general protection fault, probably for non-canonical address 0xdffffc00000000cd: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000668-0x000000000000066f] CPU: 0 PID: 3724 Comm: kworker/0:9 Not tainted 5.18.0-rc2-next-20220414-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: mld mld_dad_work RIP: 0010:ip6_rcv_core+0x12e8/0x1dd0 net/ipv6/ip6_input.c:169 Code: c1 ea 03 80 3c 02 00 0f 85 39 09 00 00 4c 89 f2 49 8b 85 b0 02 00 00 48 c1 ea 03 65 48 ff 40 68 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f6 RSP: 0018:ffffc90000007370 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 00000000000000cd RSI: 0000000000000101 RDI: 0000000000000000 RBP: ffff88801a2d9780 R08: 0000000000000001 R09: ffff88801a2d985f R10: ffffffff87fd936e R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801e0cd280 R14: 000000000000066c R15: ffff888029ba0000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555747d708 CR3: 000000004040b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ipv6_rcv+0x75/0x3b0 net/ipv6/ip6_input.c:303 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5408 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5522 netif_receive_skb_internal net/core/dev.c:5608 [inline] netif_receive_skb+0x13e/0x8e0 net/core/dev.c:5667 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] br_pass_frame_up+0x2d2/0x3e0 net/bridge/br_input.c:61 br_handle_frame_finish+0xc65/0x1a80 net/bridge/br_input.c:192 br_nf_hook_thresh+0x2a5/0x360 net/bridge/br_netfilter_hooks.c:1024 br_nf_pre_routing_finish_ipv6+0x684/0xe00 net/bridge/br_netfilter_ipv6.c:206 NF_HOOK include/linux/netfilter.h:307 [inline] br_nf_pre_routing_ipv6+0x42c/0x7b0 net/bridge/br_netfilter_ipv6.c:236 br_nf_pre_routing+0x1477/0x1ec0 net/bridge/br_netfilter_hooks.c:505 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_bridge_pre net/bridge/br_input.c:248 [inline] br_handle_frame+0x8d6/0x1270 net/bridge/br_input.c:392 __netif_receive_skb_core+0xa8d/0x3a10 net/core/dev.c:5302 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5406 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5522 process_backlog+0x3a0/0x7c0 net/core/dev.c:5850 __napi_poll+0xb3/0x6e0 net/core/dev.c:6416 napi_poll net/core/dev.c:6483 [inline] net_rx_action+0x8ec/0xc60 net/core/dev.c:6570 __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 ipv6_get_lladdr+0x297/0x4a0 net/ipv6/addrconf.c:1881 mld_newpack.isra.0+0x382/0x750 net/ipv6/mcast.c:1754 add_grhead+0x283/0x360 net/ipv6/mcast.c:1849 add_grec+0x106a/0x1530 net/ipv6/mcast.c:1987 mld_send_initial_cr.part.0+0xf6/0x230 net/ipv6/mcast.c:2234 mld_send_initial_cr net/ipv6/mcast.c:1232 [inline] mld_dad_work+0x1d3/0x690 net/ipv6/mcast.c:2260 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_rcv_core+0x12e8/0x1dd0 net/ipv6/ip6_input.c:169 Code: c1 ea 03 80 3c 02 00 0f 85 39 09 00 00 4c 89 f2 49 8b 85 b0 02 00 00 48 c1 ea 03 65 48 ff 40 68 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f6 RSP: 0018:ffffc90000007370 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 00000000000000cd RSI: 0000000000000101 RDI: 0000000000000000 RBP: ffff88801a2d9780 R08: 0000000000000001 R09: ffff88801a2d985f R10: ffffffff87fd936e R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801e0cd280 R14: 000000000000066c R15: ffff888029ba0000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555747d708 CR3: 000000000ba8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 7: 0f 85 39 09 00 00 jne 0x946 d: 4c 89 f2 mov %r14,%rdx 10: 49 8b 85 b0 02 00 00 mov 0x2b0(%r13),%rax 17: 48 c1 ea 03 shr $0x3,%rdx 1b: 65 48 ff 40 68 incq %gs:0x68(%rax) 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 4c 89 f0 mov %r14,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 f6 test %esi,%esi