BUG: unable to handle kernel paging request in drm_fb_helper_dirty

BUG: unable to handle kernel paging request in drm_fb_helper_dirty_work
Status: upstream: reported C repro on 2019/12/09 11:16
Reported-by: syzbot+8a2039467425e497e64a@syzkaller.appspotmail.com
First crash: 501d, last: 142d

Sample crash report:

BUG: unable to handle page fault for address: fffff520016dec00
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7ffcd067 P4D 7ffcd067 PUD 2c920067 PMD 28203067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1221 Comm: kworker/1:2 Not tainted 5.7.0-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:memory_is_nonzero mm/kasan/generic.c:120 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline]
RIP: 0010:check_memory_region+0x9d/0x190 mm/kasan/generic.c:192
Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 03 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 b2 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 69 80
RSP: 0018:ffffc90003f47c20 EFLAGS: 00010216
RAX: fffff520016dec00 RBX: fffff520016dec00 RCX: ffffffff840645bd
RDX: 0000000000000001 RSI: 0000000000001000 RDI: ffffc9000b6f6000
RBP: fffff520016dee00 R08: fffff520016dee00 R09: 0000000000000200
R10: ffffc9000b6f6fff R11: fffff520016dedff R12: 0000000000001000
R13: ffffc9000b6f6000 R14: ffffc90009b47000 R15: ffff888078c65a00
FS:  0000000000000000(0000) GS:ffff88802cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff520016dec00 CR3: 00000000214d1000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 memcpy+0x39/0x60 mm/kasan/common.c:106
 memcpy include/linux/string.h:406 [inline]
 drm_fb_helper_dirty_blit_real drivers/gpu/drm/drm_fb_helper.c:386 [inline]
 drm_fb_helper_dirty_work+0x42d/0x760 drivers/gpu/drm/drm_fb_helper.c:415
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Modules linked in:
CR2: fffff520016dec00
---[ end trace fdb627f1507ae2fd ]---
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:120 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline]
RIP: 0010:check_memory_region+0x9d/0x190 mm/kasan/generic.c:192
Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 03 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 b2 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 69 80
RSP: 0018:ffffc90003f47c20 EFLAGS: 00010216
RAX: fffff520016dec00 RBX: fffff520016dec00 RCX: ffffffff840645bd
RDX: 0000000000000001 RSI: 0000000000001000 RDI: ffffc9000b6f6000
RBP: fffff520016dee00 R08: fffff520016dee00 R09: 0000000000000200
R10: ffffc9000b6f6fff R11: fffff520016dedff R12: 0000000000001000
R13: ffffc9000b6f6000 R14: ffffc90009b47000 R15: ffff888078c65a00
FS:  0000000000000000(0000) GS:ffff88802cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff520016dec00 CR3: 00000000214d1000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (15):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info
ci-qemu-upstream-386	2020/06/18 08:37	upstream	435faf5c	d45a4d69	.config	log	report	syz	C
ci-qemu-upstream	2020/12/01 11:20	upstream	b6505459	07bfe8a5	.config	log	report			info
ci-qemu-upstream	2020/10/22 00:27	upstream	f804b315	be6b1582	.config	log	report			info
ci-qemu-upstream	2020/07/22 11:05	upstream	4fa640dc	128cd85f	.config	log	report
ci-qemu-upstream	2020/01/13 08:10	upstream	b3a987b0	99565c1a	.config	log	report
ci-qemu-upstream-386	2020/10/11 21:25	upstream	3dd0130f	4a77ae0b	.config	log	report			info
ci-qemu-upstream-386	2020/10/03 22:31	upstream	22fbc037	ca27b3bc	.config	log	report			info
ci-qemu-upstream-386	2020/08/19 15:40	upstream	00e4db51	a7d4a4f9	.config	log	report
ci-qemu-upstream-386	2020/03/21 17:40	upstream	c63c50fc	aa6c6a55	.config	log	report
ci-qemu-upstream-386	2020/03/04 11:32	upstream	8b614cb8	712198ac	.config	log	report
ci-qemu-upstream-386	2020/01/31 18:58	upstream	6ba3d706	c30117b2	.config	log	report
ci-qemu-upstream-386	2020/01/06 22:06	upstream	ec7b3f53	53430d97	.config	log	report
ci-qemu-upstream-386	2019/12/22 06:22	upstream	b8e382a1	bc586918	.config	log	report
ci-qemu-upstream-386	2019/12/18 10:49	upstream	2187f215	1b49002e	.config	log	report
ci-qemu-upstream-386	2019/12/09 07:35	upstream	e42617b8	1508f453	.config	log	report