Bug #11001: 2.2.1 Segmentation fault in reserve_stack() function.

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
• Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: UNKNOWN

[kiyoka (Kiyoka Nishiyama)]

SEGV depends on stack limit size with 'ulimit -s ' .

This shell script [ulimit_change_test.sh] can reproduce SEGV on my Debian environment.
my Linux environment is Debian/GNU Linux 7.8.
But, I cannot reproduce this SEGV on Amazon Linux environment.

result on Debian 7.8

 $ /tmp/ulimit_change_test.sh 
8515
/tmp/ulimit_change_test.sh: 3 行: 20470 Segmentation fault      ./ruby --version
8514
/tmp/ulimit_change_test.sh: 3 行: 20471 Segmentation fault      ./ruby --version
8513
/tmp/ulimit_change_test.sh: 3 行: 20472 Segmentation fault      ./ruby --version
8512
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8511
/tmp/ulimit_change_test.sh: 3 行: 20475 Segmentation fault      ./ruby --version
8510
/tmp/ulimit_change_test.sh: 3 行: 20476 Segmentation fault      ./ruby --version
8509
/tmp/ulimit_change_test.sh: 3 行: 20477 Segmentation fault      ./ruby --version
8508
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8507
/tmp/ulimit_change_test.sh: 3 行: 20480 Segmentation fault      ./ruby --version
8506
/tmp/ulimit_change_test.sh: 3 行: 20481 Segmentation fault      ./ruby --version
8505
/tmp/ulimit_change_test.sh: 3 行: 20482 Segmentation fault      ./ruby --version
8504
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8503
/tmp/ulimit_change_test.sh: 3 行: 20485 Segmentation fault      ./ruby --version
8502
/tmp/ulimit_change_test.sh: 3 行: 20486 Segmentation fault      ./ruby --version
8501
/tmp/ulimit_change_test.sh: 3 行: 20487 Segmentation fault      ./ruby --version
8500
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8499
/tmp/ulimit_change_test.sh: 3 行: 20490 Segmentation fault      ./ruby --version
8498
/tmp/ulimit_change_test.sh: 3 行: 20491 Segmentation fault      ./ruby --version
8497
/tmp/ulimit_change_test.sh: 3 行: 20492 Segmentation fault      ./ruby --version
8496
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8495
/tmp/ulimit_change_test.sh: 3 行: 20495 Segmentation fault      ./ruby --version
8494
/tmp/ulimit_change_test.sh: 3 行: 20496 Segmentation fault      ./ruby --version
8493
/tmp/ulimit_change_test.sh: 3 行: 20497 Segmentation fault      ./ruby --version
8492
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
8491
/tmp/ulimit_change_test.sh: 3 行: 20500 Segmentation fault      ./ruby --version
8490
/tmp/ulimit_change_test.sh: 3 行: 20501 Segmentation fault      ./ruby --version
8489
/tmp/ulimit_change_test.sh: 3 行: 20502 Segmentation fault      ./ruby --version
 $ 

This SEGV occurs in reserve_stack() function.
I suspect that the buf[0x100] size is too small for margin.
I attached patch to fix it.

[william.l. (William L. L.)]

I also run into the bug too.

william@debianbox:~/talentlines/webui$ lsb_release -da
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 7.7 (wheezy)
Release:	7.7
Codename:	wheezy
william@debianbox:~/talentlines/webui$ uname -a
Linux debianbox 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u1 x86_64 GNU/Linux

william@debianbox:~/talentlines/webui$ ulimit -s 8191
william@debianbox:~/talentlines/webui$ ruby -v
Segmentation fault

william@debianbox:~/talentlines/webui$ ulimit -s 8000
william@debianbox:~/talentlines/webui$ ruby -v
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]

[nobu (Nobuyoshi Nakada)]

• Related to Bug #11030: Ruby 2.2.1 fails to compile with hardened GCC added

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Feedback
• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: UNKNOWN

Does it happen with recent versions?

[kubo (Takehiro Kubo)]

Same issue with recent ruby versions on Ubuntu 12.04.

I tried it with recent OS versions and found that

• Ubuntu 12.04 - Segmentation fault
• Ubuntu 12.10 - Segmentation fault
• Ubuntu 13.04 - No problem
• Ubuntu 14.04 - No problem
• Ubuntu 15.04 - No problem
• Debian 8.1 - No problem

IMO, this may be an issue of OS, not of ruby.

[normalperson (Eric Wong)]

[e-mail] wrote:

IMO, this may be an issue of OS, not of ruby.

Fwiw, valgrind chokes here, too.

I tested valgrind 3.9.0 on CentOS 7.0 and also backported to
Debian 7.0 (wheezy).

I comment reserve_stack out when I'm debugging other problems
with valgrind.

[ko1 (Koichi Sasada)]

On 2015/06/27 15:08, Eric Wong wrote:

Fwiw, valgrind chokes here, too.

Try it before valgrind.

$ ulimit -s unlimited

--
// SASADA Koichi at atdot dot net

[nobu (Nobuyoshi Nakada)]

Takehiro Kubo wrote:

IMO, this may be an issue of OS, not of ruby.

Any criteria where works on or not?
Runtime kernel versions?

[kubo (Takehiro Kubo)]

Any criteria where works on or not?
Runtime kernel versions?

Segmentaion fault

• Ubuntu 12.04 - kernel 3.2+
• Ubuntu 12.10 - kernel 3.5
• Debian 7.7 - kernel 3.2.63
• Debian 7.8 - kernel 3.4.105

No problem

• Ubuntu 13.04 - kernel 3.8
• Ubuntu 14.04 - kernel 3.13 or 3.16 (I deleted the VM. I don't know which is used.)
• Ubuntu 15.04 - kernel 3.19.3
• Debian 8.1 - kernel 3.16.7

Ubuntu
https://en.wikipedia.org/wiki/List_of_Ubuntu_releases#Table_of_versions
Debian 7.7
https://www.phoronix.com/scan.php?page=news_item&px=MTgxODY
Debian 7.8
http://news.softpedia.com/news/Debian-7-8-Arrives-with-Security-Fixes-and-Updated-Linux-Kernel-469629.shtml
Debian 8.1
http://news.softpedia.com/news/Debian-GNU-Linux-8-1-Jessie-Officially-Released-483592.shtml

On Ubuntu 12.04, stack size in emacs shell buffer is 8515 and
ruby gets segmentation fault. So I put 'ulimit -Ss 8192' in .bashrc
for workaround. (stack size in gnome-terminal is 8192.)

[jeremyevans0 (Jeremy Evans)]

• Status changed from Feedback to Closed