[tor-bugs] #2344 [Tor Client]: Crash after failing to write to the state file

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#2344: Crash after failing to write to the state file
------------------------+---------------------------------------------------
 Reporter:  special     |       Owner:                     
     Type:  defect      |      Status:  new                
 Priority:  normal      |   Milestone:                     
Component:  Tor Client  |     Version:  Tor: 0.2.2.19-alpha
 Keywords:              |      Parent:                     
------------------------+---------------------------------------------------
 Approximately once per day since installing 0.2.2.20-alpha, Tor has
 crashed shortly after (but not immediately after) failing to write the
 state file:

 {{{
 Dec 29 21:26:49.373 [Warning] Error replacing
 "C:\Users\xxx\AppData\Roaming\tor\state": Permission denied
 Dec 29 21:26:49.375 [Warning] Unable to write state to file
 "C:\Users\xxx\AppData\Roaming\tor\state"
 Dec 29 21:26:49.484 [Info] circuit_finish_handshake(): Finished building
 circuit hop:
 Dec 29 21:26:49.489 [Info] internal circ xxx
 Dec 29 21:26:49.493 [Info] circuit_build_times_disabled():
 CircuitBuildTime learning is disabled. Consensus=0, Config=0, AuthDir=0,
 StateFile=1
 Dec 29 21:26:49.498 [Info] circuit_send_next_onion_skin(): circuit built!
 Dec 29 21:26:49.503 [Info] connection_ap_handshake_attach_circuit(): Intro
 circ 38291 present and awaiting ack (rend 38292). Stalling. (stream 50 sec
 old)
 Dec 29 21:26:49.507 [Info] circuit_finish_handshake(): Finished building
 circuit hop:
 Dec 29 21:26:49.510 [Info] internal circ xxx # different circuit from the
 first time
 Dec 29 21:26:49.514 [Info] circuit_build_times_disabled():
 CircuitBuildTime learning is disabled. Consensus=0, Config=0, AuthDir=0,
 StateFile=1
 Dec 29 21:26:49.519 [Info] circuit_send_next_onion_skin(): circuit built!
 Dec 29 21:26:49.523 [Info] connection_ap_handshake_attach_circuit(): Intro
 circ 38291 present and awaiting ack (rend 38292). Stalling. (stream 50 sec
 old)
 # Crashed
 }}}

 I suspect that this is related to the CircuitBuildTime being disabled, as
 that seems to be the only meaningful side effect of a state file write
 failure. I don't know of any reason for Tor to periodically get
 'Permission denied' when trying to replace the state file.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2344>
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