general protection fault, probably for non-canonical address 0xdffffc0000000d8e: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000000006c70-0x0000000000006c77] CPU: 0 PID: 8436 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:qdisc_pkt_len include/net/sch_generic.h:765 [inline] RIP: 0010:qdisc_qstats_cpu_backlog_dec include/net/sch_generic.h:850 [inline] RIP: 0010:qdisc_update_stats_at_dequeue include/net/sch_generic.h:1080 [inline] RIP: 0010:pfifo_fast_dequeue+0x355/0xb30 net/sched/sch_generic.c:654 Code: df 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 10 07 00 00 4d 8d 6c 24 28 8b 6b 10 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 e5 20 83 c0 03 38 d0 7c 08 84 d2 RSP: 0018:ffffc9000166f1d8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff888016325000 RCX: 0000000000000002 RDX: 0000000000000d8e RSI: ffffffff87258b64 RDI: ffff888016325010 RBP: 0000000000000174 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffff87258b56 R11: 0000000000000000 R12: 0000000000006c4e R13: 0000000000006c76 R14: 0000000000000002 R15: 00000000000003e8 FS: 000000c0001e4c90(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff539f06710 CR3: 0000000024a7f000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dequeue_skb net/sched/sch_generic.c:263 [inline] qdisc_restart net/sched/sch_generic.c:366 [inline] __qdisc_run+0x1ae/0x15f0 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:136 [inline] qdisc_run include/net/pkt_sched.h:128 [inline] __dev_xmit_skb net/core/dev.c:3856 [inline] __dev_queue_xmit+0x1390/0x2e50 net/core/dev.c:4213 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xef0/0x2220 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8d3/0x1a30 net/ipv4/ip_output.c:533 __tcp_transmit_skb+0x1889/0x38f0 net/ipv4/tcp_output.c:1405 __tcp_send_ack.part.0+0x3d6/0x7a0 net/ipv4/tcp_output.c:3970 __tcp_send_ack net/ipv4/tcp_output.c:3976 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3976 tcp_cleanup_rbuf+0x46c/0x5b0 net/ipv4/tcp.c:1598 tcp_recvmsg_locked+0x7aa/0x22f0 net/ipv4/tcp.c:2520 tcp_recvmsg+0x134/0x550 net/ipv4/tcp.c:2550 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:852 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_recvmsg net/socket.c:902 [inline] sock_read_iter+0x33c/0x470 net/socket.c:979 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read+0x5b7/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x1ee/0x250 fs/read_write.c:634 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4af19b Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c000077828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b RDX: 0000000000001000 RSI: 000000c000294000 RDI: 0000000000000006 RBP: 000000c000077878 R08: 0000000000000001 R09: 0000000000000002 R10: 00000000000078b1 R11: 0000000000000212 R12: 00000000000078ad R13: 0000000000000400 R14: 0000000000000004 R15: 0000000000000004 Modules linked in: ---[ end trace 0413819c5cd68f91 ]--- RIP: 0010:qdisc_pkt_len include/net/sch_generic.h:765 [inline] RIP: 0010:qdisc_qstats_cpu_backlog_dec include/net/sch_generic.h:850 [inline] RIP: 0010:qdisc_update_stats_at_dequeue include/net/sch_generic.h:1080 [inline] RIP: 0010:pfifo_fast_dequeue+0x355/0xb30 net/sched/sch_generic.c:654 Code: df 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 10 07 00 00 4d 8d 6c 24 28 8b 6b 10 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 e5 20 83 c0 03 38 d0 7c 08 84 d2 RSP: 0018:ffffc9000166f1d8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff888016325000 RCX: 0000000000000002 RDX: 0000000000000d8e RSI: ffffffff87258b64 RDI: ffff888016325010 RBP: 0000000000000174 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffff87258b56 R11: 0000000000000000 R12: 0000000000006c4e R13: 0000000000006c76 R14: 0000000000000002 R15: 00000000000003e8 FS: 000000c0001e4c90(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff539f06710 CR3: 0000000024a7f000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400