Re: Dovetail 6.15: x86: Invalid wait context

[Philippe Gerum <rpm@xenomai.org>]

Florian Bezdeka <florian.bezdeka@siemens.com> writes:

> Hi Philippe,
>
> the following is taken from our CI, testing Dovetail 6.15.
> On x86 we have an invalid wait context reported:
>
> [  151.574032] 
> [  151.574039] =============================
> [  151.574043] [ BUG: Invalid wait context ]
> [  151.574046] 6.15.0 #1 Not tainted
> [  151.574048] -----------------------------
> [  151.574048] swapper/0/0 is trying to lock:
> [  151.574050] ffffffff841174c0 (&state->readq){....}-{3:3}, at: __wake_up+0x21/0x60
> [  151.574063] other info that might help us debug this:
> [  151.574064] context-{2:2}
> [  151.574065] no locks held by swapper/0/0.
> [  151.574066] stack backtrace:
> [  151.574073] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0 #1 PREEMPT(full) 
> [  151.574078] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> [  151.574079] IRQ stage: Linux
> [  151.574083] Call Trace:
> [  151.574086]  <IRQ>
> [  151.574088]  dump_stack_lvl+0x79/0xe0
> [  151.574095]  __lock_acquire+0x942/0xbf0
> [  151.574104]  lock_acquire+0xe2/0x2f0
> [  151.574107]  ? __wake_up+0x21/0x60
> [  151.574111]  ? find_held_lock+0x2b/0x80
> [  151.574115]  _raw_spin_lock_irqsave+0x49/0x60
> [  151.574120]  ? __wake_up+0x21/0x60
> [  151.574122]  __wake_up+0x21/0x60
> [  151.574125]  xnpipe_wakeup_proc+0x152/0x590
> [  151.574132]  handle_synthetic_irq+0xc2/0x250
> [  151.574137]  arch_do_IRQ_pipelined+0xca/0x180
> [  151.574141]  </IRQ>
> [  151.574142]  <TASK>
> [  151.574144]  sync_current_irq_stage+0xaa/0x110
> [  151.574147]  inband_irq_enable+0x42/0x60
> [  151.574151]  cpuidle_idle_call+0x17d/0x200
> [  151.574155]  do_idle+0x89/0xd0
> [  151.574158]  cpu_startup_entry+0x29/0x30
> [  151.574160]  rest_init+0xf0/0x190
> [  151.574164]  start_kernel+0x632/0x700
> [  151.574179]  x86_64_start_reservations+0x18/0x30
> [  151.574185]  x86_64_start_kernel+0x78/0x80
> [  151.574188]  common_startup_64+0x13e/0x148
> [  151.574198]  </TASK>
>
> That seems to be triggered by the Xenomai 3 smokey testsuite.
>
> Any ideas?

Does this happen when full preemption is disabled on x86?

-- 
Philippe.