linux-kernel - Re: [BUG RT] backtrace on v5.2.9-rt3

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Message-ID: <20190913134243.3zoliue6yqfzyatl@linutronix.de>
Date:   Fri, 13 Sep 2019 15:42:43 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Sean V Kelley <sean.v.kelley@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [BUG RT] backtrace on v5.2.9-rt3

On 2019-08-30 12:01:06 [-0400], Steven Rostedt wrote:
> 
> I'm triggering the following call splat on 5.2-rt.
> 
> [   63.099414] 006: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:968
> [   63.108423] 006: in_atomic(): 0, irqs_disabled(): 1, pid: 173, name: kworker/6:1
…
> [   63.141041] 006: Call Trace:
> [   63.143916] 006:  dump_stack+0x5c/0x80
> [   63.147654] 006:  ___might_sleep.cold.92+0x8d/0x9a
> [   63.152423] 006:  rt_spin_lock+0x31/0x40
> [   63.156332] 006:  intel_engine_breadcrumbs_irq+0x56/0x320 [i915]
> [   63.162350] 006:  intel_engine_signal_breadcrumbs+0x11/0x20 [i915]
> [   63.168540] 006:  i915_hangcheck_elapsed+0x199/0x420 [i915]
…
> [   63.309375] 006:  process_one_work+0x1e8/0x4c0
…
> Attached is the config and the full dmesg.

just for book keeping: Clark reported the same thing, posted patches and
will try an alternative on Monday (as far as I'm been told). I will
continue to reply in the other thread.

Sebastian