[lkml]   [2011]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
Le lundi 21 novembre 2011 à 18:35 +0100, Markus Trippelsdorf a écrit :

> New one:


I was just wondering if you were using CONFIG_CGROUPS=y, and if yes, if
you could try to disable it.

css_get_next() looks very buggy, the read_lock()/read_unlock() protects
nothing at all, RCU rules are not respected.

commit c1e2ee2dc43657 (memcg: replace ss->id_lock with a rwlock) missed
the point of doing a true RCU conversion to get even better results, and
fact that previous code was buggy as well.

[ After rcu lookup, we must get a stable reference, then recheck the
key , or else we can manipulate something that was queued for deletion.]

An example of a correct RCU conversion was done in commit 8af088710d1
(posix-timers: RCU conversion)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2011-11-21 19:41    [W:0.091 / U:2.716 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site