Move long scans to secondary threads
|Reported by:||gyoung||Owned by:||gyoung|
The freeze occurred when FM/2 tried to scan a network drive that is setup using the netdrive samba plugin. Normally if it has problems it returns an error 65. However, the system the drive was on had locked up and when fm/2 scanned it the WPS froze and I had to kill FM/2. The only way I could reopen FM/2 was to exclude the 2 drives. After I rebooted the other machine all works fine. The WPS drives object opened without problem it showed the 2 netdrive drives as empty but no freeze occurred. The same error message as below occurred again but I think the message was generated when I tried to kill FM/2 not when the freeze occurred.
Most of the scans that can take a long time are done on separate threads, so this kind of failure will not lock up fm/2. However, there are a few that are still done on the PM thread and this can cause apparent Desktop lockups. If this is the case, pressing Ctrl-Esc several times should cause PM to take control away from fm/2.
If we can identify what fm/2 was trying to do, we should be able to move this logic to a thread.
The trap should not occur, even with slow access. Unfortunately, the trap is not within fm/2 code, so it's hard to analyze without a process dump. I will be adding exceptq support to fm/2, once I get some in-progress exceptq rework completed. This will provide enhanced trap logging, without the need to resort to trap dumps.
The trap appears to somewhere in DOSREADASYNC or DOSWRITEASYNC, but that does not tell us much about where and how fm/2 managed to pass bad arguments to the API.
Change History (15)
comment:1 Changed 9 years ago by stevenhl
- Summary changed from Move long scans to secondary treads to Move long scans to secondary threads
comment:6 Changed 9 years ago by stevenhl
- Milestone changed from Release_3.7 to Release_3.8
- Version changed from 3.07 to 3.08