Some warnings reported by WITNESS: witness: lock order reversal: 1st 0xffff800001332b38 &rq->lock (&rq->lock) 2nd 0xffff8000006a0050 rcs0 (&timeline->lock) lock order "&timeline->lock"(mutex) -> "&rq->lock"(mutex) first seen at: #0 witness_checkorder+0x449 #1 mtx_enter+0x34 #2 __i915_request_submit+0x5b #3 __execlists_submission_tasklet+0x1b9 #4 execlists_submit_request+0x1d1 #5 submit_notify+0x37 #6 __i915_sw_fence_complete+0x40 #7 i915_request_add+0x2d3 #8 i915_gem_init+0x2b9 #9 i915_driver_load+0x81b #10 inteldrm_attachhook+0x2c #11 config_process_deferred_mountroot+0x6b #12 main+0x755 #13 longmode_hi+0x9c lock order "&rq->lock"(mutex) -> "&timeline->lock"(mutex) first seen at: #0 witness_checkorder+0x449 #1 mtx_enter+0x34 #2 execlists_submit_request+0x2a #3 submit_notify+0x37 #4 __i915_sw_fence_complete+0x40 #5 dma_i915_sw_fence_wake+0x1d #6 notify_ring+0x1a8 #7 gen8_gt_irq_handler+0xba #8 gen8_irq_handler+0x114 #9 intr_handler+0x6e #10 Xintr_ioapic_edge16_untramp+0x19f #11 acpicpu_idle+0x1d2 #12 sched_idle+0x225 #13 proc_trampoline+0x1c
witness: lock order reversal: 1st 0xffff800001332678 &wqh->lock (&wqh->lock) 2nd 0xffff8000006a0050 rcs0 (&timeline->lock) lock order "&wqh->lock"(mutex) -> "&timeline->lock"(mutex) first seen at: #0 witness_checkorder+0x449 #1 mtx_enter+0x34 #2 execlists_submit_request+0x2a #3 submit_notify+0x37 #4 __i915_sw_fence_complete+0x40 #5 i915_sw_fence_wake+0x39 #6 __i915_sw_fence_complete+0x131 #7 dma_i915_sw_fence_wake+0x1d #8 notify_ring+0x1a8 #9 gen8_gt_irq_handler+0xba #10 gen8_irq_handler+0x114 #11 intr_handler+0x6e #12 Xintr_ioapic_edge16_untramp+0x19f #13 acpicpu_idle+0x1d2 #14 sched_idle+0x225 #15 proc_trampoline+0x1c witness: acquiring duplicate lock of same type: "&wqh->lock" 1st &wqh->lock 2nd &wqh->lock Starting stack trace... witness_checkorder(ffff800001333980,9,0) at witness_checkorder+0x6ba mtx_enter(ffff800001333970) at mtx_enter+0x34 __i915_sw_fence_complete(ffff800001333970,ffff800022280270) at __i915_sw_fence_complete+0x58 i915_sw_fence_wake(ffff8000013339c8,1,0,ffff800022280270) at i915_sw_fence_wake+0x39 __i915_sw_fence_complete(ffff800001332668,0) at __i915_sw_fence_complete+0x131 dma_i915_sw_fence_wake(ffff8000013322c8,ffff800001355b20) at dma_i915_sw_fence_wake+0x1d notify_ring(ffff800000a75000) at notify_ring+0x1a8 gen8_gt_irq_handler(ffff800000154000,2,ffff8000222803b0) at gen8_gt_irq_handler+0xba gen8_irq_handler(0,ffff800000154078) at gen8_irq_handler+0x114 intr_handler(ffff800022280450,ffff80000013fd00) at intr_handler+0x6e Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x19f acpicpu_idle() at acpicpu_idle+0x1d2 sched_idle(ffffffff81effff0) at sched_idle+0x225 end trace frame: 0x0, count: 244 End of stack trace.
