general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 0 PID: 5318 Comm: syz.1.274 Not tainted 5.15.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:update_vf+0x31/0xfc0 net/sched/sch_hfsc.c:754 Code: 41 54 53 48 83 ec 60 41 89 f7 49 89 fd 49 be 00 00 00 00 00 fc ff df e8 4d 2b 79 f9 4d 8d a5 90 00 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 30 a4 be f9 bb e8 00 00 00 49 03 RSP: 0018:ffffc900033b6e70 EFLAGS: 00010206 RAX: 0000000000000012 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90005789000 RSI: 000000000000032c RDI: 000000000000032d RBP: 1ffffffff1604cd4 R08: ffff88802bb1d940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000090 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f6df9a8c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002340 CR3: 0000000069e7f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hfsc_qlen_notify+0x22/0xb0 net/sched/sch_hfsc.c:1234 qdisc_tree_reduce_backlog+0x25f/0x430 net/sched/sch_api.c:799 fq_codel_change+0xa71/0xf10 net/sched/sch_fq_codel.c:438 fq_codel_init+0x319/0x8f0 net/sched/sch_fq_codel.c:475 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: 0033:0x7f6dfbc24929 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:00007f6df9a8c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6dfbe4bfa0 RCX: 00007f6dfbc24929 RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000008 RBP: 00007f6dfbca6b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6dfbe4bfa0 R15: 00007ffc9d2a2438 Modules linked in: ---[ end trace 33b4c48d4169862b ]--- RIP: 0010:update_vf+0x31/0xfc0 net/sched/sch_hfsc.c:754 Code: 41 54 53 48 83 ec 60 41 89 f7 49 89 fd 49 be 00 00 00 00 00 fc ff df e8 4d 2b 79 f9 4d 8d a5 90 00 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 30 a4 be f9 bb e8 00 00 00 49 03 RSP: 0018:ffffc900033b6e70 EFLAGS: 00010206 RAX: 0000000000000012 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90005789000 RSI: 000000000000032c RDI: 000000000000032d RBP: 1ffffffff1604cd4 R08: ffff88802bb1d940 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000090 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f6df9a8c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002340 CR3: 0000000069e7f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 54 push %r12 2: 53 push %rbx 3: 48 83 ec 60 sub $0x60,%rsp 7: 41 89 f7 mov %esi,%r15d a: 49 89 fd mov %rdi,%r13 d: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 14: fc ff df 17: e8 4d 2b 79 f9 call 0xf9792b69 1c: 4d 8d a5 90 00 00 00 lea 0x90(%r13),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 30 a4 be f9 call 0xf9bea469 39: bb e8 00 00 00 mov $0xe8,%ebx 3e: 49 rex.WB 3f: 03 .byte 0x3