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    SubjectRe: sched: spinlock recursion in sched_rr_get_interval
    On Sun, Jul 06, 2014 at 01:27:37PM -0400, Sasha Levin wrote:
    > Hi all,
    >
    > While fuzzing with trinity inside a KVM tools guest running the latest -next
    > kernel I've stumbled on the following spew:
    >
    > [10062.200152] BUG: spinlock recursion on CPU#11, trinity-c194/2414
    > [10062.201897] lock: 0xffff88010cfd7740, .magic: dead4ead, .owner: trinity-c194/2414, .owner_cpu: -1
    > [10062.204432] CPU: 11 PID: 2414 Comm: trinity-c194 Not tainted 3.16.0-rc3-next-20140703-sasha-00024-g2ad7668-dirty #763
    > [10062.207517] ffff88010cfd7740 ffff8803a429fe48 ffffffffaa4897e4 0000000000000000
    > [10062.209810] ffff8803c35f0000 ffff8803a429fe68 ffffffffaa47df58 ffff88010cfd7740
    > [10062.210024] ffffffffab845c77 ffff8803a429fe88 ffffffffaa47df83 ffff88010cfd7740
    > [10062.210024] Call Trace:
    > [10062.210024] dump_stack (lib/dump_stack.c:52)
    > [10062.210024] spin_dump (kernel/locking/spinlock_debug.c:68 (discriminator 6))
    > [10062.210024] spin_bug (kernel/locking/spinlock_debug.c:76)
    > [10062.210024] do_raw_spin_lock (kernel/locking/spinlock_debug.c:84 kernel/locking/spinlock_debug.c:135)
    > [10062.210024] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
    > [10062.210024] ? task_rq_lock (include/linux/sched.h:2885 kernel/sched/core.c:348)
    > [10062.210024] task_rq_lock (include/linux/sched.h:2885 kernel/sched/core.c:348)
    > [10062.210024] SyS_sched_rr_get_interval (kernel/sched/core.c:4429 kernel/sched/core.c:4407)
    > [10062.210024] ? tracesys (arch/x86/kernel/entry_64.S:531)
    > [10062.210024] tracesys (arch/x86/kernel/entry_64.S:542)

    Cute, but I'm utterly failing to see how that happened :/

    All we should be holding there is the rcu_read_lock(), task_rq_lock()
    there will take ->pi_lock and then rq->lock.

    Maybe after more tea, when the brain wakes up more or so.. weird.
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