nginx-0.8.53 segfault

Fri Jan 14 20:15:50 MSK 2011

Maxim, thanks for your help. I saved fresh core :) to anothe directory 
and ran gdb, output of the commands that you provided is:

(gdb) fr 0
#0  0x080aaca8 in ngx_http_file_cache_update (r=0x8200528, tf=0x8201570) 
at src/http/ngx_http_file_cache.c:790
790      if (c->updated) {
(gdb) p c
$1 = (ngx_http_cache_t *) 0x0
(gdb) p *r
$2 = {signature = 1347703880, connection = 0x8133e88, ctx = 0x82009d8, 
main_conf = 0x8100a0c, srv_conf = 0x8112e90, loc_conf = 0x8113e38,
  read_event_handler = 0x809ba57 
<ngx_http_upstream_rd_check_broken_connection>, write_event_handler = 
0x808ba03 <ngx_http_request_empty_handler>,
  cache = 0x0, upstream = 0x8200dc0, upstream_states = 0x8201378, pool = 
0x82007d0, header_in = 0x81fbf1c, headers_in = {headers = {last = 
0x8200560,
      part = {elts = 0x8200af4, nelts = 9, next = 0x0}, size = 24, 
nalloc = 20, pool = 0x82007d0}, host = 0x8200af4, connection = 0x0,
    if_modified_since = 0x0, user_agent = 0x8200b0c, referer = 
0x8200bb4, content_length = 0x0, content_type = 0x0, range = 0x0, 
if_range = 0x0,
    transfer_encoding = 0x0, expect = 0x0, accept_encoding = 0x8200b54, 
via = 0x0, authorization = 0x0, keep_alive = 0x8200b84, x_forwarded_for 
= 0x0,
    x_real_ip = 0x0, depth = 0x0, destination = 0x0, overwrite = 0x0, 
date = 0x0, user = {len = 0, data = 0x0}, passwd = {len = 0, data = 
0x0}, cookies = {
      elts = 0x8200cd4, nelts = 0, size = 4, nalloc = 2, pool = 
0x82007d0}, server = {len = 13,
      data = 0x8200ce0 
"media.ifun.ruuser-agentacceptaccept-languageaccept-encodingaccept-charsetkeep-aliveconnectionreferer\034I\021\b"},
    content_length_n = -1, keep_alive_n = 115, connection_type = 2, msie 
= 0, msie4 = 0, msie6 = 0, opera = 0, gecko = 1, chrome = 0, safari = 0,
    konqueror = 0}, headers_out = {headers = {last = 0x820060c, part = 
{elts = 0x82007f8, nelts = 0, next = 0x0}, size = 24, nalloc = 20,
      pool = 0x82007d0}, status = 200, status_line = {len = 0, data = 
0x0}, server = 0x0, date = 0x0, content_length = 0x0, content_encoding = 
0x0,
    location = 0x0, refresh = 0x0, last_modified = 0x0, content_range = 
0x0, accept_ranges = 0x0, www_authenticate = 0x0, expires = 0x0, etag = 
0x0,
    override_charset = 0x0, content_type_len = 9, content_type = {len = 
9, data = 0x80d4ce9 "image/gif"}, charset = {len = 0, data = 0x0},
    content_type_lowcase = 0x0, content_type_hash = 0, cache_control = 
{elts = 0x0, nelts = 0, size = 0, nalloc = 0, pool = 0x0}, 
content_length_n = 43,
    date_time = 0, last_modified_time = 23349600}, request_body = 
0x820103c, lingering_time = 0, start_sec = 1295025115, start_msec = 407, 
method = 2,
  http_version = 1001, request_line = {len = 30, data = 0x81fbfa8 "GET 
/preview/x045.jpg HTTP/1.1\r\nHost"}, uri = {len = 6, data = 0x8113d6c 
"/empty"},
  args = {len = 0, data = 0x0}, exten = {len = 0, data = 0x0}, 
unparsed_uri = {len = 17, data = 0x81fbfac "/preview/x045.jpg 
HTTP/1.1\r\nHost"},
  method_name = {len = 3, data = 0x80cdf28 "GET "}, http_protocol = {len 
= 8, data = 0x81fbfbe "HTTP/1.1\r\nHost"}, out = 0x0, main = 0x8200528,
  parent = 0x0, postponed = 0x0, post_subrequest = 0x0, posted_requests 
= 0x0, virtual_names = 0x81336a4, phase_handler = 12,
  content_handler = 0x80c6618 <ngx_http_empty_gif_handler>, access_code 
= 0, variables = 0x8200a54, ncaptures = 0, captures = 0x0, captures_data 
= 0x0,
  limit_rate = 0, header_size = 217, request_length = 423, err_status = 
0, http_connection = 0x81fbefc,
  log_handler = 0x808c150 <ngx_http_log_error_handler>, cleanup = 
0x82013ac, subrequests = 51, count = 2, blocked = 0, aio = 0, http_state 
= 2,
---Type <return> to continue, or q <return> to quit---
  complex_uri = 0, quoted_uri = 0, plus_in_uri = 0, space_in_uri = 0, 
invalid_header = 0, add_uri_to_alias = 0, valid_location = 1,
  valid_unparsed_uri = 1, uri_changed = 0, uri_changes = 10, 
request_body_in_single_buf = 0, request_body_in_file_only = 0,
  request_body_in_persistent_file = 0, request_body_in_clean_file = 0, 
request_body_file_group_access = 0, request_body_file_log_level = 5,
  subrequest_in_memory = 0, waited = 0, cached = 0, gzip_tested = 0, 
gzip_ok = 0, gzip_vary = 0, proxy = 0, bypass_cache = 0, no_cache = 0,
  limit_zone_set = 0, limit_req_set = 0, pipeline = 0, plain_http = 0, 
chunked = 0, header_only = 0, keepalive = 1, lingering_close = 0, 
discard_body = 0,
  internal = 1, error_page = 1, ignore_content_encoding = 0, 
filter_finalize = 1, post_action = 0, request_complete = 0, 
request_output = 1,
  header_sent = 1, expect_tested = 0, root_tested = 0, done = 0, logged 
= 0, buffered = 0, main_filter_need_in_memory = 1, filter_need_in_memory 
= 0,
  filter_need_temporary = 0, allow_ranges = 0, stat_reading = 0, 
stat_writing = 1, state = 0, header_hash = 3519315678, lowcase_index = 
10,
  lowcase_header = "connectionngthg", '\000' <repeats 16 times>,
  header_name_start = 0x82018a9 "\r\n<html>\r\n<head><title>404 Not 
Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not 
Found</h1></center>\r\n<hr><center>nginx/0.8.53</center>\r\n</body>\r\n</html>\r\n\320\037 
\b\364\" \b",
  header_name_end = 0x82018a0 ": close\r\n\r\n<html>\r\n<head><title>404 
Not Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 
Not 
Found</h1></center>\r\n<hr><center>nginx/0.8.53</center>\r\n</body>\r\n</html>\r\n\320\037 
\b\364\" \b",
  header_start = 0x82018a2 "close\r\n\r\n<html>\r\n<head><title>404 Not 
Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not 
Found</h1></center>\r\n<hr><center>nginx/0.8.53</center>\r\n</body>\r\n</html>\r\n\320\037 
\b\364\" \b",
  header_end = 0x82018a9 "\r\n<html>\r\n<head><title>404 Not 
Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not 
Found</h1></center>\r\n<hr><center>nginx/0.8.53</center>\r\n</body>\r\n</html>\r\n\320\037 
\b\364\" \b", uri_start = 0x81fbfac "/preview/x045.jpg 
HTTP/1.1\r\nHost",
  uri_end = 0x81fbfbd " HTTP/1.1\r\nHost", uri_ext = 0x81fbfba "jpg 
HTTP/1.1\r\nHost", args_start = 0x0,
  request_start = 0x81fbfa8 "GET /preview/x045.jpg HTTP/1.1\r\nHost", 
request_end = 0x81fbfc6 "\r\nHost",
  method_end = 0x81fbfaa "T /preview/x045.jpg HTTP/1.1\r\nHost", 
schema_start = 0x0, schema_end = 0x0, host_start = 0x0, host_end = 0x0, 
port_start = 0x0,
  port_end = 0x0, http_minor = 1, http_major = 1}
(gdb) p *c
Cannot access memory at address 0x0

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