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Subject: Re: truss(1) gets confused after execve
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On Tue, 19 Jun 2007, Michiel Boland wrote:

> Hi. If i truss the following program
>
> #include <unistd.h>
>
> extern char **environ;
>
> int main(int argc, char **argv)
> {
>        execve("/usr/bin/false", argv, environ);
>        return 1;
> }
>
> then everything after the execve() call is reported as garbage.
> E.g. something like
> [snip]
>
> execve("/usr/bin/false",<missing argument>,<missing argument>)
> execve("/usr/bin/false",<missing argument>,<missing argument>) = 0 (0x0)
> -- UNKNOWN SYSCALL -6040 --
> (null)(0x0,0x7fffffffe880,0x0,0x0,0x0)           = 198 (0xc6)
> -- UNKNOWN SYSCALL 5394432 --
> (null)(0xc5,0x0,0x2a0,0x3,0x1000)                = 73 (0x49)
> -- UNKNOWN SYSCALL 5394432 --
>
> etc.
>
> Something looks not quite right here.
> This is -CURRENT on amd64 if that matters.
>
> Also, truss on amd64 appears to coredump if the above program is compiled with 
> -m32. Probably because it gets the size of the argv and envp arguments wrong.
>
> Anyone looking into this yet? I could not find any relevant PRs with the word 
> truss in the title.
>
> Cheers
> Michiel

This might be related to my issues with pkg_add, profiling and coredumps. Did you rebuild CURRENT recently?

-Garrett