Oops: general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef] CPU: 1 UID: 0 PID: 7003 Comm: syz.1.315 Not tainted 6.16.0-rc4-syzkaller-00319-g05df91921da6 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238 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 00 89 44 f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 19 RSP: 0018:ffffc9001c3ef0b0 EFLAGS: 00010203 RAX: 000000000000005d RBX: 0000000000000000 RCX: ffff88802ee98000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff888034a4c000 RBP: dffffc0000000000 R08: 00000000000002aa R09: 0000000000400000 R10: 0000000000005548 R11: ffffffff897bd460 R12: dffffc0000000000 R13: ffff888034a4c000 R14: 00000000000002ec R15: ffff888034a4c000 FS: 00007fee0cff66c0(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2bc7d4 CR3: 0000000033914000 CR4: 00000000003526f0 Call Trace: qdisc_tree_reduce_backlog+0x299/0x480 net/sched/sch_api.c:811 codel_change+0x859/0xae0 net/sched/sch_codel.c:153 codel_init+0x1f7/0x3e0 net/sched/sch_codel.c:172 qdisc_create+0x7a9/0xea0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x1426/0x2010 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fee0f18e929 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:00007fee0cff6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fee0f3b5fa0 RCX: 00007fee0f18e929 RDX: 0000000000000800 RSI: 0000200000000100 RDI: 0000000000000007 RBP: 00007fee0f210b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fee0f3b5fa0 R15: 00007ffcf779acb8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238 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 00 89 44 f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 19 RSP: 0018:ffffc9001c3ef0b0 EFLAGS: 00010203 RAX: 000000000000005d RBX: 0000000000000000 RCX: ffff88802ee98000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff888034a4c000 RBP: dffffc0000000000 R08: 00000000000002aa R09: 0000000000400000 R10: 0000000000005548 R11: ffffffff897bd460 R12: dffffc0000000000 R13: ffff888034a4c000 R14: 00000000000002ec R15: ffff888034a4c000 FS: 00007fee0cff66c0(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2bc7d4 CR3: 0000000033914000 CR4: 00000000003526f0 ---------------- 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 00 89 44 f8 call 0xf844891c 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 e8 00 00 00 jne 0x11f 37: 41 8b 2e mov (%r14),%ebp 3a: 31 ff xor %edi,%edi 3c: 89 ee mov %ebp,%esi 3e: e8 .byte 0xe8 3f: 19 .byte 0x19