Bug 255204 - mountd: sometimes ignores SIGHUP with NFS 4 shares
Summary: mountd: sometimes ignores SIGHUP with NFS 4 shares
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: 12.2-RELEASE
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-04-19 02:31 UTC by Alan Somers
Modified: 2021-04-19 02:31 UTC (History)
0 users

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Description Alan Somers freebsd_committer 2021-04-19 02:31:50 UTC
When it receives SIGHUP mountd is supposed to reload the exports list.  But in my experience, it sometimes does not.  Sending additional SIGHUPs does not help, so I don't think it's due to a race.  Restarting mountd is the only cure.  Additional observations:

* Observed on 12.2-RELEASE, so it's not related to bug 246597
* Observed with NFS 4.0 Linux clients.  I think I've seen it with 4.1, too.  I've never seen it with NFS 3.
* The usual presentation is that I mount a client from a disallowed IP address, and the client gets EIO trying to access the share.  Then I edit the source dataset's sharenfs property (which sends SIGHUP to mountd), but the client still gets EIO.  I have to restart mountd to fix it.

The next time this happens, I'll try to debug it in place.