Messages in this thread | | | Subject | 2.6.0-test4-mm6: locking imbalance with rtnl_lock/unlock? | From | Jeremy Fitzhardinge <> | Date | Sat, 06 Sep 2003 15:00:03 -0700 |
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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
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