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: 10541 Comm: syz-executor.1 Not tainted 5.18.0-rc4-syzkaller-00971-g829b7bdd7044 #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+0x83e/0x10c0 net/sched/sch_fq_codel.c:230 Code: 38 b8 fe f9 45 39 ec 0f 83 cb 00 00 00 e8 2a b5 fe f9 48 8b 44 24 10 80 38 00 0f 85 9a 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 6e 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc9000322f450 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900034c2000 RDX: 0000000000000000 RSI: ffffffff877a7416 RDI: 0000000000000003 RBP: ffffc9000322f630 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff877a7376 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88805a0e0000 FS: 00007fc743572700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c927000 CR3: 000000005951f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_qdisc_enqueue+0x40/0x300 net/core/dev.c:3732 __dev_xmit_skb net/core/dev.c:3821 [inline] __dev_queue_xmit+0x2110/0x3a60 net/core/dev.c:4173 dev_queue_xmit include/linux/netdevice.h:2948 [inline] __bpf_tx_skb net/core/filter.c:2113 [inline] __bpf_redirect_no_mac net/core/filter.c:2138 [inline] __bpf_redirect+0x838/0xe50 net/core/filter.c:2161 ____bpf_clone_redirect net/core/filter.c:2428 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2400 bpf_prog_a125b4b2adfd2a01+0x59/0x5e bpf_dispatcher_nop_func include/linux/bpf.h:853 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_test_run+0x386/0x9d0 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0xb5e/0x1e10 net/bpf/test_run.c:1144 bpf_prog_test_run kernel/bpf/syscall.c:3596 [inline] __sys_bpf+0x185f/0x56b0 kernel/bpf/syscall.c:4907 __do_sys_bpf kernel/bpf/syscall.c:4993 [inline] __se_sys_bpf kernel/bpf/syscall.c:4991 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4991 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc7424890e9 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:00007fc743572168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc74259bf60 RCX: 00007fc7424890e9 RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a RBP: 00007fc7424e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4b8bb42f R14: 00007fc743572300 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+0x83e/0x10c0 net/sched/sch_fq_codel.c:230 Code: 38 b8 fe f9 45 39 ec 0f 83 cb 00 00 00 e8 2a b5 fe f9 48 8b 44 24 10 80 38 00 0f 85 9a 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 6e 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc9000322f450 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900034c2000 RDX: 0000000000000000 RSI: ffffffff877a7416 RDI: 0000000000000003 RBP: ffffc9000322f630 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff877a7376 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88805a0e0000 FS: 00007fc743572700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c927000 CR3: 000000005951f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 38 b8 fe f9 45 39 cmp %bh,0x3945f9fe(%rax) 6: ec in (%dx),%al 7: 0f 83 cb 00 00 00 jae 0xd8 d: e8 2a b5 fe f9 callq 0xf9feb53c 12: 48 8b 44 24 10 mov 0x10(%rsp),%rax 17: 80 38 00 cmpb $0x0,(%rax) 1a: 0f 85 9a 06 00 00 jne 0x6ba 20: 49 8b 07 mov (%r15),%rax 23: 48 89 c2 mov %rax,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 42 80 3c 32 00 cmpb $0x0,(%rdx,%r14,1) <-- trapping instruction 2f: 0f 85 6e 06 00 00 jne 0x6a3 35: 48 8b 10 mov (%rax),%rdx 38: 48 8d 78 28 lea 0x28(%rax),%rdi 3c: 49 89 17 mov %rdx,(%r15) 3f: 48 rex.W