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Bug #12118

Updated by naruse (Yui NARUSE) over 6 years ago

Hello! 

 On Motorola 680x0, ruby2.2 and ruby2.3 segfault when running the Ruby interpretor: 

 ./miniruby -I./lib -I. -I.ext/common    ./tool/runruby.rb --extout=.ext    -- --disable-gems -r./m68k-linux-gnu-fake ./tool/rbinstall.rb --make="/usr/bin/make" --dest-dir="/<<PKGBUILDDIR>>/debian/tmp" --extout=".ext" --mflags="-w" --make-flags="w -- DESTDIR=/<<PKGBUILDDIR>>/debian/tmp" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="doc" 
 installing binary commands:     /usr/bin 
 /<<PKGBUILDDIR>>/lib/fileutils.rb:250: [BUG] Segmentation fault at 0x5f583332 
 ruby 2.3.0p0 (2015-12-25) [m68k-linux-gnu] 

 This happens while building ruby2.3 on Debian, for example [1]. 

 Andreas Schwab has already investigated into this issue and he came up with the following patch for ruby2.2 [2]: 

 ```diff 
 Index: ruby-2.2.3/thread_pthread.c 
 =================================================================== 
 --- ruby-2.2.3.orig/thread_pthread.c 
 +++ ruby-2.2.3/thread_pthread.c 
 @@ -678,15 +678,14 @@ reserve_stack(volatile char *limit, size 
 	 limit += size; 
 	 if (limit > end) { 
 	     size = limit - end; 
 - 	     limit = alloca(size); 
 + 	     limit = alloca(stack_check_margin+size); 
 	     limit[stack_check_margin+size-1] = 0; 
 	 } 
      } 
      else { 
 	 limit -= size; 
 	 if (buf > limit) { 
 - 	     limit = alloca(buf - limit); 
 - 	     limit -= stack_check_margin; 
 + 	     limit = alloca(buf - limit + stack_check_margin); 
 	     limit[0] = 0; 
 	 } 
      } 
 ``` 

 The same patch works fine on ruby2.3, I although I had to modify it so it still applies the same way in ruby2.3. 
 The bug can be reproduced in a qemu-m68k chroot environment which can be set up quite easily [3]. 

 It would be very important for Debian's Motorola 680x0 port to get this issue fixed. 

 Thanks, 
 Adrian 

 > [1] https://buildd.debian.org/status/fetch.php?pkg=ruby2.3&arch=m68k&ver=2.3.0-2&stamp=1455092994 
 > [2] https://lists.debian.org/debian-68k/2015/11/msg00057.html 
 > [3] https://wiki.debian.org/M68k/sbuildQEMU

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