Debugowanie w GDB

1

Witam.
Po tym jak podczas debugowania serwera Apache Evans Debugger się wyłożył postanowiłem zwrócić się w stronę starego, dobrego GDB. Jednak i on nie okazał się w tej materii bezproblemowy. Widać Apache 2.4.23 zarypie każdy debugger ;-).
Po włączeniu GDB podłączyłem go do procesu httpd (2.4.23), wpisałem continue i serwer ruszył. Kiedy chciałem zapauzować proces standardową kombinacją klawiszy Ctrl+C, proces otrzymał sygnał SIGHUP Hangup. Według mojej aktualnej wiedzy na temet GDB program powinien otrzymać sygnał SIGINT Interrupt. Po ponownym odpauzowaniu zobaczyłem że program "normalnie" się zrąbał. Całość wygląda tak:

GNU gdb (Ubuntu 7.10-1ubuntu2) 7.10
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) attach 92391
Attaching to process 92391
Reading symbols from /usr/local/apache2/bin/httpd...done.
Reading symbols from /usr/local/pcre/lib/libpcre.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/local/apache2/lib/libaprutil-1.so.0...done.
Reading symbols from /usr/local/apache2/lib/libapr-1.so.0...done.
Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libpthread-2.21.so...done.
done.
[New LWP 92418]
[New LWP 92417]
[New LWP 92416]
[New LWP 92415]
[New LWP 92414]
[New LWP 92413]
[New LWP 92412]
[New LWP 92411]
[New LWP 92410]
[New LWP 92409]
[New LWP 92408]
[New LWP 92407]
[New LWP 92406]
[New LWP 92405]
[New LWP 92404]
[New LWP 92403]
[New LWP 92402]
[New LWP 92401]
[New LWP 92400]
[New LWP 92399]
[New LWP 92398]
[New LWP 92397]
[New LWP 92396]
[New LWP 92395]
[New LWP 92394]
[New LWP 92393]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libexpat.so.1...(no debugging symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libcrypt.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libcrypt-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.21.so...done.
done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_compat.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_compat-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnsl.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnsl-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_nis.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_nis-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_files.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_files-2.21.so...done.
done.
Reading symbols from /usr/local/apache2/modules/mod_authn_file.so...done.
Reading symbols from /usr/local/apache2/modules/mod_authn_core.so...done.
Reading symbols from /usr/local/apache2/modules/mod_authz_host.so...done.
Reading symbols from /usr/local/apache2/modules/mod_authz_groupfile.so...done.
Reading symbols from /usr/local/apache2/modules/mod_authz_user.so...done.
Reading symbols from /usr/local/apache2/modules/mod_authz_core.so...done.
Reading symbols from /usr/local/apache2/modules/mod_access_compat.so...done.
Reading symbols from /usr/local/apache2/modules/mod_auth_basic.so...done.
Reading symbols from /usr/local/apache2/modules/mod_reqtimeout.so...done.
Reading symbols from /usr/local/apache2/modules/mod_filter.so...done.
Reading symbols from /usr/local/apache2/modules/mod_mime.so...done.
Reading symbols from /usr/local/apache2/modules/mod_log_config.so...done.
Reading symbols from /usr/local/apache2/modules/mod_env.so...done.
Reading symbols from /usr/local/apache2/modules/mod_headers.so...done.
Reading symbols from /usr/local/apache2/modules/mod_setenvif.so...done.
Reading symbols from /usr/local/apache2/modules/mod_version.so...done.
Reading symbols from /usr/local/apache2/modules/mod_unixd.so...done.
Reading symbols from /usr/local/apache2/modules/mod_status.so...done.
Reading symbols from /usr/local/apache2/modules/mod_autoindex.so...done.
Reading symbols from /usr/local/apache2/modules/mod_dir.so...done.
Reading symbols from /usr/local/apache2/modules/mod_alias.so...done.
Reading symbols from /lib/x86_64-linux-gnu/libgcc_s.so.1...(no debugging symbols found)...done.
do_sigwait (sig=0x7fffa2a35afc, set=<optimized out>)
    at ../sysdeps/unix/sysv/linux/sigwait.c:64
64	../sysdeps/unix/sysv/linux/sigwait.c: Nie ma takiego pliku ani katalogu.
(gdb) c
Continuing.
^C[Thread 0x7f4070fe9700 (LWP 92417) exited]
[Thread 0x7f40717ea700 (LWP 92416) exited]
[Thread 0x7f4071feb700 (LWP 92415) exited]
[Thread 0x7f40727ec700 (LWP 92414) exited]
[Thread 0x7f4072fed700 (LWP 92413) exited]
[Thread 0x7f40737ee700 (LWP 92412) exited]
[Thread 0x7f4073fef700 (LWP 92411) exited]
[Thread 0x7f40747f0700 (LWP 92410) exited]
[Thread 0x7f4074ff1700 (LWP 92409) exited]
[Thread 0x7f40757f2700 (LWP 92408) exited]
[Thread 0x7f4075ff3700 (LWP 92407) exited]
[Thread 0x7f40767f4700 (LWP 92406) exited]
[Thread 0x7f4076ff5700 (LWP 92405) exited]
[Thread 0x7f40777f6700 (LWP 92404) exited]
[Thread 0x7f4077ff7700 (LWP 92403) exited]
[Thread 0x7f40787f8700 (LWP 92402) exited]
[Thread 0x7f4078ff9700 (LWP 92401) exited]
[Thread 0x7f40797fa700 (LWP 92400) exited]
[Thread 0x7f4079ffb700 (LWP 92399) exited]
[Thread 0x7f407a7fc700 (LWP 92398) exited]
[Thread 0x7f407affd700 (LWP 92397) exited]
[Thread 0x7f407b7fe700 (LWP 92396) exited]
[Thread 0x7f407bfff700 (LWP 92395) exited]
[Thread 0x7f4080de9700 (LWP 92394) exited]
[Thread 0x7f40815ea700 (LWP 92393) exited]

Program received signal SIGHUP, Hangup.
[Switching to Thread 0x7f40707e8700 (LWP 92418)]
0x00007f40857fb743 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
81	../sysdeps/unix/syscall-template.S: Nie ma takiego pliku ani katalogu.
(gdb) c
Continuing.
[Thread 0x7f40707e8700 (LWP 92418) exited]
[Inferior 1 (process 92391) exited normally]
(gdb) c
The program is not being run.
(gdb)

Zainstalowałem inną wersję (2.2.22) tego serwera żeby zobaczyć czy to wina GDB czy ta wersja jest taka "felerna" Okazało się że to drugie:

GNU gdb (Ubuntu 7.10-1ubuntu2) 7.10
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) attach 2104
Attaching to process 2104
Reading symbols from /usr/local/apache2/bin/httpd...done.
Reading symbols from /usr/local/apache2/lib/libaprutil-1.so.0...done.
Reading symbols from /usr/local/apache2/lib/libapr-1.so.0...done.
Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libpthread-2.21.so...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libexpat.so.1...(no debugging symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libcrypt.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libcrypt-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.21.so...done.
done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_compat.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_compat-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnsl.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnsl-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_nis.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_nis-2.21.so...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libnss_files.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_files-2.21.so...done.
done.
0x00007f86e8e52387 in accept4 (fd=4, addr=..., addr_len=0x7ffe35c21c80, 
    flags=524288) at ../sysdeps/unix/sysv/linux/accept4.c:41
41	../sysdeps/unix/sysv/linux/accept4.c: Nie ma takiego pliku ani katalogu.
(gdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x00007f86e8e52387 in accept4 (fd=4, addr=..., addr_len=0x7ffe35c21c80, 
    flags=524288) at ../sysdeps/unix/sysv/linux/accept4.c:41
41	in ../sysdeps/unix/sysv/linux/accept4.c
(gdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x00007f86e8e52387 in accept4 (fd=4, addr=..., addr_len=0x7ffe35c21c80, 
    flags=524288) at ../sysdeps/unix/sysv/linux/accept4.c:41
41	in ../sysdeps/unix/sysv/linux/accept4.c
(gdb) 

Jak widać ta wersja poprawnie reaguje na Ctrl+C (reaguje SIGINT Interrupt'em i można bez problemu odpauzować). Jak to naprawić? Ma ktoś jakieś pomysły? Z góry dzięki!

0

Problem rozwiązany.
Było to spowodowane tym że GDB nie działał z Server MPM: event. Skompilowałem jeszcze raz z Preforkiem i działa.

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