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[Bug 1807355] [NEW] Crash During Using Centering Tool or Layers

To: ubuntustudio-bugs@xxxxxxxxxxxxxxxxxxx
From: "Ilya Ig. Petrov" <1807355@xxxxxxxxxxxxxxxxxx>
Date: Fri, 07 Dec 2018 09:37:15 -0000
Reply-to: Bug 1807355 <1807355@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

```
GNU Image Manipulation Program version 2.10.6
git-describe: GIMP_2_10_4-278-g0a8173ffde
C compiler:
	Using built-in specs.
	COLLECT_GCC=gcc
	COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
	OFFLOAD_TARGET_NAMES=nvptx-none
	OFFLOAD_TARGET_DEFAULT=1
	Target: x86_64-linux-gnu
	Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.2.0-4ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
	Thread model: posix
	gcc version 8.2.0 (Ubuntu 8.2.0-4ubuntu1) 
	
using GEGL version 0.4.8 (compiled against version 0.4.8)
using GLib version 2.58.1 (compiled against version 2.57.2)
using GdkPixbuf version 2.38.0 (compiled against version 2.36.12)
using GTK+ version 2.24.32 (compiled against version 2.24.32)
using Pango version 1.42.3 (compiled against version 1.42.3)
using Fontconfig version 2.13.0 (compiled against version 2.13.0)
using Cairo version 1.15.12 (compiled against version 1.15.12)

```
> fatal error: Aborted

Stack trace:
```

# Stack traces obtained from PID 11039 - Thread 11039 #

[New LWP 11040]
[New LWP 11041]
[New LWP 11042]
[New LWP 11043]
[New LWP 11058]
[New LWP 11139]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
__libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
  Id   Target Id                                       Frame 
* 1    Thread 0x7f8705686e00 (LWP 11039) "gimp-2.10"   __libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
  2    Thread 0x7f8704735700 (LWP 11040) "gmain"       0x00007f870850c6d9 in __GI___poll (fds=0x5628975f2a50, nfds=2, timeout=3997) at ../sysdeps/unix/sysv/linux/poll.c:29
  3    Thread 0x7f87023cf700 (LWP 11041) "gdbus"       0x00007f870850c6d9 in __GI___poll (fds=0x5628975c9930, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  4    Thread 0x7f86ed48c700 (LWP 11042) "async"       syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  5    Thread 0x7f86ecc8b700 (LWP 11043) "worker"      syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  6    Thread 0x7f86e6317700 (LWP 11058) "swap writer" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  7    Thread 0x7f86e7fff700 (LWP 11139) "pool"        syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38

Thread 7 (Thread 0x7f86e7fff700 (LWP 11139)):
#0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f870882a75a in g_cond_wait_until () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f87087b6061 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f87087b6621 in g_async_queue_timeout_pop () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f870880cb71 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217394657024, 546695890381745290, 140726349083406, 140726349083407, 140726349083536, 140217394653440, -532674918553310070, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#7  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f86e6317700 (LWP 11058)):
#0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8709299375 in  () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
#3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217364346624, 546695890381745290, 140726349086222, 140726349086223, 140726349086352, 140217364343040, -532676658015064950, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f86ecc8b700 (LWP 11043)):
#0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x0000562896133673 in  ()
#3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217474922240, 546695890381745290, 140726349091598, 140726349091599, 140726349091728, 140217474918656, -532664363671180150, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f86ed48c700 (LWP 11042)):
#0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x000056289613348a in  ()
#3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217483314944, 546695890381745290, 140726349091614, 140726349091615, 140726349091744, 140217483311360, -532661064599425910, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f87023cf700 (LWP 11041)):
#0  0x00007f870850c6d9 in __GI___poll (fds=0x5628975c9930, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f87087e3e46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f87087e41d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f870915f7b6 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217834862336, 546695890381745290, 140726349091710, 140726349091711, 140726349091840, 140217834858752, -533600148998148982, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f8704735700 (LWP 11040)):
#0  0x00007f870850c6d9 in __GI___poll (fds=0x5628975f2a50, nfds=2, timeout=3997) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f87087e3e46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f87087e3f6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f87087e3fb1 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217871980288, 546695890381745290, 140726349091310, 140726349091311, 140726349091440, 140217871976704, -533595318233682806, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f8705686e00 (LWP 11039)):
#0  0x00007f87085f9c24 in __libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
        resultvar = 18446744073709551104
        sc_cancel_oldtype = 1
        sc_ret = <optimized out>
        nbytes = 256
        fd = 14
        buf = 0x7ffd680c4910
#1  0x00007f870986e7d4 in gimp_stack_trace_print () at /usr/lib/libgimpbase-2.0.so.0
#2  0x0000562895e712a0 in  ()
#3  0x0000562895e716d8 in  ()
#4  0x0000562895e71e37 in  ()
#5  0x00007f87085fadd0 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f870843f077 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 94732404675696, 140217957927312, 140217936274223, 4222451712, 94732404675696, 94732404675797, 94732404675696, 94732404675696, 94732404675799, 94732404675996, 94732404675696, 94732404675996, 0, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
#7  0x00007f8708420535 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x56289b2526d0, sa_sigaction = 0x56289b2526d0}, sa_mask = {__val = {0, 7, 6, 0, 0, 0, 140726349091400, 21474836480, 140726349091248, 140217937494624, 140217937479768, 0, 3780789113705692160, 140217937464570, 0, 140217937479768}}, sa_flags = 137803379, sa_restorer = 0x7f870836b808}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#8  0x00007f870842040f in __assert_fail_base (fmt=0x7f87085ac858 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f870836b808 "!xcb_xlib_threads_sequence_lost", file=0x7f870836b673 "../../src/xcb_io.c", line=263, function=<optimized out>) at assert.c:92
        str = 0x56289b2526d0 "\360\262\227\233(V"
        total = 4096
#9  0x00007f8708430142 in __GI___assert_fail (assertion=0x7f870836b808 "!xcb_xlib_threads_sequence_lost", file=0x7f870836b673 "../../src/xcb_io.c", line=263, function=0x7f870836bac0 "poll_for_event") at assert.c:101
#10 0x00007f87082f95db in  () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#11 0x00007f87082f9680 in  () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#12 0x00007f87082f997d in _XEventsQueued () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#13 0x00007f87082eb6d7 in XPending () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#14 0x00007f870992c9f5 in  () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#15 0x00007f87087e3821 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f87087e3df0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f87087e41d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x0000562895e70acf in app_run ()
#19 0x0000562895e703d5 in main ()
[Inferior 1 (process 11039) detached]

```

** Affects: gimp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1807355

Title:
  Crash During Using Centering Tool or Layers

Status in gimp package in Ubuntu:
  New

Bug description:
  ```
  GNU Image Manipulation Program version 2.10.6
  git-describe: GIMP_2_10_4-278-g0a8173ffde
  C compiler:
  	Using built-in specs.
  	COLLECT_GCC=gcc
  	COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
  	OFFLOAD_TARGET_NAMES=nvptx-none
  	OFFLOAD_TARGET_DEFAULT=1
  	Target: x86_64-linux-gnu
  	Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.2.0-4ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
  	Thread model: posix
  	gcc version 8.2.0 (Ubuntu 8.2.0-4ubuntu1) 
  	
  using GEGL version 0.4.8 (compiled against version 0.4.8)
  using GLib version 2.58.1 (compiled against version 2.57.2)
  using GdkPixbuf version 2.38.0 (compiled against version 2.36.12)
  using GTK+ version 2.24.32 (compiled against version 2.24.32)
  using Pango version 1.42.3 (compiled against version 1.42.3)
  using Fontconfig version 2.13.0 (compiled against version 2.13.0)
  using Cairo version 1.15.12 (compiled against version 1.15.12)

  ```
  > fatal error: Aborted

  Stack trace:
  ```

  # Stack traces obtained from PID 11039 - Thread 11039 #

  [New LWP 11040]
  [New LWP 11041]
  [New LWP 11042]
  [New LWP 11043]
  [New LWP 11058]
  [New LWP 11139]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  __libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
    Id   Target Id                                       Frame 
  * 1    Thread 0x7f8705686e00 (LWP 11039) "gimp-2.10"   __libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
    2    Thread 0x7f8704735700 (LWP 11040) "gmain"       0x00007f870850c6d9 in __GI___poll (fds=0x5628975f2a50, nfds=2, timeout=3997) at ../sysdeps/unix/sysv/linux/poll.c:29
    3    Thread 0x7f87023cf700 (LWP 11041) "gdbus"       0x00007f870850c6d9 in __GI___poll (fds=0x5628975c9930, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
    4    Thread 0x7f86ed48c700 (LWP 11042) "async"       syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
    5    Thread 0x7f86ecc8b700 (LWP 11043) "worker"      syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
    6    Thread 0x7f86e6317700 (LWP 11058) "swap writer" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
    7    Thread 0x7f86e7fff700 (LWP 11139) "pool"        syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38

  Thread 7 (Thread 0x7f86e7fff700 (LWP 11139)):
  #0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  #1  0x00007f870882a75a in g_cond_wait_until () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x00007f87087b6061 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #3  0x00007f87087b6621 in g_async_queue_timeout_pop () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f870880cb71 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #5  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #6  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217394657024, 546695890381745290, 140726349083406, 140726349083407, 140726349083536, 140217394653440, -532674918553310070, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #7  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 6 (Thread 0x7f86e6317700 (LWP 11058)):
  #0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  #1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x00007f8709299375 in  () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
  #3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217364346624, 546695890381745290, 140726349086222, 140726349086223, 140726349086352, 140217364343040, -532676658015064950, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 5 (Thread 0x7f86ecc8b700 (LWP 11043)):
  #0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  #1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x0000562896133673 in  ()
  #3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217474922240, 546695890381745290, 140726349091598, 140726349091599, 140726349091728, 140217474918656, -532664363671180150, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 4 (Thread 0x7f86ed48c700 (LWP 11042)):
  #0  0x00007f8708512219 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  #1  0x00007f870882a63f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x000056289613348a in  ()
  #3  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217483314944, 546695890381745290, 140726349091614, 140726349091615, 140726349091744, 140217483311360, -532661064599425910, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #5  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 3 (Thread 0x7f87023cf700 (LWP 11041)):
  #0  0x00007f870850c6d9 in __GI___poll (fds=0x5628975c9930, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
          resultvar = 18446744073709551100
          sc_cancel_oldtype = 0
  #1  0x00007f87087e3e46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x00007f87087e41d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #3  0x00007f870915f7b6 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
  #4  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #5  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217834862336, 546695890381745290, 140726349091710, 140726349091711, 140726349091840, 140217834858752, -533600148998148982, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #6  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 2 (Thread 0x7f8704735700 (LWP 11040)):
  #0  0x00007f870850c6d9 in __GI___poll (fds=0x5628975f2a50, nfds=2, timeout=3997) at ../sysdeps/unix/sysv/linux/poll.c:29
          resultvar = 18446744073709551100
          sc_cancel_oldtype = 0
  #1  0x00007f87087e3e46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x00007f87087e3f6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #3  0x00007f87087e3fb1 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f870880c135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #5  0x00007f87085f0164 in start_thread (arg=<optimized out>) at pthread_create.c:486
          ret = <optimized out>
          pd = <optimized out>
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140217871980288, 546695890381745290, 140726349091310, 140726349091311, 140726349091440, 140217871976704, -533595318233682806, -533586696395117430}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
  #6  0x00007f8708518def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Thread 1 (Thread 0x7f8705686e00 (LWP 11039)):
  #0  0x00007f87085f9c24 in __libc_read (fd=14, buf=0x7ffd680c4910, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:26
          resultvar = 18446744073709551104
          sc_cancel_oldtype = 1
          sc_ret = <optimized out>
          nbytes = 256
          fd = 14
          buf = 0x7ffd680c4910
  #1  0x00007f870986e7d4 in gimp_stack_trace_print () at /usr/lib/libgimpbase-2.0.so.0
  #2  0x0000562895e712a0 in  ()
  #3  0x0000562895e716d8 in  ()
  #4  0x0000562895e71e37 in  ()
  #5  0x00007f87085fadd0 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0
  #6  0x00007f870843f077 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
          set = {__val = {0, 94732404675696, 140217957927312, 140217936274223, 4222451712, 94732404675696, 94732404675797, 94732404675696, 94732404675696, 94732404675799, 94732404675996, 94732404675696, 94732404675996, 0, 0, 0}}
          pid = <optimized out>
          tid = <optimized out>
  #7  0x00007f8708420535 in __GI_abort () at abort.c:79
          save_stage = 1
          act = {__sigaction_handler = {sa_handler = 0x56289b2526d0, sa_sigaction = 0x56289b2526d0}, sa_mask = {__val = {0, 7, 6, 0, 0, 0, 140726349091400, 21474836480, 140726349091248, 140217937494624, 140217937479768, 0, 3780789113705692160, 140217937464570, 0, 140217937479768}}, sa_flags = 137803379, sa_restorer = 0x7f870836b808}
          sigs = {__val = {32, 0 <repeats 15 times>}}
  #8  0x00007f870842040f in __assert_fail_base (fmt=0x7f87085ac858 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f870836b808 "!xcb_xlib_threads_sequence_lost", file=0x7f870836b673 "../../src/xcb_io.c", line=263, function=<optimized out>) at assert.c:92
          str = 0x56289b2526d0 "\360\262\227\233(V"
          total = 4096
  #9  0x00007f8708430142 in __GI___assert_fail (assertion=0x7f870836b808 "!xcb_xlib_threads_sequence_lost", file=0x7f870836b673 "../../src/xcb_io.c", line=263, function=0x7f870836bac0 "poll_for_event") at assert.c:101
  #10 0x00007f87082f95db in  () at /usr/lib/x86_64-linux-gnu/libX11.so.6
  #11 0x00007f87082f9680 in  () at /usr/lib/x86_64-linux-gnu/libX11.so.6
  #12 0x00007f87082f997d in _XEventsQueued () at /usr/lib/x86_64-linux-gnu/libX11.so.6
  #13 0x00007f87082eb6d7 in XPending () at /usr/lib/x86_64-linux-gnu/libX11.so.6
  #14 0x00007f870992c9f5 in  () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
  #15 0x00007f87087e3821 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #16 0x00007f87087e3df0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #17 0x00007f87087e41d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #18 0x0000562895e70acf in app_run ()
  #19 0x0000562895e703d5 in main ()
  [Inferior 1 (process 11039) detached]

  ```

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Follow ups

[Bug 1807355] Re: Crash During Using Centering Tool or Layers
From: Erich Eickmeyer, 2019-08-20