id summary reporter owner description type status priority milestone component version resolution keywords cc uname nginx_version 1554 http2 client abort when upstream cause segment fault crasyangel.lhy@… "client canceled stream while reading response header from upstream log: ""2018/05/13 23:11:07 [info] 124561#0: *198618980 client canceled stream 13 while reading response header from upstream"" then execute: ev = fc->read; ev->handler(ev); ev->handler would be ngx_http_v2_close_stream_handler, then ngx_http_free_request request still used in ngx_http_upstream_handler, because upstream did not close when close stream segment fault stacktrace: (gdb) bt Python Exception No module named gdb.frames: #0 ngx_http_upstream_handler (ev=0x7f5e16447c60) at src/http/ngx_http_upstream.c:1261 #1 0x000000000047bb16 in ngx_event_expire_timers () at src/event/ngx_event_timer.c:96 #2 0x000000000047b5af in ngx_process_events_and_timers (cycle=cycle@entry=0x1320bf0) at src/event/ngx_event.c:263 #3 0x00000000004834dc in ngx_worker_process_cycle (cycle=0x1320bf0, data=) at src/os/unix/ngx_process_cycle.c:749 #4 0x0000000000481ba2 in ngx_spawn_process (cycle=cycle@entry=0x1320bf0, proc=proc@entry=0x483449 , data=data@entry=0x4, name=name@entry=0x76c9d6 ""worker process"", respawn=respawn@entry=-3) at src/os/unix/ngx_process.c:198 #5 0x000000000048278e in ngx_start_worker_processes (cycle=cycle@entry=0x1320bf0, n=6, type=type@entry=-3) at src/os/unix/ngx_process_cycle.c:358 #6 0x0000000000483e45 in ngx_master_process_cycle (cycle=cycle@entry=0x1320bf0) at src/os/unix/ngx_process_cycle.c:130 #7 0x000000000045bd6e in main (argc=, argv=) at src/core/nginx.c:382" defect closed critical nginx-core 1.12.x worksforme 2.6.32_1-16-0-0 "built by gcc 4.8.3 (GCC) built with OpenSSL 1.0.2h 3 May 2016 TLS SNI support enabled configure arguments: --with-debug --with-ipv6 --with-http_v2_module"