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: 141 Comm: kworker/0:2 Not tainted 5.18.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: mld mld_ifc_work RIP: 0010:ip6_rcv_core+0xffb/0x1c70 net/ipv6/ip6_input.c:169 Code: 3c 02 00 0f 85 c6 09 00 00 48 8b 04 24 4c 89 f2 48 c1 ea 03 48 8b 80 b0 02 00 00 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 7f RSP: 0018:ffffc90000007c78 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87496221 RDX: 00000000000000cd RSI: ffffffff89f00fa0 RDI: ffffffff8942d960 RBP: ffff888022001b40 R08: 0000000000000000 R09: ffff888022001c17 R10: ffffed1004400382 R11: 0000000000000001 R12: ffff88801f50a000 R13: ffff888076b702b0 R14: 000000000000066c R15: ffff888022001bb0 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb66900e420 CR3: 000000000aa8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ipv6_rcv+0x6a/0x320 net/ipv6/ip6_input.c:303 __netif_receive_skb_one_core+0x104/0x180 net/core/dev.c:5408 process_backlog+0x2e4/0x6d0 net/core/dev.c:5850 __napi_poll+0x96/0x510 net/core/dev.c:6416 napi_poll net/core/dev.c:6483 [inline] net_rx_action+0x7b2/0xb40 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 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:764 [inline] ip6_finish_output2+0x47d/0x1210 net/ipv6/ip6_output.c:127 dst_output include/net/dst.h:451 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] mld_sendpack+0x8e6/0xc70 net/ipv6/mcast.c:1818 mld_send_cr net/ipv6/mcast.c:2119 [inline] mld_ifc_work+0x565/0xa90 net/ipv6/mcast.c:2651 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 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+0xffb/0x1c70 net/ipv6/ip6_input.c:169 Code: 3c 02 00 0f 85 c6 09 00 00 48 8b 04 24 4c 89 f2 48 c1 ea 03 48 8b 80 b0 02 00 00 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 7f RSP: 0018:ffffc90000007c78 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87496221 RDX: 00000000000000cd RSI: ffffffff89f00fa0 RDI: ffffffff8942d960 RBP: ffff888022001b40 R08: 0000000000000000 R09: ffff888022001c17 R10: ffffed1004400382 R11: 0000000000000001 R12: ffff88801f50a000 R13: ffff888076b702b0 R14: 000000000000066c R15: ffff888022001bb0 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb66900e420 CR3: 000000000aa8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 02 cmp $0x2,%al 2: 00 0f add %cl,(%rdi) 4: 85 c6 test %eax,%esi 6: 09 00 or %eax,(%rax) 8: 00 48 8b add %cl,-0x75(%rax) b: 04 24 add $0x24,%al d: 4c 89 f2 mov %r14,%rdx 10: 48 c1 ea 03 shr $0x3,%rdx 14: 48 8b 80 b0 02 00 00 mov 0x2b0(%rax),%rax 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 .byte 0x85 3f: 7f .byte 0x7f