deadlock in active_purge() vs msm_job_run()

[ 7372.794761] task:kswapd0         state:D stack:    0 pid:  161 ppid:     2 flags:0x00000008
[ 7372.794793] Call trace:
[ 7372.794801]  __switch_to+0xbc/0x12c
[ 7372.794817]  __schedule+0x4b0/0x718
[ 7372.794825]  schedule+0xa8/0xf8
[ 7372.794833]  schedule_timeout+0x90/0xf4
[ 7372.794841]  dma_fence_default_wait+0x108/0x1ec
[ 7372.794855]  dma_fence_wait_timeout+0x54/0x1a0
[ 7372.794864]  dma_resv_wait_timeout+0x60/0x138
[ 7372.794872]  active_purge+0x30/0x5c
[ 7372.794884]  drm_gem_lru_scan+0x110/0x268
[ 7372.794898]  msm_gem_shrinker_scan+0x160/0x250
[ 7372.794908]  do_shrink_slab+0x1a8/0x354
[ 7372.794917]  shrink_slab+0x94/0x11c
[ 7372.794926]  shrink_node+0x5c8/0x8ac
[ 7372.794935]  balance_pgdat+0x310/0x570
[ 7372.794944]  kswapd+0xfc/0x1e4
[ 7372.794952]  kthread+0x134/0x300
[ 7372.794963]  ret_from_fork+0x10/0x20

vs.

[ 7372.795217] task:ring0           state:D stack:    0 pid:  254 ppid:     2 flags:0x00000008
[ 7372.795228] Call trace:
[ 7372.795234]  __switch_to+0xbc/0x12c
[ 7372.795244]  __schedule+0x4b0/0x718
[ 7372.795252]  schedule+0xa8/0xf8
[ 7372.795261]  schedule_preempt_disabled+0x2c/0x48
[ 7372.795269]  __ww_mutex_lock+0x474/0x8b0
[ 7372.795278]  __ww_mutex_lock_slowpath+0x20/0x2c
[ 7372.795286]  ww_mutex_lock+0x54/0xc0
[ 7372.795294]  msm_job_run+0x60/0x114
[ 7372.795304]  drm_sched_main+0x170/0x434
[ 7372.795316]  kthread+0x134/0x300
[ 7372.795325]  ret_from_fork+0x10/0x20