this is darktable 3.2.1 reporting a segfault: warning: Currently logging to /tmp/darktable_bt_I6ZMR0.txt. Turn the logging off and on to make the new setting effective. #0 0x00007ff64b629eef in wait4 () at /usr/lib/libc.so.6 #1 0x00007ff64b854b22 in () at /usr/lib/libdarktable.so #2 0x00007ff64b59a6a0 in () at /usr/lib/libc.so.6 #3 0x00007ff60ea4c217 in () at /usr/lib/libigc.so.1 #4 0x00007ff60ea4da2a in () at /usr/lib/libigc.so.1 #5 0x00007ff60e9edc00 in () at /usr/lib/libigc.so.1 #6 0x00007ff60e9ede5b in () at /usr/lib/libigc.so.1 #7 0x00007ff60e8d8c10 in () at /usr/lib/libigc.so.1 #8 0x00007ff60e96e3e8 in () at /usr/lib/libigc.so.1 #9 0x00007ff60e7fd934 in () at /usr/lib/libigc.so.1 #10 0x00007ff60e85114f in () at /usr/lib/libigc.so.1 #11 0x00007ff62f7005d8 in llvm::FPPassManager::runOnFunction(llvm::Function&) () at /usr/lib/libLLVM-10.so #12 0x00007ff62f701bdd in llvm::FPPassManager::runOnModule(llvm::Module&) () at /usr/lib/libLLVM-10.so #13 0x00007ff62f701f70 in llvm::legacy::PassManagerImpl::run(llvm::Module&) () at /usr/lib/libLLVM-10.so #14 0x00007ff60e699dd4 in () at /usr/lib/libigc.so.1 #15 0x00007ff60e673061 in () at /usr/lib/libigc.so.1 #16 0x00007ff60e558994 in () at /usr/lib/libigc.so.1 #17 0x00007ff60e60bbba in () at /usr/lib/libigc.so.1 #18 0x00007ff64319d2ea in () at /usr/lib/intel-opencl/libigdrcl.so #19 0x00007ff642fa0d50 in () at /usr/lib/intel-opencl/libigdrcl.so #20 0x00007ff642f38a02 in () at /usr/lib/intel-opencl/libigdrcl.so #21 0x00007ff64346710e in clBuildProgram () at /usr/lib/libOpenCL.so #22 0x00007ff64b839e48 in dt_opencl_build_program () at /usr/lib/libdarktable.so #23 0x00007ff64b83b2b3 in () at /usr/lib/libdarktable.so #24 0x00007ff64b83f0c0 in dt_opencl_init () at /usr/lib/libdarktable.so #25 0x00007ff64b7bb1ed in dt_init () at /usr/lib/libdarktable.so #26 0x00005648386de0e0 in () #27 0x00007ff64b585152 in __libc_start_main () at /usr/lib/libc.so.6 #28 0x00005648386de13e in () ========= Id Target Id Frame * 1 Thread 0x7ff644a66180 (LWP 2669) "darktable-cltes" 0x00007ff64b629eef in wait4 () from /usr/lib/libc.so.6 2 Thread 0x7ff6444b2640 (LWP 2670) "gmain" 0x00007ff64b65246f in poll () from /usr/lib/libc.so.6 3 Thread 0x7ff643cb1640 (LWP 2671) "gdbus" 0x00007ff64b65246f in poll () from /usr/lib/libc.so.6 4 Thread 0x7ff640f8f640 (LWP 2680) "darktable-cltes" 0x00007ff64b54a6a2 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 ========= Thread 4 (Thread 0x7ff640f8f640 (LWP 2680)): #0 0x00007ff64b54a6a2 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007ff648c12c11 in __gthread_cond_wait (__mutex=, __cond=) at /build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:865 __e = #2 std::condition_variable::wait(std::unique_lock&) (this=, __lock=...) at /build/gcc/src/gcc/libstdc++-v3/src/c++11/condition_variable.cc:53 __e = #3 0x00007ff64325020e in () at /usr/lib/intel-opencl/libigdrcl.so #4 0x00007ff64b5443e9 in start_thread () at /usr/lib/libpthread.so.0 #5 0x00007ff64b65d293 in clone () at /usr/lib/libc.so.6 Thread 3 (Thread 0x7ff643cb1640 (LWP 2671)): #0 0x00007ff64b65246f in poll () at /usr/lib/libc.so.6 #1 0x00007ff64b328188 in () at /usr/lib/libglib-2.0.so.0 #2 0x00007ff64b2d6163 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0 #3 0x00007ff64a753fe8 in () at /usr/lib/libgio-2.0.so.0 #4 0x00007ff64b303a91 in () at /usr/lib/libglib-2.0.so.0 #5 0x00007ff64b5443e9 in start_thread () at /usr/lib/libpthread.so.0 #6 0x00007ff64b65d293 in clone () at /usr/lib/libc.so.6 Thread 2 (Thread 0x7ff6444b2640 (LWP 2670)): #0 0x00007ff64b65246f in poll () at /usr/lib/libc.so.6 #1 0x00007ff64b328188 in () at /usr/lib/libglib-2.0.so.0 #2 0x00007ff64b2d5421 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0 #3 0x00007ff64b2d5472 in () at /usr/lib/libglib-2.0.so.0 #4 0x00007ff64b303a91 in () at /usr/lib/libglib-2.0.so.0 #5 0x00007ff64b5443e9 in start_thread () at /usr/lib/libpthread.so.0 #6 0x00007ff64b65d293 in clone () at /usr/lib/libc.so.6 Thread 1 (Thread 0x7ff644a66180 (LWP 2669)): #0 0x00007ff64b629eef in wait4 () at /usr/lib/libc.so.6 #1 0x00007ff64b854b22 in () at /usr/lib/libdarktable.so #2 0x00007ff64b59a6a0 in () at /usr/lib/libc.so.6 #3 0x00007ff60ea4c217 in () at /usr/lib/libigc.so.1 #4 0x00007ff60ea4da2a in () at /usr/lib/libigc.so.1 #5 0x00007ff60e9edc00 in () at /usr/lib/libigc.so.1 #6 0x00007ff60e9ede5b in () at /usr/lib/libigc.so.1 #7 0x00007ff60e8d8c10 in () at /usr/lib/libigc.so.1 #8 0x00007ff60e96e3e8 in () at /usr/lib/libigc.so.1 #9 0x00007ff60e7fd934 in () at /usr/lib/libigc.so.1 #10 0x00007ff60e85114f in () at /usr/lib/libigc.so.1 #11 0x00007ff62f7005d8 in llvm::FPPassManager::runOnFunction(llvm::Function&) () at /usr/lib/libLLVM-10.so #12 0x00007ff62f701bdd in llvm::FPPassManager::runOnModule(llvm::Module&) () at /usr/lib/libLLVM-10.so #13 0x00007ff62f701f70 in llvm::legacy::PassManagerImpl::run(llvm::Module&) () at /usr/lib/libLLVM-10.so #14 0x00007ff60e699dd4 in () at /usr/lib/libigc.so.1 #15 0x00007ff60e673061 in () at /usr/lib/libigc.so.1 #16 0x00007ff60e558994 in () at /usr/lib/libigc.so.1 #17 0x00007ff60e60bbba in () at /usr/lib/libigc.so.1 #18 0x00007ff64319d2ea in () at /usr/lib/intel-opencl/libigdrcl.so #19 0x00007ff642fa0d50 in () at /usr/lib/intel-opencl/libigdrcl.so #20 0x00007ff642f38a02 in () at /usr/lib/intel-opencl/libigdrcl.so #21 0x00007ff64346710e in clBuildProgram () at /usr/lib/libOpenCL.so #22 0x00007ff64b839e48 in dt_opencl_build_program () at /usr/lib/libdarktable.so #23 0x00007ff64b83b2b3 in () at /usr/lib/libdarktable.so #24 0x00007ff64b83f0c0 in dt_opencl_init () at /usr/lib/libdarktable.so #25 0x00007ff64b7bb1ed in dt_init () at /usr/lib/libdarktable.so #26 0x00005648386de0e0 in () #27 0x00007ff64b585152 in __libc_start_main () at /usr/lib/libc.so.6 #28 0x00005648386de13e in () [Inferior 1 (process 2669) detached]