Commit 30b4e9eb authored May 09, 2012 by Igor Mammedov Committed by Ingo Molnar May 09, 2012

sched: Fix KVM and ia64 boot crash due to sched_groups circular linked list assumption



If we have one cpu that failed to boot and boot cpu gave up on
waiting for it and then another cpu is being booted, kernel
might crash with following OOPS:

   BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
   IP: [<ffffffff812c3630>] __bitmap_weight+0x30/0x80
   Call Trace:
       [<ffffffff8108b9b6>] build_sched_domains+0x7b6/0xa50

The crash happens in init_sched_groups_power() that expects
sched_groups to be circular linked list. However it is not
always true, since sched_groups preallocated in __sdt_alloc are
initialized in build_sched_groups and it may exit early

        if (cpu != cpumask_first(sched_domain_span(sd)))
                return 0;

without initializing sd->groups->next field.

Fix bug by initializing next field right after sched_group was
allocated.

Also-Reported-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Cc: a.p.zijlstra@chello.nl
Cc: pjt@google.com
Cc: seto.hidetoshi@jp.fujitsu.com
Link: http://lkml.kernel.org/r/1336559908-32533-1-git-send-email-imammedo@redhat.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent febb72a6

kernel/sched/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -6382,6 +6382,8 @@ static int __sdt_alloc(const struct cpumask *cpu_map)
		if (!sg)
		return -ENOMEM;

		sg->next = sg;

		*per_cpu_ptr(sdd->sg, j) = sg;

		sgp = kzalloc_node(sizeof(struct sched_group_power),

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