[Dovecot] Re: Dovecot inotify problem

[Johannes Berg]

Hi Reuben,

I hope you don't mind me copying the dovecot list again.

> dovecot: Aug 21 04:08:22 Error: IMAP(reuben): inotify_rm_watch() failed: 
> Invalid argument

Odd.

> This is with a 2.6.13-rc6-mm1 release.  I've posted to LKML because there is 
> also a kernel stack produced at one point which looks inotify related (but the 
> messages above are contant).
> See http://www.ussg.iu.edu/hypermail/linux/kernel/0508.2/1180.html and the 
> followup from akpm.

Thanks for the link. I don't think akpm is right, unless something is
really odd here. Could you add debugging output for me please?

Maybe something like (this is not a patch you can apply, look at line
164 in src/lib/ioloop-notify-inotify.c)

        ctx->inotify_fd = inotify_init();
+	i_warning("inotify_init returned fd %d", ctx->inotify_fd);
        if (ctx->inotify_fd == -1) {

and line 106:
                                            IN_CLOSE | IN_MODIFY);
+	i_warning("inotify_add_watch returned %d", watchdescriptor);
        if (watchdescriptor < 0) {
and line 145:
        }
+	inotify_rm_watch("removing wd %d from inotify fd %d", io->notify_context, ctx->inotify_fd);
        if (inotify_rm_watch(ctx->inotify_fd, io->notify_context) < 0)

Or something similar.

If that doesn't help and output looks consistent (we're not removing a
watch descriptor from a wrong fd etc.), can you try removing the
fd_close_on_exec call please (line 171)? I don't know if that could
cause trouble (I don't even think that the imap binary ever forks) but
you never know.

johannes
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