#21312: Memory and file descriptor leaks in programs that use go-webrtc
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Reporter: arlolra | Owner: arlolra
Type: defect | Status: closed
Priority: High | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Major | Resolution: fixed
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by yawning):
Replying to [comment:64 dcf]:
> Replying to [comment:63 dcf]:
> > So instead, I'm just using ulimit like this:
> > {{{
> > ulimit -v 409600
> > exec chpst -u snowflake-proxy proxy-go
> > }}}
> > I originally gave each process 200 MB. But they were restarting (on
average once during the 15 minutes I was watching). So I then bumped it up
to 400 MB. Here are the timestamps:
>
> An update on this. `ulimit -v` (limit virtual memory) didn't work: it
would still cause a hang after a while even with 800 MB. (5/6 processes
had hung within about 10 hours.) I changed it to `ulimit -m` (limit
resident memory) with 200 MB and now it seems fine.
>
> `top` showed that with `ulimit -v`, the processes had all hung, rather
than crashed, when their virtual memory (`VIRT` column) was close to its
limit.
> {{{
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
> 12864 snowfla+ 20 0 1241148 56840 12464 S 11.0 2.8 14:24.84
proxy-go # no limit
> 12847 snowfla+ 20 0 810328 24952 13408 S 0.7 1.2 1:14.24
proxy-go # limit 819200
> 12848 snowfla+ 20 0 406892 21516 13376 S 0.0 1.0 0:11.57
proxy-go # limit 409600
> 12849 snowfla+ 20 0 398868 21208 13244 S 0.0 1.0 0:09.94
proxy-go # limit 409600
> 13340 snowfla+ 20 0 398864 21036 13228 S 0.0 1.0 0:24.22
proxy-go # limit 409600
> 13978 snowfla+ 20 0 408144 20784 13088 S 0.0 1.0 0:42.28
proxy-go # limit 409600
> }}}
Bad things may (probably will) happen regardless. See
https://github.com/golang/go/issues/5049 (Superseded by
https://github.com/golang/go/issues/16843).
The `runtime` and `runtime/debug` packages have methods for interacting
with the garbage collector/memory allocator that may work better.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:65>
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