general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 7070 Comm: syz-executor893 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0x8a3/0x10c0 net/sched/sch_fq_codel.c:230 Code: 43 2b 0b fb 45 39 ec 0f 83 cb 00 00 00 e8 35 2f 0b fb 48 8b 44 24 10 80 38 00 0f 85 32 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 06 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc900061f7680 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86690f3b RDX: 0000000000000000 RSI: ffffffff86690fdb RDI: 0000000000000004 RBP: ffffc900061f7820 R08: 0000000000000001 R09: ffffffff8c5f3aaf R10: 0000000000000400 R11: 0000000000086998 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880848e0000 FS: 00007f8170794700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200001c0 CR3: 0000000099f80000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dev_xmit_skb net/core/dev.c:3794 [inline] __dev_queue_xmit+0x1878/0x2d60 net/core/dev.c:4105 __netlink_deliver_tap_skb net/netlink/af_netlink.c:295 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:313 [inline] netlink_deliver_tap+0x92e/0xb70 net/netlink/af_netlink.c:326 netlink_deliver_tap_kernel net/netlink/af_netlink.c:335 [inline] netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x5e5/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x44aab9 Code: e8 dc 0f 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 1b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8170793ce8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006e0c58 RCX: 000000000044aab9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000006e0c50 R08: 00007f8170794700 R09: 0000000000000000 R10: 00007f8170794700 R11: 0000000000000246 R12: 00000000006e0c5c R13: 00007ffe61a62b3f R14: 00007f81707949c0 R15: 00000000006e0c5c Modules linked in: ---[ end trace e02ec897ba12107a ]--- RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0x8a3/0x10c0 net/sched/sch_fq_codel.c:230 Code: 43 2b 0b fb 45 39 ec 0f 83 cb 00 00 00 e8 35 2f 0b fb 48 8b 44 24 10 80 38 00 0f 85 32 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 06 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc900061f7680 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86690f3b RDX: 0000000000000000 RSI: ffffffff86690fdb RDI: 0000000000000004 RBP: ffffc900061f7820 R08: 0000000000000001 R09: ffffffff8c5f3aaf R10: 0000000000000400 R11: 0000000000086998 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880848e0000 FS: 00007f8170794700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200001c0 CR3: 0000000099f80000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400