还是endless loop 的问题，附gdb attach到skynet进程的相关信息 #1754

ericzhanchina · 2023-05-24T09:25:59Z

ericzhanchina
May 24, 2023

服务器不定期就会出现endless loop的问题，无法响应任何请求，10分钟左右就会恢复正常。这是之前的链接#1742

云风指点我，让出现问题的时候用gdb attach到进程，看看里面的堆栈信息，今天正好发生无法登录的时候，我正在服务器上，所以就操作了一下，获得了一点信息，本人才疏学浅，对GDB不熟悉，还请云风大佬和各位懂行的大佬给分析一下，是哪里出了问题。

是线程5在写日志的时候卡死了吗？

gdb -p 184326
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Attaching to process 184326
[New LWP 184333]
[New LWP 184334]
[New LWP 184335]
[New LWP 184336]

warning: Could not load shared library symbols for 9 libraries, e.g. ./skynet/cservice/logger.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
__futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:57
57	./nptl/futex-internal.c: No such file or directory.
(gdb) info sharedlibrary
From                To                  Syms Read   Shared Object Library
0x00007f32231ff040  0x00007f32231ff105  Yes         /lib/x86_64-linux-gnu/libpthread.so.0
0x00007f32231253a0  0x00007f32231a08e8  Yes         /lib/x86_64-linux-gnu/libm.so.6
0x00007f3223113040  0x00007f3223113105  Yes         /lib/x86_64-linux-gnu/libdl.so.2
0x00007f322310e080  0x00007f322310e275  Yes         /lib/x86_64-linux-gnu/librt.so.1
0x00007f32230f0660  0x00007f3223106be5  Yes (*)     /lib/x86_64-linux-gnu/libgcc_s.so.1
0x00007f3222eeb700  0x00007f322307dabd  Yes         /lib/x86_64-linux-gnu/libc.so.6
0x00007f322320f090  0x00007f3223238335  Yes         /lib64/ld-linux-x86-64.so.2
                                        No          ./skynet/cservice/logger.so
                                        No          ./skynet/cservice/snlua.so
                                        No          ./skynet/luaclib/skynet.so
                                        No          ./skynet/cservice/harbor.so
                                        No          ./libs/c/cjson.so
                                        No          ./libs/c/snowflake.so
                                        No          ./libs/c/usertime.so
                                        No          ./skynet/luaclib/lpeg.so
                                        No          ./skynet/luaclib/sproto.so
(*): Shared library is missing debugging information.
(gdb) info thread
  Id   Target Id                                   Frame 
* 1    Thread 0x7f3222ec1180 (LWP 184326) "skynet" __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:57
  2    Thread 0x7f32215ff640 (LWP 184333) "skynet" 0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f32215fe3b0, rem=rem@entry=0x7f32215fe3b0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
  3    Thread 0x7f3220dfe640 (LWP 184334) "skynet" 0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f3220dfd3b0, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
  4    Thread 0x7f32205fd640 (LWP 184335) "skynet" 0x00007f3222fe8fde in epoll_wait (epfd=3, events=events@entry=0x7f32205fc020, maxevents=maxevents@entry=64, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
  5    Thread 0x7f321fdfc640 (LWP 184336) "skynet" __GI___libc_write (nbytes=112, buf=0x7f321f17ec00, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26
(gdb) info threads
  Id   Target Id                                   Frame 
* 1    Thread 0x7f3222ec1180 (LWP 184326) "skynet" __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:57
  2    Thread 0x7f32215ff640 (LWP 184333) "skynet" 0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f32215fe3b0, rem=rem@entry=0x7f32215fe3b0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
  3    Thread 0x7f3220dfe640 (LWP 184334) "skynet" 0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f3220dfd3b0, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
  4    Thread 0x7f32205fd640 (LWP 184335) "skynet" 0x00007f3222fe8fde in epoll_wait (epfd=3, events=events@entry=0x7f32205fc020, maxevents=maxevents@entry=64, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
  5    Thread 0x7f321fdfc640 (LWP 184336) "skynet" __GI___libc_write (nbytes=112, buf=0x7f321f17ec00, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26
(gdb) thread 1
[Switching to thread 1 (Thread 0x7f3222ec1180 (LWP 184326))]
#0  __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:57
57	in ./nptl/futex-internal.c
(gdb) backtrace
#0  __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=128, abstime=0x0, clockid=0, expected=184333, futex_word=0x7f32215ff910) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f32215ff910, expected=184333, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=128) at ./nptl/futex-internal.c:139
#3  0x00007f3222f596a4 in __pthread_clockjoin_ex (threadid=139853285029440, thread_return=thread_return@entry=0x0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, block=block@entry=true) at ./nptl/pthread_join_common.c:105
#4  0x00007f3222f59543 in ___pthread_join (threadid=<optimized out>, thread_return=thread_return@entry=0x0) at ./nptl/pthread_join.c:24
#5  0x000000000042300f in start (thread=1) at skynet-src/skynet_start.c:227
#6  skynet_start (config=config@entry=0x7fff43e7e9c0) at skynet-src/skynet_start.c:289
#7  0x0000000000420218 in main (argc=<optimized out>, argv=<optimized out>) at skynet-src/skynet_main.c:166
(gdb) thread 2
[Switching to thread 2 (Thread 0x7f32215ff640 (LWP 184333))]
#0  0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f32215fe3b0, rem=rem@entry=0x7f32215fe3b0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
78	../sysdeps/unix/sysv/linux/clock_nanosleep.c: No such file or directory.
(gdb) backtrace
#0  0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f32215fe3b0, rem=rem@entry=0x7f32215fe3b0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
#1  0x00007f3222fad6e7 in __GI___nanosleep (req=req@entry=0x7f32215fe3b0, rem=rem@entry=0x7f32215fe3b0) at ../sysdeps/unix/sysv/linux/nanosleep.c:25
#2  0x00007f3222fad61e in __sleep (seconds=0, seconds@entry=1) at ../sysdeps/posix/sleep.c:55
#3  0x0000000000422cc0 in thread_monitor (p=0x7f3222a5d100) at skynet-src/skynet_start.c:106
#4  0x00007f3222f57b43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#5  0x00007f3222fe9a00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
(gdb) thread 3
[Switching to thread 3 (Thread 0x7f3220dfe640 (LWP 184334))]
#0  0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f3220dfd3b0, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
78	in ../sysdeps/unix/sysv/linux/clock_nanosleep.c
(gdb) backtrace
#0  0x00007f3222fa8868 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7f3220dfd3b0, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
#1  0x00007f3222fad6e7 in __GI___nanosleep (req=req@entry=0x7f3220dfd3b0, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/nanosleep.c:25
#2  0x00007f3222fdf0df in usleep (useconds=useconds@entry=2500) at ../sysdeps/posix/usleep.c:31
#3  0x0000000000422b92 in thread_timer (p=0x7f3222a5d100) at skynet-src/skynet_start.c:137
#4  0x00007f3222f57b43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#5  0x00007f3222fe9a00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
(gdb) thread 4
[Switching to thread 4 (Thread 0x7f32205fd640 (LWP 184335))]
#0  0x00007f3222fe8fde in epoll_wait (epfd=3, events=events@entry=0x7f32205fc020, maxevents=maxevents@entry=64, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
30	../sysdeps/unix/sysv/linux/epoll_wait.c: No such file or directory.
(gdb) backtrace
#0  0x00007f3222fe8fde in epoll_wait (epfd=3, events=events@entry=0x7f32205fc020, maxevents=maxevents@entry=64, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00000000004263c0 in sp_wait (max=64, e=0x7f3221600200, efd=<optimized out>) at skynet-src/socket_epoll.h:58
#2  socket_server_poll (ss=0x7f32216001c0, result=result@entry=0x7f32205fc3d0, more=more@entry=0x7f32205fc3cc) at skynet-src/socket_server.c:1652
#3  0x0000000000423f1b in skynet_socket_poll () at skynet-src/skynet_socket.c:84
#4  0x0000000000422b2e in thread_socket (p=0x7f3222a5d100) at skynet-src/skynet_start.c:68
#5  0x00007f3222f57b43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#6  0x00007f3222fe9a00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
(gdb) thread 5
[Switching to thread 5 (Thread 0x7f321fdfc640 (LWP 184336))]
#0  __GI___libc_write (nbytes=112, buf=0x7f321f17ec00, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26
26	../sysdeps/unix/sysv/linux/write.c: No such file or directory.
(gdb) backtrace
#0  __GI___libc_write (nbytes=112, buf=0x7f321f17ec00, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26
#1  __GI___libc_write (fd=1, buf=0x7f321f17ec00, nbytes=112) at ../sysdeps/unix/sysv/linux/write.c:24
#2  0x00007f3222f4df6d in _IO_new_file_write (f=0x7f32230dd780 <_IO_2_1_stdout_>, data=0x7f321f17ec00, n=112) at ./libio/fileops.c:1180
#3  0x00007f3222f4fa61 in new_do_write (to_do=112, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., fp=0x7f32230dd780 <_IO_2_1_stdout_>)
    at ./libio/libioP.h:947
#4  _IO_new_do_write (to_do=112, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., fp=0x7f32230dd780 <_IO_2_1_stdout_>) at ./libio/fileops.c:425
#5  _IO_new_do_write (fp=0x7f32230dd780 <_IO_2_1_stdout_>, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., to_do=112) at ./libio/fileops.c:422
#6  0x00007f3222f4e755 in _IO_new_file_xsputn (n=113, data=<optimized out>, f=<optimized out>) at ./libio/libioP.h:947
#7  _IO_new_file_xsputn (f=0x7f32230dd780 <_IO_2_1_stdout_>, data=<optimized out>, n=113) at ./libio/fileops.c:1196
#8  0x00007f3222f43057 in __GI__IO_fwrite (buf=buf@entry=0x7f321d388160, size=size@entry=1, count=113, fp=0x7f32230dd780 <_IO_2_1_stdout_>) at ./libio/libioP.h:947
#9  0x00000000004447d9 in luaB_print (L=0x7f321e315008) at lbaselib.c:32
#10 0x000000000042d9a0 in precallC (f=0x444750 <luaB_print>, nresults=0, func=<optimized out>, L=0x7f321e315008) at ldo.c:506
#11 luaD_precall (L=L@entry=0x7f321e315008, func=<optimized out>, func@entry=0x7f321bd571e0, nresults=0) at ldo.c:572
#12 0x000000000043b0f0 in luaV_execute (L=L@entry=0x7f321e315008, ci=<optimized out>, ci@entry=0x7f321c973340) at lvm.c:1638
#13 0x000000000042d4e3 in unroll (L=0x7f321e315008, ud=<optimized out>) at ldo.c:717
#14 0x000000000042cc2a in luaD_rawrunprotected (L=L@entry=0x7f321e315008, f=0x42daa0 <resume>, ud=0x7f321fdfacdc) at ldo.c:144
#15 0x000000000042dcf0 in lua_resume (L=0x7f321e315008, from=<optimized out>, nargs=4, nresults=0x7f321fdfad1c) at ldo.c:822
#16 0x00007f3222ebb9ed in ?? ()
#17 0x00007f321d9d1d80 in ?? ()
#18 0x0000000000000001 in ?? ()
#19 0x0000000000000001 in ?? ()
#20 0x0000000000000001 in ?? ()
#21 0x0000000000000000 in ?? ()
(gdb) backtrace
#0  __GI___libc_write (nbytes=112, buf=0x7f321f17ec00, fd=1) at ../sysdeps/unix/sysv/linux/write.c:26
#1  __GI___libc_write (fd=1, buf=0x7f321f17ec00, nbytes=112) at ../sysdeps/unix/sysv/linux/write.c:24
#2  0x00007f3222f4df6d in _IO_new_file_write (f=0x7f32230dd780 <_IO_2_1_stdout_>, data=0x7f321f17ec00, n=112) at ./libio/fileops.c:1180
#3  0x00007f3222f4fa61 in new_do_write (to_do=112, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., fp=0x7f32230dd780 <_IO_2_1_stdout_>)
    at ./libio/libioP.h:947
#4  _IO_new_do_write (to_do=112, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., fp=0x7f32230dd780 <_IO_2_1_stdout_>) at ./libio/fileops.c:425
#5  _IO_new_do_write (fp=0x7f32230dd780 <_IO_2_1_stdout_>, data=0x7f321f17ec00 "DEBUG [  msgagent]: {\n\t[1] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n\t[2] = {\n\t\t[\"ok\"] = true,\n\t\t[\"out\"] = 1,\n\t},\n997184\",\n\t\t},\n\t\t[2] = {\n\t\t\t[1] = \"srem\",\n\t\t\t[2] = \"main:cache:userdata\",\n\t\t\t[3] = 111719"..., to_do=112) at ./libio/fileops.c:422
#6  0x00007f3222f4e755 in _IO_new_file_xsputn (n=113, data=<optimized out>, f=<optimized out>) at ./libio/libioP.h:947
#7  _IO_new_file_xsputn (f=0x7f32230dd780 <_IO_2_1_stdout_>, data=<optimized out>, n=113) at ./libio/fileops.c:1196
#8  0x00007f3222f43057 in __GI__IO_fwrite (buf=buf@entry=0x7f321d388160, size=size@entry=1, count=113, fp=0x7f32230dd780 <_IO_2_1_stdout_>) at ./libio/libioP.h:947
#9  0x00000000004447d9 in luaB_print (L=0x7f321e315008) at lbaselib.c:32
#10 0x000000000042d9a0 in precallC (f=0x444750 <luaB_print>, nresults=0, func=<optimized out>, L=0x7f321e315008) at ldo.c:506
#11 luaD_precall (L=L@entry=0x7f321e315008, func=<optimized out>, func@entry=0x7f321bd571e0, nresults=0) at ldo.c:572
#12 0x000000000043b0f0 in luaV_execute (L=L@entry=0x7f321e315008, ci=<optimized out>, ci@entry=0x7f321c973340) at lvm.c:1638
#13 0x000000000042d4e3 in unroll (L=0x7f321e315008, ud=<optimized out>) at ldo.c:717
#14 0x000000000042cc2a in luaD_rawrunprotected (L=L@entry=0x7f321e315008, f=0x42daa0 <resume>, ud=0x7f321fdfacdc) at ldo.c:144
#15 0x000000000042dcf0 in lua_resume (L=0x7f321e315008, from=<optimized out>, nargs=4, nresults=0x7f321fdfad1c) at ldo.c:822
#16 0x00007f3222ebb9ed in ?? ()
#17 0x00007f321d9d1d80 in ?? ()
#18 0x0000000000000001 in ?? ()
#19 0x0000000000000001 in ?? ()
#20 0x0000000000000001 in ?? ()
#21 0x0000000000000000 in ?? ()
(gdb)

cloudwu · 2023-05-24T10:50:00Z

cloudwu
May 24, 2023
Maintainer

看起来你只有一个线程在跑 lua vm ，且停在了 io write 。可以考虑把 log 服务中的直接写文件换为调用 syslog 试试对比。
也可以多开一个工作线程，避免让本地 io 独占了 skynet 的所有工作线程。

还可以考虑用 skynet 的 cluster 把所有 log 都发到另外的节点去。

9 replies

ericzhanchina May 25, 2023
Author

C语言，我还停留在大学本科的阶段，不敢去写，不过我肯定会有时间学习这些基础的东西，也许再过一两年也能入个门。

云风说的用cluster将日志发到其他的节点，目的是卡也是卡在日志的节点，send过去，别影响我游戏的当前game节点，是这个意思吧

cloudwu May 25, 2023
Maintainer

因为如果你走网络发送 log ，log 是和其它网络消息一起处理的，所以不会特别卡住。写 log 本身有延迟并没有什么关系，专门用台机器去做也合理。

ericzhanchina May 25, 2023
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感谢云风的指点，产品正在小范围测试，快要上线了，我是策划转的服务器程序，因为这个endless loop问题搞得我多少有点儿慌，如果加台日志节点可以解决问题，就是极好的了 :)

terry8210 May 25, 2023

复合型人才。

ericzhanchina May 25, 2023
Author

复合型人才。

没办法，小团队，所以最近可能要经常来麻烦各位大佬。

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还是endless loop 的问题，附gdb attach到skynet进程的相关信息 #1754

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还是endless loop 的问题，附gdb attach到skynet进程的相关信息 #1754

ericzhanchina May 24, 2023

Replies: 1 comment · 9 replies

cloudwu May 24, 2023 Maintainer

ericzhanchina May 25, 2023 Author

cloudwu May 25, 2023 Maintainer

ericzhanchina May 25, 2023 Author

terry8210 May 25, 2023

ericzhanchina May 25, 2023 Author

ericzhanchina
May 24, 2023

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cloudwu
May 24, 2023
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ericzhanchina May 25, 2023
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cloudwu May 25, 2023
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ericzhanchina May 25, 2023
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ericzhanchina May 25, 2023
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