general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 8151 Comm: syz-executor.2 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__switch_to_asm+0x0/0x40 arch/x86/entry/entry_64.S:228
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900171f6de8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae635e18 RCX: 0000000000000000
RDX: 1ffff11015cc6bc2 RSI: ffff888094b4a400 RDI: ffff888056d9a040
RBP: ffffc900171f6eb8 R08: 0000000000000001 R09: ffff888056d9a908
R10: fffffbfff155c591 R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff888056d9a040 R14: ffff888094b4a400 R15: ffff888056d9a470
FS:  0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000f5d41b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000564cd9468498 CR3: 00000000a0785000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 context_switch kernel/sched/core.c:3430 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4155
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4413
 idtentry_exit_cond_resched arch/x86/entry/common.c:621 [inline]
 idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:668
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: 48 89 ef 5d e9 01 07 3f 00 5d be 03 00 00 00 e9 26 aa 23 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 48 8b 14 25 00 ff 01 00 65 8b 05 c0 ad 8e 7e a9 00 01 ff 00 48
RSP: 0018:ffffc900171f6fb0 EFLAGS: 00000216
RAX: 0000000000000002 RBX: 0000000000000050 RCX: ffffffff83c5d814
RDX: 0000000000000005 RSI: ffff888056d9a040 RDI: 0000000000000004
RBP: 0000000000000005 R08: 0000000000000001 R09: ffff8880a353249f
R10: 0000000000000050 R11: 0000000000000000 R12: ffff8880010095cd
R13: ffff8880010095c8 R14: 0000000000000000 R15: 00000000fffb117b
 writeb arch/x86/include/asm/io.h:65 [inline]
 vga16fb_fillrect+0x9c0/0x193b drivers/video/fbdev/vga16fb.c:923
 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_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
 fbcon_switch+0x52c/0x16c0 drivers/video/fbdev/core/fbcon.c:2296
 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015
 fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
 fb_compat_ioctl+0x175/0xc10 drivers/video/fbdev/core/fbmem.c:1315
 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:847
 do_syscall_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:403
 __do_fast_syscall_32 arch/x86/entry/common.c:448 [inline]
 do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:474
 entry_SYSENTER_compat+0x6d/0x7c arch/x86/entry/entry_64_compat.S:138
RIP: 0023:0xf7f46569
Code: Bad RIP value.
RSP: 002b:00000000f5d410cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000004601
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 370151408a400f25 ]---
RIP: 0010:__switch_to_asm+0x0/0x40 arch/x86/entry/entry_64.S:228
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900171f6de8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae635e18 RCX: 0000000000000000
RDX: 1ffff11015cc6bc2 RSI: ffff888094b4a400 RDI: ffff888056d9a040
RBP: ffffc900171f6eb8 R08: 0000000000000001 R09: ffff888056d9a908
R10: fffffbfff155c591 R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff888056d9a040 R14: ffff888094b4a400 R15: ffff888056d9a470
FS:  0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000f5d41b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000564cd9468498 CR3: 00000000a0785000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400