#27813: Tor 0.3.4.8 is leaking memory -------------------------------------------------+------------------------- Reporter: anong | Owner: (none) Type: defect | Status: new Priority: Very High | Milestone: Tor: | 0.3.5.x-final Component: Core Tor/Tor | Version: Tor: | 0.3.4.8 Severity: Critical | Resolution: Keywords: regression? memleak oom | Actual Points: 034-backport tor-relay 035-must | Parent ID: | Points: Reviewer: | Sponsor: -------------------------------------------------+-------------------------
Comment (by Christian): Interesting. I stumbled across this report via tor-talk and appear to experience a similar issue. Non-exit node running on openSUSE Tumbleweed in VM with 1 GB RAM. Upgraded from tor-0.3.3.9 to tor-0.3.4.8 on September 16. Ever since tor gets killed twice a day by the OOM killer: {{{ OOM date 2 2018-02 23 2018-09 26 2018-10 }}} I can't really put more memory into the machine, so I tried to use [https://www.kernel.org/doc/Documentation/blockdev/zram.txt zram] and now [https://www.kernel.org/doc/Documentation/vm/zswap.txt zswap] to save some memory, but the OOM killer still thinks tor is using too much memory. Yesterday's OOM kill happend at 15:27 local time, so let's look at the memory usage around that time: {{{ $ sar -f /var/log/sa/sa20181015 -s 15:25 -e 15:30 -r -S Linux 4.18.12-1-default (cloud) 10/15/2018 _x86_64_ (2 CPU) 03:25:01 PM kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 03:26:01 PM 95876 21496 797884 79.11 6604 37264 380396 29.94 88728 87552 0 03:27:21 PM 865980 781032 53680 5.32 3748 21556 194388 15.30 9528 17088 36 03:28:01 PM 529876 560976 205424 20.37 5564 207108 333216 26.22 180396 184756 45472 03:29:01 PM 520572 560204 206152 20.44 6936 213964 333596 26.25 187636 187700 124 Average: 503076 480927 315785 31.31 5713 119973 310399 24.43 116572 119274 11408 03:25:01 PM kbswpfree kbswpused %swpused kbswpcad %swpcad 03:26:01 PM 23112 239028 91.18 688 0.29 03:27:21 PM 203400 58740 22.41 1932 3.29 03:28:01 PM 204168 57972 22.11 2048 3.53 03:29:01 PM 205192 56948 21.72 2848 5.00 Average: 158968 103172 39.36 1879 1.82 }}} (Yes, I'm running sadc every minute now because of this) So, I assume `%memused` went from 79.11% to 100% in a few seconds until tor was killed at 15:27:19 according to syslog. Swap usage (%swpused) is dangerously high with 91.18% -- however, I only switched to `zswap` a few days ago and used `zram` earlier, where %swpused would always < 60%, maybe tor was trying to allocate memory so quickly that `zram` could not keep up. Are there any tweaks besides [https://www.torproject.org/docs/tor-manual- dev.html.en#MaxMemInQueues MaxMemInQueues] to limit Tor's memory usage? -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27813#comment:19> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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