cpu1: Ratio of byte access time to unaligned word access is 7.73, unaligned accesses are fast
WARNING: [] drivers/gpu/drm/drm_vblank.c:1318 at drm_wait_one_vblank+0x362/0x610 drivers/gpu/drm/drm_vblank.c:1318, CPU#1: kworker/1:2/805
Modules linked in:
CPU: 1 UID: 0 PID: 805 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: events drm_fb_helper_damage_work
epc : drm_wait_one_vblank+0x362/0x610 drivers/gpu/drm/drm_vblank.c:1318
 ra : drm_wait_one_vblank+0x362/0x610 drivers/gpu/drm/drm_vblank.c:1318
epc : ffffffff820f94b2 ra : ffffffff820f94b2 sp : ffff8f8001a977c0
 gp : ffffffff89f9df20 tp : ffffaf801a820000 t0 : ffff8f8001a97374
 t1 : fffffffef13f44c8 t2 : 766972645f787561 s0 : ffff8f8001a978d0
 s1 : ffffaf801a77e000 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000000002 a3 : ffffffff80146d20 a4 : 0000000000000000
 a5 : 0000000000000000 a6 : 0000000000000003 a7 : 0000000000000003
 s2 : ffffaf801a54f000 s3 : 0000000000000000 s4 : ffffffff86f69a20
 s5 : 1ffff1f000352efc s6 : ffffffff86e4f900 s7 : ffff8f8001a97810
 s8 : ffffaf801a750848 s9 : 0000000000000000 s10: 1ffffffff1415560
 s11: ffffaf801a751988 t3 : ffffffff87d9cae8 t4 : fffffffef13f44c8
 t5 : fffffffef13f44c9 t6 : ffff8f8001a97158 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff820f94b2 cause: 0000000000000003
[<ffffffff820f94b2>] drm_wait_one_vblank+0x362/0x610 drivers/gpu/drm/drm_vblank.c:1318
[<ffffffff820f97b6>] drm_crtc_wait_one_vblank+0x56/0x78 drivers/gpu/drm/drm_vblank.c:1334
[<ffffffff82104ea0>] drm_client_modeset_wait_for_vblank+0xe8/0x114 drivers/gpu/drm/drm_client_modeset.c:1330
[<ffffffff8216c082>] drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:334 [inline]
[<ffffffff8216c082>] drm_fb_helper_damage_work+0x14a/0x674 drivers/gpu/drm/drm_fb_helper.c:372
[<ffffffff801c25d4>] process_one_work+0x930/0x1e14 kernel/workqueue.c:3257
[<ffffffff801c3ff8>] process_scheduled_works kernel/workqueue.c:3340 [inline]
[<ffffffff801c3ff8>] worker_thread+0x540/0xcbc kernel/workqueue.c:3421
[<ffffffff801e2fcc>] kthread+0x37c/0x778 kernel/kthread.c:463
[<ffffffff80069946>] ret_from_fork_kernel+0x2a/0xbbc arch/riscv/kernel/process.c:228
[<ffffffff863bb74e>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:363