[frameworks-kcoreaddons] [Bug 423818] KDirWatch's useFam loops indefinitely (actual fam, not gamin)

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=423818

Harald Sitter <sitter at kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |REPORTED
          Component|general                     |general
         Resolution|WAITINGFORINFO              |---
           Assignee|dolphin-bugs-null at kde.org   |mpyne at kde.org
            Summary|After some time no kde      |KDirWatch's useFam loops
                   |application cant open, to   |indefinitely (actual fam,
                   |many open files             |not gamin)
            Version|20.04.2                     |unspecified
                 CC|                            |kdelibs-bugs at kde.org
            Product|dolphin                     |frameworks-kcoreaddons

--- Comment #11 from Harald Sitter <sitter at kde.org> ---
Thanks. Unfortunately I can't reproduce this.

Given the backtrace what appears to happen is that since inotify is not
functional, because we've exhausted the inotify instance cap, the file
monitoring will fall back to a different system called FAM and that has a loop
that has potential to never exit it looks like. A user needs to manually
install the FAM daemon to actually cause this behavior though, at least on
neon.

>     do {
>       famEventReceived();
>       if (startedFAMMonitor && !e->m_famReportedSeen) {
>         // 50 is ~half the time it takes to setup a watch.  If gamin's latency
>         // gets better, this can be reduced.
>         QThread::msleep(50);
>       }
>     } while (startedFAMMonitor &&!e->m_famReportedSeen);

^ if m_famReportedSeen is never true, that loop never terminates. I'm not quite
sure why that would happen but in any event there ought to be a cap on how long
we are willing to wait which should then solve the problem that apps deadlock.

Moving bug to correct product.

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