general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 0 PID: 7523 Comm: syz.0.965 Not tainted 5.15.187-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:qfq_deactivate_class+0x2e/0x1290 net/sched/sch_qfq.c:354 Code: 56 41 55 41 54 53 48 83 ec 60 49 89 f6 49 89 fd 48 bd 00 00 00 00 00 fc ff df e8 1d 51 73 f9 49 8d 7e 68 48 89 f8 48 c1 e8 03 <80> 3c 28 00 74 05 e8 07 ca b8 f9 49 8b 5e 68 4d 8d 7e 58 4c 89 ff RSP: 0018:ffffc900030eeed8 EFLAGS: 00010202 RAX: 000000000000000d RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90015402000 RSI: 00000000000002cb RDI: 0000000000000068 RBP: dffffc0000000000 R08: ffff88802b519dc0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888061dc0000 R13: ffff888061dc02c0 R14: 0000000000000000 R15: ffffffff8b02b120 FS: 00007fb9d70aa6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9d92df394 CR3: 0000000061d16000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x25f/0x430 net/sched/sch_api.c:799 codel_change+0x8d1/0xc00 net/sched/sch_codel.c:183 codel_init+0x190/0x330 net/sched/sch_codel.c:202 qdisc_create+0x7bd/0x1170 net/sched/sch_api.c:1260 tc_modify_qdisc+0xaad/0x16c0 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2489 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x77c/0x920 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x190/0x250 net/socket.c:2526 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb9d9242929 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:00007fb9d70aa038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb9d9469fa0 RCX: 00007fb9d9242929 RDX: 000000000000c010 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007fb9d92c4b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb9d9469fa0 R15: 00007fff8a4bdcf8 Modules linked in: ---[ end trace d6b6b27b31db5c5f ]--- RIP: 0010:qfq_deactivate_class+0x2e/0x1290 net/sched/sch_qfq.c:354 Code: 56 41 55 41 54 53 48 83 ec 60 49 89 f6 49 89 fd 48 bd 00 00 00 00 00 fc ff df e8 1d 51 73 f9 49 8d 7e 68 48 89 f8 48 c1 e8 03 <80> 3c 28 00 74 05 e8 07 ca b8 f9 49 8b 5e 68 4d 8d 7e 58 4c 89 ff RSP: 0018:ffffc900030eeed8 EFLAGS: 00010202 RAX: 000000000000000d RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90015402000 RSI: 00000000000002cb RDI: 0000000000000068 RBP: dffffc0000000000 R08: ffff88802b519dc0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888061dc0000 R13: ffff888061dc02c0 R14: 0000000000000000 R15: ffffffff8b02b120 FS: 00007fb9d70aa6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9d92df394 CR3: 0000000061d16000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 56 push %rsi 1: 41 55 push %r13 3: 41 54 push %r12 5: 53 push %rbx 6: 48 83 ec 60 sub $0x60,%rsp a: 49 89 f6 mov %rsi,%r14 d: 49 89 fd mov %rdi,%r13 10: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 17: fc ff df 1a: e8 1d 51 73 f9 call 0xf973513c 1f: 49 8d 7e 68 lea 0x68(%r14),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 07 ca b8 f9 call 0xf9b8ca3c 35: 49 8b 5e 68 mov 0x68(%r14),%rbx 39: 4d 8d 7e 58 lea 0x58(%r14),%r15 3d: 4c 89 ff mov %r15,%rdi