[syslog-ng] load failures in afsocket and afsql

[Matthew Hall]

OK. I still have no idea why spoof source libnet and sql libdbi fail to load.

But I did get a good idea why the init still fails with the cryptic 
pipeline message with those disabled.

#0  log_db_parser_init (s=0x3dcb270, cfg=0x3d9d860) at dbparser.c:147
#1  0x00002abeea802f79 in log_parser_init (s=0x3dcb270, cfg=0x3d9d860) at logparser.h:56
#2  0x00002abeea802f27 in log_parser_rule_init (s=0x3dcb360, cfg=0x3d9d860) at logparser.c:105
#3  0x00002abeea803269 in log_process_rule_init (s=0x3dcb360, cfg=0x3d9d860) at logprocess.h:62
#4  0x00002abeea803238 in log_process_pipe_init (s=0x3dccdd0) at logprocess.c:60
#5  0x00002abeea7f0036 in log_pipe_init (s=0x3dccdd0, cfg=0x3d9d860) at logpipe.h:91
#6  0x00002abeea7eff34 in log_center_init (self=0x3da96f0, cfg=0x3d9d860) at center.c:508
#7  0x00002abeea7e6caf in cfg_init (cfg=0x3d9d860) at cfg.c:245
#8  0x00002abeea7e7846 in cfg_initial_init (cfg=0x3d9d860, persist_filename=0x402d10 "/home/y/var/run/syslog-ng/syslog-ng.persist") at cfg.c:510
#9  0x00000000004027f6 in initial_init (cfg=0x7fff1e086978) at main.c:287
#10 0x0000000000402b4c in main (argc=1, argv=0x7fff1e086a78) at main.c:426

log_db_parser_init can fail an init without logging an error and pass it 
all the way back up to log_center_init without explaining what failed, 
why it failed, or how it failed, in some cases. log_center_init is so 
far up it doesn't know how to log a useful message about what really 
happened.

Apparently, in log_db_parser_reload_database from dbparser.c you can get 
a case where:

if ((self->db_file_inode == st.st_ino && self->db_file_mtime == st.st_mtime))

forces an early return despite the fact that self->db is still NULL.

I think this can happen when cfg_persist_config_fetch is supposed to 
have the DB stored already but it unexpectedly does not.

I will have to investigate what's gone wrong with the persistent storage 
on my system. Probably a missing directory cause a file write failure, 
etc.

Breakpoint 46, log_db_parser_init (s=0x1009d270, cfg=0x1006f860) at dbparser.c:121
121	  LogDBParser *self = (LogDBParser *) s;
123	  self->db = cfg_persist_config_fetch(cfg, log_db_parser_format_persist_name(self));
124	  if (self->db)
(gdb) print self->db

*** self->db fails to initialize via cfg_persist_config_fetch ***

$32 = (PatternDB *) 0x0
142	      log_db_parser_reload_database(self);

Breakpoint 49, log_db_parser_reload_database (self=0x1009d270) at dbparser.c:61
61	  if (stat(self->db_file, &st) < 0)
68	  if ((self->db_file_inode == st.st_ino && self->db_file_mtime == st.st_mtime))

*** early return happens here without checking if self->db == NULL ***

98	}

...

Breakpoint 47, log_db_parser_init (s=0x1009d270, cfg=0x1006f860) at dbparser.c:146
146	  return self->db != NULL;
(gdb) print self->db
$33 = (PatternDB *) 0x0
(gdb) n

...

log_parser_rule_init (s=0x1009d360, cfg=0x1006f860) at logparser.c:106
106	        success = FALSE;

...

log_pipe_init (s=0x1009edd0, cfg=0x1006f860) at logpipe.h:96
96	      return FALSE;

...

log_center_init (self=0x1007b6f0, cfg=0x1006f860) at center.c:510
510	          msg_error("Error initializing message pipeline",

Matthew.