BUG: kernel NULL pointer dereference, address: 0000000000000007 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 217c94067 P4D 217c94067 PUD 21a839067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 31133 Comm: syz-executor.3 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:update_pvclock_gtod arch/x86/kvm/x86.c:1749 [inline] RIP: 0010:pvclock_gtod_notify+0x193/0x570 arch/x86/kvm/x86.c:7452 Code: 43 18 48 8d 7b 1c 48 89 fa 48 c1 ea 03 89 05 6c ea de 0a 48 b8 00 00 00 00 00 fc ff df 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 <38> 00 70 07 00 d2 0f 85 2b 03 00 00 8b 43 1c 48 8d 7b 20 48 89 fa RSP: 0018:ffffc90000da8be8 EFLAGS: 00010002 RAX: 0000000000000007 RBX: ffffffff8c970980 RCX: ffffffff815a14fb RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8c97099c RBP: ffffffff89b35260 R08: 0000000000000000 R09: ffffffff8c5f0a1f R10: fffffbfff18be143 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89ae9320 FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5516b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000007 CR3: 0000000202954000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 update_pvclock_gtod kernel/time/timekeeping.c:581 [inline] timekeeping_update+0x28a/0x4a0 kernel/time/timekeeping.c:675 timekeeping_advance+0x6ad/0xa40 kernel/time/timekeeping.c:2122 tick_do_update_jiffies64.part.0+0x1ec/0x330 kernel/time/tick-sched.c:101 tick_do_update_jiffies64 kernel/time/tick-sched.c:64 [inline] tick_sched_do_timer kernel/time/tick-sched.c:147 [inline] tick_sched_timer+0x236/0x2a0 kernel/time/tick-sched.c:1321 __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197 Code: fe 01 00 65 8b 05 60 bf 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 24 14 00 00 85 c0 74 2b 8b 82 00 14 00 00 <83> f8 02 75 20 48 8b 8a 08 14 00 00 8b 92 04 14 00 00 48 8b 01 48 RSP: 0018:ffffc90016666fe8 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000007 RCX: ffffffff83c66546 RDX: ffff888092a380c0 RSI: ffffffff83c66556 RDI: 0000000000000005 RBP: 0000000000000001 R08: ffff8880a2cd8f2f R09: ffff8880a645515f R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000018 R13: 0000000000000001 R14: ffff8880a2cd8f27 R15: 000000000000001c slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:174 [inline] cfb_imageblit+0x846/0x1010 drivers/video/fbdev/core/cfbimgblt.c:302 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1207 [inline] vga16fb_imageblit+0x693/0x2210 drivers/video/fbdev/vga16fb.c:1260 soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0x1166/0x17d0 drivers/video/fbdev/core/bitblit.c:386 fbcon_cursor+0x537/0x660 drivers/video/fbdev/core/fbcon.c:1411 fbcon_scroll+0x222/0x3600 drivers/video/fbdev/core/fbcon.c:1888 con_scroll+0x5b9/0x6d0 drivers/tty/vt/vt.c:629 lf+0x26b/0x2c0 drivers/tty/vt/vt.c:1489 vc_con_write_normal drivers/tty/vt/vt.c:2805 [inline] do_con_write+0xedd/0x1d70 drivers/tty/vt/vt.c:2909 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3249 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x3ce/0xf80 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x4d9/0x870 drivers/tty/tty_io.c:1046 __kernel_write+0x199/0x570 fs/read_write.c:528 write_pipe_buf+0x153/0x1f0 fs/splice.c:799 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x3dc/0x830 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write fs/splice.c:811 [inline] do_splice_from fs/splice.c:847 [inline] direct_splice_actor+0x228/0x2f0 fs/splice.c:1016 splice_direct_to_actor+0x38c/0x980 fs/splice.c:971 do_splice_direct+0x1b3/0x280 fs/splice.c:1059 do_sendfile+0x55f/0xd40 fs/read_write.c:1540 __do_compat_sys_sendfile fs/read_write.c:1622 [inline] __se_compat_sys_sendfile fs/read_write.c:1605 [inline] __ia32_compat_sys_sendfile+0x1e0/0x220 fs/read_write.c:1605 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline] __do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f1c549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55160cc EFLAGS: 00000296 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000005 RDX: 0000000000000000 RSI: 0000000080004104 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000007 ---[ end trace ffb89f0c7a1759ab ]--- RIP: 0010:update_pvclock_gtod arch/x86/kvm/x86.c:1749 [inline] RIP: 0010:pvclock_gtod_notify+0x193/0x570 arch/x86/kvm/x86.c:7452 Code: 43 18 48 8d 7b 1c 48 89 fa 48 c1 ea 03 89 05 6c ea de 0a 48 b8 00 00 00 00 00 fc ff df 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 <38> 00 70 07 00 d2 0f 85 2b 03 00 00 8b 43 1c 48 8d 7b 20 48 89 fa RSP: 0018:ffffc90000da8be8 EFLAGS: 00010002 RAX: 0000000000000007 RBX: ffffffff8c970980 RCX: ffffffff815a14fb RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8c97099c RBP: ffffffff89b35260 R08: 0000000000000000 R09: ffffffff8c5f0a1f R10: fffffbfff18be143 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89ae9320 FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5516b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000007 CR3: 0000000202954000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400