BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1d4994067 P4D 1d4994067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 981 Comm: syz.0.173 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e7744ec0 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881ec57b1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9a78 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ec57b1c0 FS: 00007f4cc204b6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001ebf8d000 CR4: 00000000003406b0 DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <IRQ> call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x81d/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 </IRQ> RIP: 0010:check_kcov_mode kernel/kcov.c:164 [inline] RIP: 0010:write_comp_data kernel/kcov.c:208 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x27/0x80 kernel/kcov.c:274 Code: 00 00 00 55 48 89 e5 48 8b 45 08 65 48 8b 15 40 0b a3 7e 65 8b 0d 45 0b a3 7e f7 c1 00 01 1f 00 74 02 5d c3 8b 8a 00 0a 00 00 <83> f9 03 75 f3 48 8b 8a 08 0a 00 00 44 8b 8a 04 0a 00 00 49 c1 e1 RSP: 0018:ffff8881e68dee38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff814fbc95 RBX: 1ffff1103cd1bded RCX: 0000000000000000 RDX: ffff8881e7744ec0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881e68dee38 R08: dffffc0000000000 R09: ffff8881e68deea8 R10: ffffed103cd1bde1 R11: 1ffff1103cd1bdd5 R12: ffff8881e68def60 R13: 1ffff1103cd1bdee R14: 0000000000000000 R15: 0000000000000016 stack_trace_consume_entry+0xa5/0x250 kernel/stacktrace.c:89 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x10d/0x2d0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xdc/0x500 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1080 [inline] nlmsg_new include/net/netlink.h:888 [inline] inet_netconf_notify_devconf+0x169/0x220 net/ipv4/devinet.c:2121 __devinet_sysctl_register+0x324/0x390 net/ipv4/devinet.c:2608 devinet_sysctl_register+0x169/0x1e0 net/ipv4/devinet.c:2642 inetdev_init+0x28a/0x430 net/ipv4/devinet.c:277 inetdev_event+0x1f8/0x1030 net/ipv4/devinet.c:1545 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0xa0/0x120 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] register_netdevice+0xeb9/0x12a0 net/core/dev.c:9240 __ip_tunnel_create+0x2bf/0x380 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x277/0x710 net/ipv4/ip_tunnel.c:1076 ipgre_init_net+0x24/0x30 net/ipv4/ip_gre.c:1032 ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 copy_net_ns+0x314/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x1194/0x2cf0 kernel/fork.c:2055 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f4cc3a03969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4cc204afe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f4cc3c2b080 RCX: 00007f4cc3a03969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000e50c1600 RBP: 00007f4cc3a85ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4cc3c2b080 R15: 00007ffc75dce4e8 Modules linked in: CR2: 0000000000000000 ---[ end trace 507b3619bf910fd8 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e7744ec0 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881ec57b1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9a78 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ec57b1c0 FS: 00007f4cc204b6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001ebf8d000 CR4: 00000000003406b0 DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 55 48 add %dl,0x48(%rbp) 5: 89 e5 mov %esp,%ebp 7: 48 8b 45 08 mov 0x8(%rbp),%rax b: 65 48 8b 15 40 0b a3 mov %gs:0x7ea30b40(%rip),%rdx # 0x7ea30b53 12: 7e 13: 65 8b 0d 45 0b a3 7e mov %gs:0x7ea30b45(%rip),%ecx # 0x7ea30b5f 1a: f7 c1 00 01 1f 00 test $0x1f0100,%ecx 20: 74 02 je 0x24 22: 5d pop %rbp 23: c3 ret 24: 8b 8a 00 0a 00 00 mov 0xa00(%rdx),%ecx * 2a: 83 f9 03 cmp $0x3,%ecx <-- trapping instruction 2d: 75 f3 jne 0x22 2f: 48 8b 8a 08 0a 00 00 mov 0xa08(%rdx),%rcx 36: 44 8b 8a 04 0a 00 00 mov 0xa04(%rdx),%r9d 3d: 49 rex.WB 3e: c1 .byte 0xc1 3f: e1 .byte 0xe1