| "make update-download -j4" exit with 0. |
| "make update-src -j4" exit with 0. |
| "make after-update -j4" exit with 0. |
| "make miniruby -j4" exit with 0. |
| "make ruby -j4" exit with 0. |
| "make all -j4" exit with 0. |
| "make install -j4" exit with 0. |
| make yes-btest TESTOPTS='-q -j4' |
| $$$ #<Timeout::Error: execution expired> |
| ### enter analyzing mode for stuck processes |
| $$$ ps jx |
| PPID PID PGID SID TTY TPGID STAT UID TIME COMMAND |
| 11 12 12 12 ? -1 Ss 1001 0:05 sh build-loop.sh trunk-yjit --incremental --process-num=4 |
| 12 335442 12 12 ? -1 Sl 1001 0:00 ruby ./br.rb build_report trunk-yjit --incremental --process-num=4 |
| 335442 335445 12 12 ? -1 Sl 1001 0:00 ruby /home/ko1/build-ruby/build-ruby.rb --target_name=trunk-yjit --logfile=/home/ko1/ruby/logs/brlog.trunk-yjit.20250915-080852 --root_dir=/tmp/ruby --timeout=10800 --configure_opts=cppflags=-DYJIT_FORCE_ENABLE --incremental --process-num=4 |
| 335445 336444 12 12 ? -1 S 1001 0:00 sh -c make yes-btest TESTOPTS='-q -j4' |
| 336444 336445 12 12 ? -1 S 1001 0:00 make yes-btest TESTOPTS=-q -j4 |
| 336445 336461 12 12 ? -1 Sl 1001 0:05 /usr/bin/ruby --disable=gems /tmp/ruby/src/trunk-yjit/bootstraptest/runner.rb --ruby=./miniruby -I/tmp/ruby/src/trunk-yjit/lib -I. -I.ext/common -r./x86_64-linux-fake --disable-gems -q -j4 |
| 336461 336867 12 12 ? -1 Z 1001 0:00 [miniruby] <defunct> |
| 1 336882 12 12 ? -1 Sl 1001 0:00 /tmp/ruby/build/trunk-yjit/miniruby -I/tmp/ruby/src/trunk-yjit/lib -I/tmp/ruby/build/trunk-yjit -I/tmp/ruby/build/trunk-yjit/.ext/common -r/tmp/ruby/build/trunk-yjit/x86_64-linux-fake --disable-gems -W0 bootstraptest.test_ractor.rb_2145_1392.rb |
| 335445 376204 12 12 ? -1 R 1001 0:00 ps jx |
| 1 1144187 12 12 ? -1 Sl 1001 0:00 /tmp/ruby/src/trunk-yjit/tool/lib/test/unit/parallel.rb: TestIOBuffer#test_shared |
| {11=>[12], 12=>[335442], 335442=>[335445], 335445=>[336444, 376204], 336444=>[336445], 336445=>[336461], 336461=>[336867], 1=>[336882, 1144187]} |
| $ timeout 60 gdb -p 336867 -x /home/ko1/build-ruby/gdbscript -batch -quiet 2> /dev/null |
| Could not attach to process. If your uid matches the uid of the target |
| process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try |
| again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf |
| >>> Threads |
| No threads. |
| >>> Machine level backtrace |
| >>> Dump Ruby level backtrace (if possible) |
| $ timeout 60 gdb -p 336461 -x /home/ko1/build-ruby/gdbscript -batch -quiet 2> /dev/null |
| [New LWP 336538] |
| [New LWP 336479] |
| [New LWP 336464] |
| [Thread debugging using libthread_db enabled] |
| Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". |
| 0x00007689b95d9a00 in __GI_ppoll (fds=0x7ffc8bc8dc88, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:42 |
| >>> Threads |
| Id Target Id Frame |
| * 1 Thread 0x7689b94bb740 (LWP 336461) "ruby" 0x00007689b95d9a00 in __GI_ppoll (fds=0x7ffc8bc8dc88, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:42 |
| 2 Thread 0x7689b28d76c0 (LWP 336538) "runner.rb:638" 0x00007689b95d94cd in __GI___poll (fds=0x7689b27d6180, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 |
| 3 Thread 0x7689b2ad86c0 (LWP 336479) "runner.rb:546" 0x00007689b95d94cd in __GI___poll (fds=0x7689b29d7180, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 |
| 4 Thread 0x7689b459c6c0 (LWP 336464) "runner.rb:334" 0x00007689b9556d61 in __futex_abstimed_wait_common64 (private=30345, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x57d0de0a3d9c) at ./nptl/futex-internal.c:57 |
| >>> Machine level backtrace |
| Thread 4 (Thread 0x7689b459c6c0 (LWP 336464) "runner.rb:334"): |
| #0 0x00007689b9556d61 in __futex_abstimed_wait_common64 (private=30345, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x57d0de0a3d9c) at ./nptl/futex-internal.c:57 |
| sc_cancel_oldtype = 0 |
| sc_ret = <optimized out> |
| resultvar = <optimized out> |
| __arg6 = <optimized out> |
| __arg5 = <optimized out> |
| __arg4 = <optimized out> |
| __arg3 = <optimized out> |
| __arg2 = <optimized out> |
| __arg1 = <optimized out> |
| _a6 = <optimized out> |
| _a5 = <optimized out> |
| _a4 = <optimized out> |
| _a3 = <optimized out> |
| _a2 = <optimized out> |
| _a1 = <optimized out> |
| #1 __futex_abstimed_wait_common (cancel=true, private=30345, abstime=0x0, clockid=0, expected=0, futex_word=0x57d0de0a3d9c) at ./nptl/futex-internal.c:87 |
| err = <optimized out> |
| clockbit = 256 |
| op = 393 |
| err = <optimized out> |
| clockbit = <optimized out> |
| op = <optimized out> |
| #2 __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x57d0de0a3d9c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139 |
| No locals. |
| #3 0x00007689b95597dd in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x57d0de096f90, cond=0x57d0de0a3d70) at ./nptl/pthread_cond_wait.c:503 |
| spin = 0 |
| buffer = {__routine = 0x7689b95594a0 <__condvar_cleanup_waiting>, __arg = 0x7689b449b370, __canceltype = -1262231604, __prev = 0x0} |
| cbuffer = {wseq = 157, cond = 0x57d0de0a3d70, mutex = 0x57d0de096f90, private = 0} |
| err = <optimized out> |
| g = 1 |
| flags = <optimized out> |
| g1_start = <optimized out> |
| maxspin = 0 |
| signals = <optimized out> |
| result = 0 |
| wseq = 157 |
| seq = 78 |
| private = 0 |
| maxspin = <optimized out> |
| err = <optimized out> |
| result = <optimized out> |
| wseq = <optimized out> |
| g = <optimized out> |
| seq = <optimized out> |
| flags = <optimized out> |
| private = <optimized out> |
| signals = <optimized out> |
| done = <optimized out> |
| g1_start = <optimized out> |
| spin = <optimized out> |
| buffer = <optimized out> |
| cbuffer = <optimized out> |
| s = <optimized out> |
| #4 ___pthread_cond_wait (cond=0x57d0de0a3d70, mutex=0x57d0de096f90) at ./nptl/pthread_cond_wait.c:627 |
| No locals. |
| #5 0x00007689b9aa4dcd in rb_native_cond_wait () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #6 0x00007689b9aa697c in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #7 0x00007689b9aa6a72 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #8 0x00007689b9aab87c in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #9 0x00007689b994c440 in rb_ensure () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #10 0x00007689b9aa1001 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #11 0x00007689b9aa10ab in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #12 0x00007689b9ae29d0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #13 0x00007689b9ae51df in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #14 0x00007689b9ae82a2 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #15 0x00007689b9aecc1a in rb_vm_exec () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #16 0x00007689b9af188e in rb_vm_invoke_proc () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #17 0x00007689b9aa9b4f in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #18 0x00007689b9aaa041 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #19 0x00007689b9aaa916 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #20 0x00007689b955aa94 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447 |
| ret = <optimized out> |
| pd = <optimized out> |
| out = <optimized out> |
| unwind_buf = {cancel_jmp_buf = {{jmp_buf = {130333808379584, 3015576970396973950, 130333808379584, -136, 22, 140722653678672, 3015576970409556862, 3015548486963051390}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} |
| not_first_call = <optimized out> |
| #21 0x00007689b95e7c3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78 |
| No locals. |
| Thread 3 (Thread 0x7689b2ad86c0 (LWP 336479) "runner.rb:546"): |
| #0 0x00007689b95d94cd in __GI___poll (fds=0x7689b29d7180, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 |
| sc_ret = -516 |
| sc_cancel_oldtype = 0 |
| sc_ret = <optimized out> |
| #1 0x00007689b997c63f in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #2 0x00007689b997d5d9 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #3 0x00007689b9aa9643 in rb_thread_io_blocking_region () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #4 0x00007689b997d9be in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #5 0x00007689b9982bf9 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #6 0x00007689b994c440 in rb_ensure () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #7 0x00007689b997e0f0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #8 0x00007689b99820f0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #9 0x00007689b9985626 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #10 0x00007689b9ae29d0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #11 0x00007689b9ae51df in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #12 0x00007689b9ae82a2 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #13 0x00007689b9aecc1a in rb_vm_exec () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #14 0x00007689b9af188e in rb_vm_invoke_proc () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #15 0x00007689b9aa9b4f in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #16 0x00007689b9aaa041 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #17 0x00007689b9aaa916 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #18 0x00007689b955aa94 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447 |
| ret = <optimized out> |
| pd = <optimized out> |
| out = <optimized out> |
| unwind_buf = {cancel_jmp_buf = {{jmp_buf = {130333780313792, 3015571917367950206, 130333780313792, -136, 22, 130333796069920, 3015571917380533118, 3015548486963051390}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} |
| not_first_call = <optimized out> |
| #19 0x00007689b95e7c3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78 |
| No locals. |
| Thread 2 (Thread 0x7689b28d76c0 (LWP 336538) "runner.rb:638"): |
| #0 0x00007689b95d94cd in __GI___poll (fds=0x7689b27d6180, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 |
| sc_ret = -516 |
| sc_cancel_oldtype = 0 |
| sc_ret = <optimized out> |
| #1 0x00007689b997c63f in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #2 0x00007689b997d5d9 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #3 0x00007689b9aa9643 in rb_thread_io_blocking_region () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #4 0x00007689b997d9be in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #5 0x00007689b9982bf9 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #6 0x00007689b994c440 in rb_ensure () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #7 0x00007689b997e0f0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #8 0x00007689b99820f0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #9 0x00007689b9985626 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #10 0x00007689b9ae29d0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #11 0x00007689b9ae51df in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #12 0x00007689b9ae82a2 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #13 0x00007689b9aecc1a in rb_vm_exec () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #14 0x00007689b9af188e in rb_vm_invoke_proc () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #15 0x00007689b9aa9b4f in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #16 0x00007689b9aaa041 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #17 0x00007689b9aaa916 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #18 0x00007689b955aa94 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447 |
| ret = <optimized out> |
| pd = <optimized out> |
| out = <optimized out> |
| unwind_buf = {cancel_jmp_buf = {{jmp_buf = {130333778212544, 3015572192782728062, 130333778212544, -136, 25, 130333800272416, 3015572192795310974, 3015548486963051390}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} |
| not_first_call = <optimized out> |
| #19 0x00007689b95e7c3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78 |
| No locals. |
| Thread 1 (Thread 0x7689b94bb740 (LWP 336461) "ruby"): |
| #0 0x00007689b95d9a00 in __GI_ppoll (fds=0x7ffc8bc8dc88, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:42 |
| sc_ret = -514 |
| sc_cancel_oldtype = 0 |
| sc_ret = <optimized out> |
| tval = {tv_sec = 140722653682752, tv_nsec = 96554588008984} |
| #1 0x00007689b9aa5ac9 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #2 0x00007689b9aa6b81 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #3 0x00007689b9aa93a2 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #4 0x00007689b9aaab45 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #5 0x00007689b994c440 in rb_ensure () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #6 0x00007689b9aa5f8b in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #7 0x00007689b9ae8508 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #8 0x00007689b9aecc1a in rb_vm_exec () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #9 0x00007689b9af1367 in rb_yield () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #10 0x00007689b994c440 in rb_ensure () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #11 0x00007689b992a2a6 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #12 0x00007689b9ae29d0 in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #13 0x00007689b9ae51df in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #14 0x00007689b9ae96bc in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #15 0x00007689b9aecc1a in rb_vm_exec () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #16 0x00007689b9949e5c in ?? () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #17 0x00007689b994e193 in ruby_run_node () from /lib/x86_64-linux-gnu/libruby-3.2.so.3.2 |
| No symbol table info available. |
| #18 0x000057d0ac014187 in ?? () |
| No symbol table info available. |
| #19 0x00007689b94e81ca in __libc_start_call_main (main=main@entry=0x57d0ac014120, argc=argc@entry=6, argv=argv@entry=0x7ffc8bc8eb58) at ../sysdeps/nptl/libc_start_call_main.h:58 |
| self = <optimized out> |
| result = <optimized out> |
| unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140722653686616, 4265758106742176638, 6, 0, 96553750588736, 130333899546624, 4265758106761051006, 3015548531193559934}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x6, 0x7ffc8bc8eb50}, data = {prev = 0x0, cleanup = 0x0, canceltype = 6}}} |
| not_first_call = <optimized out> |
| #20 0x00007689b94e828b in __libc_start_main_impl (main=0x57d0ac014120, argc=6, argv=0x7ffc8bc8eb58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc8bc8eb48) at ../csu/libc-start.c:360 |
| No locals. |
| #21 0x000057d0ac0141d5 in _start () |
| No symbol table info available. |
| >>> Dump Ruby level backtrace (if possible) |
| [Inferior 1 (process 336461) detached] |
| $ timeout 60 gdb -p 336445 -x /home/ko1/build-ruby/gdbscript -batch -quiet 2> /dev/null |
| make: *** [uncommon.mk:839: yes-btest] Killed |
| >>> Threads |
| No threads. |
| >>> Machine level backtrace |
| >>> Dump Ruby level backtrace (if possible) |
| #<Errno::ESRCH: No such process> |
| $ timeout 60 gdb -p 336444 -x /home/ko1/build-ruby/gdbscript -batch -quiet 2> /dev/null |
| Could not attach to process. If your uid matches the uid of the target |
| process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try |
| again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf |
| >>> Threads |
| No threads. |
| >>> Machine level backtrace |
| >>> Dump Ruby level backtrace (if possible) |
| $ timeout 60 gdb -p 376204 -x /home/ko1/build-ruby/gdbscript -batch -quiet 2> /dev/null |
| >>> Threads |
| No threads. |
| >>> Machine level backtrace |
| >>> Dump Ruby level backtrace (if possible) |
| #<Errno::ESRCH: No such process> |