On 5/21/23 14:09, Michael D. Setzer II via users wrote:
On 21 May 2023 at 16:05, Go Canes wrote:
From: Go Canes <letsgonhlcanes0@xxxxxxxxx>
Date sent: Sun, 21 May 2023 16:05:06 -0400
Subject: Re: Strange error running scripts. without
#!/usr/bin/bash
To: mikes@xxxxxxxx,
Community support for Fedora users
<users@xxxxxxxxxxxxxxxxxxxxxxx>
On Sat, May 20, 2023 at 10:18 PM Michael D. Setzer II
<msetzerii@xxxxxxxxx> wrote:
Recently was getting a strange error when running a script that didn't have #!/usr/bin/bash at top?
free(): invalid next size (fast)
Aborted (core dumped)
Just adding the line fixes the issue, but not sure why??
Have run the script before with no such error, but had been a while? Script was just one line? Now 2 lines.
#!/usr/bin/bash
boincmgr -e /home/msetzerii/BOINC -d /home/msetzerii/BOINC
I understand that adding the shebang makes it likely that this was
something to do with the script, but was wondering if somehow the
"free" error was actually coming from boincmgr.
Also, any chance in the past you invoked it as "sh script.sh" as
opposed to "./script.sh"? And now you are just doing "./script.sh"?
That would explain the change in behavior.
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 always fails with strace without #! line?
The kernel can't exec a file that doesn't have a correct executable
format and strace doesn't have any fallback for if exec fails.
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