Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a race

From	Dominique Martinet <dominique.martinet@cea.fr>
Newsgroups	linux.kernel
Subject	Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a race
Date	2015-12-09 07:30 +0100
Message-ID	<qDGqd-4EB-5@gated-at.bofh.it> (permalink)
References	(1 earlier) <qD9ui-eC-9@gated-at.bofh.it> <qDcVc-2rG-9@gated-at.bofh.it> <qDfT3-4w8-1@gated-at.bofh.it> <qDgm5-4Et-13@gated-at.bofh.it> <qDzf3-8k5-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Andy Lutomirski wrote on Tue, Dec 08, 2015:
> Trace attached.  I don't see anything wrong, but I also don't know
> what I'm looking for.

Actually doesn't look good, not sure if trace could be missing messages
but it looks like tags get reused...

Quick and dirty parse script (attached output, it doesn't handle TFLUSH
but there are none in his message):

awk '{print NR " " $0}' 9ptrace.txt | \
awk '/^[0-9]* T/ {
	if ($5 in tag) {
		print "DOUBLETAG " $0 " || had " tag[$5];
    } else {
		tag[$5] = $0;
	}
}
/^[0-9]* R/ {
	if (! $5 in tag ) {
		print "MISSTAG " $0;
	} else {
		delete tag[$5];
	}
}'


-- 
Dominique Martinet

Thread

Hang triggered by udev coldplug, looks like a race Andy Lutomirski <luto@amacapital.net> - 2015-12-04 07:00 +0100
  Re: Hang triggered by udev coldplug, looks like a race Andy Lutomirski <luto@amacapital.net> - 2015-12-07 20:20 +0100
    Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a  race Dominique Martinet <dominique.martinet@cea.fr> - 2015-12-08 00:00 +0100
      Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a  race Al Viro <viro@ZenIV.linux.org.uk> - 2015-12-08 03:40 +0100
        Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a race Andy Lutomirski <luto@amacapital.net> - 2015-12-08 23:50 +0100
          Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a  race Dominique Martinet <dominique.martinet@cea.fr> - 2015-12-09 07:30 +0100
            Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a  race Dominique Martinet <dominique.martinet@cea.fr> - 2015-12-09 07:50 +0100
            Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a  race Al Viro <viro@ZenIV.linux.org.uk> - 2015-12-09 07:50 +0100

csiph-web