general protection fault, probably for non-canonical address 0xdffffc000000ab91: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000000055c88-0x0000000000055c8f] CPU: 1 PID: 207 Comm: kworker/u4:5 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:dst_dev_put+0x1f/0x2b0 net/core/dst.c:154 Code: 0f 1f 84 00 00 00 00 00 0f 1f 00 41 55 41 54 55 53 48 89 fb e8 a2 35 59 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 29 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000dc0d70 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000055c8c RCX: 0000000000000100 RDX: 000000000000ab91 RSI: ffffffff871c740e RDI: 0000000000055c8c RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888012fa656b R10: ffffffff87af3e90 R11: 0000000000086088 R12: dffffc0000000000 R13: 0000607f46067c78 R14: ffffffff8d6c9324 R15: 0000000000055c8c FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005617306ac458 CR3: 000000001e852000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt_fibinfo_free_cpus.part.0+0xf5/0x180 net/ipv4/fib_semantics.c:202 rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:194 [inline] fib_nh_common_release+0x10c/0x330 net/ipv4/fib_semantics.c:213 fib_nh_release net/ipv4/fib_semantics.c:225 [inline] free_fib_info_rcu+0x24b/0x4e0 net/ipv4/fib_semantics.c:237 rcu_do_batch kernel/rcu/tree.c:2550 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785 __do_softirq+0x29b/0x9c2 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:2219 [inline] nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2242 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2330 [inline] nf_ct_iterate_cleanup_net+0x236/0x400 net/netfilter/nf_conntrack_core.c:2314 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:1996 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1597 unregister_netdevice_many+0x3ff/0x1790 net/core/dev.c:11016 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11569 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 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 0fa4b269c04f05bc ]--- RIP: 0010:dst_dev_put+0x1f/0x2b0 net/core/dst.c:154 Code: 0f 1f 84 00 00 00 00 00 0f 1f 00 41 55 41 54 55 53 48 89 fb e8 a2 35 59 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 29 02 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000dc0d70 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000055c8c RCX: 0000000000000100 RDX: 000000000000ab91 RSI: ffffffff871c740e RDI: 0000000000055c8c RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888012fa656b R10: ffffffff87af3e90 R11: 0000000000086088 R12: dffffc0000000000 R13: 0000607f46067c78 R14: ffffffff8d6c9324 R15: 0000000000055c8c FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005617306ac458 CR3: 000000001e852000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 0f 1f 00 nopl (%rax) b: 41 55 push %r13 d: 41 54 push %r12 f: 55 push %rbp 10: 53 push %rbx 11: 48 89 fb mov %rdi,%rbx 14: e8 a2 35 59 fa callq 0xfa5935bb 19: 48 89 da mov %rbx,%rdx 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 29 02 00 00 jne 0x25d 34: 48 8d 7b 3a lea 0x3a(%rbx),%rdi 38: 4c 8b 23 mov (%rbx),%r12 3b: 48 rex.W 3c: b8 .byte 0xb8 3d: 00 00 add %al,(%rax)