Ruby

$ gdb --args ./miniruby -ve 'Signal.trap(:TERM) { print "2\r"; sleep 0.01; exit(0) }; spawn("sleep 0.1; kill -TERM #{$$}"); loop {print "1\r"}'

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Reading symbols from ./miniruby...

(gdb) r

Starting program: /home/wanabe/work/prog/ruby/ruby/tmp/master/miniruby -ve Signal.trap\(:TERM\)\ \{\ print\ \"2\\r\"\;\ sleep\ 0.01\;\ exit\(0\)\ \}\;\ spawn\(\"sleep\ 0.1\;\ kill\ -TERM\ \#\{\$\$\}\"\)\;\ loop\ \{print\ \"1\\r\"\}

This GDB supports auto-downloading debuginfo from the following URLs:

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Enable debuginfod for this session? (y or [n])

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To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

[New Thread 0x7fffde5ff6c0 (LWP 71356)]

ruby 4.1.0dev (2026-08-12T02:39:28Z origin/master c6e9858440) +PRISM [x86_64-linux]

[Detaching after vfork from child process 71357]

1

Thread 1 "miniruby" received signal SIGTERM, Terminated.

0x00007ffff7b1c6dd in __GI___libc_write (nbytes=2, buf=0x55555606e810, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26

warning: 26 ../sysdeps/unix/sysv/linux/write.c: No such file or directory

(gdb) b rb_raise

Breakpoint 1 at 0x5555556aad64: file ../../error.c, line 3930.

(gdb) c

Continuing.

Thread 1 "miniruby" hit Breakpoint 1, rb_raise (exc_class=93824993755556, fmt=0x7fffffff9710 "@\227\377\377\377\177") at ../../error.c:3930

3930 {

(gdb) bt

#0 rb_raise (exc_class=93824993755556, fmt=0x7fffffff9710 "@\227\377\377\377\177") at ../../error.c:3930

#1 0x0000555555895bf4 in do_mutex_lock (args=0x7fffffff9870, interruptible_p=1) at ../../thread_sync.c:296

#2 0x000055555589674a in rb_mutex_synchronize (self=140737345534480, func=0x555555700320 <io_binwrite_string>, arg=140737488328896) at ../../thread_sync.c:628

#3 0x00005555557005d5 in io_binwrite (ptr=0x55555606e8c0 "2\r", len=2, fptr=0x555555f26c40, nosync=0) at ../../io.c:1939

#4 0x0000555555700962 in io_fwrite (str=140737346561120, fptr=0x555555f26c40, nosync=0) at ../../io.c:2044

#5 0x0000555555700ad4 in io_write (io=140737344833152, str=140737346561120, nosync=0) at ../../io.c:2082

#6 0x000055555570145c in io_write_m (argc=1, argv=0x7fffffff9dd0, io=140737344833152) at ../../io.c:2333

#7 0x00005555558eb932 in ractor_safe_call_cfunc_m1 (recv=140737344833152, argc=1, argv=0x7fffffff9dd0, func=0x555555701405 <io_write_m>) at ../../vm_insnhelper.c:3667

#8 0x000055555590acd7 in vm_call0_cfunc_with_frame (ec=0x555555ebff58, calling=0x7fffffff9cb0, argv=0x7fffffff9dd0) at ../../vm_eval.c:164

#9 0x000055555590ae05 in vm_call0_cfunc (ec=0x555555ebff58, calling=0x7fffffff9cb0, argv=0x7fffffff9dd0) at ../../vm_eval.c:178

#10 0x000055555590b0cc in vm_call0_body (ec=0x555555ebff58, calling=0x7fffffff9cb0, argv=0x7fffffff9dd0) at ../../vm_eval.c:229

#11 0x000055555590a8bf in vm_call0_cc (ec=0x555555ebff58, recv=140737344833152, id=9361, argc=1, argv=0x7fffffff9dd0, cc=0x7ffff77cb9c0, kw_splat=0) at ../../vm_eval.c:101

#12 0x000055555590d89a in rb_funcallv_scope (recv=140737344833152, mid=9361, argc=1, argv=0x7fffffff9dd0, scope=CALL_FCALL) at ../../vm_eval.c:1070

#13 0x000055555590d91e in rb_funcallv (recv=140737344833152, mid=9361, argc=1, argv=0x7fffffff9dd0) at ../../vm_eval.c:1086

#14 0x0000555555701491 in rb_io_write (io=140737344833152, str=140737346561120) at ../../io.c:2340

#15 0x000055555570d5f6 in rb_io_print (argc=1, argv=0x7ffff78ff0e0, out=140737344833152) at ../../io.c:8793

#16 0x000055555570d67f in rb_f_print (argc=1, argv=0x7ffff78ff0e0, _=140737344831648) at ../../io.c:8854

#17 0x00005555558eb932 in ractor_safe_call_cfunc_m1 (recv=140737344831648, argc=1, argv=0x7ffff78ff0e0, func=0x55555570d64f <rb_f_print>) at ../../vm_insnhelper.c:3667

#18 0x00005555558ec572 in vm_call_cfunc_with_frame_ (ec=0x555555ebff58, reg_cfp=0x7ffff79fee88, calling=0x7fffffffb070, argc=1, argv=0x7ffff78ff0e0,

stack_bottom=0x7ffff78ff0d8) at ../../vm_insnhelper.c:3858

#19 0x00005555558ec7ec in vm_call_cfunc_with_frame (ec=0x555555ebff58, reg_cfp=0x7ffff79fee88, calling=0x7fffffffb070) at ../../vm_insnhelper.c:3904

--Type <RET> for more, q to quit, c to continue without paging--

#20 0x00005555558fcc43 in vm_sendish (method_explorer=mexp_search_method, block_handler=0, cd=0x555555fa1100, reg_cfp=0x7ffff79fee88, ec=0x555555ebff58)

at ../../vm_insnhelper.c:6172

#21 vm_exec_core (ec=0x555555ebff58) at ../../insns.def:909

#22 0x00005555559182a0 in rb_vm_exec (ec=0x555555ebff58) at ../../vm.c:2858

#23 0x0000555555915469 in invoke_iseq_block_from_c (me=0x0, is_lambda=0, cref=0x0, passed_block_handler=0, kw_splat=0, argv=0x7fffffffb778, argc=1, self=140737344831648,

captured=0x555555fa10d0, ec=0x555555ebff58) at ../../vm.c:1866

#24 invoke_block_from_c_proc (me=0x0, cref=0x0, is_lambda=0, passed_block_handler=0, kw_splat=0, argv=0x7fffffffb778, argc=1, self=140737344831648, proc=0x555555fa10d0,

ec=0x555555ebff58) at ../../vm.c:1968

#25 vm_invoke_proc (ec=0x555555ebff58, proc=0x555555fa10d0, self=140737344831648, argc=1, argv=0x7fffffffb778, kw_splat=0, passed_block_handler=0, cref=0x0)

at ../../vm.c:1999

#26 0x0000555555915bec in rb_vm_invoke_proc (ec=0x555555ebff58, proc=0x555555fa10d0, argc=1, argv=0x7fffffffb778, kw_splat=0, passed_block_handler=0, cref=0x0)

at ../../vm.c:2022

#27 0x000055555590b841 in vm_call0_body (ec=0x555555ebff58, calling=0x7fffffffb4f0, argv=0x7fffffffb778) at ../../vm_eval.c:293

#28 0x000055555590a8bf in vm_call0_cc (ec=0x555555ebff58, recv=140737345533960, id=3489, argc=1, argv=0x7fffffffb778, cc=0x7ffff78c6438, kw_splat=0) at ../../vm_eval.c:101

#29 0x000055555590c543 in rb_call0 (ec=0x555555ebff58, recv=140737345533960, mid=3489, argc=1, argv=0x7fffffffb778, call_scope=CALL_FCALL, self=140737344833152)

at ../../vm_eval.c:577

#30 0x000055555590d24f in rb_call (recv=140737345533960, mid=3489, argc=1, argv=0x7fffffffb778, scope=CALL_FCALL) at ../../vm_eval.c:896

#31 0x000055555590d96b in rb_funcallv_kw (recv=140737345533960, mid=3489, argc=1, argv=0x7fffffffb778, kw_splat=0) at ../../vm_eval.c:1094

#32 0x00005555559106d9 in rb_eval_cmd_call_kw (cmd=140737345533960, argc=1, argv=0x7fffffffb778, kw_splat=0) at ../../vm_eval.c:2196

#33 0x00005555558466ef in signal_exec (cmd=140737345533960, sig=15) at ../../signal.c:1081

#34 0x000055555584688a in rb_signal_exec (th=0x555555ea0780 <_main_thread>, sig=15) at ../../signal.c:1143

--Type <RET> for more, q to quit, c to continue without paging--

#35 0x000055555589d86e in rb_threadptr_execute_interrupts (th=0x555555ea0780 <_main_thread>, blocking_timing=1) at ../../thread.c:2820

#36 0x000055555588e5c7 in vm_check_ints_blocking (ec=0x555555ebff58) at ../../thread.c:228

#37 0x000055555589c8bf in rb_thread_io_blocking_call (io=0x555555f26c40, func=0x5555556ff0db <internal_write_func>, data1=0x7fffffffbac0, events=4) at ../../thread.c:2163

#38 0x00005555556fdf28 in rb_io_blocking_region_wait (io=0x555555f26c40, function=0x5555556ff0db <internal_write_func>, argument=0x7fffffffbac0, events=RUBY_IO_WRITABLE)

at ../../io.c:230

#39 0x00005555556ff54c in rb_io_write_memory (fptr=0x555555f26c40, buf=0x55555606e810, count=2) at ../../io.c:1360

#40 0x000055555570030a in io_binwrite_string_internal (fptr=0x555555f26c40, ptr=0x55555606e810 "1\r", length=2) at ../../io.c:1817

#41 0x0000555555700370 in io_binwrite_string (arg=140737488338256) at ../../io.c:1866

#42 0x00005555556b408c in rb_ec_ensure (ec_arg=0x555555ebff58, b_proc=0x555555700320 <io_binwrite_string>, data1=140737488338256,

e_proc_arg=0x555555896318 <do_mutex_unlock_safe>, data2_arg=140737488338176) at ../../eval.c:1171

#43 0x000055555589676c in rb_mutex_synchronize (self=140737345534480, func=0x555555700320 <io_binwrite_string>, arg=140737488338256) at ../../thread_sync.c:629

#44 0x00005555557005d5 in io_binwrite (ptr=0x55555606e810 "1\r", len=2, fptr=0x555555f26c40, nosync=0) at ../../io.c:1939

#45 0x0000555555700962 in io_fwrite (str=140737346561000, fptr=0x555555f26c40, nosync=0) at ../../io.c:2044

#46 0x0000555555700ad4 in io_write (io=140737344833152, str=140737346561000, nosync=0) at ../../io.c:2082

#47 0x000055555570145c in io_write_m (argc=1, argv=0x7fffffffc260, io=140737344833152) at ../../io.c:2333

#48 0x00005555558eb932 in ractor_safe_call_cfunc_m1 (recv=140737344833152, argc=1, argv=0x7fffffffc260, func=0x555555701405 <io_write_m>) at ../../vm_insnhelper.c:3667

#49 0x000055555590acd7 in vm_call0_cfunc_with_frame (ec=0x555555ebff58, calling=0x7fffffffc140, argv=0x7fffffffc260) at ../../vm_eval.c:164

#50 0x000055555590ae05 in vm_call0_cfunc (ec=0x555555ebff58, calling=0x7fffffffc140, argv=0x7fffffffc260) at ../../vm_eval.c:178

#51 0x000055555590b0cc in vm_call0_body (ec=0x555555ebff58, calling=0x7fffffffc140, argv=0x7fffffffc260) at ../../vm_eval.c:229

#52 0x000055555590a8bf in vm_call0_cc (ec=0x555555ebff58, recv=140737344833152, id=9361, argc=1, argv=0x7fffffffc260, cc=0x7ffff77cb9c0, kw_splat=0) at ../../vm_eval.c:101

#53 0x000055555590d89a in rb_funcallv_scope (recv=140737344833152, mid=9361, argc=1, argv=0x7fffffffc260, scope=CALL_FCALL) at ../../vm_eval.c:1070

--Type <RET> for more, q to quit, c to continue without paging--

#54 0x000055555590d91e in rb_funcallv (recv=140737344833152, mid=9361, argc=1, argv=0x7fffffffc260) at ../../vm_eval.c:1086

#55 0x0000555555701491 in rb_io_write (io=140737344833152, str=140737346561000) at ../../io.c:2340

#56 0x000055555570d5f6 in rb_io_print (argc=1, argv=0x7ffff78ff088, out=140737344833152) at ../../io.c:8793

#57 0x000055555570d67f in rb_f_print (argc=1, argv=0x7ffff78ff088, _=140737344831648) at ../../io.c:8854

#58 0x00005555558eb932 in ractor_safe_call_cfunc_m1 (recv=140737344831648, argc=1, argv=0x7ffff78ff088, func=0x55555570d64f <rb_f_print>) at ../../vm_insnhelper.c:3667

#59 0x00005555558ec572 in vm_call_cfunc_with_frame_ (ec=0x555555ebff58, reg_cfp=0x7ffff79fef30, calling=0x7fffffffd500, argc=1, argv=0x7ffff78ff088,

stack_bottom=0x7ffff78ff080) at ../../vm_insnhelper.c:3858

#60 0x00005555558ec7ec in vm_call_cfunc_with_frame (ec=0x555555ebff58, reg_cfp=0x7ffff79fef30, calling=0x7fffffffd500) at ../../vm_insnhelper.c:3904

#61 0x00005555558fcc43 in vm_sendish (method_explorer=mexp_search_method, block_handler=0, cd=0x555555f83a30, reg_cfp=0x7ffff79fef30, ec=0x555555ebff58)

at ../../vm_insnhelper.c:6172

#62 vm_exec_core (ec=0x555555ebff58) at ../../insns.def:909

#63 0x00005555559182a0 in rb_vm_exec (ec=0x555555ebff58) at ../../vm.c:2858

#64 0x00005555559193d7 in rb_iseq_eval_main (iseq=0x7ffff77cb538) at ../../vm.c:3205

#65 0x00005555556b2004 in rb_ec_exec_node (ec=0x555555ebff58, n=0x7ffff77cb538) at ../../eval.c:295

#66 0x00005555556b217b in ruby_run_node (n=0x7ffff77cb538) at ../../eval.c:333

#67 0x00005555555c37be in rb_main (argc=3, argv=0x7fffffffd8e8) at ../../main.c:42

#68 0x00005555555c381f in main (argc=3, argv=0x7fffffffd8e8) at ../../main.c:62

(gdb) c

Continuing.

-e:1:in 'IO#write': deadlock; recursive locking (ThreadError)

from -e:1:in 'Kernel#print'

from -e:1:in 'block in <main>'

from -e:1:in 'IO#write'

from -e:1:in 'Kernel#print'

from -e:1:in 'block in <main>'

from -e:1:in 'Kernel#loop'

from -e:1:in '<main>'

[Thread 0x7fffde5ff6c0 (LWP 71356) exited]

[Inferior 1 (process 71325) exited with code 01]

(gdb)