Half-opens are only allocated from main with worker barrier but can be
cleaned up, i.e., session_half_open_free, from main without a barrier.
In debug images, the free_bitmap can grow while workers peek the
sessions pool, e.g., session_half_open_migrate_notify, and as a result
crash while validating the session. To avoid, proactively grow bitmap in
debug images.
Type: fix
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I2410793f933fb638651fe8dc08ba78e9bee0bd77
s = session_alloc (0);
s->session_state = SESSION_STATE_CONNECTING;
s->flags |= SESSION_F_HALF_OPEN;
+ /* Not ideal. Half-opens are only allocated from main with worker barrier
+ * but can be cleaned up, i.e., session_half_open_free, from main without
+ * a barrier. In debug images, the free_bitmap can grow while workers peek
+ * the sessions pool, e.g., session_half_open_migrate_notify, and as a
+ * result crash while validating the session. To avoid this, grow the bitmap
+ * now. */
+ if (CLIB_DEBUG)
+ {
+ session_t *sp = session_main.wrk[0].sessions;
+ clib_bitmap_validate (pool_header (sp)->free_bitmap, s->session_index);
+ }
return s;
}