如何确定段错误是由于库不一致还是我正在使用的某个gem中的错误？
$ uname -a
Linux [redacted] 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ ruby1.9.1 --version
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]
$ CPUPROFILE_OBJECTS=1 CPUPROFILE=/tmp/my_app_profile_objects RUBYOPT="-r`gem1.9.1 which perftools | tail -1`" ruby1.9.1 -e '[].map'
-e:1: [BUG] Segmentation fault
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]
-- Control frame information -----------------------------------------------
c:0004 p:---- s:0009 b:0009 l:000008 d:000008 CFUNC :map
c:0003 p:0010 s:0006 b:0006 l:0011f8 d:0002f8 EVAL -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:0011f8 d:0011f8 TOP
-- Ruby level backtrace information ----------------------------------------
-e:1:in `<main>'
-e:1:in `map'
-- C level backtrace information -------------------------------------------
/usr/lib/libruby-1.9.1.so.1.9(+0x155b29) [0x7fd39f1dab29] ../sysdeps/x86_64/multiarch/strcpy-ssse3.S:1638
/usr/lib/libruby-1.9.1.so.1.9(+0x57709) [0x7fd39f0dc709] vfscanf.c:1777
/usr/lib/libruby-1.9.1.so.1.9(rb_bug+0xb7) [0x7fd39f0dd137] vfscanf.c:1796
/usr/lib/libruby-1.9.1.so.1.9(+0xf604f) [0x7fd39f17b04f] wcfuncs.c:49
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7fd39ecfe4c0] ../sysdeps/posix/killpg.c:38
/usr/lib/libruby-1.9.1.so.1.9(rb_check_type+0xd8) [0x7fd39f0de7e8] vfscanf.c:1963
/usr/lib/libruby-1.9.1.so.1.9(rb_data_typed_object_alloc+0xad) [0x7fd39f0f340d] iofdopen.c:51
/usr/lib/libruby-1.9.1.so.1.9(+0x54f9f) [0x7fd39f0d9f9f] vfscanf.c:2014
/usr/lib/libruby-1.9.1.so.1.9(rb_enumeratorize+0x33) [0x7fd39f0dae33] vfscanf.c:2373
/usr/lib/libruby-1.9.1.so.1.9(+0x14e9a1) [0x7fd39f1d39a1] ../sysdeps/x86_64/multiarch/../strcmp.S:293
/usr/lib/libruby-1.9.1.so.1.9(+0x145912) [0x7fd39f1ca912] ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:2001
/usr/lib/libruby-1.9.1.so.1.9(+0x14b31d) [0x7fd39f1d031d] ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:2032
/usr/lib/libruby-1.9.1.so.1.9(rb_iseq_eval_main+0xaf) [0x7fd39f1d769f] ../sysdeps/x86_64/multiarch/../strcmp.S:1811
/usr/lib/libruby-1.9.1.so.1.9(+0x5b172) [0x7fd39f0e0172] vfscanf.c:1471
/usr/lib/libruby-1.9.1.so.1.9(ruby_exec_node+0x1d) [0x7fd39f0e0c5d] vfscanf.c:2288
/usr/lib/libruby-1.9.1.so.1.9(ruby_run_node+0x1e) [0x7fd39f0e280e] psiginfo.c:209
ruby1.9.1() [0x4007db]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7fd39ece976d] libc-start.c:226
ruby1.9.1() [0x400809]
-- Other runtime information -----------------------------------------------
* Loaded script: -e
* Loaded features:
0 enumerator.so
1 /usr/lib/ruby/1.9.1/x86_64-linux/enc/encdb.so
2 /usr/lib/ruby/1.9.1/x86_64-linux/enc/trans/transdb.so
3 /usr/lib/ruby/1.9.1/rubygems/defaults.rb
4 /usr/lib/ruby/1.9.1/x86_64-linux/rbconfig.rb
5 /usr/lib/ruby/1.9.1/rubygems/deprecate.rb
6 /usr/lib/ruby/1.9.1/rubygems/exceptions.rb
7 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb
8 /usr/lib/ruby/1.9.1/rubygems.rb
9 /var/lib/gems/1.9.1/gems/perftools.rb-2.0.0/lib/perftools.so
* Process memory map:
00400000-00401000 r-xp 00000000 08:07 704429 /usr/bin/ruby1.9.1
00600000-00601000 r--p 00000000 08:07 704429 /usr/bin/ruby1.9.1
00601000-00602000 rw-p 00001000 08:07 704429 /usr/bin/ruby1.9.1
01464000-016e4000 rw-p 00000000 00:00 0 [heap]
7fd39c3e1000-7fd39cf53000 rw-p 00000000 00:00 0
7fd39cf53000-7fd39cf68000 r-xp 00000000 08:06 5443 /lib/x86_64-linux-gnu/libgcc_s.so.1
7fd39cf68000-7fd39d167000 ---p 00015000 08:06 5443 /lib/x86_64-linux-gnu/libgcc_s.so.1
7fd39d167000-7fd39d168000 r--p 00014000 08:06 5443 /lib/x86_64-linux-gnu/libgcc_s.so.1
7fd39d168000-7fd39d169000 rw-p 00015000 08:06 5443 /lib/x86_64-linux-gnu/libgcc_s.so.1
7fd39d169000-7fd39d24b000 r-xp 00000000 08:07 137087 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7fd39d24b000-7fd39d44a000 ---p 000e2000 08:07 137087 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7fd39d44a000-7fd39d452000 r--p 000e1000 08:07 137087 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7fd39d452000-7fd39d454000 rw-p 000e9000 08:07 137087 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7fd39d454000-7fd39d469000 rw-p 00000000 00:00 0
7fd39d469000-7fd39d47d000 r-xp 00000000 08:06 144897 /var/lib/gems/1.9.1/gems/perftools.rb-2.0.0/lib/perftools.so
7fd39d47d000-7fd39d67c000 ---p 00014000 08:06 144897 /var/lib/gems/1.9.1/gems/perftools.rb-2.0.0/lib/perftools.so
7fd39d67c000-7fd39d67d000 r--p 00013000 08:06 144897 /var/lib/gems/1.9.1/gems/perftools.rb-2.0.0/lib/perftools.so
7fd39d67d000-7fd39d67e000 rw-p 00014000 08:06 144897 /var/lib/gems/1.9.1/gems/perftools.rb-2.0.0/lib/perftools.so
7fd39d67e000-7fd39d682000 rw-p 00000000 00:00 0
7fd39d682000-7fd39d684000 r-xp 00000000 08:07 157727 /usr/lib/ruby/1.9.1/x86_64-linux/enc/trans/transdb.so
7fd39d684000-7fd39d884000 ---p 00002000 08:07 157727 /usr/lib/ruby/1.9.1/x86_64-linux/enc/trans/transdb.so
7fd39d884000-7fd39d885000 r--p 00002000 08:07 157727 /usr/lib/ruby/1.9.1/x86_64-linux/enc/trans/transdb.so
7fd39d885000-7fd39d886000 rw-p 00003000 08:07 157727 /usr/lib/ruby/1.9.1/x86_64-linux/enc/trans/transdb.so
7fd39d886000-7fd39d888000 r-xp 00000000 08:07 157743 /usr/lib/ruby/1.9.1/x86_64-linux/enc/encdb.so
7fd39d888000-7fd39da87000 ---p 00002000 08:07 157743 /usr/lib/ruby/1.9.1/x86_64-linux/enc/encdb.so
7fd39da87000-7fd39da88000 r--p 00001000 08:07 157743 /usr/lib/ruby/1.9.1/x86_64-linux/enc/encdb.so
7fd39da88000-7fd39da89000 rw-p 00002000 08:07 157743 /usr/lib/ruby/1.9.1/x86_64-linux/enc/encdb.so
7fd39da89000-7fd39e16c000 r--p 00000000 08:07 134744 /usr/lib/locale/locale-archive
7fd39e16c000-7fd39e265000 r-xp 00000000 08:06 5454 /lib/x86_64-linux-gnu/libm-2.15.so
7fd39e265000-7fd39e464000 ---p 000f9000 08:06 5454 /lib/x86_64-linux-gnu/libm-2.15.so
7fd39e464000-7fd39e465000 r--p 000f8000 08:06 5454 /lib/x86_64-linux-gnu/libm-2.15.so
7fd39e465000-7fd39e466000 rw-p 000f9000 08:06 5454 /lib/x86_64-linux-gnu/libm-2.15.so
7fd39e466000-7fd39e46f000 r-xp 00000000 08:06 5430 /lib/x86_64-linux-gnu/libcrypt-2.15.so
7fd39e46f000-7fd39e66f000 ---p 00009000 08:06 5430 /lib/x86_64-linux-gnu/libcrypt-2.15.so
7fd39e66f000-7fd39e670000 r--p 00009000 08:06 5430 /lib/x86_64-linux-gnu/libcrypt-2.15.so
7fd39e670000-7fd39e671000 rw-p 0000a000 08:06 5430 /lib/x86_64-linux-gnu/libcrypt-2.15.so
7fd39e671000-7fd39e69f000 rw-p 00000000 00:00 0
7fd39e69f000-7fd39e6a1000 r-xp 00000000 08:06 5435 /lib/x86_64-linux-gnu/libdl-2.15.so
7fd39e6a1000-7fd39e8a1000 ---p 00002000 08:06 5435 /lib/x86_64-linux-gnu/libdl-2.15.so
7fd39e8a1000-7fd39e8a2000 r--p 00002000 08:06 5435 /lib/x86_64-linux-gnu/libdl-2.15.so
7fd39e8a2000-7fd39e8a3000 rw-p 00003000 08:06 5435 /lib/x86_64-linux-gnu/libdl-2.15.so
7fd39e8a3000-7fd39e8aa000 r-xp 00000000 08:06 5508 /lib/x86_64-linux-gnu/librt-2.15.so
7fd39e8aa000-7fd39eaa9000 ---p 00007000 08:06 5508 /lib/x86_64-linux-gnu/librt-2.15.so
7fd39eaa9000-7fd39eaaa000 r--p 00006000 08:06 5508 /lib/x86_64-linux-gnu/librt-2.15.so
7fd39eaaa000-7fd39eaab000 rw-p 00007000 08:06 5508 /lib/x86_64-linux-gnu/librt-2.15.so
7fd39eaab000-7fd39eac3000 r-xp 00000000 08:06 5502 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fd39eac3000-7fd39ecc2000 ---p 00018000 08:06 5502 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fd39ecc2000-7fd39ecc3000 r--p 00017000 08:06 5502 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fd39ecc3000-7fd39ecc4000 rw-p 00018000 08:06 5502 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fd39ecc4000-7fd39ecc8000 rw-p 00000000 00:00 0
7fd39ecc8000-7fd39ee7b000 r-xp 00000000 08:06 5422 /lib/x86_64-linux-gnu/libc-2.15.so
7fd39ee7b000-7fd39f07a000 ---p 001b3000 08:06 5422 /lib/x86_64-linux-gnu/libc-2.15.so
7fd39f07a000-7fd39f07e000 r--p 001b2000 08:06 5422 /lib/x86_64-linux-gnu/libc-2.15.so
7fd39f07e000-7fd39f080000 rw-p 001b6000 08:06 5422 /lib/x86_64-linux-gnu/libc-2.15.so
7fd39f080000-7fd39f085000 rw-p 00000000 00:00 0
7fd39f085000-7fd39f0f0000 r-xp 00000000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f0f0000-7fd39f0f3000 rwxp 0006b000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f0f3000-7fd39f275000 r-xp 0006e000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f275000-7fd39f474000 ---p 001f0000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f474000-7fd39f479000 r--p 001ef000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f479000-7fd39f47d000 rw-p 001f4000 08:07 158047 /usr/lib/libruby-1.9.1.so.1.9.1
7fd39f47d000-7fd39f499000 rw-p 00000000 00:00 0
7fd39f499000-7fd39f4bb000 r-xp 00000000 08:06 5402 /lib/x86_64-linux-gnu/ld-2.15.so
7fd39f59b000-7fd39f6a1000 rw-p 00000000 00:00 0
7fd39f6b4000-7fd39f6b5000 rw-p 00000000 00:00 0
7fd39f6b5000-7fd39f6b6000 ---p 00000000 00:00 0
7fd39f6b6000-7fd39f6bb000 rw-p 00000000 00:00 0
7fd39f6bb000-7fd39f6bc000 r--p 00022000 08:06 5402 /lib/x86_64-linux-gnu/ld-2.15.so
7fd39f6bc000-7fd39f6be000 rw-p 00023000 08:06 5402 /lib/x86_64-linux-gnu/ld-2.15.so
7fff507f8000-7fff50819000 rw-p 00000000 00:00 0 [stack]
7fff50941000-7fff50942000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
[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 (core dumped)
答案 0 :(得分：5)
您可以通过以下方式找出软件的哪个部分导致了分段错误 - 这对您来说可能并不意外 - 调试！。正如你所看到的......
Aborted (core dumped)
......有一个核心转储。
只需在你的可执行文件和核心转储上启动gdb，然后找出strcpy的参数（参见你的回溯的第一行）。然后通过堆栈跟踪和代码向后走。似乎编译了调试符号，所以你很幸运，你可以看到实际调用了哪个函数以及提供了哪些参数 - 至少如果bug没有破坏堆栈。
但是，如果您不熟悉调试C或汇编代码，您可能希望等待perftools的开发人员调试此issue。
答案 1 :(得分：-2)
看起来Ruby本身正在崩溃，所以很有可能，这是一个错误。 Ruby 1.9.3是最新版本，因此您可以尝试查看错误是否已修复。