[Bug 111159] [CI][DRMTIP] igt at gem_exec_balancer@nop - dmesg-warn - list_del corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111159

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 7d6b60dbc6a015dbdc444e4d39549600f7156690 (HEAD -> drm-intel-next-queued,
drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Jul 16 13:49:30 2019 +0100

    drm/i915/execlists: Cancel breadcrumb on preempting the virtual engine

    As we unwind the requests for a preemption event, we return a virtual
    request back to its original virtual engine (so that it is available for
    execution on any of its siblings). In the process, this means that its
    breadcrumb should no longer be associated with the original physical
    engine, and so we are forced to decouple it. Previously, as the request
    could not complete without our awareness, we would move it to the next
    real engine without any danger. However, preempt-to-busy allowed for
    requests to continue on the HW and complete in the background as we
    unwound, which meant that we could end up retiring the request before
    fixing up the breadcrumb link.

    [51679.517943] INFO: trying to register non-static key.
    [51679.517956] the code is fine but needs lockdep annotation.
    [51679.517960] turning off the locking correctness validator.
    [51679.517966] CPU: 0 PID: 3270 Comm: kworker/u8:0 Tainted: G     U        
   5.2.0+ #717
    [51679.517971] Hardware name: Intel Corporation NUC7i5BNK/NUC7i5BNB, BIOS
BNKBL357.86A.0052.2017.0918.1346 09/18/2017
    [51679.518012] Workqueue: i915 retire_work_handler [i915]
    [51679.518017] Call Trace:
    [51679.518026]  dump_stack+0x67/0x90
    [51679.518031]  register_lock_class+0x52c/0x540
    [51679.518038]  ? find_held_lock+0x2d/0x90
    [51679.518042]  __lock_acquire+0x68/0x1800
    [51679.518047]  ? find_held_lock+0x2d/0x90
    [51679.518073]  ? __i915_sw_fence_complete+0xff/0x1c0 [i915]
    [51679.518079]  lock_acquire+0x90/0x170
    [51679.518105]  ? i915_request_cancel_breadcrumb+0x29/0x160 [i915]
    [51679.518112]  _raw_spin_lock+0x27/0x40
    [51679.518138]  ? i915_request_cancel_breadcrumb+0x29/0x160 [i915]
    [51679.518165]  i915_request_cancel_breadcrumb+0x29/0x160 [i915]
    [51679.518199]  i915_request_retire+0x43f/0x530 [i915]
    [51679.518232]  retire_requests+0x4d/0x60 [i915]
    [51679.518263]  i915_retire_requests+0xdf/0x1f0 [i915]
    [51679.518294]  retire_work_handler+0x4c/0x60 [i915]
    [51679.518301]  process_one_work+0x22c/0x5c0
    [51679.518307]  worker_thread+0x37/0x390
    [51679.518311]  ? process_one_work+0x5c0/0x5c0
    [51679.518316]  kthread+0x116/0x130
    [51679.518320]  ? kthread_create_on_node+0x40/0x40
    [51679.518325]  ret_from_fork+0x24/0x30
    [51679.520177] ------------[ cut here ]------------
    [51679.520189] list_del corruption, ffff88883675e2f0->next is LIST_POISON1
(dead000000000100)

    Fixes: 22b7a426bbe1 ("drm/i915/execlists: Preempt-to-busy")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-4-chris@chris-wilson.co.uk

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