general protection fault, probably for non-canonical address 0xdffffc0000000037: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001b8-0x00000000000001bf] CPU: 1 PID: 5109 Comm: syz.0.16 Not tainted 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:htb_deactivate net/sched/sch_htb.c:610 [inline] RIP: 0010:htb_qlen_notify+0x2d/0xb0 net/sched/sch_htb.c:1486 Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 f1 a5 38 f9 49 8d 9e b8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 48 8b 2b 31 ff 89 ee e8 2e a9 38 f9 85 RSP: 0018:ffffc90003a66e90 EFLAGS: 00010202 RAX: ffffffff8848319f RBX: 00000000000001b8 RCX: ffff888031085940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88803040e000 RBP: dffffc0000000000 R08: ffff888031085940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000037 R14: 0000000000000000 R15: ffff88803040e000 FS: 00007feea6bad6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc998f3f30 CR3: 000000005b85f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x287/0x470 net/sched/sch_api.c:807 codel_change+0x970/0xdb0 net/sched/sch_codel.c:177 codel_init+0x1d4/0x3a0 net/sched/sch_codel.c:196 qdisc_create+0x7cb/0x1090 net/sched/sch_api.c:1310 tc_modify_qdisc+0xb0f/0x1be0 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x79b/0xed0 net/core/rtnetlink.c:6153 netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2493 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x74c/0x8c0 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x59b/0x970 net/socket.c:2519 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573 __sys_sendmsg net/socket.c:2602 [inline] __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7feea5d8e929 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feea6bad038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007feea5fb5fa0 RCX: 00007feea5d8e929 RDX: 000000000000c010 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007feea5e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007feea5fb5fa0 R15: 00007fff691dcbb8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:htb_deactivate net/sched/sch_htb.c:610 [inline] RIP: 0010:htb_qlen_notify+0x2d/0xb0 net/sched/sch_htb.c:1486 Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 f1 a5 38 f9 49 8d 9e b8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 48 8b 2b 31 ff 89 ee e8 2e a9 38 f9 85 RSP: 0018:ffffc90003a66e90 EFLAGS: 00010202 RAX: ffffffff8848319f RBX: 00000000000001b8 RCX: ffff888031085940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88803040e000 RBP: dffffc0000000000 R08: ffff888031085940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000037 R14: 0000000000000000 R15: ffff88803040e000 FS: 00007feea6bad6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc998f3f30 CR3: 000000005b85f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 56 push %r14 2: 41 55 push %r13 4: 41 54 push %r12 6: 53 push %rbx 7: 49 89 f6 mov %rsi,%r14 a: 49 89 ff mov %rdi,%r15 d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 14: fc ff df 17: e8 f1 a5 38 f9 call 0xf938a60d 1c: 49 8d 9e b8 01 00 00 lea 0x1b8(%r14),%rbx 23: 49 89 dd mov %rbx,%r13 26: 49 c1 ed 03 shr $0x3,%r13 * 2a: 43 0f b6 44 25 00 movzbl 0x0(%r13,%r12,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 75 48 jne 0x7c 34: 8b 2b mov (%rbx),%ebp 36: 31 ff xor %edi,%edi 38: 89 ee mov %ebp,%esi 3a: e8 2e a9 38 f9 call 0xf938a96d 3f: 85 .byte 0x85