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: 10813 Comm: syz-executor.5 Not tainted 5.14.0-rc2-next-20210721-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:br_ip6_multicast_query_received net/bridge/br_multicast.c:3094 [inline] RIP: 0010:br_ip6_multicast_query net/bridge/br_multicast.c:3237 [inline] RIP: 0010:br_multicast_ipv6_rcv net/bridge/br_multicast.c:3598 [inline] RIP: 0010:br_multicast_rcv+0x1a88/0x61a0 net/bridge/br_multicast.c:3653 Code: 8b 53 10 48 8b 43 08 48 89 95 68 ff ff ff 48 8b 95 d8 fe ff ff 48 89 85 60 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 92 41 00 00 48 8b 85 d8 fe ff ff 48 8b 18 48 8b RSP: 0018:ffffc90017dc71e0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88802083c818 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88802083c820 RBP: ffffc90017dc73a0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87f88d93 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88801cc3c8c0 R14: 0000000000000000 R15: ffff88801cc3c974 FS: 00007fca8ec8d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fc22000 CR3: 00000000810d9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: br_dev_xmit+0x6f6/0x1760 net/bridge/br_device.c:89 __netdev_start_xmit include/linux/netdevice.h:4946 [inline] netdev_start_xmit include/linux/netdevice.h:4960 [inline] xmit_one net/core/dev.c:3659 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3675 __dev_queue_xmit+0x2988/0x3620 net/core/dev.c:4285 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x974/0x19d0 net/ipv6/ip6_output.c:145 __ip6_finish_output net/ipv6/ip6_output.c:210 [inline] __ip6_finish_output+0x4c1/0x1050 net/ipv6/ip6_output.c:189 ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:220 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:243 dst_output include/net/dst.h:448 [inline] ip6_local_out+0xaf/0x1a0 net/ipv6/output_core.c:161 ip6_send_skb+0xb7/0x340 net/ipv6/ip6_output.c:1934 ip6_push_pending_frames+0xdd/0x100 net/ipv6/ip6_output.c:1954 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x2a87/0x3990 net/ipv6/raw.c:956 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 sock_write_iter+0x289/0x3c0 net/socket.c:1056 call_write_iter include/linux/fs.h:2152 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 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: 0033:0x4665e9 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:00007fca8ec8d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000042 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd96b8ed1f R14: 00007fca8ec8d300 R15: 0000000000022000 Modules linked in: ---[ end trace 4565426f6e2804dd ]--- RIP: 0010:br_ip6_multicast_query_received net/bridge/br_multicast.c:3094 [inline] RIP: 0010:br_ip6_multicast_query net/bridge/br_multicast.c:3237 [inline] RIP: 0010:br_multicast_ipv6_rcv net/bridge/br_multicast.c:3598 [inline] RIP: 0010:br_multicast_rcv+0x1a88/0x61a0 net/bridge/br_multicast.c:3653 Code: 8b 53 10 48 8b 43 08 48 89 95 68 ff ff ff 48 8b 95 d8 fe ff ff 48 89 85 60 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 92 41 00 00 48 8b 85 d8 fe ff ff 48 8b 18 48 8b RSP: 0018:ffffc90017dc71e0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88802083c818 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88802083c820 RBP: ffffc90017dc73a0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87f88d93 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88801cc3c8c0 R14: 0000000000000000 R15: ffff88801cc3c974 FS: 00007fca8ec8d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fc22000 CR3: 00000000810d9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400