# \[Ruby 1.9-Bug#3921\]\[Open\] \[BUG\] Segmentation fault in set\_trace\_func

**URL:** <https://www.ruby-forum.com/t/ruby-1-9-bug-3921-open-bug-segmentation-fault-in-set-trace-func/196202>\
**Category:** Development\
**Created:** [October 8, 2010, 12:55pm UTC](https://www.ruby-forum.com/t/ruby-1-9-bug-3921-open-bug-segmentation-fault-in-set-trace-func/196202 "2010-10-08T12:55:28Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tomoyuki\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c0e974/32.png) [@Tomoyuki\_C](https://www.ruby-forum.com/u/Tomoyuki_C)\
**Post date:** [October 8, 2010, 12:55pm UTC](https://www.ruby-forum.com/t/ruby-1-9-bug-3921-open-bug-segmentation-fault-in-set-trace-func/196202/1 "2010-10-08T12:55:28Z")

</div>

Bug #3921: [BUG] Segmentation fault in set\_trace\_func  
[http://redmine.ruby-lang.org/issues/show/3921](http://redmine.ruby-lang.org/issues/show/3921)

e$B5/I\<\<Te(B: Tomoyuki C.  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
ruby -v: ruby 1.9.3dev (2010-10-07 trunk 29420) [i686-linux]

e$B0J2\<$N$h$&$K$9$k$He(B Segmentation fault e$B$,H/@8$7$^$9!#e(B

$ ruby -e’  
func = lambda{|e, f, l, i, b, k|  
set\_trace\_func(nil)  
b.eval(“self”)  
}

set\_trace\_func(func)  
’  
-e:7: [BUG] Segmentation fault  
ruby 1.9.3dev (2010-10-07 trunk 29420) [i686-linux]

## – control frame ---------- c:0003 p:0024 s:0007 b:0007 l:0003f4 d:0006c8 EVAL -e:7 c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH c:0001 p:0000 s:0002 b:0002 l:0003f4 d:0003f4 TOP

## – Ruby level backtrace information

-e:7:in `’

## – C level backtrace information

ruby [0x816e422]  
ruby [0x81af141]  
ruby(rb\_bug+0x28) [0x81af1d8]  
ruby [0x80fbd35]  
[0xb77a9410]  
ruby [0x8160fc3]  
ruby [0x816255c]  
ruby [0x8167e2c]  
ruby(rb\_iseq\_eval\_main+0x1da) [0x816818a]  
ruby [0x805b2c2]  
ruby(ruby\_run\_node+0x32) [0x805cce2]  
ruby [0x805a6a0]  
/lib/tls/i686/cmov/libc.so.6(\_\_libc\_start\_main+0xe5) [0xb75cb775]  
ruby [0x805a5a1]

[NOTE]  
You may have encountered a bug in the Ruby interpreter or extension  
libraries.  
Bug reports are welcome.  
For details: [http://www.ruby-lang.org/bugreport.html](http://www.ruby-lang.org/bugreport.html)

---

<div class="post-metadata">

**Author:** ![Tomoyuki\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c0e974/32.png) [@Tomoyuki\_C](https://www.ruby-forum.com/u/Tomoyuki_C)\
**Post date:** [October 10, 2010, 2:24am UTC](https://www.ruby-forum.com/t/ruby-1-9-bug-3921-open-bug-segmentation-fault-in-set-trace-func/196202/2 "2010-10-10T02:24:39Z")

</div>

e$B%A%1%C%He(B #3921 e$B$,99?7$5$l$^$7$?!#e(B (by Nobuyoshi N.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

This issue was solved with changeset r29429.  
Tomoyuki, thank you for reporting this issue.  
Your contribution to Ruby is greatly appreciated.  
May Ruby be with you.

* * *

[http://redmine.ruby-lang.org/issues/show/3921](http://redmine.ruby-lang.org/issues/show/3921)