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: 24927 Comm: syz-executor.1 Tainted: G W 5.10.209-syzkaller-00032-gc449d2a618ef #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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+0xd42/0x1540 net/sched/sch_fq_codel.c:230 Code: 5c 24 08 4c 89 6c 24 38 4c 89 f0 48 8b 4c 24 30 42 80 3c 31 00 74 08 4c 89 e7 e8 09 48 c9 fd 4d 8b 24 24 4d 89 e5 49 c1 ed 03 <43> 80 7c 35 00 00 74 08 4c 89 e7 e8 ee 47 c9 fd 49 8b 1c 24 48 8b RSP: 0018:ffffc90000d67600 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11021bd8040 RDX: ffff88810dec0200 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d67770 R08: ffffffff83ded91f R09: ffffffff83c28036 R10: 0000000000000002 R11: ffff88810c132780 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fef50ddc6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2512ed88 CR3: 000000011217e000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dev_xmit_skb net/core/dev.c:3841 [inline] __dev_queue_xmit+0xdfc/0x28e0 net/core/dev.c:4155 dev_queue_xmit+0x17/0x20 net/core/dev.c:4223 packet_snd net/packet/af_packet.c:3036 [inline] packet_sendmsg+0x4526/0x60a0 net/packet/af_packet.c:3068 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x545/0x700 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2014 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fef52068ea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef50ddc0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fef52196f80 RCX: 00007fef52068ea9 RDX: 0000000000000022 RSI: 0000000020000880 RDI: 0000000000000006 RBP: 00007fef520b54a4 R08: 0000000020000040 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fef52196f80 R15: 00007ffd2512eb28 Modules linked in: ---[ end trace 26337a91d6114116 ]--- 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+0xd42/0x1540 net/sched/sch_fq_codel.c:230 Code: 5c 24 08 4c 89 6c 24 38 4c 89 f0 48 8b 4c 24 30 42 80 3c 31 00 74 08 4c 89 e7 e8 09 48 c9 fd 4d 8b 24 24 4d 89 e5 49 c1 ed 03 <43> 80 7c 35 00 00 74 08 4c 89 e7 e8 ee 47 c9 fd 49 8b 1c 24 48 8b RSP: 0018:ffffc90000d67600 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11021bd8040 RDX: ffff88810dec0200 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d67770 R08: ffffffff83ded91f R09: ffffffff83c28036 R10: 0000000000000002 R11: ffff88810c132780 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fef50ddc6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2512ed88 CR3: 000000011217e000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 5c pop %rsp 1: 24 08 and $0x8,%al 3: 4c 89 6c 24 38 mov %r13,0x38(%rsp) 8: 4c 89 f0 mov %r14,%rax b: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx 10: 42 80 3c 31 00 cmpb $0x0,(%rcx,%r14,1) 15: 74 08 je 0x1f 17: 4c 89 e7 mov %r12,%rdi 1a: e8 09 48 c9 fd call 0xfdc94828 1f: 4d 8b 24 24 mov (%r12),%r12 23: 4d 89 e5 mov %r12,%r13 26: 49 c1 ed 03 shr $0x3,%r13 * 2a: 43 80 7c 35 00 00 cmpb $0x0,0x0(%r13,%r14,1) <-- trapping instruction 30: 74 08 je 0x3a 32: 4c 89 e7 mov %r12,%rdi 35: e8 ee 47 c9 fd call 0xfdc94828 3a: 49 8b 1c 24 mov (%r12),%rbx 3e: 48 rex.W 3f: 8b .byte 0x8b