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

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Date:	Wed, 9 Dec 2015 07:23:16 +0100
From:	Dominique Martinet <dominique.martinet@....fr>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	V9FS Developers <v9fs-developer@...ts.sourceforge.net>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a
 race

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

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