tft_demo task crashed by network error ?

[davidg238]

Describe the bug
The tft_demo task was running, when a repeated network error occurred and crashed the task

To reproduce
The tft_demo was running for an extended period and was at iteration 130200.
Exceptions were logged, as below, at 15:40:45, 16:00:45, 16:23:32 and17:31:46.
On the 4th occurrence of the error, the tft_demo screen froze.
Max offline is configured as 0s

Expected behavior
(Your) tft_demo has no network IO or print statements, so I would not expect it to crash, unless the whole device runtime crashed?

Screenshots

EXCEPTION error. 
Host name lookup failure
  0: dns_lookup_result_        system/modules/dns.toit:27:3
  1: dns_lookup                system/modules/dns.toit:16:25
  2: WifiNetworkInterface.resolve system/components/wifi.toit:81:16
  3: ntp_synchronize.<block>   system/kernel/ntp.toit:32:20
  4: ntp_synchronize           system/kernel/ntp.toit:28:1
  5: ConsoleConnector.process_idle_.<block> system/kernel/console_connector.toit:389:10
  6: catch.<block>             <sdk>/core/exceptions.toit:111:10
  7: catch                     <sdk>/core/exceptions.toit:109:1
  8: catch                     <sdk>/core/exceptions.toit:60:10
  9: ConsoleConnector.process_idle_ system/kernel/console_connector.toit:387:5
 10: ConsoleConnector.run.<block>.<block>.<block>.<block> system/kernel/console_connector.toit:244:17
 11: Task_.with_deadline_.<block> <sdk>/core/task.toit:77:21
 12: Task_.with_deadline_      <sdk>/core/task.toit:71:3
...
 20: ConsoleConnector.run.<block> system/kernel/console_connector.toit:212:37
 21: Connection.with_client.<block>.<block> system/kernel/connection.toit:42:14
 22: Connection.with_client.<block> system/kernel/connection.toit:39:61
 23: Network.connect_and_run.<block> system/kernel/network.toit:77:10
 24: Network.connect_and_run   system/kernel/network.toit:65:3
 25: Connection.with_client    system/kernel/connection.toit:39:13
 26: ConsoleConnector.run      system/kernel/console_connector.toit:212:10
 27: ConsoleSyncJob.run_.<block>.<block> system/kernel/scheduler.toit:430:28
 28: catch.<block>             <sdk>/core/exceptions.toit:111:10
 29: catch                     <sdk>/core/exceptions.toit:109:1
 30: catch                     <sdk>/core/exceptions.toit:84:10
 31: ConsoleSyncJob.run_.<block> system/kernel/scheduler.toit:429:13
 32: ConsoleSyncJob.run_       system/kernel/scheduler.toit:426:3
 33: ConsoleSyncJob.start.<lambda>.<block> system/kernel/scheduler.toit:424:43
 34: catch.<block>             <sdk>/core/exceptions.toit:111:10
 35: catch                     <sdk>/core/exceptions.toit:109:1
 36: catch                     <sdk>/core/exceptions.toit:60:10
 37: ConsoleSyncJob.start.<lambda> system/kernel/scheduler.toit:424:28

SDK and console version (please complete the following information):
Run toit version

• Version [e.g. v0.15.3]

david (master *) fw_keyboard $ toit version
+---------+------------+
| VERSION |    DATE    |
+---------+------------+
| v1.8.0  | 2021-08-16 |
+---------+------------+

device firmware is v1.2.0

Additional context
Add any other context about the problem here.