general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 PID: 29296 Comm: syz-executor.1 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 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: f3 73 3a fa 45 39 ec 0f 83 cb 00 00 00 e8 15 6e 3a fa 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:ffffc90000bd7588 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000de71000 RDX: 0000000000000000 RSI: ffffffff873a654b RDI: 0000000000000003 RBP: ffffc90000bd7728 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff873a64ab R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880785f0000 FS: 0000000000000000(0000) GS:ffff88802cc00000(0063) knlGS:00000000f54f7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020c00000 CR3: 00000000751d4000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dev_xmit_skb net/core/dev.c:3898 [inline] __dev_queue_xmit+0x18b8/0x2e30 net/core/dev.c:4213 __bpf_tx_skb net/core/filter.c:2113 [inline] __bpf_redirect_no_mac net/core/filter.c:2138 [inline] __bpf_redirect+0x548/0xc80 net/core/filter.c:2161 ____bpf_clone_redirect net/core/filter.c:2445 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2417 bpf_prog_1a6a9bbeba7255d3+0x59/0x4c4 bpf_dispatcher_nop_func include/linux/bpf.h:684 [inline] bpf_test_run+0x45f/0xaa0 net/bpf/test_run.c:117 bpf_prog_test_run_skb+0xabc/0x1c70 net/bpf/test_run.c:656 bpf_prog_test_run kernel/bpf/syscall.c:3149 [inline] __do_sys_bpf+0x218b/0x4f40 kernel/bpf/syscall.c:4428 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x67/0xe0 arch/x86/entry/common.c:143 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:168 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7efd549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f54f75fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000080 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace c63ddf483bd1e59c ]--- 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: f3 73 3a fa 45 39 ec 0f 83 cb 00 00 00 e8 15 6e 3a fa 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:ffffc90000bd7588 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000de71000 RDX: 0000000000000000 RSI: ffffffff873a654b RDI: 0000000000000003 RBP: ffffc90000bd7728 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff873a64ab R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880785f0000 FS: 0000000000000000(0000) GS:ffff88802cc00000(0063) knlGS:00000000f54f7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020c00000 CR3: 00000000751d4000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400