Re: [PHP-DEV] PHP 4.0 Bug #5615: SIGSEGV combining PHP/OCI8/SSL From: Rasmus Lerdorf (rasmus <email protected>)
Date: 07/15/00

You need to either link libpthreads into Apache, or use the Oracle 8.0.5
libs which don't appear to have this problem. It boils down to a
glibc-2.1.x bug.

-Rasmus

On 15 Jul 2000 greg <email protected> wrote:

> From: greg <email protected>
> Operating system: Linux RedHat 6.2
> PHP version: 4.0.1pl2
> PHP Bug Type: Reproduceable crash
> Bug description: SIGSEGV combining PHP/OCI8/SSL
>
> We're observing silent crashes combining Apache+Mod_SSL+EasySoft+OCI8 as DSO's
>
> Attempting to build all modules as DSO's, included modules: default Apache, rewrite, mod_ssl, php4.
>
> Observed problem: SIGSEGV, segmentation fault deep in PHP code, modf() calls when first loading Apache.
>
>
>
> Various combinations and results:
> 1. Configure Apache-mods (DSO), SSL (DSO), PHP/oci8 (DSO). Problem = Described above--SIGSEGV. (GDBM trace provided)
>
> 2. Configure Apache-mods (DSO), SSL (DSO), PHP (DSO), remove OCI8. Apache works fine.
>
> 3. Configure Apache-mods (static), SSL (DSO), PHP/oci8 (DSO). Problem = Apache loads and responds to requests, including Easysoft and Oracle. However, when sending a sigHUP (reload) to Apache a similar SIGSEGV fault happens (2nd GDBM trace provided).
>
> 4. Configure Apache-mods (static), SSL (static), PHP/oci8 (DSO). Problem = same as #3. Works but crashes on sigHUP.
>
> 5. Configure Apache-mods (DSO), PHP/oci8 (DSO), eliminate SSL. Apache works fine, DB's work fine.
>
> 6. Configure Apache-mods (static), PHP/oci8 (DSO), eliminate SSL. Works fine also.
>
>
> Have tried many variations on PHP configuration switches with no variation in the observed results. Have not seriously considered compiling PHP statically due to its 2MB+ size and resulting performance hit.
>
> Looking at the GDB trace, it's obvious values are getting clobbered in some kind of memory/buffer overrun. Removing SSL or OCI8 eliminates the problem, yet the traces don't suggest any specific interaction problems. It looks more like some memory management problem/conflict.
>
>
>
> *****Apache 1.3.12 Config (all modules DSO):*****
>
> OPTIM="-g -ggdb3" \
> LDFLAGS="-lpthread" \
> SSL_BASE="/home/gpaul/packages/openssl-0.9.5" \
> RSA_BASE="/home/gpaul/packages/rsaref-2.0/local" \
> ./configure \
> "--with-layout=Apache" \
> "--with-perl=/usr/bin/perl" \
> "--enable-module=rewrite" \
> "--enable-module=ssl" \
> "--enable-shared=ssl" \
> "--enable-shared=max" \
> "--enable-module=so" \
> "--prefix=/usr/local/apache" \
> "--disable-rule=SSL_COMPAT" \
>
>
> *****PHP 4.0.1pl2 Config:*****
>
> ./configure \
> --enable-xml \
> --enable-wddx \
> --with-esoob=/usr/local/easysoft/oob/client \
> --enable-track-vars \
> --enable-magic-quotes \
> --with-apxs=/usr/local/apache/bin/apxs \
> --with-config-file-path=/usr/local/apache/conf \
> --enable-sigchild \
> --with-gnu-ld \
> --with-oci8=/home/oracle \
> --enable-shared \
> --libexecdir=/usr/local/apache/libexec
>
>
>
> *****GDBM Crash Trace with all modules configured as DSO:*****
>
> (gdb) run -X -DSSL
> Starting program: /usr/local/apache/bin/httpd -X -DSSL
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x403ceb90 in modf () from /usr/local/apache/libexec/libphp4.so
> (gdb) bt
> #0 0x403ceb90 in modf () from /usr/local/apache/libexec/libphp4.so
> #1 0x8072977 in ap_cvt (arg=47.640187918506648, ndigits=0, decpt=0xbffff708,
> sign=0xbffff77c, eflag=-1073744200, buf=0x402e19b0 "Ø£\r")
> at ap_snprintf.c:144
> #2 0x8072c47 in ap_fcvt (arg=47.640187918506648, ndigits=0, decpt=0xbffff708,
> sign=0xbffff77c, buf=0xbffff6b8 "\034ø¿\eøÃ") at ap_snprintf.c:209
> #3 0x807330b in conv_fp (format=102 'f', num=47.640187918506648, add_dp=NO,
> precision=0, is_negative=0xbffff77c,
> buf=0xbffff79d "=\032@\002#\002@< \002 <email protected>\032@`=\032 <email protected>\r@\001",
> len=0xbffff9c8) at ap_snprintf.c:516
> #4 0x8073f94 in ap_vformatter (flush_func=0x807464c <snprintf_flush>,
> vbuff=0xbffff9e8, fmt=0x402c4b31 "f", ap=0xbffffa14) at ap_snprintf.c:930
> #5 0x8074698 in ap_snprintf (
> buf=0xbffffa20 "\213\227^ÌEz;D\022\205Œ}Ö6\223¤ì\eÃã¹d' <email protected>ú¿\004", len=50,
> format=0x402c4b2e "%.0f") at ap_snprintf.c:1164
> #6 0x4023ebf4 in ssl_io_data_cb (bio=0x0, cmd=127, argp=0x402e19b0 "Ø£\r",
> argi=1073786464, argl=17484, rc=963629086) at ssl_engine_io.c:693
> #7 0x4023e98e in ssl_io_data_dump (srvr=0x80b6cc4,
> s=0x80b6c9c "\220l\013\b¤Y\017\b `\017\b", len=1) at ssl_engine_io.c:662
> #8 0x40239e67 in ssl_init_ConfigureServer (s=0x80b6cc4, p=0x80b6c9c,
> sc=0x401a51ec) at ssl_engine_init.c:713
> #9 0x8056db9 in ap_init_modules (p=0x80b6c9c, s=0x80b6cc4)
> at http_config.c:1568
> #10 0x8060835 in standalone_main (argc=3, argv=0xbffffca4) at http_main.c:4719
> #11 0x8061053 in main (argc=3, argv=0xbffffca4) at http_main.c:5092
> (gdb)
>
>
>
>
> *****GDBM Crash Trace with only SSL and PHP configured as DSO when a sigHUP is receieved:*****
>
> Attaching to program: /usr/local/apache/bin/httpd, Pid 12299
> Reading symbols from /lib/libpthread.so.0...done.
> Reading symbols from /lib/libm.so.6...done.
> Reading symbols from /lib/libcrypt.so.1...done.
> Reading symbols from /lib/libdb.so.3...done.
> Reading symbols from /lib/libdl.so.2...done.
> Reading symbols from /lib/libc.so.6...done.
> Reading symbols from /lib/ld-linux.so.2...done.
> Reading symbols from /lib/libresolv.so.2...done.
> Reading symbols from /lib/libnss_files.so.2...done.
> Reading symbols from /lib/libnss_dns.so.2...done.
> Reading symbols from /usr/local/apache/libexec/libssl.so...done.
> Reading symbols from /usr/local/apache/libexec/libphp4.so...done.
> Reading symbols from /usr/lib/libgdbm.so.2...done.
> Reading symbols from /usr/local/easysoft/oob/client/libesoobclient.so...done.
> Reading symbols from /lib/libpam.so.0...done.
> Reading symbols from /home/oracle/lib/libclntsh.so.1.0...done.
> ---Type <return> to continue, or q <return> to quit---
> Reading symbols from /usr/lib/libttf.so.2...done.
> Reading symbols from /usr/lib/libgd.so.1...done.
> Reading symbols from /lib/libnsl.so.1...done.
> Reading symbols from /usr/local/easysoft/lib/libesrpc.so...done.
> Reading symbols from /usr/local/easysoft/lib/libsupport.so...done.
> Reading symbols from /usr/local/easysoft/lib/libextra.so...done.
> 0x4016217e in __select () from /lib/libc.so.6
> (gdb) c
> Continuing.
>
> Program received signal SIGHUP, Hangup.
> 0x4016217e in __select () from /lib/libc.so.6
> (gdb) c
> Continuing.
>
> Program received signal SIGHUP, Hangup.
> 0x400d3d41 in __kill () from /lib/libc.so.6
> (gdb) c
> Continuing.
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x40370b90 in modf () from /usr/local/apache/libexec/libphp4.so
> (gdb) bt
> #0 0x40370b90 in modf () from /usr/local/apache/libexec/libphp4.so
> #1 0x8094c87 in ap_cvt (arg=112.64734500211074, ndigits=0, decpt=0xbffff738,
> sign=0xbffff7ac, eflag=-1073744152, buf=0x402839b0 "Ø£\r")
> at ap_snprintf.c:144
> #2 0x8094f57 in ap_fcvt (arg=112.64734500211074, ndigits=0, decpt=0xbffff738,
> sign=0xbffff7ac, buf=0xbffff6e8 "Lø¿KøÃ") at ap_snprintf.c:209
> #3 0x809561b in conv_fp (format=102 'f', num=112.64734500211074, add_dp=NO,
> precision=0, is_negative=0xbffff7ac,
> buf=0xbffff7cd "=\032@\002#\002@< \002 <email protected>\032@`=\032 <email protected>\r@\001",
> len=0xbffff9f8) at ap_snprintf.c:516
> #4 0x80962a4 in ap_vformatter (flush_func=0x809695c <snprintf_flush>,
> vbuff=0xbffffa18, fmt=0x40266b31 "f", ap=0xbffffa44) at ap_snprintf.c:930
> #5 0x80969a8 in ap_snprintf (
> buf=0xbffffa50 "\226*Œ>µÎµ\ex\230\002»\210AªÈÚRGä¹\204!@ ú¿\004", len=50,
> format=0x40266b2e "%.0f") at ap_snprintf.c:1164
> #6 0x401e0bf4 in ssl_io_data_cb (bio=0x0, cmd=127, argp=0x402839b0 "Ø£\r",
> argi=1073786464, argl=12299, rc=963630078) at ssl_engine_io.c:693
> #7 0x401e098e in ssl_io_data_dump (srvr=0x80e4ee4,
> s=0x80e4ebc "°N\016\bh¢\021\btÁ\021\b", len=1) at ssl_engine_io.c:662
> #8 0x401dbe67 in ssl_init_ConfigureServer (s=0x80e4ee4, p=0x80e4ebc,
> sc=0x401a51ec) at ssl_engine_init.c:713
> #9 0x80790c9 in ap_init_modules (p=0x80e4ebc, s=0x80e4ee4)
> at http_config.c:1568
> #10 0x8082b45 in standalone_main (argc=2, argv=0xbffffcd4) at http_main.c:4719
> #11 0x8083363 in main (argc=2, argv=0xbffffcd4) at http_main.c:5092
> (gdb)
>
>
>
> 

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