Ok, so what? What were you doing at the time? Is it reproducible? Is it a packaging problem?

I dont know what to do. What should I do ?

As per https://wiki.archlinux.org/index.php/Reporting_Bug_Guidelines unless it is a packaging issue report it upstream.

I get this same crash. I opened an JPEG image that is 1620x2160 and I was trying out different filters. Some filters I would undo via CTRL+Z. After doing this repeatedly, Gimp crashed with the information below.

GNU Image Manipulation Program version 2.10.2
git-describe: GIMP_2_10_0-292-gbe7f9b433a
C compiler:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --enable-libmpx --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib --disable-werror --enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.1.1 20180531 (GCC)

using GEGL version 0.4.3 (compiled against version 0.4.3)
using GLib version 2.56.1 (compiled against version 2.56.1)
using GdkPixbuf version 2.36.12 (compiled against version 2.36.12)
using GTK+ version 2.24.32 (compiled against version 2.24.32)
using Pango version 1.42.1 (compiled against version 1.42.1)
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: Segmentation fault

Stack trace:
/usr/lib/libgimpbase-2.0.so.0(gimp_stack_trace_print+0x3f8)[0x7f3a709bb758]
gimp-2.10(+0xc2d40)[0x56226f60fd40]
gimp-2.10(+0xc3198)[0x56226f610198]
gimp-2.10(+0xc3909)[0x56226f610909]
/usr/lib/libpthread.so.0(+0x11a80)[0x7f3a6ce4fa80]
/usr/lib/libgegl-0.4.so.0(gegl_buffer_cl_cache_flush+0x73)[0x7f3a6ebfa653]
/usr/lib/libgegl-0.4.so.0(gegl_sampler_get+0x9f)[0x7f3a6ebfd18f]
/usr/lib/gegl-0.4/gegl-common.so(+0x5f731)[0x7f3a4a44b731]
/usr/lib/libgegl-0.4.so.0(+0x62efd)[0x7f3a6ec18efd]
/usr/lib/libglib-2.0.so.0(+0x75463)[0x7f3a6d466463]
/usr/lib/libglib-2.0.so.0(+0x74a2a)[0x7f3a6d465a2a]
/usr/lib/libpthread.so.0(+0x7075)[0x7f3a6ce45075]
/usr/lib/libc.so.6(clone+0x3f)[0x7f3a6cb7a53f]

I've exactly the same problem. Gimp is very unstable and crash regularly. Need to downgrade to 2.8

my environment : Archlinux up to date, openbox as window manager

A log I found in ~/.config/GIMP/2.10/CrashLog
/usr/lib/libgimpbase-2.0.so.0(gimp_stack_trace_print+0x3f8)[0x7fb20f891758]
gimp(+0xc2d40)[0x55ff80c33d40]
gimp(+0xc3198)[0x55ff80c34198]
gimp(+0xc3909)[0x55ff80c34909]
/usr/lib/libpthread.so.0(+0x11a80)[0x7fb20bd25a80]
/usr/lib/libc.so.6(gsignal+0x10b)[0x7fb20b98e86b]
/usr/lib/libc.so.6(abort+0x129)[0x7fb20b97940e]
/usr/lib/libc.so.6(+0x212e0)[0x7fb20b9792e0]
/usr/lib/libc.so.6(+0x2f112)[0x7fb20b987112]
/usr/lib/libX11.so.6(+0x41c3a)[0x7fb20b01bc3a]
/usr/lib/libX11.so.6(+0x41ceb)[0x7fb20b01bceb]
/usr/lib/libX11.so.6(_XEventsQueued+0x5d)[0x7fb20b01bfdd]
/usr/lib/libX11.so.6(XFlush+0x1a)[0x7fb20affe37a]
gimp(gimp_displays_set_busy+0x73)[0x55ff80d163a3]
gimp(+0xc759a)[0x55ff80c3859a]
gimp(+0x2d5e1f)[0x55ff80e46e1f]
gimp(+0x36ee8f)[0x55ff80edfe8f]
gimp(gimp_procedure_execute+0x337)[0x55ff80ed34e7]
gimp(gimp_pdb_execute_procedure_by_name_args+0x20a)[0x55ff80ecc69a]
gimp(gimp_pdb_execute_procedure_by_name+0x3db)[0x55ff80eccb6b]
gimp(+0xc2c7e)[0x55ff80c33c7e]
gimp(+0xc3198)[0x55ff80c34198]
gimp(+0xc3909)[0x55ff80c34909]
/usr/lib/libpthread.so.0(+0x11a80)[0x7fb20bd25a80]
/usr/lib/libc.so.6(gsignal+0x10b)[0x7fb20b98e86b]
/usr/lib/libc.so.6(abort+0x129)[0x7fb20b97940e]
/usr/lib/libc.so.6(+0x212e0)[0x7fb20b9792e0]
/usr/lib/libc.so.6(+0x2f112)[0x7fb20b987112]
/usr/lib/libX11.so.6(+0x41c3a)[0x7fb20b01bc3a]
/usr/lib/libX11.so.6(+0x41ceb)[0x7fb20b01bceb]
/usr/lib/libX11.so.6(_XEventsQueued+0x5d)[0x7fb20b01bfdd]
/usr/lib/libX11.so.6(XPending+0x57)[0x7fb20b00dca7]
/usr/lib/libgdk-x11-2.0.so.0(+0x56d27)[0x7fb20e908d27]
/usr/lib/libglib-2.0.so.0(g_main_context_check+0x202)[0x7fb20c312f22]
/usr/lib/libglib-2.0.so.0(+0x4c4c6)[0x7fb20c3134c6]
/usr/lib/libglib-2.0.so.0(g_main_loop_run+0xd2)[0x7fb20c3138e2]
gimp(app_run+0x36f)[0x55ff80c3352f]
gimp(main+0x3b1)[0x55ff80c32df1]
/usr/lib/libc.so.6(__libc_start_main+0xeb)[0x7fb20b97b06b]
gimp(_start+0x2a)[0x55ff80c32f8a]

Does this crash still occur with the current Gimp Version (>=2.10.12) in the repositories?

Possible duplicate of:  FS#59140  - [gimp] Crash when image edition