Gimp crashed randomly while using the stamp tool

[decimus]

Not sure how helpful this will be, but GIMP instructed me to do these steps when it crashed. So here is the bug report.

I was using the stamp tool on a relatively small (~800x1200 px) JPG image (without having added a transparency channel, if that is relevant). It worked for some time without any issue, until suddenly GIMP crashed on me.

My system as per `lsb_release -rd`:

```
Description: Ubuntu 19.04
Release: 19.04
```

GIMP was installed from the latest available 19.04 package.

Bug information as supplied in the GIMP crash dialog:

```
GNU Image Manipulation Program version 2.10.8
git-describe: GIMP_2_10_6-294-ga967e8d2c2
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 8.2.0-13ubuntu1' --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 --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 8.2.0-13ubuntu1)

using GEGL version 0.4.14 (compiled against version 0.4.12)
using GLib version 2.60.4 (compiled against version 2.58.1)
using GdkPixbuf version 2.38.1 (compiled against version 2.38.0)
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 2.13.1 (compiled against version 2.13.0)
using Cairo version 1.16.0 (compiled against version 1.16.0)

```
> fatal error: Aborted

Stack trace:
```

# Stack traces obtained from PID 25593 - Thread 25593 #

[New LWP 25595]
[New LWP 25596]
[New LWP 25597]
[New LWP 25598]
[New LWP 25599]
[New LWP 25602]
[New LWP 25603]
[New LWP 25604]
[New LWP 25605]
[New LWP 25681]
[New LWP 5641]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
__libc_read (nbytes=256, buf=0x7ffc2f6673d0, fd=18) at ../sysdeps/unix/sysv/linux/read.c:26
  Id Target Id Frame
* 1 Thread 0x7fc053dffe00 (LWP 25593) "gimp" __libc_read (nbytes=256, buf=0x7ffc2f6673d0, fd=18) at ../sysdeps/unix/sysv/linux/read.c:26
  2 Thread 0x7fc053659700 (LWP 25595) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  3 Thread 0x7fc052e58700 (LWP 25596) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  4 Thread 0x7fc052657700 (LWP 25597) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  5 Thread 0x7fc0508a3700 (LWP 25598) "gmain" 0x00007fc055ae9729 in __GI___poll (fds=0x5585cc812710, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  6 Thread 0x7fc04be12700 (LWP 25599) "gdbus" 0x00007fc055ae9729 in __GI___poll (fds=0x5585cc82af10, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
  7 Thread 0x7fc035305700 (LWP 25602) "async" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  8 Thread 0x7fc034b04700 (LWP 25603) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  9 Thread 0x7fc02ffff700 (LWP 25604) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  10 Thread 0x7fc02f7fe700 (LWP 25605) "worker" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  11 Thread 0x7fc0137fe700 (LWP 25681) "swap writer" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  12 Thread 0x7fc0117fa700 (LWP 5641) "paint" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38

Thread 12 (Thread 0x7fc0117fa700 (LWP 5641)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00005585cb17ecdd in ()
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140462904026880, 1296702549451824165, 140721103729438, 140721103729439, 140721103729584, 140462904023296, -1261303775827895259, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fc0137fe700 (LWP 25681)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc05627a799 in () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140462937597696, 1296702549451824165, 140721103722174, 140721103722175, 140721103722320, 140462937594112, -1261299375633900507, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fc02f7fe700 (LWP 25605)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00005585cb3b1423 in ()
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140463407359744, 1296702549451824165, 140721103732078, 140721103732079, 140721103732224, 140463407356160, -1261413724843189211, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fc02ffff700 (LWP 25604)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00005585cb3b1423 in ()
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140463415752448, 1296702549451824165, 140721103732078, 140721103732079, 140721103732224, 140463415748864, -1261412623720948699, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fc034b04700 (LWP 25603)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00005585cb3b1423 in ()
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140463494416128, 1296702549451824165, 140721103732078, 140721103732079, 140721103732224, 140463494412544, -1261366915068371931, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fc035305700 (LWP 25602)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00005585cb3b166c in ()
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140463502808832, 1296702549451824165, 140721103732094, 140721103732095, 140721103732240, 140463502805248, -1261365813946131419, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fc04be12700 (LWP 25599)):
#0 0x00007fc055ae9729 in __GI___poll (fds=0x5585cc82af10, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1 0x00007fc055d88bf6 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc055d88f82 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007fc056156e26 in () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007fc055bce182 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 = {140463883495168, 1296702549451824165, 140721103732190, 140721103732191, 140721103732336, 140463883491584, -1261491839560885211, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fc0508a3700 (LWP 25598)):
#0 0x00007fc055ae9729 in __GI___poll (fds=0x5585cc812710, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1 0x00007fc055d88bf6 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc055d88d1c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007fc055d88d61 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007fc055bce182 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 = {140463961683712, 1296702549451824165, 140721103731774, 140721103731775, 140721103731920, 140463961680128, -1261446543225168859, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fc052657700 (LWP 25597)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc05623e993 in () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140463992829696, 1296702549451824165, 140721103732110, 140721103732111, 140721103732256, 140463992826112, -1261442392139277275, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc052e58700 (LWP 25596)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc05623e993 in () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140464001222400, 1296702549451824165, 140721103732110, 140721103732111, 140721103732256, 140464001218816, -1261441293164520411, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc053659700 (LWP 25595)):
#0 0x00007fc055aef2e9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007fc055dd393f in g_cond_wait () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fc05623e993 in () at /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0
#3 0x00007fc055db187d in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007fc055bce182 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 = {140464009615104, 1296702549451824165, 140721103732110, 140721103732111, 140721103732256, 140464009611520, -1261440200632214491, -1261435189256037339}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5 0x00007fc055af5b1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc053dffe00 (LWP 25593)):
#0 0x00007fc055bd7d94 in __libc_read (nbytes=256, buf=0x7ffc2f6673d0, fd=18) at ../sysdeps/unix/sysv/linux/read.c:26
        resultvar = 18446744073709551104
        sc_cancel_oldtype = 1
        sc_ret = <optimized out>
#1 0x00007fc055bd7d94 in __libc_read (fd=18, buf=0x7ffc2f6673d0, nbytes=256) at ../sysdeps/unix/sysv/linux/read.c:24
#2 0x00007fc0566ab7d4 in gimp_stack_trace_print () at /usr/lib/libgimpbase-2.0.so.0
#3 0x00005585cb0ec4a0 in ()
#4 0x00005585cb0ec8d8 in ()
#5 0x00005585cb0ed037 in ()
#6 0x00007fc055bd8f40 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0
#7 0x00007fc055a1bed7 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 140464047403288, 4222451712, 94033294510080, 94033294510080, 94033294510080, 94033294510080, 94033294510178, 94033294510180, 94033294510080, 94033294510180, 0, 0, 0, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
#8 0x00007fc0559fd535 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x5585d51dc800, sa_sigaction = 0x5585d51dc800}, sa_mask = {__val = {0, 140464048819264, 0, 0, 0, 0, 21474836480, 140721103731848, 140721103731696, 140464048632048, 140464048616840, 0, 17662399942666682880, 140464048601575, 0, 140464048616840}}, sa_flags = 1435793011, sa_restorer = 0x7fc055947808}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#9 0x00007fc0559fd40f in __assert_fail_base (fmt=0x7fc055b8b588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7fc055947808 "!xcb_xlib_threads_sequence_lost", file=0x7fc055947673 "../../src/xcb_io.c", line=263, function=<optimized out>) at assert.c:92
        str = 0x5585d51dc800 "`$CՅU"
        total = 4096
#10 0x00007fc055a0d012 in __GI___assert_fail (assertion=0x7fc055947808 "!xcb_xlib_threads_sequence_lost", file=0x7fc055947673 "../../src/xcb_io.c", line=263, function=0x7fc055947ac0 "poll_for_event") at assert.c:101
#11 0x00007fc0558d55db in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#12 0x00007fc0558d5680 in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#13 0x00007fc0558d597d in _XEventsQueued () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#14 0x00007fc0558c76d7 in XPending () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#15 0x00007fc0567689f5 in () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#16 0x00007fc055d885d1 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007fc055d88ba0 in () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007fc055d88f82 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00005585cb0ebcb7 in app_run ()
#20 0x00005585cb0eb5b5 in main ()
[Inferior 1 (process 25593) detached]

```