BUG: kernel NULL pointer dereference, address: 0000000000000007 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD a84e1067 P4D a84e1067 PUD 2d069067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13423 Comm: syz-executor.2 Not tainted 5.8.0-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 00 00 00 d2 0f 85 2b 03 00 00 8b 43 1c 48 8d 7b 20 48 89 fa RSP: 0018:ffffc90000007be8 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:ffff8880ae600000(0063) knlGS:00000000f54ecb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000007 CR3: 000000004dd80000 CR4: 00000000001526f0 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d ea c8 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc9000745ed20 EFLAGS: 00000282 RAX: 1ffffffff136c6c1 RBX: ffff88805697c180 RCX: 000000001d111d13 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5f09e7 R10: fffffbfff18be13c R11: 0000000000000001 R12: 0000000000000002 R13: ffffffff89bd6340 R14: 0000000000000000 R15: ffff88805697c180 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] is_bpf_text_address+0x36/0x160 kernel/bpf/core.c:704 kernel_text_address kernel/extable.c:151 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:312 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 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:518 [inline] slab_alloc_node mm/slab.c:3254 [inline] kmem_cache_alloc_node+0x136/0x3f0 mm/slab.c:3574 __alloc_skb+0x71/0x550 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1085 [inline] __skb_tstamp_tx+0x169/0x770 net/core/skbuff.c:4698 __dev_queue_xmit+0x1d6f/0x2d60 net/core/dev.c:4072 neigh_hh_output include/net/neighbour.h:498 [inline] neigh_output include/net/neighbour.h:507 [inline] ip_finish_output2+0x1523/0x21f0 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:306 [inline] __ip_finish_output+0x779/0xcb0 net/ipv4/ip_output.c:288 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_mc_output+0x212/0x700 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:443 [inline] ip_local_out net/ipv4/ip_output.c:125 [inline] ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1566 udp_send_skb+0x6cd/0x11a0 net/ipv4/udp.c:948 udp_sendmsg+0x1c6b/0x26c0 net/ipv4/udp.c:1235 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x331/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmmsg+0x296/0x480 net/socket.c:2490 __compat_sys_sendmmsg net/compat.c:361 [inline] __do_compat_sys_sendmmsg net/compat.c:368 [inline] __se_compat_sys_sendmmsg net/compat.c:365 [inline] __ia32_compat_sys_sendmmsg+0x9b/0x100 net/compat.c:365 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: 0023:0xf7f13549 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:00000000f54ec0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000159 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200038c0 RDX: 00000000000000a8 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: CR2: 0000000000000007 ---[ end trace cccfa13d8a81434d ]--- 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 00 00 00 d2 0f 85 2b 03 00 00 8b 43 1c 48 8d 7b 20 48 89 fa RSP: 0018:ffffc90000007be8 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:ffff8880ae600000(0063) knlGS:00000000f54ecb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000007 CR3: 000000004dd80000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400