kingluo commented on issue #7949:
URL: https://github.com/apache/apisix/issues/7949#issuecomment-1255799376
@hahayyum
If you could reproduce the issue at ease, you could use this gdb script to
check where's the possible leak.
**Note that use it with caution, you should test it in your test env, but
not production env!!!**
`/tmp/leak.gdb`
```gdb
set $cnt = 0
source luajit21.py
set logging off
shell rm -f /tmp/lua_mem.log
b lj_gc.c:875
command 1
set $cnt++
if $cnt == 1000
quit
end
pipe printf "-> alloc %p total=%d\n", p, g->gc.total | tee -a
/tmp/lua_mem.log >/dev/null
pipe lbt | tee -a /tmp/lua_mem.log >/dev/null
continue
end
b lj_alloc_free
command 2
pipe printf "-> free %p\n", ptr | tee -a /tmp/lua_mem.log >/dev/null
continue
end
continue
```
Here gdb script breaks the program in 1000 times and exit. You could change
it to fit your need.
Here is the demo:
```bash
cd /tmp
git glone https://github.com/api7/openresty-gdb-utils
cd openresty-gdb-utils
# determine the pid of your worker process, e.g. 3338439
# it's recommanded to set worker_processes 1
PYTHONPATH=$PWD command gdb -iex 'set pagination off' -batch-silent -x
/tmp/leak.gdb -p 3338439
```
Lauch your workload.
**Here is my demo workload:**
For example, `apisix/leak.lua`
```lua
local sock = require("socket")
local _M = {}
local t = {}
local function foo()
for i=1,500 do
-- local tt = {}
-- for j=1,1000 do
-- tt[j]=j
-- end
table.insert(t, {i=i})
end
end
function _M.run()
ngx.say("start")
for i=1,333 do
ngx.say("loop", i)
ngx.flush(true)
foo()
sock.sleep(3)
ngx.say(#t)
end
end
return _M
```
```bash
curl http://127.0.0.1:9180/apisix/admin/routes/leak -H 'X-API-KEY:
edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
"uri": "/leak",
"plugins": {
"serverless-pre-function": {
"phase": "rewrite",
"functions" : ["local demo = require(\"apisix.leak\"); return
function() demo.run(); ngx.say(\"ok\"); end"]
}
}
}'
curl localhost:9080/leak
```
In my demo, I could check where my demo script allocate so many memory:
```bash
tail -100 /tmp/lua_mem.log
-> alloc 0x7fc33fce8500 total=11437441
@/opt/apisix.fork/apisix/leak.lua:7
@/opt/apisix.fork/apisix/leak.lua:22
local demo = require("apisix.leak"); return function() demo.run();
ngx.say("ok"); end:1
@/opt/apisix.fork/apisix/plugins/serverless/init.lua:84
@/opt/apisix.fork/apisix/plugin.lua:918
@/opt/apisix.fork/apisix/init.lua:442
=access_by_lua(nginx.conf:347):2
-> alloc 0x7fc33fce8580 total=11437553
@/opt/apisix.fork/apisix/leak.lua:7
@/opt/apisix.fork/apisix/leak.lua:22
local demo = require("apisix.leak"); return function() demo.run();
ngx.say("ok"); end:1
@/opt/apisix.fork/apisix/plugins/serverless/init.lua:84
@/opt/apisix.fork/apisix/plugin.lua:918
@/opt/apisix.fork/apisix/init.lua:442
=access_by_lua(nginx.conf:347):2
-> alloc 0x7fc33fce8600 total=11437665
@/opt/apisix.fork/apisix/leak.lua:7
@/opt/apisix.fork/apisix/leak.lua:22
local demo = require("apisix.leak"); return function() demo.run();
ngx.say("ok"); end:1
@/opt/apisix.fork/apisix/plugins/serverless/init.lua:84
@/opt/apisix.fork/apisix/plugin.lua:918
@/opt/apisix.fork/apisix/init.lua:442
```
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