bb30b22419
A deadlock can happen between a thread unloading or reloading the cel_pgsql
module and the core_event_dispatcher taskprocessor thread. Description of
what is happening:
Thread 1 (for example, a netconsole thread):
a "module reload cel_pgsql" is launched
the thread enter the "my_unload_module" function (cel_pgsql.c)
the thread acquire the write lock on psql_columns
the thread enter the "ast_event_unsubscribe" function (event.c)
the thread try to acquire the write lock on ast_event_subs[sub->type]
Thread 2 (core_event_dispatcher taskprocessor thread):
the taskprocessor pop a CEL event
the thread enter the "handle_event" function (event.c)
the thread acquire the read lock on ast_event_subs[sub->type]
the thread callback the "pgsql_log" function (cel_pgsql.c), since it's a subscriber of CEL events
the thread try to acquire a read lock on psql_columns
(closes issue ASTERISK-22854)
Reported by: Etienne Lessard
Patches:
cel_pgsql_fix_deadlock_event.patch uploaded by hexanol (license 6394)
........
Merged revisions 404603 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........
Merged revisions 404604 from http://svn.asterisk.org/svn/asterisk/branches/11
........
Merged revisions 404605 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404606 65c4cc65-6c06-0410-ace0-fbb531ad65f3
|
||
|---|---|---|
| .. | ||
| Makefile | ||
| cel_custom.c | ||
| cel_manager.c | ||
| cel_odbc.c | ||
| cel_pgsql.c | ||
| cel_radius.c | ||
| cel_sqlite3_custom.c | ||
| cel_tds.c | ||