general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef] CPU: 0 PID: 10156 Comm: syz.3.1533 Not tainted 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:hfsc_qlen_notify+0x2a/0x160 net/sched/sch_hfsc.c:1235 Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 24 db 37 f9 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e3 00 00 00 41 8b 2e 31 ff 89 ee e8 5d RSP: 0018:ffffc9000e14ee90 EFLAGS: 00010203 RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc900062ea000 RSI: 0000000000000267 RDI: 0000000000000268 RBP: dffffc0000000000 R08: ffff8880548d5940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: ffff88802a0eb000 R14: 00000000000002ec R15: ffff88802a0eb000 FS: 00007fbff1d3b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e719ff8 CR3: 00000000481dd000 CR4: 00000000003506f0 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: 0033:0x7fbff0f8e929 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:00007fbff1d3b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbff11b5fa0 RCX: 00007fbff0f8e929 RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000007 RBP: 00007fbff1010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbff11b5fa0 R15: 00007ffd0e0e65f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfsc_qlen_notify+0x2a/0x160 net/sched/sch_hfsc.c:1235 Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 24 db 37 f9 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e3 00 00 00 41 8b 2e 31 ff 89 ee e8 5d RSP: 0018:ffffc9000e14ee90 EFLAGS: 00010203 RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc900062ea000 RSI: 0000000000000267 RDI: 0000000000000268 RBP: dffffc0000000000 R08: ffff8880548d5940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: ffff88802a0eb000 R14: 00000000000002ec R15: ffff88802a0eb000 FS: 00007fbff1d3b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e719ff8 CR3: 00000000481dd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 55 push %rbp 1: 41 57 push %r15 3: 41 56 push %r14 5: 41 55 push %r13 7: 41 54 push %r12 9: 53 push %rbx a: 48 89 f3 mov %rsi,%rbx d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 14: fc ff df 17: e8 24 db 37 f9 call 0xf937db40 1c: 4c 8d b3 ec 02 00 00 lea 0x2ec(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 e3 00 00 00 jne 0x11a 37: 41 8b 2e mov (%r14),%ebp 3a: 31 ff xor %edi,%edi 3c: 89 ee mov %ebp,%esi 3e: e8 .byte 0xe8 3f: 5d pop %rbp