general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 3168 Comm: kworker/0:3 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events iterate_cleanup_work 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 22 03 62 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:ffffc90000007da0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffffffff87137eee RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88802ad5056b R10: ffffffff87a57205 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff1ad5e1c R14: 0000607f46060090 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000267d108 CR3: 000000001670d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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 fib6_info_destroy_rcu+0x187/0x210 net/ipv6/ip6_fib.c:175 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:2241 [inline] nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2264 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2352 [inline] nf_ct_iterate_cleanup_net+0x290/0x3f0 net/netfilter/nf_conntrack_core.c:2336 iterate_cleanup_work+0x45/0x130 net/netfilter/nf_nat_masquerade.c:216 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 9b4335b2c9dc9e1d ]--- 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 22 03 62 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:ffffc90000007da0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffffffff87137eee RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88802ad5056b R10: ffffffff87a57205 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff1ad5e1c R14: 0000607f46060090 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000267d108 CR3: 000000001670d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400