On Sep 04 07:03:31, normalper...@yhbt.net wrote:
> Adding sox-devel to Cc:, Jan was able to trigger a segfault on
> OpenBSD i386 with the below example on 14.4.1.
>
> Jan Stary <h...@stare.cz> wrote:
> > On Sep 04 06:22:25, normalper...@yhbt.net wrote:
> > > Can you replace .wav with .sox (or other formats) and reproduce the
> > > issue with a different format?
> >
> > The same happens with the .sox format:
> >
> > $ sox -n one.sox synth 4.145 sin 440 gain -6
> > $ sox -n two.sox synth 5.325 sin 540 gain -6
> > $ sox -V "|sox one.sox -p trim 0 -`soxi -D two.sox`" two.sox out.sox
> > sox: SoX v14.4.1
> > sox INFO formats: detected file format type `sox'
> > sox FAIL trim: Position 2 is before start of audio.
> > sox INFO formats: detected file format type `sox'
> > Segmentation fault (core dumped)
> >
> >
> > > > > > Can you fire up gdb on the core dump and show us the backtrace?
> > > > > > (hopefully your sox build has debugging symbols). Thanks.
>
> > #0 memcpy ()
> > at /usr/src/lib/libc/arch/i386/string/bcopy.S:88
> > 88 rep
> > (gdb) bt
> > #0 memcpy () at /usr/src/lib/libc/arch/i386/string/bcopy.S:88
> > #1 0x06c2394b in fread (buf=0xcfbd6e24, size=1, count=4, fp=0x26bb8f98)
> > at /usr/src/lib/libc/stdio/fread.c:69
> > #2 0x0506eac1 in lsx_readbuf () from /usr/local/lib/libsox.so.3.0
> > #3 0x0506ef00 in lsx_read_dw_buf () from /usr/local/lib/libsox.so.3.0
> > #4 0x0506ef91 in lsx_readdw () from /usr/local/lib/libsox.so.3.0
> > #5 0x050713af in startread () from /usr/local/lib/libsox.so.3.0
> > #6 0x0506d2b7 in open_read () from /usr/local/lib/libsox.so.3.0
>
> OK, based on the above I suspect it's in the pipe handling code and not
> a problem with trim itself. That code (in src/formats.c) contains some
> strange OS-specific code for rewinding pipes, and I haven't looked
> closely at it.
I suppose you mean the rewind_pipe() function,
which indeed looks like a dirty hack to my nonexpert eyes.
I will try to point some OpenBSD people who know SoX
at this code.
> Can you reproduce the issue by using a temporary file instead of a pipe?
> I strongly suspect this is OpenBSD-specific and only to pipes.
SoX refuses to make the temporary file:
$ sox -n one.sox synth 4.145 sin 440 gain -6
$ sox -n two.sox synth 5.325 sin 540 gain -6
$ sox one.sox part.sox trim 0 -`soxi -D two.sox`
sox FAIL trim: Position 2 is before start of audio.
which probably is the right thing. But with the pipe,
it tries to go on, and crashes. Which might be a hint
that it really is a pipe problem (namely, trying to rewind a pipe)
and not a trim problem, right?
Jan
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