Messages in this thread Patch in this message | | | Date | Fri, 12 Dec 2008 02:05:21 +0300 | From | Evgeniy Polyakov <> | Subject | Re: [Bugme-new] [Bug 12201] New: long wait in call_usermodehelper() / queue_work() / wait_for_completion() |
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On Fri, Dec 12, 2008 at 01:51:58AM +0300, Evgeniy Polyakov (zbr@ioremap.net) wrote: > > > If I write a small pilot program that calls socket(PF_NETLINK, SOCK_RAW, > > > NETLINK_AUDIT), it will delay by 1-2 seconds 100% of the time (assuming server > > > has been online for a while). Certain protocol types given to socket() have > > > zero delay (because no module needs to be loaded). > > > > > > Steps to reproduce: > > > Once server has been online for a while, a simple call to socket(PF_NETLINK, > > > SOCK_RAW, NETLINK_AUDIT) shows the problem. > > > > OK, weird. > > > > Please get sysrq working then get us a task trace, so we can see who is > > sleeping where. Do this: > > > > > > - run your "small pilot program" > > Or send it to us and we will quickly fix the bug :) > > Thank you!
Btw, does this ugly hack fix the problem? According to your description it may be the case.
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 480184a..2b64eb5 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -434,6 +434,10 @@ static int netlink_create(struct net *net, struct socket *sock, int protocol) if (protocol < 0 || protocol >= MAX_LINKS) return -EPROTONOSUPPORT; +#ifndef CONFIG_AUDIT + if (protocol == NETLINK_AUDIT) + return -EPROTONOSUPPORT; +#endif netlink_lock_table(); #ifdef CONFIG_MODULES if (!nl_table[protocol].registered) {
-- Evgeniy Polyakov
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