On Thu, 2014-12-18 at 12:46 -0500, Richard Guy Briggs wrote:
> On 14/12/18, Eric Paris wrote:
> > On Thu, 2014-12-18 at 11:45 -0500, valdis.kletni...@vt.edu wrote:
> > > On Tue, 16 Dec 2014 20:09:54 -0500, Valdis Kletnieks said:
> > > > Spotted these two while booting single-user on 20141216. 20141208
> > > > doesn't throw these, so it's something in the last week or so..
> > >
> > > Gaah! Turns out that 20141208 *is* susceptible - it had been booting
> > > just fine for several days, but it went around the bend, apparently due
> > > to a userspace or initrd change.
> >
> > $5 says you updated systemd?
> >
> > Richard?
>
> Ok, so if you are correct, then either we justify dropping the lock (I
> assume the one commone to both BUG reports [sig->cred_guard_mutex] ),
> or we make yet another queue were were hoping to avoid...
>
> It would also be good to narrow it down to a rule that triggers this.
I thought the first message was enough to find the problem, but:
static void kauditd_send_multicast_skb(struct sk_buff *skb)
{
...
nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, GFP_KERNEL);
...
}
Since kauditd_send_multicast_skb() gets called in audit_log_end(), which
can come from any context (aka even a sleeping context) you can't use
GFP_KERNEL. The audit_buffer know what context it should use. So pass
that down and use that.
-Eric
>
> > > egrep 'BUG|Linux vers' from my syslog:
> > >
> > > Dec 9 12:19:53 turing-police kernel: [ 0.000000] Linux version
> > > 3.18.0-next-20141208 (sou...@turing-police.cc.vt.edu) (gcc version 4.9.2
> > > 20141101 (Red Hat 4.9.2-1) (GCC) ) #27 SMP PREEMPT Mon Dec 8 22:20:07 EST
> > > 2014
> ...
> > > Dec 12 19:42:30 turing-police kernel: [ 0.000000] Linux version
> > > 3.18.0-next-20141208 (sou...@turing-police.cc.vt.edu) (gcc version 4.9.2
> > > 20141101 (Red Hat 4.9.2-1) (GCC) ) #27 SMP PREEMPT Mon Dec 8 22:20:07 EST
> > > 2014
> > > Dec 12 20:00:39 turing-police kernel: [ 1109.635328] BUG: sleeping
> > > function called from invalid context at mm/slab.c:2849
> ...
> > > Dec 12 20:42:47 turing-police kernel: [ 3633.863552] BUG: sleeping
> > > function called from invalid context at mm/slab.c:2849
> > > Dec 12 20:51:33 turing-police kernel: [ 0.000000] Linux version
> > > 3.18.0-next-20141208 (sou...@turing-police.cc.vt.edu) (gcc version 4.9.2
> > > 20141101 (Red Hat 4.9.2-1) (GCC) ) #27 SMP PREEMPT Mon Dec 8 22:20:07 EST
> > > 2014
> > > Dec 12 21:51:04 turing-police kernel: [ 3587.132867] BUG: sleeping
> > > function called from invalid context at mm/slab.c:2849
> ...
> > > I need to figure out what changed around 7:30PM on the 12th.
>
> - RGB
>
> --
> Richard Guy Briggs <rbri...@redhat.com>
> Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems,
> Red Hat
> Remote, Ottawa, Canada
> Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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