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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151209062316.GA29917@nautica>
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

Download attachment "9pdoubles.xz" of type "application/octet-stream" (5524 bytes)