syzbot


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: 898d, last: 540d

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 Title
ci-qemu-upstream-386 2020/06/18 08:37 upstream 435faf5c218a d45a4d69 .config log report syz C
ci-qemu-upstream 2020/12/01 11:20 upstream b65054597872 07bfe8a5 .config log report info
ci-qemu-upstream 2020/10/22 00:27 upstream f804b3159482 be6b1582 .config log report info
ci-qemu-upstream 2020/07/22 11:05 upstream 4fa640dc5230 128cd85f .config log report
ci-qemu-upstream 2020/01/13 08:10 upstream b3a987b0264d 99565c1a .config log report
ci-qemu-upstream-386 2020/10/11 21:25 upstream 3dd0130f2430 4a77ae0b .config log report info
ci-qemu-upstream-386 2020/10/03 22:31 upstream 22fbc037cd32 ca27b3bc .config log report info
ci-qemu-upstream-386 2020/08/19 15:40 upstream 00e4db51259a a7d4a4f9 .config log report
ci-qemu-upstream-386 2020/03/21 17:40 upstream c63c50fc2ec9 aa6c6a55 .config log report
ci-qemu-upstream-386 2020/03/04 11:32 upstream 8b614cb8f1dc 712198ac .config log report
ci-qemu-upstream-386 2020/01/31 18:58 upstream 6ba3d7066c71 c30117b2 .config log report
ci-qemu-upstream-386 2020/01/06 22:06 upstream ec7b3f5372e2 53430d97 .config log report
ci-qemu-upstream-386 2019/12/22 06:22 upstream b8e382a185eb bc586918 .config log report
ci-qemu-upstream-386 2019/12/18 10:49 upstream 2187f215ebaa 1b49002e .config log report
ci-qemu-upstream-386 2019/12/09 07:35 upstream e42617b825f8 1508f453 .config log report