3.16.72-rc1 review patch. If anyone has any objections, please let me know.
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From: Mel Gorman mgorman@techsingularity.net
commit 0e9f02450da07fc7b1346c8c32c771555173e397 upstream.
A NULL pointer dereference bug was reported on a distribution kernel but the same issue should be present on mainline kernel. It occured on s390 but should not be arch-specific. A partial oops looks like:
Unable to handle kernel pointer dereference in virtual kernel address space ... Call Trace: ... try_to_wake_up+0xfc/0x450 vhost_poll_wakeup+0x3a/0x50 [vhost] __wake_up_common+0xbc/0x178 __wake_up_common_lock+0x9e/0x160 __wake_up_sync_key+0x4e/0x60 sock_def_readable+0x5e/0x98
The bug hits any time between 1 hour to 3 days. The dereference occurs in update_cfs_rq_h_load when accumulating h_load. The problem is that cfq_rq->h_load_next is not protected by any locking and can be updated by parallel calls to task_h_load. Depending on the compiler, code may be generated that re-reads cfq_rq->h_load_next after the check for NULL and then oops when reading se->avg.load_avg. The dissassembly showed that it was possible to reread h_load_next after the check for NULL.
While this does not appear to be an issue for later compilers, it's still an accident if the correct code is generated. Full locking in this path would have high overhead so this patch uses READ_ONCE to read h_load_next only once and check for NULL before dereferencing. It was confirmed that there were no further oops after 10 days of testing.
As Peter pointed out, it is also necessary to use WRITE_ONCE() to avoid any potential problems with store tearing.
Signed-off-by: Mel Gorman mgorman@techsingularity.net Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Reviewed-by: Valentin Schneider valentin.schneider@arm.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Mike Galbraith efault@gmx.de Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Fixes: 685207963be9 ("sched: Move h_load calculation to task_h_load()") Link: https://lkml.kernel.org/r/20190319123610.nsivgf3mjbjjesxb@techsingularity.ne... Signed-off-by: Ingo Molnar mingo@kernel.org [bwh: Backported to 3.16: use ACCESS_ONCE()] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- kernel/sched/fair.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5487,10 +5487,10 @@ static void update_cfs_rq_h_load(struct if (cfs_rq->last_h_load_update == now) return;
- cfs_rq->h_load_next = NULL; + ACCESS_ONCE(cfs_rq->h_load_next) = NULL; for_each_sched_entity(se) { cfs_rq = cfs_rq_of(se); - cfs_rq->h_load_next = se; + ACCESS_ONCE(cfs_rq->h_load_next) = se; if (cfs_rq->last_h_load_update == now) break; } @@ -5500,7 +5500,7 @@ static void update_cfs_rq_h_load(struct cfs_rq->last_h_load_update = now; }
- while ((se = cfs_rq->h_load_next) != NULL) { + while ((se = ACCESS_ONCE(cfs_rq->h_load_next)) != NULL) { load = cfs_rq->h_load; load = div64_ul(load * se->avg.load_avg_contrib, cfs_rq->runnable_load_avg + 1);