ngx.log导致崩溃

home_king · 2016-08-29T16:00:56+00:00

我测试了下lua-nginx-module 和 OpenSSL 1.1.0 不兼容因为 OpenSSL 1.1.0 修改&#x4E8...

ngx.log导致崩溃

home_king

最近在利用balancer_by_lua写一些动态upstream的逻辑，我发现调用ngx.log会使得程序崩溃。

这是用gdb显示的堆栈：

Program received signal SIGABRT, Aborted.

0x00007ffff63d7035 in raise () from /lib/x86_64-linux-gnu/libc.so.6

(gdb) bt

#0 0x00007ffff63d7035 in raise () from /lib/x86_64-linux-gnu/libc.so.6

#1 0x00007ffff63da79b in abort () from /lib/x86_64-linux-gnu/libc.so.6

#2 0x00007ffff63cfe1e in ?? () from /lib/x86_64-linux-gnu/libc.so.6

#3 0x00007ffff63cfec2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#4 0x00007ffff74fb2ea in debug_framepc (nextframe=<optimized out>, fn=<optimized out>, L=<optimized out>) at lj_debug.c:103

#5 debug_framepc (L=<optimized out>, fn=<optimized out>, nextframe=<optimized out>) at lj_debug.c:53

#6 0x00007ffff74fb7a9 in debug_frameline (L=<optimized out>, fn=0x40057718, nextframe=<optimized out>) at lj_debug.c:133

#7 0x00007ffff74fc36a in lj_debug_getinfo (L=0x40000378, what=0x58ce9d "l", ar=0x7fffffffd680, ext=0) at lj_debug.c:469

#8 0x00000000005003b8 in log_wrapper (log=0x7ffff7f0a740, ident=0x58ce94 "[lua] ", level=4, L=0x40000378) at ../ngx_lua-0.10.5/src/ngx_http_lua_log.c:110

#9 0x00000000005002a0 in ngx_http_lua_ngx_log (L=0x40000378) at ../ngx_lua-0.10.5/src/ngx_http_lua_log.c:58

这是为什么呢？好像就是log_wrapper里面这一句出问题：

lua_getinfo(L, "Snl", &ar);

home_king

找到原因了，我在balancer_by_lua里头写了

return fn()

似乎不应该用tail call，否则会有问题

在 2016年8月29日星期一 UTC+8下午4:00:56，Jinhua Luo写道：

最近在利用balancer_by_lua写一些动态upstream的逻辑，我发现调用ngx.log会使得程序崩溃。
这是用gdb显示的堆栈：

Program received signal SIGABRT, Aborted.
0x00007ffff63d7035 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff63d7035 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff63da79b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff63cfe1e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007ffff63cfec2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007ffff74fb2ea in debug_framepc (nextframe=<optimized out>, fn=<optimized out>, L=<optimized out>) at lj_debug.c:103
#5 debug_framepc (L=<optimized out>, fn=<optimized out>, nextframe=<optimized out>) at lj_debug.c:53
#6 0x00007ffff74fb7a9 in debug_frameline (L=<optimized out>, fn=0x40057718, nextframe=<optimized out>) at lj_debug.c:133
#7 0x00007ffff74fc36a in lj_debug_getinfo (L=0x40000378, what=0x58ce9d "l", ar=0x7fffffffd680, ext=0) at lj_debug.c:469
#8 0x00000000005003b8 in log_wrapper (log=0x7ffff7f0a740, ident=0x58ce94 "[lua] ", level=4, L=0x40000378) at ../ngx_lua-0.10.5/src/ngx_http_lua_log.c:110
#9 0x00000000005002a0 in ngx_http_lua_ngx_log (L=0x40000378) at ../ngx_lua-0.10.5/src/ngx_http_lua_log.c:58

这是为什么呢？好像就是log_wrapper里面这一句出问题：
lua_getinfo(L, "Snl", &ar);

agentzh

Hello!

2016-08-29 1:59 GMT-07:00 Jinhua Luo:
> 找到原因了，我在balancer_by_lua里头写了
> return fn()
> 似乎不应该用tail call，否则会有问题
>

你能提供一个最小化的可以复现问题的完整例子吗？多谢！

Regards,
-agentzh