diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/vcl/vcl_locked.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/src/vcl/vcl_locked.c b/src/vcl/vcl_locked.c index 6c606f6b0db..44b7cedc9af 100644 --- a/src/vcl/vcl_locked.c +++ b/src/vcl/vcl_locked.c @@ -42,6 +42,8 @@ typedef struct vls_worker_ vcl_locked_session_t *vls_pool; uword *session_handle_to_vlsh_table; u32 wrk_index; + /** Vector of child wrk to cleanup */ + u32 *pending_wrk_cleanup; } vls_worker_t; typedef struct vls_local_ @@ -110,6 +112,9 @@ void vls_send_clone_and_share_rpc (vcl_worker_t *wrk, u32 origin_vls_index, u32 session_index, u32 vls_wrk_index, u32 dst_wrk_index, u32 dst_vls_index, u32 dst_session_index); +static void vls_cleanup_forked_child (vcl_worker_t *wrk, + vcl_worker_t *child_wrk); +static void vls_handle_pending_wrk_cleanup (void); static inline u32 vls_get_worker_index (void) @@ -315,6 +320,8 @@ vls_worker_alloc (void) if (vls_mt_wrk_supported ()) clib_rwlock_init (&wrk->sh_to_vlsh_table_lock); wrk->wrk_index = vcl_get_worker_index (); + vec_validate (wrk->pending_wrk_cleanup, 16); + vec_reset_length (wrk->pending_wrk_cleanup); } static void @@ -1409,6 +1416,7 @@ vls_epoll_wait (vls_handle_t ep_vlsh, struct epoll_event *events, wait_for_time); vls_mt_unguard (); vls_get_and_unlock (ep_vlsh); + vls_handle_pending_wrk_cleanup (); return rv; } @@ -1457,6 +1465,7 @@ vls_select (int n_bits, vcl_si_set * read_map, vcl_si_set * write_map, vls_select_mp_checks (read_map); rv = vppcom_select (n_bits, read_map, write_map, except_map, wait_for_time); vls_mt_unguard (); + vls_handle_pending_wrk_cleanup (); return rv; } @@ -1518,12 +1527,34 @@ vls_cleanup_forked_child (vcl_worker_t * wrk, vcl_worker_t * child_wrk) wrk->forked_child = ~0; } +static void +vls_handle_pending_wrk_cleanup (void) +{ + u32 *wip; + vcl_worker_t *child_wrk, *wrk; + vls_worker_t *vls_wrk = vls_worker_get_current (); + + if (PREDICT_TRUE (vec_len (vls_wrk->pending_wrk_cleanup) == 0)) + return; + + wrk = vcl_worker_get_current (); + vec_foreach (wip, vls_wrk->pending_wrk_cleanup) + { + child_wrk = vcl_worker_get_if_valid (*wip); + if (!child_wrk) + continue; + vls_cleanup_forked_child (wrk, child_wrk); + } + vec_reset_length (vls_wrk->pending_wrk_cleanup); +} + static struct sigaction old_sa; static void vls_intercept_sigchld_handler (int signum, siginfo_t * si, void *uc) { vcl_worker_t *wrk, *child_wrk; + vls_worker_t *vls_wrk; if (vcl_get_worker_index () == ~0) return; @@ -1547,7 +1578,14 @@ vls_intercept_sigchld_handler (int signum, siginfo_t * si, void *uc) VDBG (0, "unexpected child pid %u", si->si_pid); goto done; } - vls_cleanup_forked_child (wrk, child_wrk); + + /* Parent process may enter sighandler with a lock, such as lock in localtime + * or in mspace_free, and child wrk cleanup may try to get such locks and + * cause deadlock. + * So move child wrk cleanup from sighandler to vls_epoll_wait/vls_select. + */ + vls_wrk = vls_worker_get_current (); + vec_add1 (vls_wrk->pending_wrk_cleanup, child_wrk->wrk_index); done: if (old_sa.sa_flags & SA_SIGINFO) @@ -1644,6 +1682,9 @@ vls_app_exit (void) { vls_worker_t *wrk = vls_worker_get_current (); + /* Handle pending wrk cleanup */ + vls_handle_pending_wrk_cleanup (); + /* Unshare the sessions. VCL will clean up the worker */ vls_unshare_vcl_worker_sessions (vcl_worker_get_current ()); vls_worker_free (wrk); |