BUG: kernel NULL pointer dereference, address: 0000000000000001 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14128 Comm: systemd-udevd Not tainted 5.9.0-rc2-next-20200827-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:1742 [inline] RIP: 0010:pvclock_gtod_notify+0xfa/0x570 arch/x86/kvm/x86.c:7449 Code: 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ab 03 00 00 8b 45 4c 48 8d 7b 10 48 89 fa 48 c1 ea 03 89 05 96 13 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:ffffc90000da8be8 EFLAGS: 00010802 RAX: 0000000000000001 RBX: ffffffff8ca64d60 RCX: ffffffff815a153b RDX: 1ffffffff194c9ae RSI: 0000000000000001 RDI: ffffffff8ca64d70 RBP: ffffffff89b35be0 R08: 0000000000000000 R09: ffffffff8c6a4a1f R10: fffffbfff18d4943 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89aea220 FS: 00007f41a24728c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000001 CR3: 00000000944b2000 CR4: 00000000001526e0 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:652 [inline] timekeeping_update+0x28a/0x4a0 kernel/time/timekeeping.c:746 timekeeping_advance+0x6ad/0xa40 kernel/time/timekeeping.c:2193 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:find_stack lib/stackdepot.c:184 [inline] RIP: 0010:stack_depot_save+0xf2/0x400 lib/stackdepot.c:257 Code: 0f 84 99 00 00 00 83 fe 03 0f 84 8d 00 00 00 83 fe 01 0f 84 8a 00 00 00 41 89 df 41 81 e7 ff ff 0f 00 4a 8b 2c fd e0 d3 d3 8c <48> 85 ed 75 12 e9 b0 00 00 00 48 8b 6d 00 48 85 ed 0f 84 a3 00 00 RSP: 0018:ffffc9000a127a70 EFLAGS: 00000202 RAX: 00000000a46a9a73 RBX: 00000000247a060e RCX: 0000000000000cc0 RDX: 0000000027ed325a RSI: 0000000000000003 RDI: 000000005f158aac RBP: ffff888099496d10 R08: 00000000ac69e876 R09: ffff888093402c68 R10: fffffbfff1578cb9 R11: 0000000000000000 R12: ffffc9000a127ac0 R13: 0000000000000009 R14: 0000000000000009 R15: 00000000000a060e kasan_save_stack+0x32/0x40 mm/kasan/common.c:50 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:517 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:320 [inline] getname+0x8e/0xd0 fs/namei.c:209 do_sys_openat2+0xf5/0x420 fs/open.c:1162 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f41a15b9840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffcf74b3dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000704 RCX: 00007f41a15b9840 RDX: 0000000000000004 RSI: 0000000000080000 RDI: 00007ffcf74b3de0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000012 R10: 0000000000000064 R11: 0000000000000246 R12: 00007ffcf74b4e30 R13: 00007ffcf74b5ec0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000001 ---[ end trace 99c29cc4b2b66080 ]--- RIP: 0010:update_pvclock_gtod arch/x86/kvm/x86.c:1742 [inline] RIP: 0010:pvclock_gtod_notify+0xfa/0x570 arch/x86/kvm/x86.c:7449 Code: 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ab 03 00 00 8b 45 4c 48 8d 7b 10 48 89 fa 48 c1 ea 03 89 05 96 13 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:ffffc90000da8be8 EFLAGS: 00010802 RAX: 0000000000000001 RBX: ffffffff8ca64d60 RCX: ffffffff815a153b RDX: 1ffffffff194c9ae RSI: 0000000000000001 RDI: ffffffff8ca64d70 RBP: ffffffff89b35be0 R08: 0000000000000000 R09: ffffffff8c6a4a1f R10: fffffbfff18d4943 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89aea220 FS: 00007f41a24728c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000001 CR3: 00000000944b2000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400