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authorMichael S. Tsirkin <mst@redhat.com>2015-03-10 11:55:08 +1030
committerRusty Russell <rusty@rustcorp.com.au>2015-03-10 11:56:15 +1030
commit3d2a3774c1b046f548ebea0391a602fd5685a307 (patch)
treeb664aba0a08380007cb1ae1b53a743c65957c6bc /net/9p
parent0fa2a56437d0b7ef5d86eef2778ad3469ca72d5a (diff)
virtio-balloon: do not call blocking ops when !TASK_RUNNING
virtio balloon has this code: wait_event_interruptible(vb->config_change, (diff = towards_target(vb)) != 0 || vb->need_stats_update || kthread_should_stop() || freezing(current)); Which is a problem because towards_target() call might block after wait_event_interruptible sets task state to TAST_INTERRUPTIBLE, causing the task_struct::state collision typical of nesting of sleeping primitives See also http://lwn.net/Articles/628628/ or Thomas's bug report http://article.gmane.org/gmane.linux.kernel.virtualization/24846 for a fuller explanation. To fix, rewrite using wait_woken. Cc: stable@vger.kernel.org Reported-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'net/9p')
0 files changed, 0 insertions, 0 deletions