i915rcu: [6] reader sees p=0xfffff8004f309140 (stale, freed & reused)
i915rcu: [6] p->global_seqno=0x42
i915rcu: [6] chasing p->engine = 0x0000515151515151 (intel_engine_has_completed(rq->engine, seqno))
i915rcu: [7] mode 2: READING *(u32 *)(engine+0x18) -> EXPECT PANIC ON 0x0000515151515169
Fatal user address access from kernel mode from sysctl at ffffffff82624380


Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic id = 0
fault virtual address	= 0x515151515169
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff82624380
stack pointer	        = 0x10:0xfffff8011891f5b8
frame pointer	        = 0x10:0xfffff8011891f768
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 0, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 1615
current thread          = pri 6 (CRIT)
kernel: type 12 trap, code=0

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      run_replica+0x350:      movl    0x18(%r12),%esi
db>