BUG: unable to handle kernel paging request in vga16fb

BUG: unable to handle kernel paging request in vga16fb_imageblit (2)
Status: upstream: reported on 2020/11/01 15:15
Reported-by: syzbot+b6895240ddf11bc2942d@syzkaller.appspotmail.com
First crash: 127d, last: 28d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	BUG: unable to handle kernel paging request in vga16fb_imageblit	4	341d	437d	0/1	auto-closed as invalid on 2020/07/31 03:49
upstream	BUG: unable to handle kernel paging request in vga16fb_imageblit	1	439d	438d	0/21	auto-closed as invalid on 2020/04/23 17:11
upstream	BUG: unable to handle kernel paging request in vga16fb_imageblit (2)	20	58d	305d	0/21	upstream: reported on 2020/05/08 07:07
linux-4.14	BUG: unable to handle kernel paging request in vga16fb_imageblit	7	47d	327d	0/1	upstream: reported on 2020/04/16 00:46

Sample crash report:

hub 9-0:1.0: 8 ports detected
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected
BUG: unable to handle kernel paging request at ffff888001000040
PGD de01067 P4D de01067 PUD de02067 PMD 80000000010001e1 
Oops: 0003 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1 Comm: systemd Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga_imageblit_expand syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/vga16fb.c:1176 [inline]
RIP: 0010:vga16fb_imageblit+0xc2f/0x2260 syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/vga16fb.c:1260
Code: 48 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 86 0f 00 00 0f b6 45 ff <88> 02 44 89 e6 31 ff 29 de e8 83 6f c5 fd 4c 39 eb 75 b8 48 8b 7c
RSP: 0018:ffff8880b5a0f448 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888001000041 RCX: 0000000000000004
RDX: ffff888001000040 RSI: ffffffff839ceb6f RDI: ffff8880b068d2dc
RBP: ffff8880b068d2dd R08: 0000000000001964 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000001000044
R13: ffff888001000044 R14: ffff888001000040 R15: dffffc0000000000
FS:  00007f8c4a94e500(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000040 CR3: 00000000a3da6000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_putcs_unaligned syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x6e2/0xd10 syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x336/0x4f0 syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/core/fbcon.c:1269
 do_update_region+0x399/0x630 syzkaller/managers/linux-4-19/kernel/drivers/tty/vt/vt.c:683
 redraw_screen+0x5e1/0x870 syzkaller/managers/linux-4-19/kernel/drivers/tty/vt/vt.c:1031
 fbcon_blank+0xae6/0xec0 syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/core/fbcon.c:2223
 do_unblank_screen+0x241/0x610 syzkaller/managers/linux-4-19/kernel/drivers/tty/vt/vt.c:4276
 vt_ioctl+0x12c3/0x2380 syzkaller/managers/linux-4-19/kernel/drivers/tty/vt/vt_ioctl.c:498
 tty_ioctl+0x5b0/0x15c0 syzkaller/managers/linux-4-19/kernel/drivers/tty/tty_io.c:2669
 vfs_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:46 [inline]
 file_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:705
 __do_sys_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:712 [inline]
 __se_sys_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f8c48f1e017
Code: 00 00 00 48 8b 05 81 7e 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 7e 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd6af79a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 00007f8c48f1e017
RDX: 0000000000000000 RSI: 0000000000004b3a RDI: 0000000000000014
RBP: 0000000000000001 R08: 00007ffd6af79a50 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000003 R15: 000056101cece830
Modules linked in:
CR2: ffff888001000040
---[ end trace b71af61d1dbdd206 ]---
RIP: 0010:writeb syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga_imageblit_expand syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/vga16fb.c:1176 [inline]
RIP: 0010:vga16fb_imageblit+0xc2f/0x2260 syzkaller/managers/linux-4-19/kernel/drivers/video/fbdev/vga16fb.c:1260
Code: 48 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 86 0f 00 00 0f b6 45 ff <88> 02 44 89 e6 31 ff 29 de e8 83 6f c5 fd 4c 39 eb 75 b8 48 8b 7c
RSP: 0018:ffff8880b5a0f448 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888001000041 RCX: 0000000000000004
RDX: ffff888001000040 RSI: ffffffff839ceb6f RDI: ffff8880b068d2dc
RBP: ffff8880b068d2dd R08: 0000000000001964 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000001000044
R13: ffff888001000044 R14: ffff888001000040 R15: dffffc0000000000
FS:  00007f8c4a94e500(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000040 CR3: 00000000a3da6000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (6):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-linux-4-19	2021/02/08 12:41	linux-4.19.y	811218ec	2ce644fc	.config	log	report	info	BUG: unable to handle kernel paging request in vga16fb_imageblit
ci2-linux-4-19	2021/01/12 16:55	linux-4.19.y	610bdbf6	2c1f2513	.config	log	report	info
ci2-linux-4-19	2020/12/05 07:29	linux-4.19.y	daefdc9e	0ef84591	.config	log	report	info
ci2-linux-4-19	2020/11/09 08:21	linux-4.19.y	b94de4d1	cba33199	.config	log	report	info
ci2-linux-4-19	2020/11/04 23:51	linux-4.19.y	f5d8eef0	cba33199	.config	log	report	info
ci2-linux-4-19	2020/11/01 15:14	linux-4.19.y	f5d8eef0	8bc4594f	.config	log	report	info