1. 发完贴后自己讀一遍，问问自己别人读得懂吗？
2. 请表述清楚：什么 retain ？问题如何出现？
3. 文本不要放在（截图）图片里，学学 markdown 。

1. 发完贴后自己讀一遍，问问自己别人读得懂吗？
2. 请表述清楚：什么 retain ？问题如何出现？
3. 文本不要放在（截图）图片里，学学 markdown 。

jemalloc 的retain 参数设置为 false后，启动时候崩溃，以下是堆栈信息：

Program terminated with signal 6, Aborted.
#0 0x00007fd25082f387 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install glibc-2.17-317.el7.x86_64 libgcc-4.8.5-44.el7.x86_64 libuuid-2.23.2-63.el7.x86_64 zlib-1.2.7-18.el7.x86_64
(gdb) bt
#0 0x00007fd25082f387 in raise () from /lib64/libc.so.6
#1 0x00007fd250830a78 in abort () from /lib64/libc.so.6
#2 0x0000000000408635 in malloc_oom (size=size@entry=57757) at skynet-src/malloc_hook.c:152
#3 0x0000000000410c93 in malloc (size=size@entry=57757) at skynet-src/malloc_hook.c:217
#4 0x00007fd23afcd561 in seri (len=57757, b=0x7fd2451f4cc0, L=0x7fd1df24a808) at lualib-src/lua-seri.c:675
#5 luaseri_pack (L=0x7fd1df24a808) at lualib-src/lua-seri.c:746
#6 0x00000000004154f0 in luaD_precall (L=L@entry=0x7fd1df24a808, func=func@entry=0x7fd00f712d50, nresults=nresults@entry=-1) at ldo.c:434
#7 0x00000000004209fe in luaV_execute (L=L@entry=0x7fd1df24a808) at lvm.c:1130
#8 0x0000000000415270 in unroll (L=0x7fd1df24a808, ud=) at ldo.c:556
#9 0x0000000000414c5c in luaD_rawrunprotected (L=L@entry=0x7fd1df24a808, f=f@entry=0x4156c0 , ud=ud@entry=0x7fd2451f4f9c) at ldo.c:142
#10 0x00000000004158b7 in lua_resume (L=L@entry=0x7fd1df24a808, from=from@entry=0x7fd1ea0f8208, nargs=, nargs@entry=3) at ldo.c:664
#11 0x0000000000428d37 in auxresume (L=L@entry=0x7fd1ea0f8208, co=co@entry=0x7fd1df24a808, narg=3) at lcorolib.c:39
#12 0x0000000000429051 in luaB_coresume (L=0x7fd1ea0f8208) at lcorolib.c:60
#13 0x00000000004154f0 in luaD_precall (L=L@entry=0x7fd1ea0f8208, func=func@entry=0x7fd1e73111b0, nresults=nresults@entry=-1) at ldo.c:434
#14 0x0000000000420880 in luaV_execute (L=L@entry=0x7fd1ea0f8208) at lvm.c:1146
#15 0x00000000004157bf in luaD_call (L=L@entry=0x7fd1ea0f8208, func=, nResults=) at ldo.c:499
#16 0x0000000000415811 in luaD_callnoyield (L=0x7fd1ea0f8208, func=, nResults=) at ldo.c:509
#17 0x0000000000414c5c in luaD_rawrunprotected (L=L@entry=0x7fd1ea0f8208, f=f@entry=0x411990 <f_call>, ud=ud@entry=0x7fd2451f5280) at ldo.c:142
#18 0x0000000000415b1d in luaD_pcall (L=L@entry=0x7fd1ea0f8208, func=func@entry=0x411990 <f_call>, u=u@entry=0x7fd2451f5280, old_top=176, ef=) at ldo.c:729
#19 0x0000000000412ef1 in lua_pcallk (L=L@entry=0x7fd1ea0f8208, nargs=5, nresults=nresults@entry=-1, errfunc=errfunc@entry=0, ctx=ctx@entry=0, k=k@entry=0x427dc0 )
at lapi.c:972
#20 0x0000000000427f50 in luaB_pcall (L=0x7fd1ea0f8208) at lbaselib.c:424
#21 0x00000000004154f0 in luaD_precall (L=L@entry=0x7fd1ea0f8208, func=func@entry=0x7fd1e7311090, nresults=nresults@entry=2) at ldo.c:434
---Type to continue, or q to quit---
#22 0x00000000004209fe in luaV_execute (L=L@entry=0x7fd1ea0f8208) at lvm.c:1130
#23 0x00000000004157bf in luaD_call (L=L@entry=0x7fd1ea0f8208, func=, nResults=) at ldo.c:499
#24 0x0000000000415811 in luaD_callnoyield (L=0x7fd1ea0f8208, func=, nResults=) at ldo.c:509
#25 0x0000000000414c5c in luaD_rawrunprotected (L=L@entry=0x7fd1ea0f8208, f=f@entry=0x411990 <f_call>, ud=ud@entry=0x7fd2451f5530) at ldo.c:142
#26 0x0000000000415b1d in luaD_pcall (L=L@entry=0x7fd1ea0f8208, func=func@entry=0x411990 <f_call>, u=u@entry=0x7fd2451f5530, old_top=48, ef=) at ldo.c:729
#27 0x0000000000412ef1 in lua_pcallk (L=L@entry=0x7fd1ea0f8208, nargs=nargs@entry=5, nresults=nresults@entry=0, errfunc=errfunc@entry=1, ctx=ctx@entry=0, k=k@entry=0x0) at lapi.c:972
#28 0x00007fd23afc8da8 in _cb (context=0x7fd1ea10f580, ud=0x7fd1ea0f8208, type=1, session=3443, source=170, msg=0x7fd0da199960, sz=73) at lualib-src/lua-skynet.c:75
#29 0x000000000040a427 in dispatch_message (ctx=ctx@entry=0x7fd1ea10f580, msg=msg@entry=0x7fd2451f5610) at skynet-src/skynet_server.c:275
#30 0x000000000040afd4 in skynet_context_message_dispatch (sm=sm@entry=0x7fd251b202c0, q=0x7fd1ea0a9340, weight=weight@entry=1) at skynet-src/skynet_server.c:336
#31 0x000000000040b815 in thread_worker (p=) at skynet-src/skynet_start.c:163
#32 0x00007fd2516f7ea5 in start_thread () from /lib64/libpthread.so.0
#33 0x00007fd2508f796d in clone () from /lib64/libc.so.6

malloc_oom : https://github.com/cloudwu/skynet/blob/master/skynet-src/malloc_hook.c#L122-L127 内存分配返回了 NULL 。