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zbar-0.23.93p1 segfaults, on -current 2026q3
On 2026/09/05 09:52, Mikolaj Kucharski wrote:
> Kind reminder.
thanks, committed
> On Mon, Aug 31, 2026 at 08:55:50AM +0000, Mikolaj Kucharski wrote:
> > Hi.
> >
> > Finally came to test Stuart's patch. It fixes the problem for me.
> > Thanks.
> >
> > On Tue, Aug 18, 2026 at 10:11:00AM +1000, Jonathan Gray wrote:
> > > On Mon, Aug 17, 2026 at 09:37:30PM +0100, Stuart Henderson wrote:
> > > > On 2026/08/17 18:56, Mikolaj Kucharski wrote:
> > > > > Hi all.
> > > > >
> > > > > I see consisent segmentation fault with `zbarimg -q --raw sample.png`
> > > > > command. I don't have usable core at present, so don't have any more
> > > > > info, but I am asking do you see the same? I took few random QR codes
> > > > > from the Internet and they all dump the core with above command.
> > > > >
> > > > > I was using over the years zbarimg many times, so I didn't see this
> > > > > before. I see this on two separate machines.
> > > >
> > > > I see it here too, also with other image formats, and with zbar compiled
> > > > with any of base llvm 22, ports llvm 21, ports gcc 16, on amd64 and
> > > > aarch64. Also same if I use packages from just before the ImageMagick
> > > > update.
> > > >
> > > > Found a slightly older laptop and updated to 2026-05-15-0105
> > > > packages from ftp.hostserver.de archive, and zbar from there works.
> > > >
> > > > Stepping forward the zbar package from 2026-05-30-0105 works,
> > > > updating just zbar to the package from 2026-06-01-0105 without
> > > > touching any other package it starts segfaulting.
> > > >
> > > > The big thing that is likely to be in this window is LLVM 22.
> > > >
> > > > Here's a backtrace from one of the times it crashed.
> > > >
> > > > $ egdb zbarimg
> > > > GNU gdb (GDB) 17.2
> > > > Copyright (C) 2025 Free Software Foundation, Inc.
> > > > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> > > > This is free software: you are free to change and redistribute it.
> > > > There is NO WARRANTY, to the extent permitted by law.
> > > > Type "show copying" and "show warranty" for details.
> > > > This GDB was configured as "x86_64-unknown-openbsd8.0".
> > > > Type "show configuration" for configuration details.
> > > > For bug reporting instructions, please see:
> > > > <https://www.gnu.org/software/gdb/bugs/>.
> > > > Find the GDB manual and other documentation resources online at:
> > > > <http://www.gnu.org/software/gdb/documentation/>.
> > > >
> > > > For help, type "help".
> > > > Type "apropos word" to search for commands related to "word"...
> > > > Reading symbols from zbarimg...
> > > > Reading symbols from /usr/local/bin/.debug/zbarimg.dbg...
> > > > (gdb) set args --verbose=999 somefile.png
> > > > (gdb) r
> > > > Starting program: /usr/local/bin/zbarimg --verbose=999 somefile.png
> > > > _zbar_process_image: processing: Y800(30303859) 324x234 @0x2e14426f000
> > > > _zbar_scan_image: img_x+: 0000,0000 @0x2e14426f000
> > > > _zbar_scan_image: img_x-: 0323,0001 @0x2e14426f287
> > > >
> > > > Program received signal SIGSEGV, Segmentation fault.
> > > > _zbar_scan_image (iscn=0x2e17de0dd80, img=0x2e0d0cfa310) at img_scanner.c:964
> > > > 964 uint8_t d = *p;
> > > > (gdb) bt
> > > > #0 _zbar_scan_image (iscn=0x2e17de0dd80, img=0x2e0d0cfa310) at img_scanner.c:964
> > > > #1 0x000002e136700ae9 in zbar_scan_image (iscn=0x2e0d0d06880, img=0x0) at img_scanner.c:1128
> > > > #2 0x000002e1366fa5f1 in _zbar_process_image (proc=0x2e0d0d2b480, img=0x2e0d0cfa540) at processor.c:84
> > > > #3 0x000002e1366fc50c in zbar_process_image (proc=0x2e0d0d2b480, img=0x2e0d0cfa540) at processor.c:707
> > > > #4 0x000002de9426d5a6 in scan_image (filename=0x7743e50f5b7d "somefile.png") at zbarimg/zbarimg.c:209
> > > > #5 0x000002de9426ccf8 in main (argc=3, argv=0x7743e50f5908) at zbarimg/zbarimg.c:448
> > > > (gdb) frame 2
> > > > #2 0x000002e1366fa5f1 in _zbar_process_image (proc=0x2e0d0d2b480, img=0x2e0d0cfa540) at processor.c:84
> > > > 84 nsyms = zbar_scan_image(proc->scanner, tmp);
> > > > (gdb) list
> > > > 79 if (proc->syms) {
> > > > 80 zbar_symbol_set_ref(proc->syms, -1);
> > > > 81 proc->syms = NULL;
> > > > 82 }
> > > > 83 zbar_image_scanner_recycle_image(proc->scanner, img);
> > > > 84 nsyms = zbar_scan_image(proc->scanner, tmp);
> > > > 85 _zbar_image_swap_symbols(img, tmp);
> > > > 86
> > > > 87 zbar_image_destroy(tmp);
> > > > 88 tmp = NULL;
> > > > (gdb) p tmp
> > > > $1 = (zbar_image_t *) 0x2e0d0cfa310
> > > > (gdb) p *tmp
> > > > $2 = {
> > > > format = 808466521,
> > > > width = 324,
> > > > height = 234,
> > > > data = 0x2e14426f000,
> > > > datalen = 75816,
> > > > crop_x = 0,
> > > > crop_y = 0,
> > > > crop_w = 324,
> > > > crop_h = 234,
> > > > userdata = 0x0,
> > > > cleanup = 0x2e1366f8780 <cleanup_ref>,
> > > > refcnt = 1,
> > > > src = 0x0,
> > > > srcidx = -1,
> > > > next = 0x2e0d0cfa540,
> > > > seq = 0,
> > > > syms = 0x2e0d0d2ffc0
> > > > }
> > > > (gdb) frame 3
> > > > #3 0x000002e1366fc50c in zbar_process_image (proc=0x2e0d0d2b480, img=0x2e0d0cfa540) at processor.c:707
> > > > 707 rc = _zbar_process_image(proc, img);
> > > > (gdb) p img
> > > > $3 = (zbar_image_t *) 0x2e0d0cfa540
> > > > (gdb) list
> > > > 702 rc = _zbar_processor_set_size(proc, zbar_image_get_width(img),
> > > > 703 zbar_image_get_height(img));
> > > > 704 if (!rc) {
> > > > 705 zbar_image_scanner_enable_cache(proc->scanner, 0);
> > > > 706 zbar_image_scanner_request_dbus(proc->scanner, proc->is_dbus_enabled);
> > > > 707 rc = _zbar_process_image(proc, img);
> > > > 708 if (proc->streaming)
> > > > 709 zbar_image_scanner_enable_cache(proc->scanner, 1);
> > > > 710 }
> > > > 711
> > > >
> > > > On another machine which is closer to -current, recompiling zbar with
> > > > -O1 I still get SEGV, but with -O0 it works ok.
> > > >
> > > > Belatedly thought to check issues/PRs and found
> > > > https://github.com/mchehab/zbar/pull/329 which would explain it,
> > > > and tests concur.
> > > >
> > > > ok?
> > >
> > > there are other (slightly different) PRs as well
> > > https://github.com/mchehab/zbar/pull/299
> > > https://github.com/mchehab/zbar/pull/332
> > >
> > > ok jsg@
> > >
> > > >
> > > > Index: Makefile
> > > > ===================================================================
> > > > RCS file: /cvs/ports/graphics/zbar/Makefile,v
> > > > diff -u -p -r1.40 Makefile
> > > > --- Makefile 17 Aug 2026 19:36:49 -0000 1.40
> > > > +++ Makefile 17 Aug 2026 20:36:57 -0000
> > > > @@ -1,7 +1,7 @@
> > > > COMMENT= ZBar barcode reader
> > > >
> > > > DISTNAME= zbar-0.23.93
> > > > -REVISION= 2
> > > > +REVISION= 3
> > > >
> > > > SHARED_LIBS= zbar 0.1 \
> > > > zbargtk 0.1
> > > > Index: patches/patch-zbar_img_scanner_c
> > > > ===================================================================
> > > > RCS file: patches/patch-zbar_img_scanner_c
> > > > diff -N patches/patch-zbar_img_scanner_c
> > > > --- /dev/null 1 Jan 1970 00:00:00 -0000
> > > > +++ patches/patch-zbar_img_scanner_c 17 Aug 2026 20:36:57 -0000
> > > > @@ -0,0 +1,22 @@
> > > > +https://github.com/mchehab/zbar/pull/329, plus pull in stddef.h
> > > > +
> > > > +Index: zbar/img_scanner.c
> > > > +--- zbar/img_scanner.c.orig
> > > > ++++ zbar/img_scanner.c
> > > > +@@ -33,6 +33,7 @@
> > > > + #endif
> > > > +
> > > > + #include <assert.h>
> > > > ++#include <stddef.h> /* ptrdiff_t */
> > > > + #include <stdlib.h> /* malloc, free */
> > > > + #include <string.h> /* memcmp, memset, memcpy */
> > > > +
> > > > +@@ -862,7 +863,7 @@ static void zbar_send_code_via_dbus(zbar_image_scanner
> > > > + do { \
> > > > + x += (dx); \
> > > > + y += (dy); \
> > > > +- p += (dx) + ((uintptr_t)(dy)*w); \
> > > > ++ p += (ptrdiff_t)(dx) + (intptr_t)(dy) * (intptr_t)w; \
> > > > + } while (0);
> > > > +
> > > > + static void *_zbar_scan_image(zbar_image_scanner_t *iscn, zbar_image_t *img)
> > > >
> > > >
> > >
>
> --
> Regards,
> Mikolaj
>
zbar-0.23.93p1 segfaults, on -current 2026q3