general protection fault, probably for non-canonical address 0xdffffc0000000036: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001b0-0x00000000000001b7] CPU: 1 PID: 5987 Comm: syz.2.382 Not tainted 5.15.187-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:609 [inline] RIP: 0010:htb_qlen_notify+0x2d/0xb0 net/sched/sch_htb.c:1507 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 c1 49 7a f9 49 8d 9e b0 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4a 8b 2b 31 ff 89 ee e8 fe 4c 7a f9 85 RSP: 0018:ffffc9000312ef38 EFLAGS: 00010206 RAX: ffffffff87fd895f RBX: 00000000000001b0 RCX: 0000000000080000 RDX: ffffc90004ca9000 RSI: 00000000000002cc RDI: 00000000000002cd RBP: 1ffffffff1604bb0 R08: ffff88807ae38000 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000036 R14: 0000000000000000 R15: ffff888074e00000 FS: 00007f5844b456c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561839d83168 CR3: 0000000069a48000 CR4: 00000000003506e0 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: 0033:0x7f5846cdd929 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:00007f5844b45038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5846f04fa0 RCX: 00007f5846cdd929 RDX: 000000000000c010 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007f5846d5fb39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5846f04fa0 R15: 00007ffd5ba299c8 Modules linked in: ---[ end trace ed7b6aa905f5d03f ]--- RIP: 0010:htb_deactivate net/sched/sch_htb.c:609 [inline] RIP: 0010:htb_qlen_notify+0x2d/0xb0 net/sched/sch_htb.c:1507 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 c1 49 7a f9 49 8d 9e b0 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4a 8b 2b 31 ff 89 ee e8 fe 4c 7a f9 85 RSP: 0018:ffffc9000312ef38 EFLAGS: 00010206 RAX: ffffffff87fd895f RBX: 00000000000001b0 RCX: 0000000000080000 RDX: ffffc90004ca9000 RSI: 00000000000002cc RDI: 00000000000002cd RBP: 1ffffffff1604bb0 R08: ffff88807ae38000 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000036 R14: 0000000000000000 R15: ffff888074e00000 FS: 00007f5844b456c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561839d83168 CR3: 0000000069a48000 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 c1 49 7a f9 call 0xf97a49dd 1c: 49 8d 9e b0 01 00 00 lea 0x1b0(%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 4a jne 0x7e 34: 8b 2b mov (%rbx),%ebp 36: 31 ff xor %edi,%edi 38: 89 ee mov %ebp,%esi 3a: e8 fe 4c 7a f9 call 0xf97a4d3d 3f: 85 .byte 0x85