GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /usr/local/nginx-qat/sbin/nginx...done.
[New LWP 15981]
[New LWP 16000]
[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 SIGSEGV, Segmentation fault.
#0  0x0000000000000000 in ?? ()
[Current thread is 1 (Thread 0x7f0b18f1ab40 (LWP 15981))]
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00005585c657e441 in ngx_http_request_handler (ev=0x7f0b0e9fe968) at src/http/ngx_http_request.c:2216
#2  0x00005585c6568bcb in ngx_epoll_process_events (cycle=<optimized out>, timer=<optimized out>, flags=<optimized out>) at src/event/modules/ngx_epoll_module.c:889
#3  0x00005585c655e3ca in ngx_process_events_and_timers (cycle=cycle@entry=0x5585c7b00ec0) at src/event/ngx_event.c:247
#4  0x00005585c65661d5 in ngx_worker_process_cycle (cycle=cycle@entry=0x5585c7b00ec0, data=data@entry=0x9) at src/os/unix/ngx_process_cycle.c:769
#5  0x00005585c6564b8c in ngx_spawn_process (cycle=cycle@entry=0x5585c7b00ec0, proc=proc@entry=0x5585c6566160 <ngx_worker_process_cycle>, data=data@entry=0x9, 
    name=name@entry=0x5585c65d84f7 "worker process", respawn=respawn@entry=-3) at src/os/unix/ngx_process.c:198
#6  0x00005585c6566490 in ngx_start_worker_processes (cycle=cycle@entry=0x5585c7b00ec0, n=20, type=type@entry=-3) at src/os/unix/ngx_process_cycle.c:360
#7  0x00005585c65672ea in ngx_master_process_cycle (cycle=0x5585c7b00ec0) at src/os/unix/ngx_process_cycle.c:132
#8  0x00005585c6540e74 in main (argc=3, argv=<optimized out>) at src/core/nginx.c:374
(gdb) show locals
Undefined show command: "locals".  Try "help show".
(gdb) info locals
No symbol table info available.
(gdb) i r
rax            0x5585c7c8abb8 94033070828472
rbx            0x5585c7c8ab70 94033070828400
rcx            0x33 51
rdx            0x5585c7b19880 94033069316224
rsi            0x5585c7c8ab10 94033070828304
rdi            0x5585c7c8ab70 94033070828400
rbp            0x7f0b0f080658 0x7f0b0f080658
rsp            0x7fff89280d78 0x7fff89280d78
r8             0x53 83
r9             0x1  1
r10            0x5585c7b00ec0 94033069215424
r11            0x1  1
r12            0x7f0b0e9fe968 139685466728808
r13            0x1  1
r14            0x7f0b0e9fe968 139685466728808
r15            0x5  5
rip            0x0  0x0
eflags         0x10246  [ PF ZF IF RF ]
cs             0x33 51
ss             0x2b 43
ds             0x0  0
es             0x0  0
fs             0x0  0
gs             0x0  0
(gdb) x/30i $rip
=> 0x0: Cannot access memory at address 0x0
(gdb) select 1
(gdb) print *ev
$1 = {data = 0x7f0b0f080658, write = 0, async = 0, accept = 0, instance = 1, active = 1, disabled = 0, ready = 1, oneshot = 0, complete = 0, eof = 0, error = 0, timedout = 0, 
  timer_set = 1, delayed = 0, deferred_accept = 0, pending_eof = 0, posted = 0, closed = 0, channel = 0, resolver = 0, cancelable = 0, available = 0, 
  handler = 0x5585c657e410 <ngx_http_request_handler>, saved_handler = 0x5585c656a440 <ngx_ssl_empty_handler>, index = 3503345872, log = 0x5585c7c8ab10, timer = {
    key = 1540552888826, left = 0x7f0b0e9fe380, right = 0x7f0b0e9fe930, parent = 0x7f0b0e9feb38, color = 0 '\000', data = 0 '\000'}, queue = {prev = 0x0, next = 0x0}}
(gdb) print *r
$2 = {signature = 3350589192, connection = 0x5585c7b3ed40, ctx = 0x5585c7c8ac30, main_conf = 0x0, srv_conf = 0x0, loc_conf = 0x0, read_event_handler = 0x0, 
  write_event_handler = 0x0, cache = 0x1, upstream = 0x7f0b0f080658, upstream_states = 0x0, pool = 0x5585c7c8ab70, header_in = 0x5585c7b76960, headers_in = {headers = {
      last = 0x5585c7b4baf0, part = {elts = 0xfffffffffffffffe, nelts = 94033069734016, next = 0x4000}, size = 94033046674608, nalloc = 0, pool = 0x0}, host = 0xd, 
    connection = 0x69702d37376e6463, if_modified_since = 0x632d78786e782e63, if_unmodified_since = 0x6d6f632e6e64, if_match = 0x16, if_none_match = 0x5585c7c8ac18, 
    user_agent = 0x0, referer = 0x5585c7d1cfb3, content_length = 0x0, content_type = 0x0, range = 0x5585c7d1cd30, if_range = 0x5585c7d1dd30, transfer_encoding = 0x0, 
    expect = 0x0, upgrade = 0x0, accept_encoding = 0x1, via = 0x0, authorization = 0x0, keep_alive = 0x5585c7c8ac90, x_forwarded_for = {elts = 0x0, nelts = 528, size = 131201, 
      nalloc = 139685618909944, pool = 0x7f0b17b202f8 <main_arena+2040>}, user = {len = 94033070828720, data = 0x5585c7c8acb0 "\020\002"}, passwd = {len = 11120845382135968070, 
      data = 0x251c8947182fbf5d <error: Cannot access memory at address 0x251c8947182fbf5d>}, cookies = {elts = 0xb7a485da02f3d993, nelts = 901183282513868974, 
      size = 14661983407599690245, nalloc = 15659385526669271463, pool = 0x53250eb7dee5e5cf}, server = {len = 17334918956194213440, 
      data = 0x980579a95bdce35c <error: Cannot access memory at address 0x980579a95bdce35c>}, content_length_n = -6522007941220118845, keep_alive_n = -4594549527564757521, 
    connection_type = 3, chunked = 1, msie = 0, msie6 = 1, opera = 0, gecko = 0, chrome = 0, safari = 0, konqueror = 1}, headers_out = {headers = {last = 0x8d53556b419254ce, 
      part = {elts = 0x163bf53640f1df47, nelts = 199731807178760235, next = 0x424b322ba6385d69}, size = 10287006653680141124, nalloc = 1201212185290263492, 
      pool = 0xde294b314744fa32}, status = 16157060372513669347, status_line = {len = 10045584839303098397, 
      data = 0xddec77e96a67eb99 <error: Cannot access memory at address 0xddec77e96a67eb99>}, server = 0xf7e3cc9d7e75f91a, date = 0xbfde92e5a12df2d4, 
    content_length = 0x5e391a261a4cd832, content_encoding = 0x97c54191969a984d, location = 0x6bcc711f1c4efd06, refresh = 0x286654a0eb1080e8, last_modified = 0x895248ff57986906, 
    content_range = 0xe69fdf6ee67d8262, accept_ranges = 0x4bf4ba659de086f1, www_authenticate = 0x78e67bcf410ed241, expires = 0x3b0736db498a4067, etag = 0x8444b7a5c8142ad8, 
    override_charset = 0x39b3e7cb99866a4a, content_type_len = 2280075612641108704, content_type = {len = 5580860325431241409, 
      data = 0x38b98d8bac08a590 <error: Cannot access memory at address 0x38b98d8bac08a590>}, charset = {len = 17223192131476325900, 
      data = 0xbca8558c609a7871 <error: Cannot access memory at address 0xbca8558c609a7871>}, 
    content_type_lowcase = 0x2c114407349048d0 <error: Cannot access memory at address 0x2c114407349048d0>, content_type_hash = 18174368546824094033, cache_control = {
      elts = 0x1830a629dbe7554a, nelts = 5510728804419482053, size = 17681678864941829811, nalloc = 367162257924403361, pool = 0x41c34c586d71cebc}, 
    content_length_n = -4016261039545434390, content_offset = -1046623493439093923, date_time = -2054489491924542784, last_modified_time = -806369667749361640}, 
  request_body = 0xa73e6dd3e5154195, lingering_time = -1331802250812231479, start_sec = 3243267124691148723, start_msec = 17848401994670752634, method = 17571521435466645138, 
  http_version = 5693532815950218063, request_line = {len = 5518126113930295018, data = 0x90cb778d2ddf63a7 <error: Cannot access memory at address 0x90cb778d2ddf63a7>}, uri = {
    len = 3682249112024658260, data = 0x5d702ba8e7275e4 <error: Cannot access memory at address 0x5d702ba8e7275e4>}, args = {len = 12454182252344841768, 
    data = 0x699872e9fa046956 <error: Cannot access memory at address 0x699872e9fa046956>}, exten = {len = 13574302284795198445, 
    data = 0x3abf9f9a90f6f773 <error: Cannot access memory at address 0x3abf9f9a90f6f773>}, unparsed_uri = {len = 3463348116500593186, 
    data = 0xfff0a540f94b36ca <error: Cannot access memory at address 0xfff0a540f94b36ca>}, method_name = {len = 9788744558611103985, 
    data = 0xe8bf27cf1218eb13 <error: Cannot access memory at address 0xe8bf27cf1218eb13>}, http_protocol = {len = 17761136314344185511, 
    data = 0x4dc5f9bf307a2e6a <error: Cannot access memory at address 0x4dc5f9bf307a2e6a>}, out = 0x65acbf7b79472216, main = 0xf657d6d07fde29b0, parent = 0x13f885b28a401517, 
  postponed = 0x6a54b8c822c94f3a, post_subrequest = 0x18e23c308278c4d7, posted_requests = 0xaca68ffb4fba535, phase_handler = -3444386785190317668, 
  content_handler = 0x4f5aed7b8594c363, access_code = 3074068157070805336, variables = 0xc8b7d2ffaa1b18c6, ncaptures = 12335050605644481000, captures = 0xd6f781a1d8aa2a08, 
  captures_data = 0xe69de64eebdc5c9f <error: Cannot access memory at address 0xe69de64eebdc5c9f>, limit_rate = 11270650369229741840, limit_rate_after = 8029697670436415167, 
  header_size = 13246466388924035972, request_length = -2753111436193700035, err_status = 8415255895127854542, http_connection = 0xfd250cea32ba2f94, stream = 0x5b98e63d032d3713, 
  log_handler = 0x4326286d46371376, cleanup = 0xf1960ff0c5bddf0d, count = 24096, subrequests = 48, blocked = 18, aio = 1, http_state = 4, complex_uri = 0, quoted_uri = 1, 
  plus_in_uri = 1, space_in_uri = 0, invalid_header = 1, add_uri_to_alias = 1, valid_location = 0, valid_unparsed_uri = 1, uri_changed = 0, uri_changes = 12, 
  request_body_in_single_buf = 0, request_body_in_file_only = 0, request_body_in_persistent_file = 0, request_body_in_clean_file = 1, request_body_file_group_access = 1, 
  request_body_file_log_level = 0, request_body_no_buffering = 1, subrequest_in_memory = 0, waited = 0, cached = 1, gzip_tested = 0, gzip_ok = 1, gzip_vary = 0, proxy = 0, 
  bypass_cache = 1, no_cache = 1, limit_conn_set = 1, limit_req_set = 1, pipeline = 1, chunked = 1, header_only = 1, keepalive = 0, lingering_close = 1, discard_body = 1, 
  reading_body = 0, internal = 0, error_page = 0, filter_finalize = 0, post_action = 1, request_complete = 0, request_output = 0, header_sent = 0, expect_tested = 0, 
  root_tested = 1, done = 0, logged = 1, buffered = 6, main_filter_need_in_memory = 1, filter_need_in_memory = 1, filter_need_temporary = 1, allow_ranges = 0, 
  subrequest_ranges = 1, single_range = 0, disable_not_modified = 0, stat_reading = 1, stat_writing = 1, state = 15571879157743536836, header_hash = 10540199830626698698, 
  lowcase_index = 32099829830448381, lowcase_header = "t\277\023\372\065ܲ8V\361\360\235\377\006\364\367o\210\274\275\005?8\201\252,\340\357X\b", <incomplete sequence \344>, 
  header_name_start = 0x797874e0b13ad7c1 <error: Cannot access memory at address 0x797874e0b13ad7c1>, 
  header_name_end = 0x1b61df29ceca499c <error: Cannot access memory at address 0x1b61df29ceca499c>, 
  header_start = 0x7f3b3aa411cfeaf6 <error: Cannot access memory at address 0x7f3b3aa411cfeaf6>, 
  header_end = 0xc07075e7e5c47ee7 <error: Cannot access memory at address 0xc07075e7e5c47ee7>, 
  uri_start = 0xcd57440c9db7b633 <error: Cannot access memory at address 0xcd57440c9db7b633>, 
  uri_end = 0x5cf787f078aab04a <error: Cannot access memory at address 0x5cf787f078aab04a>, 
  uri_ext = 0x40c13323af2766bb <error: Cannot access memory at address 0x40c13323af2766bb>, 
  args_start = 0x96ca9521d6e6f54f <error: Cannot access memory at address 0x96ca9521d6e6f54f>, 
  request_start = 0xc4a66f13b94c3f6c <error: Cannot access memory at address 0xc4a66f13b94c3f6c>, 
  request_end = 0xc8172bb02795547c <error: Cannot access memory at address 0xc8172bb02795547c>, 
  method_end = 0x748fda132c9b6e3a <error: Cannot access memory at address 0x748fda132c9b6e3a>, 
  schema_start = 0xbf72d14408a81f23 <error: Cannot access memory at address 0xbf72d14408a81f23>, 
  schema_end = 0x92f3592499304ec0 <error: Cannot access memory at address 0x92f3592499304ec0>, 
  host_start = 0xb69a1cef45bcbf7 <error: Cannot access memory at address 0xb69a1cef45bcbf7>, 
  host_end = 0x6e05182e46dba5f2 <error: Cannot access memory at address 0x6e05182e46dba5f2>, 
  port_start = 0x5bb6c09634c95dcf <error: Cannot access memory at address 0x5bb6c09634c95dcf>, 
  port_end = 0xdec5ffd679938e84 <error: Cannot access memory at address 0xdec5ffd679938e84>, http_minor = 34827, http_major = 2652}
(gdb) print ev->data
$3 = (void *) 0x7f0b0f080658
(gdb) print (ngx_connection_t*) (ev->data)
$4 = (ngx_connection_t *) 0x7f0b0f080658
(gdb) print (ngx_connection_t*) *(ev->data)
Attempt to dereference a generic pointer.
(gdb) print *((ngx_connection_t*) (ev->data))
$5 = {data = 0x5585c7c8ab70, read = 0x7f0b0e9fe968, write = 0x7f0b0e37d968, async = 0x7f0b0dcfc968, fd = 83, async_fd = 89, recv = 0x5585c656dc20 <ngx_ssl_recv>, 
  send = 0x5585c656ca70 <ngx_ssl_write>, recv_chain = 0x5585c656e500 <ngx_ssl_recv_chain>, send_chain = 0x5585c656cf20 <ngx_ssl_send_chain>, listening = 0x5585c7b63760, 
  sent = 17564, log = 0x5585c7c8ab10, pool = 0x5585c7c8aab0, type = 1, sockaddr = 0x5585c7c8ab00, socklen = 16, addr_text = {len = 14, data = 0x5585c7c8ab60 "41.233.143.203"}, 
  proxy_protocol_addr = {len = 0, data = 0x0}, ssl = 0x5585c7c8abd0, asynch = 1, ssl_enabled = 1, local_sockaddr = 0x5585c7b5eed0, local_socklen = 16, buffer = 0x5585c7c8ac40, 
  queue = {prev = 0x7f0b0f080630, next = 0x7f0b0f07fd78}, number = 2529, requests = 7, buffered = 0, log_error = 2, unexpected_eof = 0, timedout = 0, error = 0, destroyed = 1, 
  idle = 1, reusable = 1, close = 0, shared = 0, sendfile = 1, sndlowat = 0, tcp_nodelay = 1, tcp_nopush = 0, need_last_buf = 0, num_async_fds = 1}
(gdb) info locals
c = 0x7f0b0f080658
r = 0x5585c7c8ab70
(gdb) q