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: 13147 Comm: syz-executor.1 Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316 #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+0xd78/0x15c0 net/sched/sch_fq_codel.c:230 Code: 00 00 44 89 74 24 18 4c 89 6c 24 28 48 8b 44 24 38 42 80 3c 38 00 74 08 48 89 df e8 d2 3d 75 f9 4c 8b 2b 4d 89 ee 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 ef e8 b9 3d 75 f9 4d 8b 65 00 4c 89 fb RSP: 0018:ffffc9001263ee00 EFLAGS: 00010246 RAX: 1ffff11008a86000 RBX: ffff888045430000 RCX: ffff888045430000 RDX: ffffc90005ee5000 RSI: 000000000000070f RDI: 0000000000000710 RBP: ffffc9001263ef90 R08: ffffffff886289d0 R09: fffffbfff1f86d99 R10: fffffbfff1f86d99 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f9e36b72700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e35b9c028 CR3: 000000007dfd8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_qdisc_enqueue net/core/dev.c:3727 [inline] __dev_xmit_skb net/core/dev.c:3816 [inline] __dev_queue_xmit+0xd78/0x3800 net/core/dev.c:4141 __bpf_tx_skb net/core/filter.c:2113 [inline] __bpf_redirect_common net/core/filter.c:2152 [inline] __bpf_redirect+0xa2f/0xfe0 net/core/filter.c:2159 ____bpf_clone_redirect net/core/filter.c:2428 [inline] bpf_clone_redirect+0x243/0x350 net/core/filter.c:2400 bpf_prog_a125b4b2adfd2a01+0x59/0x5e bpf_dispatcher_nop_func include/linux/bpf.h:804 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_test_run+0x42a/0x8c0 net/bpf/test_run.c:401 bpf_prog_test_run_skb+0xb77/0x2110 net/bpf/test_run.c:1110 bpf_prog_test_run kernel/bpf/syscall.c:3369 [inline] __sys_bpf+0x5654/0x12890 kernel/bpf/syscall.c:4681 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline] __se_sys_bpf kernel/bpf/syscall.c:4765 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4765 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9e35a89049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e36b72168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9e35b9bf60 RCX: 00007f9e35a89049 RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a RBP: 00007f9e35ae308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe55c2de6f R14: 00007f9e36b72300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- 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+0xd78/0x15c0 net/sched/sch_fq_codel.c:230 Code: 00 00 44 89 74 24 18 4c 89 6c 24 28 48 8b 44 24 38 42 80 3c 38 00 74 08 48 89 df e8 d2 3d 75 f9 4c 8b 2b 4d 89 ee 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 ef e8 b9 3d 75 f9 4d 8b 65 00 4c 89 fb RSP: 0018:ffffc9001263ee00 EFLAGS: 00010246 RAX: 1ffff11008a86000 RBX: ffff888045430000 RCX: ffff888045430000 RDX: ffffc90005ee5000 RSI: 000000000000070f RDI: 0000000000000710 RBP: ffffc9001263ef90 R08: ffffffff886289d0 R09: fffffbfff1f86d99 R10: fffffbfff1f86d99 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f9e36b72700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e35b9c028 CR3: 000000007dfd8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 44 89 74 24 18 mov %r14d,0x18(%rsp) 7: 4c 89 6c 24 28 mov %r13,0x28(%rsp) c: 48 8b 44 24 38 mov 0x38(%rsp),%rax 11: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 d2 3d 75 f9 callq 0xf9753df2 20: 4c 8b 2b mov (%rbx),%r13 23: 4d 89 ee mov %r13,%r14 26: 49 c1 ee 03 shr $0x3,%r14 * 2a: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 b9 3d 75 f9 callq 0xf9753df2 39: 4d 8b 65 00 mov 0x0(%r13),%r12 3d: 4c 89 fb mov %r15,%rbx