# GC.stress = true; lambda(&lambda{})

**URL:** <https://www.ruby-forum.com/t/gc-stress-true-lambda-lambda/96530>\
**Category:** Development\
**Created:** [June 29, 2006, 11:46am UTC](https://www.ruby-forum.com/t/gc-stress-true-lambda-lambda/96530 "2006-06-29T11:46:42Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [June 29, 2006, 11:46am UTC](https://www.ruby-forum.com/t/gc-stress-true-lambda-lambda/96530/1 "2006-06-29T11:46:42Z")

</div>

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% ./ruby -ve ‘GC.stress = true; lambda(&lambda{})’  
ruby 1.9.0 (2006-06-29) [i686-linux]  
zsh: segmentation fault (core dumped) ./ruby -ve ‘GC.stress = true;  
lambda(&lambda{})’  
% gdb ruby core  
GNU gdb 6.3-debian  
Copyright 2004 Free Software Foundation, Inc.  
GDB is free software, covered by the GNU General Public License, and you  
are  
welcome to change it and/or distribute copies of it under certain  
conditions.  
Type “show copying” to see the conditions.  
There is absolutely no warranty for GDB. Type “show warranty” for  
details.  
This GDB was configured as “i386-linux”…Using host libthread\_db  
library “/lib/tls/libthread\_db.so.1”.

Core was generated by `./ruby -ve GC.stress = true; lambda(&lambda{})’.  
Program terminated with signal 11, Segmentation fault.

warning: current\_sos: Can’t read pathname for load map: Input/output  
error

Reading symbols from /lib/tls/libdl.so.2…Reading symbols from  
/usr/lib/debug/lib/tls/libdl-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libdl.so.2  
Reading symbols from /lib/tls/libcrypt.so.1…Reading symbols from  
/usr/lib/debug/lib/tls/libcrypt-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libcrypt.so.1  
Reading symbols from /lib/tls/libm.so.6…Reading symbols from  
/usr/lib/debug/lib/tls/libm-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libm.so.6  
Reading symbols from /lib/tls/libc.so.6…Reading symbols from  
/usr/lib/debug/lib/tls/libc-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libc.so.6  
Reading symbols from /lib/ld-linux.so.2…Reading symbols from  
/usr/lib/debug/lib/ld-2.3.2.so…done.  
done.  
Loaded symbols for /lib/ld-linux.so.2  
#0 0x08065d22 in scope\_dup (scope=0x0) at eval.c:8002  
8002 scope-\>flags |= SCOPE\_DONT\_RECYCLE;  
(gdb) bt  
#0 0x08065d22 in scope\_dup (scope=0x0) at eval.c:8002  
#1 0x0806670e in proc\_alloc (klass=3084230560, lambda=2) at eval.c:8279  
#2 0x080667e8 in proc\_lambda () at eval.c:8348  
#3 0x0806ee1f in call\_cfunc (func=0x80667cd \<proc\_lambda\>,  
recv=3084290580, len=0, argc=0, argv=0x0) at eval.c:5502  
#4 0x08060f20 in rb\_call0 (klass=3084295120, recv=3084290580, id=10081,  
oid=10081, argc=0, argv=0x0, block=0x81708d8,  
body=0xb7d59d0c, flags=18) at eval.c:5722  
#5 0x08061c0d in rb\_call (klass=3084295120, recv=3084290580, mid=10081,  
argc=0, argv=0x0, block=0x81708d8,  
scope=CALLING\_FCALL, iter=0) at eval.c:5916  
#6 0x0805b2cf in rb\_eval (self=3084290580, n=0xb7d58600) at eval.c:3304  
#7 0x08056574 in eval\_node (self=3084290580, node=0xb7d58600) at  
eval.c:1408  
#8 0x08056b06 in ruby\_exec\_internal () at eval.c:1583  
#9 0x08056b4d in ruby\_exec () at eval.c:1598  
#10 0x08056b88 in ruby\_run () at eval.c:1614  
#11 0x08054714 in main (argc=3, argv=0xbfa0ea14, envp=0xbfa0ea24) at  
main.c:43  
(gdb)

& e$B$KEO$7$?e(B Proc e$B%_%V%8%’%/%H$NCf?H$Ne(B BLOCK  
e$B$r;H$C$F$$$k$N$K!"e(B  
e$B$=$Ne(B Proc e$B%_%V%8%’%/%H$,e(B  
GCe$B$5$l$F$7$^$&$h$&$G!"$3$s$J$+$s$8e(B  
e$B$G$9$+$M!#e(B

# Index: eval.c

RCS file: /src/ruby/eval.c,v  
retrieving revision 1.910  
diff -u -r1.910 eval.c  
— eval.c 28 Jun 2006 04:51:27 -0000 1.910  
+++ eval.c 29 Jun 2006 09:44:13 -0000  
@@ -2180,7 +2180,8 @@  
MEMCPY(argv, RARRAY(args)-\>ptr, VALUE, argc);  
}  
if (bpass) {\

- block = passing\_block(rb\_eval(self, bpass-\>nd\_body), &\_block);\

- 

```
   volatile VALUE save_block = rb_eval(self, bpass->nd_body); \

```

- block = passing\_block(save\_block, &\_block);  
}  
} while (0)

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [June 29, 2006, 3:18pm UTC](https://www.ruby-forum.com/t/gc-stress-true-lambda-lambda/96530/2 "2006-06-29T15:18:38Z")

</div>

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In message “Re: [ruby-dev:28902] GC.stress = true; lambda(&lambda{})”  
on Thu, 29 Jun 2006 18:46:10 +0900, Tanaka A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|& e$B$KEO$7$?e(B Proc e$B%_%V%8%'%/%H$NCf?H$Ne(B BLOCK e$B$r;H$C$F$$$k$N$K!"e(B  
|e$B$=$Ne(B Proc e$B%_%V%8%'%/%H$,e(B GCe$B$5$l$F$7$^$&$h$&$G!"$3$s$J$+$s$8e(B  
|e$B$G$9$+$M!#e(B

e$B$"$j$,$H$&$4$6$$$^$9!#%3%\_%C%H$7$F$/$@$5$$!#e(B