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Feature #18483

Updated by ko1 (Koichi Sasada) 6 months ago

Now development version of MRI (`RUBY_DEVEL` macro enabled binary) supports `RUBY_ON_BUG` environment variable. 
 It kicks the specified process with PID of the Ruby process when `rb_bug()` function is called, like: 

 ``` 
 $ RUBY_ON_BUG='gdb -p' ./miniruby -e 'Process.kill(:SEGV, $$)' 
 -e:1: [BUG] Segmentation fault at 0x000003e800000512 
 ruby 3.2.0dev (2022-01-12T02:02:24Z master dcb02cb28a) [x86_64-linux] 

 GNU gdb (Ubuntu 9.2-0ubuntu1~20.04) 9.2 
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 Attaching to process 1298 
 Reading symbols from /home/ko1/ruby/build/trunk/miniruby... 
 Reading symbols from /lib/x86_64-linux-gnu/libz.so.1... 
 (No debugging symbols found in /lib/x86_64-linux-gnu/libz.so.1) 
 Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0... 
 Reading symbols from /usr/lib/debug/.build-id/e5/4761f7b554d0fcc1562959665d93dffbebdaf0.debug... 
 [Thread debugging using libthread_db enabled] 
 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 
 Reading symbols from /lib/x86_64-linux-gnu/librt.so.1... 
 Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/librt-2.31.so... 
 Reading symbols from /lib/x86_64-linux-gnu/libgmp.so.10... 
 (No debugging symbols found in /lib/x86_64-linux-gnu/libgmp.so.10) 
 Reading symbols from /lib/x86_64-linux-gnu/libcapstone.so.3... 
 (No debugging symbols found in /lib/x86_64-linux-gnu/libcapstone.so.3) 
 Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2... 
 Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.31.so... 
 Reading symbols from /lib/x86_64-linux-gnu/libcrypt.so.1... 
 (No debugging symbols found in /lib/x86_64-linux-gnu/libcrypt.so.1) 
 Reading symbols from /lib/x86_64-linux-gnu/libm.so.6... 
 Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libm-2.31.so... 
 Reading symbols from /lib/x86_64-linux-gnu/libc.so.6... 
 Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.31.so... 
 Reading symbols from /lib64/ld-linux-x86-64.so.2... 
 (No debugging symbols found in /lib64/ld-linux-x86-64.so.2) 
 0x00007fc0a0099dba in __GI___wait4 (pid=1299, stat_loc=stat_loc@entry=0x558e2382b5d8, options=options@entry=0, usage=usage@entry=0x0) 
     at ../sysdeps/unix/sysv/linux/wait4.c:27 
 27        ../sysdeps/unix/sysv/linux/wait4.c: No such file or directory. 
 (gdb) 
 ``` 

 This feature is convenient for CI and so on. 
 Again, this feature is only enabled on `RUBY_DEVEL`. This is because I'm not sure it can be a security issue. 
 However, we discussed about this feature and we concluded it is not a problem to contain this kind of feature (if (it `RUBYOPT` is modified, it is already issue). 

 So I want to enable this feature. 

 Two points we need to discuss. 

 * anyone have security concern about this feature on release version? 
 * `RUBY_ON_BUG` is named without any discussion because it is only MRI development. However if it is enabled on release version, the name should be discussed. Any good name? 

 Thanks, 
 Koichi

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