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From bugzi...@apache.org
Subject [Bug 60439] Program terminated with signal SIGSEGV, Segmentation fault.
Date Thu, 29 Dec 2016 10:35:24 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=60439

--- Comment #9 from amd1212@vier-ringe.at ---
Hello,

Finally we have an coredump with all debugging symbols enabled.
Sorry for the long delay. We are not able to reproduce the segfault by now, we
have to wait for one. They appear not frequently.

Here is the backtrace, if more information is needed don't hesitate to ask.

GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 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"...
Reading symbols from /opt/loadbalancer/apache/bin/httpd...done.
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warning: Could not load shared library symbols for 2 libraries, e.g.
/lib/snoopy.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/opt/loadbalancer/apache/bin/httpd -k start'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  send_brigade_nonblocking (s=0x7fe19c0e1f08, bb=0x7fe1fc0e4370,
bytes_written=0x5, c=0x7fe1a4017168)
    at /opt/unpack/httpd-2.4.23/server/core_filters.c:664
664             if (!APR_BUCKET_IS_METADATA(bucket)) {
(gdb) info sharedlibrary
>From                To                  Syms Read   Shared Object Library
                                        No          linux-vdso.so.1
                                        No          /lib/snoopy.so
0x00007fe20a1720a0  0x00007fe20a187e60  Yes        
/opt/loadbalancer/pcre/lib/libpcre.so.1
0x00007fe209f53250  0x00007fe209f6774f  Yes        
/opt/loadbalancer/apr-util/lib/libaprutil-1.so.0
0x00007fe209d24b60  0x00007fe209d3cff9  Yes (*)    
/lib/x86_64-linux-gnu/libexpat.so.1
0x00007fe209afb9b0  0x00007fe209b15f14  Yes        
/opt/loadbalancer/apr/lib/libapr-1.so.0
0x00007fe2098e9350  0x00007fe2098ec06c  Yes        
/lib/x86_64-linux-gnu/librt.so.1
0x00007fe2096b0cc0  0x00007fe2096b58b4  Yes        
/lib/x86_64-linux-gnu/libcrypt.so.1
0x00007fe2094989f0  0x00007fe2094a4771  Yes        
/lib/x86_64-linux-gnu/libpthread.so.0
0x00007fe20928fed0  0x00007fe20929097e  Yes        
/lib/x86_64-linux-gnu/libdl.so.2
0x00007fe208f034a0  0x00007fe20902f943  Yes        
/lib/x86_64-linux-gnu/libc.so.6
0x00007fe20a595ae0  0x00007fe20a5ae140  Yes         /lib64/ld-linux-x86-64.so.2
0x00007fe2038993b0  0x00007fe20389db4e  Yes        
/lib/x86_64-linux-gnu/libnss_compat.so.2
0x00007fe203684160  0x00007fe20368f693  Yes        
/lib/x86_64-linux-gnu/libnsl.so.1
0x00007fe2034771a0  0x00007fe20347d1bc  Yes        
/lib/x86_64-linux-gnu/libnss_nis.so.2
0x00007fe20326b2a0  0x00007fe203271ba3  Yes        
/lib/x86_64-linux-gnu/libnss_files.so.2
0x00007fe20681e0e0  0x00007fe20684d474  Yes (*)    
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
0x00007fe206603540  0x00007fe20660a4d2  Yes (*)    
/usr/lib/x86_64-linux-gnu/liblber-2.4.so.2
0x00007fe2063eca90  0x00007fe2063f8a76  Yes        
/lib/x86_64-linux-gnu/libresolv.so.2
0x00007fe2061d0310  0x00007fe2061e1293  Yes (*)    
/usr/lib/x86_64-linux-gnu/libsasl2.so.2
0x00007fe205ed4400  0x00007fe205f9093a  Yes (*)    
/usr/lib/x86_64-linux-gnu/libgnutls-deb0.so.28
0x00007fe205c95220  0x00007fe205ca6469  Yes (*)    
/lib/x86_64-linux-gnu/libz.so.1
0x00007fe205a5a4f0  0x00007fe205a76edc  Yes (*)    
/usr/lib/x86_64-linux-gnu/libp11-kit.so.0
0x00007fe20583bc80  0x00007fe205846a0b  Yes (*)    
/usr/lib/x86_64-linux-gnu/libtasn1.so.6
0x00007fe20560d360  0x00007fe2056295ca  Yes (*)    
/usr/lib/x86_64-linux-gnu/libnettle.so.4
0x00007fe2053deb60  0x00007fe2053e9676  Yes (*)    
/usr/lib/x86_64-linux-gnu/libhogweed.so.2
0x00007fe205161480  0x00007fe2051bf228  Yes (*)    
/usr/lib/x86_64-linux-gnu/libgmp.so.10
0x00007fe204f4e870  0x00007fe204f5301c  Yes (*)    
/usr/lib/x86_64-linux-gnu/libffi.so.6
0x00007fe203067d70  0x00007fe2030686a0  Yes        
/opt/loadbalancer/apr-util/lib/apr-util-1/apr_ldap-1.so
0x00007fe208ce2a20  0x00007fe208ce3389  Yes        
/opt/loadbalancer/apache/modules/mod_dumpio.so
0x00007fe208ae0db0  0x00007fe208ae15d6  Yes        
/opt/loadbalancer/apache/modules/mod_log_forensic.so
0x00007fe2088dec60  0x00007fe2088df1f5  Yes        
/opt/loadbalancer/apache/modules/mod_logio.so
0x00007fe2086c70d0  0x00007fe2086d5bae  Yes        
/opt/loadbalancer/apache/modules/mod_proxy.so
0x00007fe2084be1f0  0x00007fe2084bfcfc  Yes        
/opt/loadbalancer/apache/modules/mod_proxy_connect.so
0x00007fe2082b52f0  0x00007fe2082baddc  Yes        
/opt/loadbalancer/apache/modules/mod_proxy_ftp.so
0x00007fe2080ac6b0  0x00007fe2080b0ff8  Yes        
/opt/loadbalancer/apache/modules/mod_proxy_http.so
0x00007fe207ea0200  0x00007fe207ea607f  Yes        
/opt/loadbalancer/apache/modules/mod_proxy_balancer.so
0x00007fe207c9c740  0x00007fe207c9cbe8  Yes        
/opt/loadbalancer/apache/modules/mod_lbmethod_byrequests.so
0x00007fe207a9a740  0x00007fe207a9ac1e  Yes        
/opt/loadbalancer/apache/modules/mod_lbmethod_bybusyness.so
0x00007fe2078961c0  0x00007fe2078982db  Yes        
/opt/loadbalancer/apache/modules/mod_status.so
0x00007fe207688350  0x00007fe207690f53  Yes        
/opt/loadbalancer/apache/modules/mod_rewrite.so
0x00007fe207482fa0  0x00007fe2074839a8  Yes        
/opt/loadbalancer/apache/modules/mod_unixd.so
0x00007fe20727fe90  0x00007fe207280e78  Yes        
/opt/loadbalancer/apache/modules/mod_auth_basic.so
0x00007fe20707cdd0  0x00007fe20707d7cc  Yes        
/opt/loadbalancer/apache/modules/mod_authz_host.so
0x00007fe206e79ed0  0x00007fe206e7a652  Yes        
/opt/loadbalancer/apache/modules/mod_authn_core.so
0x00007fe206c75570  0x00007fe206c7713a  Yes        
/opt/loadbalancer/apache/modules/mod_authz_core.so
0x00007fe206a64620  0x00007fe206a6d29f  Yes        
/opt/loadbalancer/apache/modules/mod_ldap.so
0x00007fe204d41e00  0x00007fe204d48387  Yes        
/opt/loadbalancer/apache/modules/mod_authnz_ldap.so
0x00007fe204b3df50  0x00007fe204b3e942  Yes        
/opt/loadbalancer/apache/modules/mod_expires.so
0x00007fe2049397c0  0x00007fe20493b1ed  Yes        
/opt/loadbalancer/apache/modules/mod_headers.so
0x00007fe204732d40  0x00007fe20473589b  Yes        
/opt/loadbalancer/apache/modules/mod_log_config.so
0x00007fe20452faf0  0x00007fe20452fe6b  Yes        
/opt/loadbalancer/apache/modules/mod_env.so
0x00007fe20432c080  0x00007fe20432d7e6  Yes        
/opt/loadbalancer/apache/modules/mod_slotmem_shm.so
0x00007fe203ff2870  0x00007fe2040d501e  Yes (*)    
/usr/lib/x86_64-linux-gnu/libxml2.so.2
0x00007fe203da3850  0x00007fe203db8082  Yes (*)    
/lib/x86_64-linux-gnu/liblzma.so.5
0x00007fe203aa5580  0x00007fe203b10d96  Yes        
/lib/x86_64-linux-gnu/libm.so.6
                                        No         
/lib/x86_64-linux-gnu/libnss_sss.so.2
0x00007fe200232ab0  0x00007fe2002429a5  Yes (*)    
/lib/x86_64-linux-gnu/libgcc_s.so.1
0x00007fe20002b100  0x00007fe20002dff0  Yes        
/lib/x86_64-linux-gnu/libnss_dns.so.2
(*): Shared library is missing debugging information.
(gdb) bt full
#0  send_brigade_nonblocking (s=0x7fe19c0e1f08, bb=0x7fe1fc0e4370,
bytes_written=0x5, c=0x7fe1a4017168)
    at /opt/unpack/httpd-2.4.23/server/core_filters.c:664
        vec = {{iov_base = 0x7fe1c00c8ef8, iov_len = 7482}, {iov_base =
0x7fe1c00caf08, iov_len = 710}, {
            iov_base = 0x47c2ca, iov_len = 2}, {iov_base = 0x7fe19c0e2d68,
iov_len = 5}, {
            iov_base = 0x7fe194107208, iov_len = 8000}, {iov_base =
0x7fe19c0e18c8, iov_len = 110}, {
            iov_base = 0x47c2ca, iov_len = 2}, {iov_base = 0x7fe19c0e2548,
iov_len = 6}, {
            iov_base = 0x7fe1c00c0eb8, iov_len = 7882}, {iov_base =
0x7fe1a4006938, iov_len = 310}, {
            iov_base = 0x47c2ca, iov_len = 2}, {iov_base = 0x7fe19c0e2a48,
iov_len = 6}, {
            iov_base = 0x7fe1c00bae88, iov_len = 7682}, {iov_base =
0x7fe1940f7188, iov_len = 510}, {
            iov_base = 0x47c2ca, iov_len = 2}, {iov_base = 0x7fe19c0e24a8,
iov_len = 6}}
        nvec = 4
#1  0x00000000004491e1 in send_brigade_blocking (c=<optimized out>,
bytes_written=<optimized out>, 
    bb=<optimized out>, s=<optimized out>) at
/opt/unpack/httpd-2.4.23/server/core_filters.c:733
No locals.
#2  ap_core_output_filter (f=0x7fe19c0e1f08, new_bb=0x7fe1fc0e4370)
    at /opt/unpack/httpd-2.4.23/server/core_filters.c:542
        c = 0x7fe1fc0e3dd8
        bytes_in_brigade = 0
        non_file_bytes_in_brigade = 140606962540296
        eor_buckets_in_brigade = 5
        morphing_bucket_in_brigade = -662995824
#3  0x00000000004626b1 in ap_process_request (r=0x7fe194101230)
    at /opt/unpack/httpd-2.4.23/modules/http/http_request.c:451
        bb = 0x7fe1fc0e4370
        c = 0x7fe1fc0e3dd8
        rv = 48
#4  0x000000000045e9b5 in ap_process_http_sync_connection (c=0x7fe1fc0e3dd8)
    at /opt/unpack/httpd-2.4.23/modules/http/http_core.c:210
        keep_alive_timeout = 5000000
        r = 0x7fe194101230
        cs = 0x0
        csd = 0x0
        mpm_state = 0
#5  ap_process_http_connection (c=0x7fe1fc0e3dd8) at
/opt/unpack/httpd-2.4.23/modules/http/http_core.c:251
No locals.
#6  0x0000000000456d30 in ap_run_process_connection (c=0x7fe1fc0e3dd8)
    at /opt/unpack/httpd-2.4.23/server/connection.c:42
        pHook = <optimized out>
        n = 0
        rv = -1
#7  0x0000000000468f81 in process_socket (bucket_alloc=<optimized out>,
my_thread_num=<optimized out>, 
    my_child_num=<optimized out>, sock=<optimized out>, p=<optimized out>,
thd=<optimized out>)
    at /opt/unpack/httpd-2.4.23/server/mpm/worker/worker.c:631
        current_conn = 0x7fe1fc0e3dd8
        conn_id = 140608573160920
        sbh = 0x7fe1fc0e3dd0
#8  worker_thread (thd=0x7fe19c0e1f08, dummy=0x7fe1d87b7c90)
    at /opt/unpack/httpd-2.4.23/server/mpm/worker/worker.c:992
        process_slot = 19
        thread_slot = 74
        csd = 0x7fe1fc0e3bc0
        bucket_alloc = 0x9
        last_ptrans = 0x7fe1fc0e3dd8
        ptrans = 0x7fe1fc0e3b38
        is_idle = -66176064
#9  0x00007fe20949b0a4 in start_thread (arg=0x7fe1d87b8700) at
pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe1d87b8700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140607976343296,
7960264032231149677, 0, 140608815194208, 152, 
                140607976343296, -7945694442286690195, -7945304783828627347},
mask_was_saved = 0}}, priv = {pad = {
              0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#10 0x00007fe208fcc62d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb)




best regards,
Stefan

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