From: Thomas Graf <tgraf@suug.ch>
To: Patrick McHardy <kaber@trash.net>
Cc: davem@davemloft.net, netdev@oss.sgi.com, spam@crocom.com.pl,
kuznet@ms2.inr.ac.ru, jmorris@redhat.com
Subject: Re: [PATCH] PKT_SCHED: Initialize list field in dummy qdiscs
Date: Fri, 5 Nov 2004 20:43:03 +0100 [thread overview]
Message-ID: <20041105194303.GA12289@postel.suug.ch> (raw)
In-Reply-To: <418BC40E.8080402@trash.net>
* Patrick McHardy <418BC40E.8080402@trash.net> 2004-11-05 19:18
> Yes, but there doesn't seem to be a path where this is true.
I will double check this, there must be something wrong with
one of the callers to qdisc_destroy since it's the only way
entries can be removed from qdisc_list and otherwise the oops wouldn't
show up with the POISON1.
> __qdisc_destroy is called from a rcu-callback, not directly from
> qdisc_destroy.
You're indeed right, I haven't noticed queue_lock being a softirq
spinlock, stupid me.
So to have qdisc_destroy be reliable we should either make sure
dev->queue_lock is held for every call or switch to list_del_rcu.
since qdisc_destroy might be called from bh context.
I will audit all paths, I'm pretty sure the reported oops is
somehow related to this.
next prev parent reply other threads:[~2004-11-05 19:43 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-05 9:48 PROBLEM: IProute hangs after running traffic shaping scripts Szymon Miotk
2004-11-05 11:54 ` Thomas Graf
2004-11-05 14:16 ` [PATCH] PKT_SCHED: Initialize list field in dummy qdiscs Thomas Graf
2004-11-05 16:12 ` Patrick McHardy
2004-11-05 16:39 ` Thomas Graf
2004-11-05 17:26 ` Patrick McHardy
2004-11-05 17:58 ` Thomas Graf
2004-11-05 18:18 ` Patrick McHardy
2004-11-05 19:43 ` Thomas Graf [this message]
2004-11-06 1:18 ` Thomas Graf
2004-11-06 1:47 ` Patrick McHardy
2004-11-06 1:59 ` Thomas Graf
2004-11-06 14:50 ` Thomas Graf
2004-11-07 8:57 ` Patrick McHardy
2004-11-07 14:00 ` Thomas Graf
2004-11-07 16:19 ` Patrick McHardy
2004-11-07 16:33 ` Thomas Graf
2004-11-07 17:02 ` Patrick McHardy
2004-11-07 17:49 ` Thomas Graf
2004-11-07 18:22 ` Patrick McHardy
2004-11-07 19:08 ` Thomas Graf
2004-11-06 0:36 ` David S. Miller
2004-11-07 22:22 ` PROBLEM: IProute hangs after running traffic shaping scripts Patrick McHardy
2004-11-08 1:40 ` Patrick McHardy
2004-11-08 13:54 ` Thomas Graf
2004-11-08 16:12 ` Patrick McHardy
2004-11-08 18:33 ` Thomas Graf
2004-11-08 19:46 ` Patrick McHardy
2004-11-08 20:15 ` Thomas Graf
2004-11-10 0:18 ` David S. Miller
2004-11-10 0:40 ` Patrick McHardy
2004-11-10 0:55 ` Patrick McHardy
2004-11-10 6:13 ` David S. Miller
2004-11-10 12:08 ` Szymon Miotk
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