Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+--
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+--

Comment (by cypherpunks):

 Replying to [comment:7 dcf]:
 > cypherpunks, is it better for you now?
 It's much better now, thanks cohosh and family, though you should probably
 consult with your logs on whether any proxy is deadlocking instead of my
 imprecise observations next time.

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+--
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+--

Comment (by dcf):

 cypherpunks, is it better for you now?

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+--
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+--
Changes (by cohosh):

 * status:  assigned => needs_review


Comment:

 (putting this in needs review to have someone else confirm that #30206
 resolved the issue)

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+---

Comment (by cohosh):

 Okay I've deployed the fix described in #30206, and it looks to be working
 on my end. Let me know if you still get hangs from the proxy.

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+---

Comment (by cohosh):

 Yup, this an issue with the proxy-go deadlocking patch. It's also already
 reported here #30206. Moving to that ticket.

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+---

Comment (by cohosh):

 I'm now able to reliably reproduce this with a large (100MB) file
 download. The download stalls and the client reports no incoming bytes,
 closes the connection, and requests another snowflake.
 {{{
 2019/04/25 20:11:48 WebRTC: No messages received for 30 seconds -- closing
 stale connection.
 2019/04/25 20:11:48 WebRTC: closing DataChannel
 2019/04/25 20:11:48 WebRTC: DataChannel.OnClose [locally]
 2019/04/25 20:11:48 WebRTC: closing PeerConnection
 2019/04/25 20:11:48 WebRTC: Closing
 2019/04/25 20:11:48 copy loop ended
 }}}

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+---

Comment (by cypherpunks):

 Replying to [comment:1 cohosh]:
 > I'm having trouble reproducing the every 7min behaviour,

 I said on average, sometimes it can be 30min sometimes just 4min.

 > but I do see the usual timeouts after 30s of inactivity (#25429).

 I can rule that out since I send a small request every 15s or so.

 Maybe try to upload a very large file (5Go) and at some point I'm sure
 your connection to the snowflake will go down.

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Re: [tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal | Resolution:
 Keywords:  snowflake  |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:  Sponsor19
---+---

Comment (by cohosh):

 I'm having trouble reproducing the every 7min behaviour, but I do see the
 usual timeouts after 30s of inactivity (#25429). It's possible this has a
 noticeable affect on the browsing experience if the user makes a new
 request right as the client is timing out.

 In any case, this seems to be a client-side issue rather than with the
 proxies. There's two possible quick solutions:
 1. We could set the timeout to a much larger values as suggested in #25429
 2. We could set the snowflake client option `-max 2` or some number higher
 than the default of 1. I'm not entirely sure whether this will help but
 the source code seems to suggest that we will then collect 2 snowflakes
 and can switch to the other one when one snowflake stops working (or times
 out).

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[tor-bugs] #30258 [Obfuscation/Snowflake]: Snowflake proxy stops working during browsing session

[Tor Bug Tracker & Wiki]

#30258: Snowflake proxy stops working during browsing session
---+---
 Reporter:  cohosh |  Owner:  cohosh
 Type:  defect | Status:  assigned
 Priority:  Medium |  Milestone:
Component:  Obfuscation/Snowflake  |Version:
 Severity:  Normal |   Keywords:  snowflake
Actual Points: |  Parent ID:
   Points: |   Reviewer:
  Sponsor:  Sponsor19  |
---+---
 This was a comment on #25688:
 > I'm still not a 100% sure but each 7min or so it sure looks like the
 snowflake is deadlocking (or something else?) while I'm being connected
 and I get another one, this is very visible in my browsing experience. It
 would be great if you could investigate this.

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