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错误日志中 出现这个  是什么原因导致的呢
出现后 网站就容易出现无法访问的情况

2018/03/23 19:22:37 [crit] 8027#0: ngx_slab_alloc() failed: no memory in sdauth zone "sdauth_cookie_list"
2018/03/23 19:22:37 [alert] 17415#0: worker process 8027 exited on signal 11
2018/03/23 19:22:37 [alert] 17415#0: shared memory zone "sdauth_cookie_list" was locked by 8027
2018/03/23 19:22:37 [crit] 8029#0: ngx_slab_alloc() failed: no memory in sdauth zone "sdauth_cookie_list"
2018/03/23 19:22:37 [alert] 17415#0: worker process 8029 exited on signal 11
2018/03/23 19:22:37 [alert] 17415#0: shared memory zone "sdauth_cookie_list" was locked by 8029
2018/03/23 19:22:37 [crit] 8047#0: ngx_slab_alloc() failed: no memory in sdauth zone "sdauth_cookie_list"
2018/03/23 19:22:37 [alert] 17415#0: worker process 8047 exited on signal 11
2018/03/23 19:22:37 [alert] 17415#0: shared memory zone "sdauth_cookie_list" was locked by 8047
2018/03/23 19:22:37 [crit] 8048#0: ngx_slab_alloc() failed: no memory in sdauth zone "sdauth_cookie_list"
2018/03/23 19:22:37 [alert] 17415#0: worker process 8048 exited on signal 11