/projects/g4l/
> +------------------------------------------------------------+
>
>
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