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: 6515 Comm: syz-executor644 Not tainted 5.15.0-rc3-next-20211001-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+0x83e/0x10c0 net/sched/sch_fq_codel.c:230 Code: 78 13 2a fa 45 39 ec 0f 83 cb 00 00 00 e8 5a 11 2a fa 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:ffffc90002baf480 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff874c5de6 RDI: 0000000000000003 RBP: ffffc90002baf650 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff874c5d46 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88801cc30000 FS: 0000555555677300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91443596c0 CR3: 000000006fb7e000 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:3773 __dev_xmit_skb net/core/dev.c:3857 [inline] __dev_queue_xmit+0x1f0e/0x36e0 net/core/dev.c:4172 __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x5ba/0xd20 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2429 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401 bpf_prog_cc75667d52cf7bb0+0x56/0xe18 bpf_dispatcher_nop_func include/linux/bpf.h:720 [inline] __bpf_prog_run include/linux/filter.h:625 [inline] bpf_prog_run include/linux/filter.h:632 [inline] bpf_test_run+0x381/0xa30 net/bpf/test_run.c:119 bpf_prog_test_run_skb+0xb3b/0x1e80 net/bpf/test_run.c:668 bpf_prog_test_run kernel/bpf/syscall.c:3307 [inline] __sys_bpf+0x2137/0x5df0 kernel/bpf/syscall.c:4605 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4689 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: 0033:0x7fec5905f4d9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd61cefde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fec5905f4d9 RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a RBP: 00007fec590234c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fec59023550 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 8e3a3971fe6c3d60 ]--- 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: 78 13 2a fa 45 39 ec 0f 83 cb 00 00 00 e8 5a 11 2a fa 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:ffffc90002baf480 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff874c5de6 RDI: 0000000000000003 RBP: ffffc90002baf650 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff874c5d46 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88801cc30000 FS: 0000555555677300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91443596c0 CR3: 000000006fb7e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 78 13 js 0x15 2: 2a fa sub %dl,%bh 4: 45 39 ec cmp %r13d,%r12d 7: 0f 83 cb 00 00 00 jae 0xd8 d: e8 5a 11 2a fa callq 0xfa2a116c 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