BUG: unable to handle page fault for address: ffffc9000ade0000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 2c800067 P4D 2c800067 PUD 2c975067 PMD 28187067 PTE 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 3 PID: 10979 Comm: kworker/3:6 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events drm_fb_helper_dirty_work
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 9f fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 64 47 9f fd 4d 85 ed 75 2e e8 da 4a 9f fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc90004897c10 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000ade0000 RCX: 0000000000000008
RDX: ffff888050188180 RSI: ffffc9000a5e1000 RDI: ffffc9000ade0000
RBP: 0000000000000020 R08: 1ffff11004f7eea3 R09: ffff888076791147
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000a5e1000
R13: 0000000000000000 R14: ffffc9000a5e1000 R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff88802d100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000ade0000 CR3: 000000004f263000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 drm_fb_helper_dirty_blit_real drivers/gpu/drm/drm_fb_helper.c:405 [inline]
 drm_fb_helper_dirty_work+0x4e4/0x810 drivers/gpu/drm/drm_fb_helper.c:435
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
CR2: ffffc9000ade0000
---[ end trace bbaa0e3e83abebb3 ]---
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 9f fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 64 47 9f fd 4d 85 ed 75 2e e8 da 4a 9f fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc90004897c10 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000ade0000 RCX: 0000000000000008
RDX: ffff888050188180 RSI: ffffc9000a5e1000 RDI: ffffc9000ade0000
RBP: 0000000000000020 R08: 1ffff11004f7eea3 R09: ffff888076791147
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000a5e1000
R13: 0000000000000000 R14: ffffc9000a5e1000 R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff88802d100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000ade0000 CR3: 000000004f263000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400