root@ip-10-73-139-251:/home/cc/test# gdb /usr/local/openresty/nginx/sbin/nginx cores/core 
GNU gdb (GDB) 7.6.1-ubuntu
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-linux-gnu".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/openresty/nginx/sbin/nginx...done.
[New LWP 26149]

warning: Can't read pathname for load map: Input/output error.

warning: Could not load shared library symbols for ?z.
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 `nginx: worker process                                                      '.
Program terminated with signal 11, Segmentation fault.
#0  _int_malloc (av=0x7f57a71e4740 <main_arena>, bytes=<optimized out>) at malloc.c:3680
3680    malloc.c: No such file or directory.
(gdb) bt
#0  _int_malloc (av=0x7f57a71e4740 <main_arena>, bytes=<optimized out>) at malloc.c:3680
#1  0x00007f57a6ea64d0 in __GI___libc_malloc (bytes=136) at malloc.c:2859
#2  0x000000000042e229 in ngx_alloc (size=size@entry=136, log=0x17aa288) at src/os/unix/ngx_alloc.c:22
#3  0x00000000004262bf in ngx_resolver_alloc (r=r@entry=0x17be8a0, size=size@entry=136) at src/core/ngx_resolver.c:2081
#4  0x0000000000426496 in ngx_resolver_calloc (r=r@entry=0x17be8a0, size=size@entry=136) at src/core/ngx_resolver.c:2094
#5  0x0000000000426b08 in ngx_resolve_start (r=0x17be8a0, temp=temp@entry=0x7ffffb86f950) at src/core/ngx_resolver.c:295
#6  0x0000000000455aad in ngx_http_upstream_init_request (r=r@entry=0x17ae758) at src/http/ngx_http_upstream.c:624
#7  0x00000000004561d0 in ngx_http_upstream_init (r=0x17ae758) at src/http/ngx_http_upstream.c:466
#8  0x000000000044c061 in ngx_http_read_client_request_body (r=r@entry=0x17ae758, post_handler=0x456167 <ngx_http_upstream_init>) at src/http/ngx_http_request_body.c:54
#9  0x0000000000471da6 in ngx_http_proxy_handler (r=0x17ae758) at src/http/modules/ngx_http_proxy_module.c:704
#10 0x000000000043fce6 in ngx_http_core_content_phase (r=0x17ae758, ph=<optimized out>) at src/http/ngx_http_core_module.c:1419
#11 0x000000000043afc3 in ngx_http_core_run_phases (r=0x17ae758) at src/http/ngx_http_core_module.c:899
#12 0x000000000043b0d2 in ngx_http_handler (r=<optimized out>) at src/http/ngx_http_core_module.c:882
#13 0x0000000000443085 in ngx_http_run_posted_requests (c=c@entry=0x7f57a8828190) at src/http/ngx_http_request.c:2175
#14 0x0000000000444d23 in ngx_http_process_request (r=r@entry=0x17b4fd0) at src/http/ngx_http_request.c:1858
#15 0x0000000000445087 in ngx_http_process_request_headers (rev=rev@entry=0x17d0260) at src/http/ngx_http_request.c:1287
#16 0x0000000000445349 in ngx_http_process_request_line (rev=rev@entry=0x17d0260) at src/http/ngx_http_request.c:966
#17 0x000000000044567a in ngx_http_wait_request_handler (rev=0x17d0260) at src/http/ngx_http_request.c:487
#18 0x0000000000432e3b in ngx_epoll_process_events (cycle=<optimized out>, timer=<optimized out>, flags=<optimized out>) at src/event/modules/ngx_epoll_module.c:683
#19 0x000000000042ba60 in ngx_process_events_and_timers (cycle=cycle@entry=0x17aa270) at src/event/ngx_event.c:249
#20 0x0000000000431836 in ngx_worker_process_cycle (cycle=0x17aa270, data=<optimized out>) at src/os/unix/ngx_process_cycle.c:813
#21 0x00000000004301c6 in ngx_spawn_process (cycle=cycle@entry=0x17aa270, proc=proc@entry=0x43176a <ngx_worker_process_cycle>, data=data@entry=0x0, 
    name=name@entry=0x4c41fb "worker process", respawn=respawn@entry=-3) at src/os/unix/ngx_process.c:198
#22 0x000000000043198f in ngx_start_worker_processes (cycle=cycle@entry=0x17aa270, n=1, type=type@entry=-3) at src/os/unix/ngx_process_cycle.c:364
#23 0x0000000000431fed in ngx_master_process_cycle (cycle=cycle@entry=0x17aa270) at src/os/unix/ngx_process_cycle.c:136

#24 0x000000000041720a in main (argc=<optimized out>, argv=<optimized out>) at src/core/nginx.c:412
(gdb) backtrace full
#0  _int_malloc (av=0x7f57a71e4740 <main_arena>, bytes=<optimized out>) at malloc.c:3680
        p = <optimized out>
        iters = <optimized out>
        nb = 144
        idx = <optimized out>
        bin = <optimized out>
        victim = 0x17b60f0
        size = 24838432
        victim_index = <optimized out>
        remainder = 0x17b6180
        remainder_size = 24838288
        block = <optimized out>
        bit = <optimized out>
        map = <optimized out>
        fwd = 0x17b6180
        bck = 0x7f57a71e4798 <main_arena+88>
        errstr = 0x0
        __func__ = "_int_malloc"
#1  0x00007f57a6ea64d0 in __GI___libc_malloc (bytes=136) at malloc.c:2859
        ar_ptr = 0x7f57a71e4740 <main_arena>
        victim = 0x7f57a71e4740 <main_arena>
        __func__ = "__libc_malloc"
#2  0x000000000042e229 in ngx_alloc (size=size@entry=136, log=0x17aa288) at src/os/unix/ngx_alloc.c:22
        p = <optimized out>
#3  0x00000000004262bf in ngx_resolver_alloc (r=r@entry=0x17be8a0, size=size@entry=136) at src/core/ngx_resolver.c:2081
        p = 0x17b6180 ""
#4  0x0000000000426496 in ngx_resolver_calloc (r=r@entry=0x17be8a0, size=size@entry=136) at src/core/ngx_resolver.c:2094
        p = <optimized out>
#5  0x0000000000426b08 in ngx_resolve_start (r=0x17be8a0, temp=temp@entry=0x7ffffb86f950) at src/core/ngx_resolver.c:295
        addr = <optimized out>
        ctx = <optimized out>
#6  0x0000000000455aad in ngx_http_upstream_init_request (r=r@entry=0x17ae758) at src/http/ngx_http_upstream.c:624
        host = 0x17b0598
        i = <optimized out>
        ctx = <optimized out>
        temp = {next = 0x0, resolver = 0x408bdf68, udp_connection = 0x408ccb10, ident = 7275936, state = 0, type = 1082905464, name = {len = 9, data = 0x17b0587 "nginx.org/hL"}, 
          naddrs = 1082905464, addrs = 0x7f57a8654c75 <_dl_fixup+245>, addr = 1, handler = 0x0, data = 0x7ffffb86f9f0, timeout = 24831832, quick = 24934536, recursion = 4517762, 
          event = 0x17c7888}
        cln = <optimized out>
        u = 0x17b0138
        clcf = 0x17c5c98
        uscf = <optimized out>
        uscfp = 0x17ac400
        umcf = <optimized out>
#7  0x00000000004561d0 in ngx_http_upstream_init (r=0x17ae758) at src/http/ngx_http_upstream.c:466
        c = 0x7f57a8828190
#8  0x000000000044c061 in ngx_http_read_client_request_body (r=r@entry=0x17ae758, post_handler=0x456167 <ngx_http_upstream_init>) at src/http/ngx_http_request_body.c:54
        preread = <optimized out>
        size = <optimized out>
        rc = <optimized out>
        b = <optimized out>
        out = {buf = 0x17ae758, next = 0x17ae758}
        cl = <optimized out>
        rb = <optimized out>
#9  0x0000000000471da6 in ngx_http_proxy_handler (r=0x17ae758) at src/http/modules/ngx_http_proxy_module.c:704
        rc = <optimized out>
        u = 0x17b0138
        ctx = 0x17b04e0
        plcf = 0x17c60c8
#10 0x000000000043fce6 in ngx_http_core_content_phase (r=0x17ae758, ph=<optimized out>) at src/http/ngx_http_core_module.c:1419
        root = 24858680
        rc = <optimized out>
        path = {len = 24820544, data = 0x43eea4 <ngx_http_core_generic_phase+15> "H\211\306H\205\300u\024H\213E\020H\211\203\330\003"}
#11 0x000000000043afc3 in ngx_http_core_run_phases (r=0x17ae758) at src/http/ngx_http_core_module.c:899
        rc = <optimized out>
        ph = 0x17cd850
        cmcf = <optimized out>
#12 0x000000000043b0d2 in ngx_http_handler (r=<optimized out>) at src/http/ngx_http_core_module.c:882
        cmcf = <optimized out>
#13 0x0000000000443085 in ngx_http_run_posted_requests (c=c@entry=0x7f57a8828190) at src/http/ngx_http_request.c:2175
        r = <optimized out>
        ctx = <optimized out>
        pr = <optimized out>
#14 0x0000000000444d23 in ngx_http_process_request (r=r@entry=0x17b4fd0) at src/http/ngx_http_request.c:1858
        c = 0x7f57a8828190
#15 0x0000000000445087 in ngx_http_process_request_headers (rev=rev@entry=0x17d0260) at src/http/ngx_http_request.c:1287
        p = <optimized out>
        len = <optimized out>
---Type <return> to continue, or q <return> to quit---
        n = <optimized out>
        rc = <optimized out>
        rv = <optimized out>
        h = <optimized out>
        c = 0x7f57a8828190
        hh = <optimized out>
        r = 0x17b4fd0
        cscf = 0x17c0f00
        cmcf = 0x17abb00
#16 0x0000000000445349 in ngx_http_process_request_line (rev=rev@entry=0x17d0260) at src/http/ngx_http_request.c:966
        n = <optimized out>
        rc = <optimized out>
        rv = <optimized out>
        host = {len = 140014466007440, data = 0x442d07 <ngx_http_create_request+448> "H\211\203\360\003"}
        c = 0x7f57a8828190
        r = 0x17b4fd0
#17 0x000000000044567a in ngx_http_wait_request_handler (rev=0x17d0260) at src/http/ngx_http_request.c:487
        size = 1024
        n = <optimized out>
        b = 0x17b4a80
        c = 0x7f57a8828190
        hc = <optimized out>
        cscf = <optimized out>
#18 0x0000000000432e3b in ngx_epoll_process_events (cycle=<optimized out>, timer=<optimized out>, flags=<optimized out>) at src/event/modules/ngx_epoll_module.c:683
        events = 1
        revents = 1
        instance = <optimized out>
        i = 0
        level = <optimized out>
        err = <optimized out>
        rev = <optimized out>
        wev = <optimized out>
        queue = <optimized out>
        c = 0x7f57a8828190
#19 0x000000000042ba60 in ngx_process_events_and_timers (cycle=cycle@entry=0x17aa270) at src/event/ngx_event.c:249
        flags = 1
        timer = 60000
        delta = 1382376560191
#20 0x0000000000431836 in ngx_worker_process_cycle (cycle=0x17aa270, data=<optimized out>) at src/os/unix/ngx_process_cycle.c:813
        worker = <optimized out>
        i = <optimized out>
        c = <optimized out>
#21 0x00000000004301c6 in ngx_spawn_process (cycle=cycle@entry=0x17aa270, proc=proc@entry=0x43176a <ngx_worker_process_cycle>, data=data@entry=0x0, 
    name=name@entry=0x4c41fb "worker process", respawn=respawn@entry=-3) at src/os/unix/ngx_process.c:198
        on = 1
        pid = 0
        s = 0
#22 0x000000000043198f in ngx_start_worker_processes (cycle=cycle@entry=0x17aa270, n=1, type=type@entry=-3) at src/os/unix/ngx_process_cycle.c:364
        i = 0
        ch = {command = 1, pid = 0, slot = 0, fd = 0}
#23 0x0000000000431fed in ngx_master_process_cycle (cycle=cycle@entry=0x17aa270) at src/os/unix/ngx_process_cycle.c:136
        title = 0x17cdadc "master process /usr/local/openresty/nginx/sbin/nginx -p /home/cc/test/ -c nginx.conf.debug"
        p = <optimized out>
        size = <optimized out>
        i = <optimized out>
        n = <optimized out>
        sigio = <optimized out>
        set = {__val = {0 <repeats 16 times>}}
        itv = {it_interval = {tv_sec = 24959576, tv_usec = 0}, it_value = {tv_sec = 0, tv_usec = 0}}
        live = <optimized out>
        delay = <optimized out>
        ls = <optimized out>
        ccf = 0x17ab218
#24 0x000000000041720a in main (argc=<optimized out>, argv=<optimized out>) at src/core/nginx.c:412
        i = <optimized out>
        log = 0x705ea0 <ngx_log>
        cycle = 0x17aa270
        init_cycle = {conf_ctx = 0x0, pool = 0x17a95b0, log = 0x705ea0 <ngx_log>, new_log = {log_level = 0, file = 0x0, connection = 0, handler = 0x0, data = 0x0, action = 0x0}, 
          files = 0x0, free_connections = 0x0, free_connection_n = 0, reusable_connections_queue = {prev = 0x0, next = 0x0}, listening = {elts = 0x0, nelts = 0, size = 0, nalloc = 0, 
            pool = 0x0}, paths = {elts = 0x0, nelts = 0, size = 0, nalloc = 0, pool = 0x0}, open_files = {last = 0x0, part = {elts = 0x0, nelts = 0, next = 0x0}, size = 0, nalloc = 0, 
            pool = 0x0}, shared_memory = {last = 0x0, part = {elts = 0x0, nelts = 0, next = 0x0}, size = 0, nalloc = 0, pool = 0x0}, connection_n = 0, files_n = 0, connections = 0x0, 
          read_events = 0x0, write_events = 0x0, old_cycle = 0x0, conf_file = {len = 30, data = 0x17a9600 "\002"}, conf_param = {len = 0, data = 0x0}, conf_prefix = {len = 14, 
            data = 0x17a9600 "\002"}, prefix = {len = 14, data = 0x7ffffb8718ac ""}, lock_file = {len = 0, data = 0x0}, hostname = {len = 0, data = 0x0}}
        ccf = <optimized out>
(gdb)