From: Francois Romieu <romieu@fr.zoreil.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jeff Garzik <jgarzik@redhat.com>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
"David S. Miller" <davem@redhat.com>
Subject: Re: [lock validator] drivers/net/8139too.c: deadlock?
Date: Fri, 27 Jan 2006 01:35:11 +0100 [thread overview]
Message-ID: <20060127003511.GA10871@electric-eye.fr.zoreil.com> (raw)
In-Reply-To: <20060126224312.GA2779@elte.hu>
Ingo Molnar <mingo@elte.hu> :
[...]
> i'm wondering, is this a genuine deadlock, or a false positive? The
> dependency chain is quite complex, but looks realistic:
>
> -> #4 {&dev->xmit_lock}: [<c045294b>] dev_watchdog+0x1b/0xc0
> -> #3 {&dev->queue_lock}: [<c0447154>] dev_queue_xmit+0x64/0x290
> -> #2 {&((sk)->sk_lock.slock)}: [<c043eb66>] sk_clone+0x66/0x200
> -> #1 {&((sk)->sk_lock.slock)}: [<c047a116>] tcp_v4_rcv+0x726/0x9d0
> -> #0 {&tp->rx_lock}: [<c033e460>] rtl8139_tx_timeout+0x110/0x1f0
It looks like watchdog racing against rx_poll (which should/can not
happen). Do you have something specific in mind ?
--
Ueimor
next prev parent reply other threads:[~2006-01-27 0:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-26 22:43 Ingo Molnar
2006-01-27 0:35 ` Francois Romieu [this message]
2006-01-27 2:22 ` Herbert Xu
2006-01-27 2:44 ` Jeff Garzik
2006-01-31 0:24 ` [PATCH] 8139too: fix a TX timeout watchdog thread against NAPI softirq race Francois Romieu
2006-01-31 18:49 ` Ingo Molnar
2006-01-31 18:57 ` Ingo Molnar
2006-02-01 0:55 ` Andrew Morton
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