few tests - abort - rcu: INFO: rcu_preempt detected stalls on CPUs/tasks

http://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1625236203?query_key=536fb3e23e3ffae131aa897e16a0eca4edf0b8c4

<7> [247.730420] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling PW_1
<7> [247.730651] i915 0000:00:02.0: [drm:bxt_enable_dc9 [i915]] Enabling DC9
<7> [247.730788] i915 0000:00:02.0: [drm:gen9_set_dc_state.part.0 [i915]] Setting DC state from 00 to 08
<7> [247.730970] i915 0000:00:02.0: [drm:intel_runtime_suspend [i915]] Device suspended
<3> [254.447041] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
<3> [254.447085] rcu: 	Tasks blocked on level-1 rcu_node (CPUs 10-19): P1585
<3> [254.447349] rcu: 	(detected by 15, t=65002 jiffies, g=69865, q=1026 ncpus=20)
<6> [254.447367] task:gem_busy        state:R  running task     stack:13832 pid:1585  tgid:1585  ppid:1582   flags:0x00004002
<6> [254.447376] Call Trace:
<6> [254.447377]  <TASK>
<6> [254.447381]  ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
<6> [254.447389]  ? lockdep_hardirqs_on+0xc3/0x140
<6> [254.447395]  ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
<6> [254.447397]  ? lockdep_hardirqs_on+0xc3/0x140
<6> [254.447399]  ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
<6> [254.447409]  ? dma_resv_iter_walk_unlocked.part.0+0x5b/0x1e0
<6> [254.447415]  ? __pfx_i915_gem_busy_ioctl+0x10/0x10 [i915]
<6> [254.447561]  ? dma_resv_iter_first_unlocked+0x91/0x230
<6> [254.447564]  ? i915_gem_busy_ioctl+0xba/0xb80 [i915]
<6> [254.447678]  ? find_held_lock+0x2b/0x80
<6> [254.447686]  ? __pfx_i915_gem_busy_ioctl+0x10/0x10 [i915]