BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1ef44d067 P4D 1ef44d067 PUD 1ea4b0067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5193 Comm: syz-executor.1 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206 RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881ee026e40 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881ebd931c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb568 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebd931c0 FS: 00007f4cae11f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d4f41000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: call_timer_fn+0x36/0x390 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x879/0xbe0 kernel/time/timer.c:1817 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:538 [inline] smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:fib6_flush_trees+0x1/0x330 net/ipv6/ip6_fib.c:2169 Code: e9 a6 f9 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ca f5 ff ff e8 df 06 ba fd e9 c0 f5 ff ff e8 b5 d6 60 fd 0f 1f 44 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 40 01 00 RSP: 0018:ffff8881e73c7230 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1103ad8d896 RBX: ffff8881d6c6c4b0 RCX: dffffc0000000000 RDX: ffffc90000942000 RSI: 0000000000013bb9 RDI: ffff8881d9ae0000 RBP: ffff8881e73c7330 R08: ffffffff82316ca1 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffffffff83da1ac0 R13: dffffc0000000000 R14: ffff8881d3a55000 R15: ffff8881d7749800 rt_genid_bump_ipv6 include/net/net_namespace.h:454 [inline] add_addr+0x247/0x470 net/ipv6/addrconf.c:3142 sit_add_v4_addrs net/ipv6/addrconf.c:3199 [inline] addrconf_sit_config+0x8b7/0x1410 net/ipv6/addrconf.c:3450 addrconf_notify+0x9a5/0xe50 net/ipv6/addrconf.c:3645 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 __dev_notify_flags+0x26e/0x510 net/core/dev.c:1670 dev_change_flags+0xe7/0x190 net/core/dev.c:8015 dev_ifsioc+0x104/0xa60 net/core/dev_ioctl.c:226 dev_ioctl+0x505/0xb40 net/core/dev_ioctl.c:483 sock_do_ioctl+0x295/0x3a0 net/socket.c:1081 sock_ioctl+0x4a4/0x760 net/socket.c:1198 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47 ksys_ioctl fs/ioctl.c:742 [inline] __do_sys_ioctl fs/ioctl.c:749 [inline] __se_sys_ioctl fs/ioctl.c:747 [inline] __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f4caeda4f29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4cae11f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4caeedbf80 RCX: 00007f4caeda4f29 RDX: 0000000020000040 RSI: 0000000000008914 RDI: 0000000000000009 RBP: 00007f4caee14074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4caeedbf80 R15: 00007ffc74882648 Modules linked in: CR2: 0000000000000000 ---[ end trace bce1bd30d7cc7dcc ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206 RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881ee026e40 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881ebd931c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb568 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebd931c0 FS: 00007f4cae11f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d4f41000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: e9 a6 f9 ff ff jmp 0xfffff9ab 5: 89 f9 mov %edi,%ecx 7: 80 e1 07 and $0x7,%cl a: 80 c1 03 add $0x3,%cl d: 38 c1 cmp %al,%cl f: 0f 8c ca f5 ff ff jl 0xfffff5df 15: e8 df 06 ba fd call 0xfdba06f9 1a: e9 c0 f5 ff ff jmp 0xfffff5df 1f: e8 b5 d6 60 fd call 0xfd60d6d9 24: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 41 57 push %r15 2f: 41 56 push %r14 31: 41 55 push %r13 33: 41 54 push %r12 35: 53 push %rbx 36: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp 3a: 48 rex.W 3b: 81 .byte 0x81 3c: ec in (%dx),%al 3d: 40 01 00 rex add %eax,(%rax)