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authorAvi Kivity <avi@redhat.com>2009-11-29 16:34:48 +0200
committerIngo Molnar <mingo@elte.hu>2009-11-29 22:03:04 +0100
commit8e7cac79808b62f242069a6ac88d364d35621371 (patch)
treeb68dacc4e080ec8c4587d783a8014906e2eb2445 /kernel/Makefile
parent3c912b6edaac56cb451e7571c95c15cbb6bd0c81 (diff)
core: Fix user return notifier on fork()
fork() clones all thread_info flags, including TIF_USER_RETURN_NOTIFY; if the new task is first scheduled on a cpu which doesn't have user return notifiers set, this causes user return notifiers to trigger without any way of clearing itself. This is easy to trigger with a forky workload on the host in parallel with kvm, resulting in a cpu in an endless loop on the verge of returning to userspace. Fix by dropping the TIF_USER_RETURN_NOTIFY immediately after fork. Signed-off-by: Avi Kivity <avi@redhat.com> LKML-Reference: <1259505288-16559-1-git-send-email-avi@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/Makefile')
0 files changed, 0 insertions, 0 deletions