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Bug #1338

closed

Kernel#select crashes when many files are opened

Bug #1338: Kernel#select crashes when many files are opened

Added by macks (Kengo Matsuyama) over 16 years ago. Updated over 14 years ago.

Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 1.9.2dev (2009-03-31 trunk 23101) [i686-linux]
Backport:
[ruby-dev:38221]

Description

=begin
以下のコードがクラッシュします。

Process.setrlimit(Process::RLIMIT_NOFILE, 2048)
fd = 2000.times.map { open("/bin/ls") }
select([fd.last], [], [], 0)

添付したパッチで手元の環境では動くようになりましたが、
他の環境(win32 とか)での動作は分からないです。

また、具体的な再現コードは作れなかったのですが、
thread.c の do_select() の orig_read, orig_write, orig_except の扱いは、
バグを引き起こしそうです。(fd_set 型をそのまま使っている)

以下はクラッシュ時のログです。

$ ./ruby -e 'Process.setrlimit(Process::RLIMIT_NOFILE, 2048); fd = 2000.times.map { open("/bin/ls") }; select([fd.last], [], [], 0)'
-e:1: [BUG] Segmentation fault
ruby 1.9.2dev (2009-03-31 trunk 23101) [i686-linux]

-- control frame ----------
c:0004 p:---- s:0014 b:0014 l:000013 d:000013 CFUNC :select
c:0003 p:0072 s:0007 b:0007 l:00199c d:000e68 EVAL -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:00199c d:00199c TOP :17

-e:1:in <main>' -e:1:in select'

-- C level backtrace information -------------------------------------------
0x81591a5 ./ruby(rb_vm_bugreport+0xb5) [0x81591a5]
0x819458e ./ruby [0x819458e]
0x8194628 ./ruby(rb_bug+0x28) [0x8194628]
0x80f2ef5 ./ruby [0x80f2ef5]
0xb7f8640c [0xb7f8640c]
0xb7e0f826 /lib/i686/cmov/libc.so.6(cfree+0x96) [0xb7e0f826]
0x8159c09 ./ruby(rb_fd_term+0x19) [0x8159c09]
0x80709d0 ./ruby [0x80709d0]
0x805c92c ./ruby(rb_ensure+0x9c) [0x805c92c]
0x8070bf4 ./ruby [0x8070bf4]
0x81451ad ./ruby [0x81451ad]
0x8156a06 ./ruby [0x8156a06]
0x8149c9b ./ruby [0x8149c9b]
0x81506a2 ./ruby [0x81506a2]
0x8150913 ./ruby(rb_iseq_eval_main+0x1a3) [0x8150913]
0x805ce07 ./ruby(ruby_exec_node+0x97) [0x805ce07]
0x805e596 ./ruby(ruby_run_node+0x46) [0x805e596]
0x805c100 ./ruby(main+0x60) [0x805c100]
0xb7db5455 /lib/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7db5455]
0x805c001 ./ruby [0x805c001]

[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

Aborted
=end


Files

fix_select_crash.patch (1.91 KB) fix_select_crash.patch macks (Kengo Matsuyama), 03/31/2009 05:42 PM

Updated by matz (Yukihiro Matsumoto) over 16 years ago Actions #1

  • Status changed from Open to Closed
  • % Done changed from 0 to 100

=begin
Applied in changeset r23109.
=end

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