Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  implemented
  -triaged-in-20180711   |  Actual Points:
Parent ID:   | Points:  1
 Reviewer:  nickm|Sponsor:
 |  SponsorV-can
-+-
Changes (by nickm):

 * status:  needs_revision => closed
 * resolution:   => implemented


Comment:

 Looks good; merging!

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  nickm|Sponsor:
 |  SponsorV-can
-+-

Comment (by neel):

 In the PR, I added the requested line

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  nickm|Sponsor:
 |  SponsorV-can
-+-
Changes (by nickm):

 * status:  needs_review => needs_revision


Comment:

 Hi!  There's a fix I think we need in the second commit. Other than that,
 stuff looks fine here.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  nickm|Sponsor:
 |  SponsorV-can
-+-
Changes (by asn):

 * reviewer:   => nickm


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:   |Sponsor:
 |  SponsorV-can
-+-
Changes (by teor):

 * reviewer:  dgoulet =>


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by neel):

 * reviewer:   => dgoulet


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:   |Sponsor:
 |  SponsorV-can
-+-
Changes (by neel):

 * reviewer:  dgoulet =>


Comment:

 dgoulet told me that he's on vacation until the 16th. Would someone else
 be willing to review this patch?

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by neel):

 * status:  needs_revision => needs_review


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by neel):

 New PR is here: https://github.com/torproject/tor/pull/239

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by dgoulet):

 * status:  needs_review => needs_revision


Comment:

 True, `ExitRelay` won't work. I'm also not very enthusiastic on using
 `policy_is_reject_star()` which possibly goes over the entire policy just
 to learn if we are an Exit relay with a non reject policy.

 The Roles we've added recently for the callbacks in tor should be what we
 look for imo but don't have one for the Exit just yet (#25899).

 So for now, lets always run it, checking the HT size is very cheap and the
 OOM is only triggered on memory pressure so shouldn't be that often in
 most cases.

 Sorry neel, the PR looks good, just remove the `ExitRelay` condition :P.
 Thanks!

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by teor):

 Replying to [comment:23 dgoulet]:
 > Replying to [comment:22 neel]:
 > > If I have to make something, I am thinking about something like:
 `OOMHandlerClearOnlyDNS (0/1)` where 0 is the default (run all OOM checks)
 and 1 is to only run OOM on DNS (if you're an exit).
 >
 > Wait no, no need for that at all. What I was saying is that we should
 only run that OOM handler in the case tor is running as an Exit and one
 way to look at that is with `ExitRelay 1` global option ;).

 That's not how ExitRelay works:

 ExitRelay 0|1|auto

 Tells Tor whether to run as an exit relay. If Tor is running as a non-
 bridge server, and ExitRelay is set to 1, then Tor allows traffic to exit
 according to the ExitPolicy option (or the default ExitPolicy if none is
 specified).

 If ExitRelay is set to 0, no traffic is allowed to exit, and the
 ExitPolicy option is ignored.

 If ExitRelay is set to "auto", then Tor behaves as if it were set to
 1, but warns the user if this would cause traffic to exit. In a future
 version, the default value will be 0. (Default: auto)

 https://www.torproject.org/docs/tor-manual.html.en

 Instead, try something like:
 {{{
 smartlist_t *exit_policy = router_get_my_routerinfo()->exit_policy;
 if (!policy_is_reject_star(exit_policy, AF_INET) ||
 !policy_is_reject_star(exit_policy, AF_INET6)) {
   /* Run the OOM handler on DNS */
 }
 }}}

 But that won't handle OOM when the operator has turned exiting off, but
 used to have it on. So instead, maybe we should:
 * always run the OOM handler on DNS
 * check the approximate size of the DNS cache before running the OOM
 handler on it, or
 * set a flag when we run the OOM handler and we're not an exit, then clear
 the flag when we become an exit.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by neel):

 * status:  needs_revision => needs_review


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by neel):

 My new PR is here: https://github.com/torproject/tor/pull/235

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by neel):

 OK thanks for the clarification.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by dgoulet):

 Replying to [comment:22 neel]:
 > If I have to make something, I am thinking about something like:
 `OOMHandlerClearOnlyDNS (0/1)` where 0 is the default (run all OOM checks)
 and 1 is to only run OOM on DNS (if you're an exit).

 Wait no, no need for that at all. What I was saying is that we should only
 run that OOM handler in the case tor is running as an Exit and one way to
 look at that is with `ExitRelay 1` global option ;).

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-

Comment (by neel):

 Thank you so much for your feedback.

 My question is, what is that argument going to be called? If there is no
 name yet, should I create it?

 If I have to make something, I am thinking about something like:
 `OOMHandlerClearOnlyDNS (0/1)` where 0 is the default (run all OOM checks)
 and 1 is to only run OOM on DNS (if you're an exit).

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by dgoulet):

 * status:  needs_review => needs_revision


Comment:

 One comment to validate which could be an issue.

 Also, there is a potential argument to only run that OOM handler if you
 are an Exit like `options->ExitRelay`.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
-+-
 Reporter:  nickm|  Owner:  (none)
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.5.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  tor-dos, oom, tor-relay, dns, 035|  Actual Points:
  -triaged-in-20180711   |
Parent ID:   | Points:  1
 Reviewer:  dgoulet  |Sponsor:
 |  SponsorV-can
-+-
Changes (by dgoulet):

 * reviewer:   => dgoulet


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+---
 Reporter:  nickm  |  Owner:  (none)
 Type:  enhancement| Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  0.3.5.x-final
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:  SponsorV-can
---+---
Changes (by teor):

 * status:  new => needs_review
 * milestone:  Tor: unspecified => Tor: 0.3.5.x-final


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+--
 Reporter:  nickm  |  Owner:  (none)
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor: unspecified
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:  SponsorV-can
---+--

Comment (by cypherpunks):

 etrics-lib.patch attached to Ticket #26753 by karsten
 10:04 PM Ticket #26753 (Please update build dependencies for metrics-lib)
 created by karsten
 I'll attach a Git patch in a minute.
 9:59 PM Ticket #26710 (Update list of dependencies for metrics-lib that
 Jenkins uses) updated by karsten
 Owner, Status changed
 Alright, after making less progress on an unrelated ticket I did make
 …
 9:58 PM Ticket #26619 (Include in Tor Relay Guide doc instructions on how
 to deploy relay in ...) updated by nusenu
 thanks for adding it. this way users get tor 0.3.2.10, what is their …
 9:48 PM Ticket #25238 (Can't list all relays for a version when
 aggregating by version) updated by irl
 Status changed
 Fixed in …
 9:43 PM Ticket #26752 (Give cypherpunks account and other new accounts
 possibility of editing ...) created by cypherpunks
 seems like that's no longer the case, can we get that thing back?
 9:40 PM Ticket #25050 (add sum row at the bottom of the search results)
 updated by irl
 Status changed
 Fixed in …
 9:38 PM Ticket #26619 (Include in Tor Relay Guide doc instructions on how
 to deploy relay in ...) updated by ggus
 It's done.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+--
 Reporter:  nickm  |  Owner:  (none)
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor: unspecified
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:  SponsorV-can
---+--

Comment (by cypherpunks):

 Liberté Linux, Gentoo-based, lightweight, USB or SD, focus on stealth
 communication
 Live CD Best Practices, for users and devs alike
 Roll your own with Debian Live!, by torrclemeelmo
 Privatix LiveCD/USB, Debian +

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+--
 Reporter:  nickm  |  Owner:  (none)
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor: unspecified
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:  SponsorV-can
---+--

Comment (by neel):

 My PR is available here: https://github.com/torproject/tor/pull/223

 What I do for the OOM handler in this PR is that I clear the cache with
 `purge_expired_resolves()` with `now` as the current time, and increase
 the interval by an hour until either we cleared enough memory or there are
 no more entries.

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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+--
 Reporter:  nickm  |  Owner:  (none)
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor: unspecified
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:  SponsorV-can
---+--
Changes (by neel):

 * cc: neel@… (added)


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Re: [tor-bugs] #18642 [Core Tor/Tor]: Teach the OOM handler about the DNS cache

[Tor Bug Tracker & Wiki]

#18642: Teach the OOM handler about the DNS cache
---+--
 Reporter:  nickm  |  Owner:
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor: unspecified
Component:  Core Tor/Tor   |Version:
 Severity:  Normal | Resolution:
 Keywords:  tor-dos oom tor-relay dns  |  Actual Points:
Parent ID: | Points:  1
 Reviewer: |Sponsor:
---+--
Changes (by nickm):

 * keywords:  tor-dos => tor-dos oom tor-relay dns


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