general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 31508 Comm: syz-executor.3 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dst_dev_put+0x1f/0x2a0 net/core/dst.c:156 Code: 1f 84 00 00 00 00 00 0f 1f 40 00 41 55 41 54 55 53 48 89 fb e8 92 bd 61 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 61 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000dc0d78 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffffffff8713c6ee RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff88802ec3856b R10: ffffffff87a5ab35 R11: 1ffff110173a6d37 R12: 0000000000000007 R13: fffffbfff1bd612c R14: 0000607f4608d000 R15: 0000000000000001 FS: 00007f3910be8700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056210473f160 CR3: 000000006815e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rt_fibinfo_free_cpus.part.0+0xda/0x140 net/ipv4/fib_semantics.c:202 rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:194 [inline] fib_nh_common_release+0x10c/0x350 net/ipv4/fib_semantics.c:215 fib_nh_release net/ipv4/fib_semantics.c:227 [inline] free_fib_info_rcu+0x24b/0x4d0 net/ipv4/fib_semantics.c:239 rcu_do_batch kernel/rcu/tree.c:2558 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2793 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 do_softirq.part.0+0xde/0x130 kernel/softirq.c:459 do_softirq kernel/softirq.c:451 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2233 [inline] nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2256 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2344 [inline] nf_ct_iterate_cleanup_net+0x290/0x3f0 net/netfilter/nf_conntrack_core.c:2328 masq_device_event+0xae/0xe0 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2122 call_netdevice_notifiers_extack net/core/dev.c:2134 [inline] call_netdevice_notifiers net/core/dev.c:2148 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8834 dev_change_flags+0x112/0x170 net/core/dev.c:8870 devinet_ioctl+0x15e6/0x1c90 net/ipv4/devinet.c:1142 inet_ioctl+0x1ea/0x330 net/ipv4/af_inet.c:971 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1087 sock_ioctl+0x477/0x6a0 net/socket.c:1214 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3910be8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665d9 RDX: 0000000020000000 RSI: 0000000000008914 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007ffdb12f412f R14: 00007f3910be8300 R15: 0000000000022000 Modules linked in: ---[ end trace 81824f7506d6d648 ]--- RIP: 0010:dst_dev_put+0x1f/0x2a0 net/core/dst.c:156 Code: 1f 84 00 00 00 00 00 0f 1f 40 00 41 55 41 54 55 53 48 89 fb e8 92 bd 61 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 61 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000dc0d78 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffffffff8713c6ee RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff88802ec3856b R10: ffffffff87a5ab35 R11: 1ffff110173a6d37 R12: 0000000000000007 R13: fffffbfff1bd612c R14: 0000607f4608d000 R15: 0000000000000001 FS: 00007f3910be8700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056210473f160 CR3: 000000006815e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600