Re: [FFmpeg-devel] [PATCH 2/8] ffprobe/avtextformat: Rename and move writer functions and options

[Michael Niedermayer <michael@niedermayer.cc>]

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On Fri, Feb 28, 2025 at 01:47:05AM +0000, Soft Works wrote:
> 
> 
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Soft
> > Works
> > Sent: Freitag, 28. Februar 2025 02:31
> > To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> > Subject: Re: [FFmpeg-devel] [PATCH 2/8] ffprobe/avtextformat: Rename and
> > move writer functions and options
> > 
> > 
> > 
> > > -----Original Message-----
> > > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> > > Michael Niedermayer
> > > Sent: Freitag, 28. Februar 2025 02:23
> > > To: FFmpeg development discussions and patches <ffmpeg-
> > devel@ffmpeg.org>
> > > Subject: Re: [FFmpeg-devel] [PATCH 2/8] ffprobe/avtextformat: Rename
> > and
> > > move writer functions and options
> > >
> > > On Thu, Feb 27, 2025 at 02:01:34PM +0000, softworkz wrote:
> > > > From: softworkz <softworkz@hotmail.com>
> > > >
> > > > Signed-off-by: softworkz <softworkz@hotmail.com>
> > > > ---
> > > >  fftools/ffprobe.c                   | 910 ++++++-------------------
> > --
> > > -
> > > >  libavutil/Makefile                  |   1 +
> > > >  libavutil/avtextformat.h            |  50 ++
> > > >  libavutil/textformat/avtextformat.c | 620 +++++++++++++++++++
> > > >  4 files changed, 848 insertions(+), 733 deletions(-)
> > > >  create mode 100644 libavutil/textformat/avtextformat.c
> > >
> > > this and patch 1 crash
> > >
> > > ==1574970== Invalid read of size 1
> > > ==1574970==    at 0x483EF46: strlen (in /usr/lib/x86_64-linux-
> > > gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
> > > ==1574970==    by 0x7683D14: __vfprintf_internal (vfprintf-
> > > internal.c:1688)
> > > ==1574970==    by 0x7696F99: __vsnprintf_internal (vsnprintf.c:114)
> > > ==1574970==    by 0x1239AA1: av_vbprintf (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x1256473: av_log_default_callback (in
> > > ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x1256162: av_log (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x125CB4B: av_opt_set_defaults2 (in
> > ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x127611C: avtext_context_open (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x2F9672: main (in ffmpeg/ffprobe_g)
> > > ==1574970==  Address 0xffffffff is not stack'd, malloc'd or (recently)
> > > free'd
> > > ==1574970==
> > > ==1574970==
> > > ==1574970== Process terminating with default action of signal 11
> > > (SIGSEGV)
> > > ==1574970==  Access not within mapped region at address 0xFFFFFFFF
> > > ==1574970==    at 0x483EF46: strlen (in /usr/lib/x86_64-linux-
> > > gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
> > > ==1574970==    by 0x7683D14: __vfprintf_internal (vfprintf-
> > > internal.c:1688)
> > > ==1574970==    by 0x7696F99: __vsnprintf_internal (vsnprintf.c:114)
> > > ==1574970==    by 0x1239AA1: av_vbprintf (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x1256473: av_log_default_callback (in
> > > ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x1256162: av_log (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x125CB4B: av_opt_set_defaults2 (in
> > ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x127611C: avtext_context_open (in ffmpeg/ffprobe_g)
> > > ==1574970==    by 0x2F9672: main (in ffmpeg/ffprobe_g)
> > > ==1574970==  If you believe this happened as a result of a stack
> > > ==1574970==  overflow in your program's main thread (unlikely but
> > > ==1574970==  possible), you can try to increase the size of the
> > > ==1574970==  main thread stack using the --main-stacksize= flag.
> > > ==1574970==  The main thread stack size used in this run was 8388608.
> > >
> > > testcase: ./ffprobe_g -v 99 ~/tickets/3679/wgetmjpegdump
> > >
> > > tell me if this file is not in the ticket and ill send it to you
> > 
> > Hi Michael,
> > 
> > only patch 8/8 is expected to work. Since this is a RFC for the moment,
> > I spared the time for making sure that every single commit builds.
> > (please see cover letter notes in 0/8)
> > 
> > Once the direction is clear, I'll prepare a patchset with all commits
> > working of course.

ok


> > 
> > Thanks
> 
> Did you try 8/8 - does it pass for you? It's fine locally on x64 Linux, on AzDevops Linux x64 and on Patchwork andriy/make_fate_x86.
> But what bothers me a bit is that it failed on the Chinese CPU system.

i found the issue in 1+2 as a result of bisecting, so no the whole set
crashed

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The difference between a dictatorship and a democracy is that every 4 years
the population together is allowed to provide 1 bit of input to the government.

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