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: 7047 Comm: syz-executor840 Not tainted 5.7.0-rc6-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+0xa75/0x11b0 net/sched/sch_fq_codel.c:230
Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 b3 6b 27 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1
RSP: 0018:ffffc900017e7690 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900017e7870
RDX: 0000000000000000 RSI: ffffffff864bc96d RDI: 0000000000000000
RBP: ffffc900017e77a0 R08: ffff8880a8c1c480 R09: fffffbfff185dd44
R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400
R13: dffffc0000000000 R14: ffff888089a60000 R15: ffffc900017e7870
FS:  0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000091ec840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000100 CR3: 00000000a7e9a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dev_xmit_skb net/core/dev.c:3710 [inline]
 __dev_queue_xmit+0x154a/0x30a0 net/core/dev.c:4021
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x24fd/0x5e90 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 sock_write_iter+0x289/0x3c0 net/socket.c:1004
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write+0x4a2/0x700 fs/read_write.c:484
 __vfs_write+0xc9/0x100 fs/read_write.c:497
 vfs_write+0x268/0x5d0 fs/read_write.c:559
 ksys_write+0x1ee/0x250 fs/read_write.c:612
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
---[ end trace b26c8d33cfea1fd2 ]---
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+0xa75/0x11b0 net/sched/sch_fq_codel.c:230
Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 b3 6b 27 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1
RSP: 0018:ffffc900017e7690 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900017e7870
RDX: 0000000000000000 RSI: ffffffff864bc96d RDI: 0000000000000000
RBP: ffffc900017e77a0 R08: ffff8880a8c1c480 R09: fffffbfff185dd44
R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400
R13: dffffc0000000000 R14: ffff888089a60000 R15: ffffc900017e7870
FS:  0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000091ec840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000100 CR3: 00000000a7e9a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400