[ruby-core:26244] [Bug #2258] Kernel#require inside rb_require() inside rb_protect() inside SysV context fails

Bug #2258: Kernel#require inside rb_require() inside rb_protect() inside SysV context fails
http://redmine.ruby-lang.org/issues/show/2258

Author: Suraj Kurapati
Status: Open, Priority: Normal
Category: ext
ruby -v: ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

Hi,

I get the following error when I call Kernel#require()
inside a Ruby script that is being run by rb_require(),
which itself is running inside rb_protect(), which in
turn is running inside a UNIX System V context.

"[BUG] object allocation during garbage collection phase"

An example test case to reproduce this bug is attached, and
the result of running this test case is shown below.

Note that this test case runs correctly without any errors
if you remove the call to Kernel#require in "hello.rb" line 7.

Thanks for your consideration.


###############################################################
# ruby -v extconf.rb && sed -i 's,-shared,,g' Makefile
###############################################################

ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]
checking for ruby_init() in -lruby-static... yes
checking for sys/ucontext.h... yes
creating Makefile

###############################################################
# make && ./main.so
###############################################################

gcc -I. -I/usr/include/ruby-1.9.1/i686-linux -I/usr/include/ruby-1.9.1/ruby/backward -I/usr/include/ruby-1.9.1 -I. -DHAVE_SYS_UCONTEXT_H  -D_FILE_OFFSET_BITS=64  -fPIC -march=i686 -mtune=generic -O2 -pipe -O2 -g -Wall -Wno-parentheses  -fPIC  -o main.o -c main.c
main.c: In function ‘relay_from_main_to_ruby’:
main.c:15: warning: implicit declaration of function ‘swapcontext’
main.c: In function ‘main’:
main.c:99: warning: implicit declaration of function ‘getcontext’
main.c:100: warning: implicit declaration of function ‘makecontext’
gcc  -o main.so main.o -L. -L/usr/lib -Wl,-R/usr/lib -L. -Wl,--hash-style=gnu -Wl,--as-needed -rdynamic -Wl,-export-dynamic    -Wl,-R -Wl,/usr/lib -L/usr/lib -lruby -lruby-static  -lpthread -lrt -ldl -lcrypt -lm   -lc
Main: relay_from_main_to_ruby() begin
Ruby: context begin
Ruby: relay 0
Ruby: relay_from_ruby_to_main() begin
Main: relay_from_main_to_ruby() end
Main: relay_from_main_to_ruby() begin
Ruby: relay_from_ruby_to_main() end
Ruby: relay 1
Ruby: relay_from_ruby_to_main() begin
Main: relay_from_main_to_ruby() end
Main: relay_from_main_to_ruby() begin
Ruby: relay_from_ruby_to_main() end
Ruby: relay 2
Ruby: relay_from_ruby_to_main() begin
Main: relay_from_main_to_ruby() end
Main: relay_from_main_to_ruby() begin
Ruby: relay_from_ruby_to_main() end
Ruby: require 'hello' begin
~~~~> Hello World!  The time is 2009-10-22 16:36:06 -0700.
~~~~> Doing relay from /home/sun/lab/ruby-ucontext/hello.rb:3
Ruby: relay_from_ruby_to_main() begin
Main: relay_from_main_to_ruby() end
Main: relay_from_main_to_ruby() begin
Ruby: relay_from_ruby_to_main() end
~~~~> OMG, back from main!! :-)
/home/sun/lab/ruby-ucontext/hello.rb:7: [BUG] Segmentation fault
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

-- control frame ----------
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :require
c:0003 p:0080 s:0006 b:0006 l:000005 d:000005 TOP    /home/sun/lab/ruby-ucontext/hello.rb:7
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:001cac d:001cac TOP   
---------------------------
/home/sun/lab/ruby-ucontext/hello.rb:7: [BUG] object allocation during garbage collection phase
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

-- control frame ----------
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :require
c:0003 p:0080 s:0006 b:0006 l:000005 d:000005 TOP    /home/sun/lab/ruby-ucontext/hello.rb:7
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:001cac d:001cac TOP   
---------------------------
Segmentation fault


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