A bozo's blog: debug

Showing posts with label debug. Show all posts

Thursday, February 2, 2012

PHP debugging

French article on how to debug PHP with the Xdebug extension.

Monday, July 18, 2011

gprof enabling

Add the ”-pg” option to every .o compilation + to the exe also.

Link with static versions of libraries that need being profiled.

Example given:

cd /vob/signalware/Master/scos
swmake gprof

cd /vob/signalware/Master/test/tcap/c7
rm /vob/signalware/Master/library/libscos.so
clearmake -V "PROT_FLAGS=-DC7_Q" gprof

Then running c7icptrans should produce a gmon.out.

To extract the information from gmon.out, use gprof:

gprof /export/home/omni_9S5/bin/test/c7icptrans gmon.out > gprof.txt

Trace system calls from libFt in is41tst32

truss -u libFt:: /export/home/omni/bin/is41tst32 -debug -alone -node A71 -prot A7 -lpc 1-85-2 -rpc 1-85-2 -lssn -rssn 6 -ninvoke 200 0xffff

Example use

# mdb -k
Loading modules: [ unix krtld genunix ip usba logindmux ptm cpc ipc random nfs ]
> ::queue -v -m c7m3uart
0000030026cc1d30
> 0000030026cc1d30::q2stream
30026c5c940
> 30026c5c940::stream

+-----------------------+-----------------------+
| 0x30026cc8478         | 0x30026cc8388         |
| mom                   | mom                   |
|                       |                       |
| cnt = 0t0             | cnt = 0t0             |
| flg = 0x00004022      | flg = 0x00044032      |
+-----------------------+-----------------------+
            |                       ^
            v                       |
+-----------------------+-----------------------+
| 0x30026cc13e0         | 0x30026cc12f0         |
| c7tcap                | c7tcap                |
|                       |                       |
| cnt = 0t0             | cnt = 0t0             |
| flg = 0x00004022      | flg = 0x00004032      |
+-----------------------+-----------------------+
            |                       ^
            v                       |
+-----------------------+-----------------------+
| 0x30026cc0c30         | 0x30026cc0b40         |
| c7sccp                | c7sccp                |
|                       |                       |
| cnt = 0t0             | cnt = 0t0             |
| flg = 0x00004022      | flg = 0x00004032      |
+-----------------------+-----------------------+
            |                       ^
            v                       |
+-----------------------+-----------------------+
| 0x30026cc1e20         | 0x30026cc1d30         |
| c7m3uart              | c7m3uart              |
|                       |                       |
| cnt = 0t0             | cnt = 0t0             |
| flg = 0x00004022      | flg = 0x00004032      |
+-----------------------+-----------------------+
            |                       ^
            v                       |
+-----------------------+-----------------------+
| 0x30026cc81e8         | 0x30026cc80f8         |
| lom_                  | lom_                  |
|                       |                       |
| cnt = 0t0             | cnt = 0t0             |
| flg = 0x00244022      | flg = 0x00204032      |
+-----------------------+-----------------------+
>

Redirect umalog output to a file:

echo ::umalog | mdb core.21878 > umalog.txt

watchmalloc how to (sangria)

Very slow!

cd /usr/lib/secure/64
suidwrap ln -s /usr/lib/64/watchmalloc.so.1
export LD_PRELOAD_64=/usr/lib/secure/64/watchmalloc.so.1
export MALLOC_DEBUG=WATCH,RW

libumem how to (sangria)

Requires Solaris 9 update 3, and above.

cd /usr/lib/secure/64
suidwrap ln -s /usr/lib/64/libumem.so.1

Then,

export LD_PRELOAD_64=/usr/lib/secure/64/libumem.so.1 
export UMEM_DEBUG=default
export UMEM_LOGGING=transaction
go.omni
gcore `pid guiserver`

If core “core.15604” is dumped, then

mdb core.15604

Memory leaks / Memory corruption

Generalities: Alternate Methods of Debugging
libumem: libumem
or, libumem: libumem

PM sig_segv

 $ gdb
 (gdb) file /vob/signalware/Master/pm/pm  |
 Reading symbols from /vob/signalware/Master/pm/pm...done.
 (gdb) attach 26427
 Attaching to program `/vob/signalware/Master/pm/pm', process 26427
 Reading symbols from /usr/lib/sparcv9/omni/libdgms.so...done.
 Loaded symbols for /usr/lib/sparcv9/omni/libdgms.so
 ...  
 sol-thread active.
 Retry #1:
 Retry #2:
 Retry #3:
 Retry #4:
 [New LWP    1        ]
 [New Thread 1 (LWP 1)]
 Symbols already loaded for /usr/lib/sparcv9/omni/libdgms.so
 ...
 [Switching to Thread 1 (LWP 1)]
 0xffffffff7d7a677c in _poll () from /usr/lib/64/libc.so.1
 (gdb) handle SIGSEGV stop print
 Signal        Stop      Print   Pass to program Description
 SIGSEGV       Yes       Yes     Yes             Segmentation fault
 (gdb) cont
 Continuing.
 Program received signal SIGSEGV, Segmentation fault.
 0xffffffff7d73d28c in strlen () from /usr/lib/64/libc.so.1
 (gdb) bt
 #0  0xffffffff7d73d28c in strlen () from /usr/lib/64/libc.so.1
 #1  0xffffffff7d790308 in _doprnt () from /usr/lib/64/libc.so.1
 #2  0xffffffff7d792538 in vsprintf () from /usr/lib/64/libc.so.1
 #3  0xffffffff7e71b624 in FtFormatInternationalMsg (catd=0x10075fa50, set_number=45, message_number=109, 
     defaultString=0xffffffff7c321a0f "M  DENY\n  %s\n  %s\n", 
     destMsgBuf=0x100186380 "M  DENY\n  +------+\n| INFO |  Acquiring lock on addDelNode.lock.6981\n+------+\n/export/home/omni/bin/DFcat addDelNode.lock.6981 2>&1\n/export/home/omni/bin/DFconvert /tmp/addDelNode.lock.6981\n\n+------+\n|"..., sizeDestMsgBuf=4096)
     at ../lib_util.c:1740
 #4  0x0000000100010a14 in DoCreateNode (pcmd=0x100624a10) at pm.c:5333
 #5  0x0000000100034980 in yyparse () at parse.y:1026
 #6  0x000000010003acf4 in parseMML () at nlex.l:1024
 #7  0x0000000100037620 in process_mml_cmd () at parse.y:2399
 #8  0x000000010000a760 in main (argc=7672264, argv=0x100624e18) at pm.c:1555
 (gdb) quit

Ignore SIGUSR2 signals

This command will prevent your program from stopping whenever it receives a SIGUSR2 but will print it anyway.

(gdb) handle SIGUSR2 nostop noprint

This is useful in JGUI Server to prevent gdb from being stopped by SIG_CPT.

Ignore SIGALRM in single-stepping

To ignore SIGALRM signals while single-stepping, but treat them normally during normal execution, you could define:

define hook-stop
handle SIGALRM nopass
end

define hook-run
handle SIGALRM pass
end

define hook-continue
handle SIGLARM pass
end

NB: recorded in ~gallinar/.gdbinit, which is read automatically by gdb if gallinar or which can be sourced (within gdb) if root.

Installing gdb

On-line doc

Excerpt:

 CC="gcc -m64" ./configure --prefix=/u/engineering/locals/solaris10/softs/proglang/gdb-6.6
 make
 make install

Compilation errors:

rm -f gdb
gcc -g -O2       \
        -o gdb gdb.o libgdb.a \
           ../readline/libreadline.a ../opcodes/libopcodes.a ../bfd/libbfd.a ./../intl/libintl.a ../libiberty/libiberty.a      -ldl -lncurses -lsocket -lnsl -lm      ../libiberty/libiberty.a  
Undefined                       first referenced
 symbol                             in file
initscr32                           libgdb.a(tui.o)
w32addch                            libgdb.a(tui-io.o)
w32attron                           libgdb.a(tui-wingeneral.o)
w32attroff                          libgdb.a(tui-wingeneral.o)
acs32map                            libgdb.a(tui-win.o)
ld: fatal: Symbol referencing errors. No output written to gdb

To solve it:

cd /usr/ccs/lib
ln -s /usr/ccs/lib/libcurses.so libncurses.so

valgrind: failed to start tool memcheck for platform amd64-linux: No such file or directory

valgrind was not able to find memcheck.

Solution: Put in VALGRIND_LIB the parent directory of amd64-linux directory.
E.g.:

export VALGRIND_LIB=/u/gallinar/downloaded/valgrind-3.2.3/.in_place

Example run

/u/engineering/locals/linux/bin/valgrind --leak-check=yes --show-reachable=yes --num-callers=16 --quiet $OMNI_HOME/bin/MonControl -filetype pcap -enable C7_L3MTP 2>&1 | tee MonControl.log