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Which version of curl libraries is your php compiled with?

libcurl 7.9.8
Error was also in 7.9.7
I don't know for earlier versions.

Sample php script:
<?
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL,"http://www.google.com");
curl_setopt ($ch, CURLOPT_POST, 1);
curl_exec($ch);
?>

strace info snippet:
send(3, "POST / HTTP/1.1\r\nHost: www.googl"..., 193, 0) = 193
gettimeofday({1025268846, 532533}, NULL) = 0
gettimeofday({1025268846, 532555}, NULL) = 0
select(4, [3], [3], NULL, {1, 0})       = 1 (out [3], left {1, 0})
gettimeofday({1025268846, 532760}, NULL) = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

Here is the back trace:
(gdb) bt
#0  0x404e2016 in _IO_fread (buf=0x82bd9d9, size=1, count=20480, fp=0x0)
    at iofread.c:42
#1  0x0808248c in curl_read (data=0x82bd9d9 "", size=1, nmemb=20480, 
    ctx=0x82b771c) at curl.c:350
#2  0x4031d190 in Curl_readwrite (conn=0x82b7b10, done=0xbfffdc2f "")
    at transfer.c:808
#3  0x4031d9ca in Transfer (conn=0x82b7b10) at transfer.c:1093
#4  0x4031ddc6 in Curl_perform (data=0x82b8380) at transfer.c:1180
#5  0x4031e176 in curl_easy_perform (curl=0x82b8380) at easy.c:245
#6  0x08083972 in zif_curl_exec (ht=1, return_value=0x82b7964, this_ptr=0x0, 
    return_value_used=0) at curl.c:876
#7  0x08150440 in execute (op_array=0x82b3134) at ./zend_execute.c:1598
#8  0x08129cc2 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at zend.c:810
#9  0x08075351 in php_execute_script (primary_file=0xbffffa40) at main.c:1381
#10 0x0807335c in main (argc=2, argv=0xbffffae4) at cgi_main.c:778
#11 0x4048c627 in __libc_start_main (main=0x8072b54 <main>, argc=2, 
    ubp_av=0xbffffae4, init=0x8070864 <_init>, fini=0x81a9030 <_fini>, 
    rtld_fini=0x4000dcc4 <_dl_fini>, stack_end=0xbffffadc)
    at ../sysdeps/generic/libc-start.c:129

(gdb) frame 0
#0  0x404e2016 in _IO_fread (buf=0x82bd9d9, size=1, count=20480, fp=0x0)
    at iofread.c:42
42      in iofread.c
(gdb) frame 1
#1  0x0808248c in curl_read (data=0x82bd9d9 "", size=1, nmemb=20480, 
    ctx=0x82b771c) at curl.c:350
350     curl.c:  No such file or directory.
        in curl.c

(gdb) frame 7
#7  0x08150440 in execute (op_array=0x82b3134) at ./zend_execute.c:1598
1598    ./zend_execute.c: No such file or directory.
        in ./zend_execute.c

Doesn't segfault for me with PHP 4.3.0-dev and curl 7.9.5.
Can you please try the latest snapshot:

http://snaps.php.net/php4-latest.tar.gz

(with your installed curl library)

This might be related to http://bugs.php.net/bug.php?id=17240 . The cURL's author of reported the problem solved in 7.9.8. From the backtrace it sure looks like the problem is in libcurl.

still no feedback..

Not a php bug, and its fixed in cURL.