On Thu, Feb 19, 2015 at 11:54:40AM -0500, Vince Weaver wrote:
> [ 7938.802139] [<ffffffff8115e114>] perf_tp_event+0xc4/0x210
> [ 7938.861174] [<ffffffff810b4f8a>] perf_trace_lock+0x12a/0x160
> [ 7938.882197] [<ffffffff810b7f10>] lock_release+0x130/0x260
> [ 7938.888754] [<ffffffff816c7474>] _raw_spin_unlock_irqrestore+0x24/0x40
> [ 7938.896510] [<ffffffff8107bb4d>] do_send_sig_info+0x5d/0x80
> [ 7938.903240] [<ffffffff811f69df>] send_sigio_to_task+0x12f/0x1a0
> [ 7938.923894] [<ffffffff811f71ce>] send_sigio+0xae/0x100
> [ 7938.930132] [<ffffffff811f72b7>] kill_fasync+0x97/0xf0
> [ 7938.942707] [<ffffffff8115d0b4>] perf_event_wakeup+0xd4/0xf0
> [ 7938.956367] [<ffffffff8115d103>] perf_pending_event+0x33/0x60
> [ 7938.963199] [<ffffffff8114e3fc>] irq_work_run_list+0x4c/0x80
> [ 7938.969932] [<ffffffff8114e448>] irq_work_run+0x18/0x40
> [ 7938.976212] [<ffffffff810196af>] smp_trace_irq_work_interrupt+0x3f/0xc0
> [ 7938.983957] [<ffffffff816c99bd>] trace_irq_work_interrupt+0x6d/0x80
Ah, it looks like the never ending irq_work..
Could you try this?
---
kernel/events/core.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f04daabfd1cf..088e81ae43cb 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4574,6 +4574,13 @@ static void perf_pending_event(struct irq_work *entry)
{
struct perf_event *event = container_of(entry,
struct perf_event, pending);
+ int rctx;
+
+ rctx = perf_swevent_get_recursion_context();
+ /*
+ * If we 'fail' here, that's OK, it means recursion is already disabled
+ * and we won't recurse 'further'.
+ */
if (event->pending_disable) {
event->pending_disable = 0;
@@ -4584,6 +4591,9 @@ static void perf_pending_event(struct irq_work *entry)
event->pending_wakeup = 0;
perf_event_wakeup(event);
}
+
+ if (rctx >= 0)
+ perf_swevent_put_recursion_context(rctx);
}
/*
--
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