From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Linux Kernel List <linux-kernel@vger.kernel.org>
Cc: "Bryan O'Sullivan" <bos@serpentine.com>
Subject: 2.6.0-test4-mm6: locking imbalance with rtnl_lock/unlock?
Date: Sat, 06 Sep 2003 15:00:03 -0700 [thread overview]
Message-ID: <1062885603.24475.7.camel@ixodes.goop.org> (raw)
I've been playing with Bryan O'Sullivan's netplug daemon
(http://www.red-bean.com/~bos/). It uses netlink to look at carrier
state changes on network interfaces.
I'm seeing a problem however: after a while, all ifconfig commands just
block uninterruptably in __down(). From strace, it seems to be in:
ioctl(4, 0x8915...
which is SIOCGIFADDR. It seems to me the down() is actually the
rtnl_lock() called at net/ipv4/devinet.c:536 in devinet_ioctl. This
happens even when netplugd is no longer running. It looks like someone
isn't releasing the lock.
I'm going over all the uses of rtnl_lock() to see if I can find a
problem, but no sign yet. I wonder if someone might have broken this
recently: I'm running 2.6.0-test4-mm6, but I think Bryan is running an
older kernel (2.6.0-test4?), and hasn't seen any problems.
J
next reply other threads:[~2003-09-06 22:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-06 22:00 Jeremy Fitzhardinge [this message]
2003-09-06 22:24 ` Anton Blanchard
2003-09-07 1:47 ` Andrew Morton
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