BUG: unable to handle page fault for address: ffffffffffffff6c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 9a7c067 P4D 9a7c067 PUD 9a7e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7151 Comm: syz-executor.3 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 07 ed 2d 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 1d 00 00 <45> 8b a6 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 53 e9 2d 00 41 83
RSP: 0018:ffffc90004c87b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff81460b06
RDX: 0000000000000000 RSI: ffffffff8145ccf9 RDI: ffffc90004c87d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90004c87d18
R13: ffff8880595823c0 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  000000000103d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 0000000059584000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x36a/0x9e0 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x415ffa
Code: Bad RIP value.
RSP: 002b:00007ffdb8eb8908 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000000037a847 RCX: 0000000000415ffa
RDX: 0000000040000001 RSI: 00007ffdb8eb8940 RDI: ffffffffffffffff
RBP: 00000000000023b2 R08: 0000000000000001 R09: 000000000103d940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00007ffdb8eb8940 R14: 000000000037a7ac R15: 00007ffdb8eb8950
Modules linked in:
CR2: ffffffffffffff6c
BUG: unable to handle page fault for address: ffff888000ebc000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD d601067 P4D d601067 PUD d602067 PMD ebb063 PTE 0
Oops: 0002 [#2] PREEMPT SMP KASAN
CPU: 0 PID: 7151 Comm: syz-executor.3 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x9c0/0x193b drivers/video/fbdev/vga16fb.c:923
Code: ad fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 67 52 ad fd 31 ff 89 de 31 ed e8 dc 4e ad fd 85 db 4d 89 ec 74 22 e8 50 52 ad fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 3c 4e ad fd 39 eb
RSP: 0018:ffffc90004c87310 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 00000000000000a0 RCX: ffffffff83c667c4
RDX: ffff8880595823c0 RSI: ffffffff83c667b0 RDI: 0000000000000004
RBP: 0000000000000020 R08: 0000000000000001 R09: ffff888218fe5bdf
R10: 00000000000000a0 R11: 0000000000000000 R12: ffff888000ebc000
R13: ffff888000ebbfe0 R14: 0000000000000000 R15: 00000000fffe96cc
FS:  000000000103d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888000ebc000 CR3: 0000000059584000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
 fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381
 fbcon_switch+0xb6e/0x16c0 drivers/video/fbdev/core/fbcon.c:2363
 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015
 fbcon_blank+0x8b1/0xbf0 drivers/video/fbdev/core/fbcon.c:2424
 do_unblank_screen+0x248/0x430 drivers/tty/vt/vt.c:4310
 bust_spinlocks+0x5b/0xe0 lib/bust_spinlocks.c:26
 oops_end+0x2b/0xf0 arch/x86/kernel/dumpstack.c:337
 no_context+0x5a2/0x9f0 arch/x86/mm/fault.c:701
 __bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
 do_kern_addr_fault+0x5b/0x6f arch/x86/mm/fault.c:1130
 handle_page_fault arch/x86/mm/fault.c:1363 [inline]
 exc_page_fault+0x14c/0x170 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:544
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 07 ed 2d 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 1d 00 00 <45> 8b a6 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 53 e9 2d 00 41 83
RSP: 0018:ffffc90004c87b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff81460b06
RDX: 0000000000000000 RSI: ffffffff8145ccf9 RDI: ffffc90004c87d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90004c87d18
R13: ffff8880595823c0 R14: fffffffffffffaf8 R15: ffffffffffffff6c
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x36a/0x9e0 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x415ffa
Code: Bad RIP value.
RSP: 002b:00007ffdb8eb8908 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000000037a847 RCX: 0000000000415ffa
RDX: 0000000040000001 RSI: 00007ffdb8eb8940 RDI: ffffffffffffffff
RBP: 00000000000023b2 R08: 0000000000000001 R09: 000000000103d940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00007ffdb8eb8940 R14: 000000000037a7ac R15: 00007ffdb8eb8950
Modules linked in:
CR2: ffff888000ebc000
---[ end trace 199fafad34a85c85 ]---
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 07 ed 2d 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 1d 00 00 <45> 8b a6 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 53 e9 2d 00 41 83
RSP: 0018:ffffc90004c87b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff81460b06
RDX: 0000000000000000 RSI: ffffffff8145ccf9 RDI: ffffc90004c87d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90004c87d18
R13: ffff8880595823c0 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  000000000103d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888000ebc000 CR3: 0000000059584000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400