[Mongrel] Mongrels stop responding

Evan Weaver evan at cloudbur.st
Tue Apr 1 10:10:03 EDT 2008


Oh, I meant a Ruby backtrace:
http://eigenclass.org/hiki.rb?ruby+live+process+introspection

Evan

On Tue, Apr 1, 2008 at 9:55 AM, Michael Kinney <lists at ruby-forum.com> wrote:
> Evan Weaver wrote:
>  > Gdb the stuck mongrel and force it to raise a backtrace.
>
>  I had to wait for one of them to hang again. This time, no CLOSE_WAIT.
>  Also note, I've never used gdb before. I googled up how to attach to a
>  PID and hit the "backtrace" command. If there's anything else I need to
>  do, the GDB session is still available to me for a limited time (until
>  enough people complain about the app being down).
>
>  GNU gdb 6.4.90-debian
>  Copyright (C) 2006 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 "i486-linux-gnu".
>  Attaching to process 31635
>  Reading symbols from /usr/bin/ruby1.8...(no debugging symbols
>  found)...done.
>  Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
>  Reading symbols from /usr/lib/libruby1.8.so.1.8...(no debugging symbols
>  found)...done.
>  Loaded symbols for /usr/lib/libruby1.8.so.1.8
>  Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...(no debugging
>  symbols found)...done.
>  [Thread debugging using libthread_db enabled]
>  [New Thread -1211282784 (LWP 31635)]
>  [New Thread -1262781520 (LWP 31645)]
>  Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0
>  Reading symbols from /lib/tls/i686/cmov/libdl.so.2...(no debugging
>  symbols found)...done.
>  Loaded symbols for /lib/tls/i686/cmov/libdl.so.2
>  Reading symbols from /lib/tls/i686/cmov/libcrypt.so.1...
>  (no debugging symbols found)...done.
>  Loaded symbols for /lib/tls/i686/cmov/libcrypt.so.1
>  Reading symbols from /lib/tls/i686/cmov/libm.so.6...(no debugging
>  symbols found)...done.
>  Loaded symbols for /lib/tls/i686/cmov/libm.so.6
>  Reading symbols from /lib/tls/i686/cmov/libc.so.6...(no debugging
>  symbols found)...done.
>  Loaded symbols for /lib/tls/i686/cmov/libc.so.6
>  Reading symbols from /lib/ld-linux.so.2...(no debugging symbols
>  found)...done.
>  Loaded symbols for /lib/ld-linux.so.2
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/etc.so...
>  (no debugging symbols found)...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/etc.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/stringio.so...(no
>  debugging symbols found)...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/stringio.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/syck.so...(no
>  debugging symbols found)...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/syck.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/socket.so...(no
>  debugging symbols found)...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/socket.so
>  Reading symbols from
>  /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/http11.so...done.
>  Loaded symbols for
>  /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/../lib/http11.so
>  Reading symbols from
>  /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.1/lib/fastthread.so...done.
>  Loaded symbols for
>  /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.1/lib/fastthread.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/zlib.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/zlib.so
>  Reading symbols from /usr/lib/libz.so.1...done.
>  Loaded symbols for /usr/lib/libz.so.1
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/strscan.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/strscan.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/bigdecimal.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/bigdecimal.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/nkf.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/nkf.so
>  Reading symbols from
>  /usr/local/lib/site_ruby/1.8/i486-linux/oci8lib.so...done.
>  Loaded symbols for /usr/local/lib/site_ruby/1.8/i486-linux/oci8lib.so
>  Reading symbols from
>  /usr/lib/oracle/11.1.0.1/client/lib/libclntsh.so.11.1...done.
>  Loaded symbols for /usr/lib/oracle/11.1.0.1/client/lib/libclntsh.so.11.1
>  Reading symbols from
>  /usr/lib/oracle/11.1.0.1/client/lib/libnnz11.so...done.
>  Loaded symbols for /usr/lib/oracle/11.1.0.1/client/lib/libnnz11.so
>  Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...done.
>  Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
>  Reading symbols from /usr/lib/libaio.so.1...done.
>  Loaded symbols for /usr/lib/libaio.so.1
>  Reading symbols from
>  /usr/lib/oracle/11.1.0.1/client/lib/libociicus.so...done.
>  Loaded symbols for /usr/lib/oracle/11.1.0.1/client/lib/libociicus.so
>  Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...done.
>  Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
>  Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...done.
>  Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
>  Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...done.
>  Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/fcntl.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/fcntl.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/digest/md5.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/digest/md5.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/digest.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/digest.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/racc/cparse.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/racc/cparse.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/iconv.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/iconv.so
>  Reading symbols from /usr/lib/ruby/1.8/i486-linux/openssl.so...done.
>  Loaded symbols for /usr/lib/ruby/1.8/i486-linux/openssl.so
>  Reading symbols from /usr/lib/i686/cmov/libssl.so.0.9.8...done.
>  Loaded symbols for /usr/lib/i686/cmov/libssl.so.0.9.8
>  Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.8...done.
>  Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.8
>  Reading symbols from /lib/tls/i686/cmov/libnss_dns.so.2...done.
>  Loaded symbols for /lib/tls/i686/cmov/libnss_dns.so.2
>  Reading symbols from /lib/tls/i686/cmov/libresolv.so.2...done.
>  Loaded symbols for /lib/tls/i686/cmov/libresolv.so.2
>  Failed to read a valid object file image from memory.
>  0xb7f45410 in ?? ()
>  (gdb) backtrace
>  #0  0xb7f45410 in ?? ()
>  #1  0xbf9f0fa8 in ?? ()
>  #2  0xbf9f0e90 in ?? ()
>  #3  0xbf9f0f10 in ?? ()
>  #4  0xb7d99131 in select () from /lib/tls/i686/cmov/libc.so.6
>  #5  0xb7e99f91 in rb_thread_schedule () from /usr/lib/libruby1.8.so.1.8
>  #6  0xb7e9ac80 in rb_thread_wait_for () from /usr/lib/libruby1.8.so.1.8
>  #7  0xb7ee750b in Init_process () from /usr/lib/libruby1.8.so.1.8
>  #8  0xb7e94653 in rb_provide () from /usr/lib/libruby1.8.so.1.8
>  #9  0xb7e9bdc2 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #10 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #11 0xb7ea4997 in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #12 0xb7ea75be in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #13 0xb7ea88bb in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #14 0xb7e9463e in rb_provide () from /usr/lib/libruby1.8.so.1.8
>  #15 0xb7e9bdc2 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #16 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #17 0xb7ea4997 in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #18 0xb7ea5d0c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #19 0xb7ea75be in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #20 0xb7e9faf4 in ruby_stop () from /usr/lib/libruby1.8.so.1.8
>  #21 0xb7e94247 in rb_provide () from /usr/lib/libruby1.8.so.1.8
>  #22 0xb7e9bdc2 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #23 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #24 0xb7e9ce47 in rb_obj_call_init () from /usr/lib/libruby1.8.so.1.8
>  #25 0xb7e9cea2 in rb_obj_call_init () from /usr/lib/libruby1.8.so.1.8
>  #26 0xb7e94653 in rb_provide () from /usr/lib/libruby1.8.so.1.8
>  #27 0xb7e9bdc2 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #28 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #29 0xb7ea486c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #30 0xb7ea5d0c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #31 0xb7ea2e39 in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #32 0xb7e9c6e1 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #33 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #34 0xb7ea486c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #35 0xb7e9c6e1 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #36 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #37 0xb7ea486c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #38 0xb7e9c6e1 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #39 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #40 0xb7ea486c in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #41 0xb7ea4d31 in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  #42 0xb7ea9baa in rb_load () from /usr/lib/libruby1.8.so.1.8
>  #43 0xb7eaa487 in rb_f_require () from /usr/lib/libruby1.8.so.1.8
>  #44 0xb7e94653 in rb_provide () from /usr/lib/libruby1.8.so.1.8
>  #45 0xb7e9bdc2 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #46 0xb7e9cb38 in rb_iter_break () from /usr/lib/libruby1.8.so.1.8
>  #47 0xb7ea4997 in rb_apply () from /usr/lib/libruby1.8.so.1.8
>  ---Type <return> to continue, or q <return> to quit---
>  #48 0xb7eaa618 in rb_load_protect () from /usr/lib/libruby1.8.so.1.8
>  #49 0xb7eaa662 in ruby_exec () from /usr/lib/libruby1.8.so.1.8
>  #50 0xb7eaa69f in ruby_run () from /usr/lib/libruby1.8.so.1.8
>  #51 0x08048612 in main ()
>  (gdb)
>  --
>
>
> Posted via http://www.ruby-forum.com/.
>  _______________________________________________
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>  Mongrel-users at rubyforge.org
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>



-- 
Evan Weaver
Cloudburst, LLC


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