Update ngx_http_upsync_module.c

[kuaikuai]

通过队列指针获取原始数据结构，ngx_queue_data参数错误。

[datastream]

I think this segfault is related to this patch.
#0 0x0000558bb35f9c32 in ngx_write_fd (n=77, buf=0x7ffffe2a7560, fd=<error reading variable: Cannot access memory at address 0x10>)
at src/os/unix/ngx_files.h:147
147 src/os/unix/ngx_files.h: No such file or directory.
(gdb) bt
#0 0x0000558bb35f9c32 in ngx_write_fd (n=77, buf=0x7ffffe2a7560, fd=<error reading variable: Cannot access memory at address 0x10>)
at src/os/unix/ngx_files.h:147
#1 ngx_log_error_core (level=level@entry=8, log=0x558bb4cec3d0, err=err@entry=0, fmt=fmt@entry=0x558bb3704e9d "event timer del: %d: %M")
at src/core/ngx_log.c:183
#2 0x0000558bb36b1acc in ngx_event_del_timer (ev=0x558bb4ad5280) at src/event/ngx_event_timer.h:34
#3 ngx_http_upsync_clear_all_events (cycle=) at ./debian/modules/nginx-upsync-module/src/ngx_http_upsync_module.c:3617
#4 0x0000558bb36b1c4d in ngx_http_upsync_need_exit () at ./debian/modules/nginx-upsync-module/src/ngx_http_upsync_module.c:3562
#5 0x0000558bb36b3fa8 in ngx_http_upsync_recv_handler (event=0x7f21f5886610) at ./debian/modules/nginx-upsync-module/src/ngx_http_upsync_module.c:2777
#6 0x0000558bb360a505 in ngx_close_idle_connections (cycle=cycle@entry=0x558bb4cda790) at src/core/ngx_connection.c:1274
#7 0x0000558bb3623200 in ngx_worker_process_cycle (cycle=cycle@entry=0x558bb4cda790, data=data@entry=0x0) at src/os/unix/ngx_process_cycle.c:767
#8 0x0000558bb362154f in ngx_spawn_process (cycle=cycle@entry=0x558bb4cda790, proc=proc@entry=0x558bb36230e0 <ngx_worker_process_cycle>,
data=data@entry=0x0, name=name@entry=0x558bb3707903 "worker process", respawn=respawn@entry=-4) at src/os/unix/ngx_process.c:199
#9 0x0000558bb36227e0 in ngx_start_worker_processes (cycle=cycle@entry=0x558bb4cda790, n=4, type=type@entry=-4) at src/os/unix/ngx_process_cycle.c:359
#10 0x0000558bb3624132 in ngx_master_process_cycle (cycle=0x558bb4cda790) at src/os/unix/ngx_process_cycle.c:244
#11 0x0000558bb35f8148 in main (argc=, argv=) at src/core/nginx.c:382

[xiaokai-wang]

Thanks @kuaikuai .