general protection fault, probably for non-canonical address 0xdffffc0000000037: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001b8-0x00000000000001bf] CPU: 0 PID: 23297 Comm: syz.3.4847 Tainted: G W 6.1.145-syzkaller-00038-g3b4ff5af8d36 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:htb_deactivate net/sched/sch_htb.c:610 [inline] RIP: 0010:htb_qlen_notify+0x30/0xc0 net/sched/sch_htb.c:1495 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 6e cf 6e fd 4d 8d ae b8 01 00 00 4c 89 eb 48 c1 eb 03 <42> 0f b6 04 23 84 c0 75 56 45 8b 65 00 31 ff 44 89 e6 e8 69 d3 6e RSP: 0018:ffffc90000db6e30 EFLAGS: 00010202 RAX: ffffffff84013312 RBX: 0000000000000037 RCX: 0000000000080000 RDX: ffffc90003ac3000 RSI: 000000000000016f RDI: 0000000000000170 RBP: ffffc90000db6e58 R08: ffff8881387cd100 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff840132f0 R12: dffffc0000000000 R13: 00000000000001b8 R14: 0000000000000000 R15: ffff88813d7e4000 FS: 00007f3b115d66c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000240 CR3: 000000011f7ff000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x20a/0x360 net/sched/sch_api.c:808 codel_change+0x8b8/0xbf0 net/sched/sch_codel.c:177 codel_init+0x1ea/0x410 net/sched/sch_codel.c:196 qdisc_create+0x7f3/0x1040 net/sched/sch_api.c:1311 tc_modify_qdisc+0x8ea/0x1900 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x9f4/0xcf0 net/core/rtnetlink.c:6153 netlink_rcv_skb+0x1f2/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6171 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x8b1/0xa30 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x8aa/0xbc0 net/netlink/af_netlink.c:1860 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5a9/0x990 net/socket.c:2509 ___sys_sendmsg+0x21c/0x290 net/socket.c:2563 __sys_sendmsg net/socket.c:2592 [inline] __do_sys_sendmsg net/socket.c:2601 [inline] __se_sys_sendmsg net/socket.c:2599 [inline] __x64_sys_sendmsg+0x1f0/0x2c0 net/socket.c:2599 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7f3b1078eb69 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:00007f3b115d6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3b109b5fa0 RCX: 00007f3b1078eb69 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007f3b10811df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3b109b5fa0 R15: 00007ffe038a17a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:htb_deactivate net/sched/sch_htb.c:610 [inline] RIP: 0010:htb_qlen_notify+0x30/0xc0 net/sched/sch_htb.c:1495 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 6e cf 6e fd 4d 8d ae b8 01 00 00 4c 89 eb 48 c1 eb 03 <42> 0f b6 04 23 84 c0 75 56 45 8b 65 00 31 ff 44 89 e6 e8 69 d3 6e RSP: 0018:ffffc90000db6e30 EFLAGS: 00010202 RAX: ffffffff84013312 RBX: 0000000000000037 RCX: 0000000000080000 RDX: ffffc90003ac3000 RSI: 000000000000016f RDI: 0000000000000170 RBP: ffffc90000db6e58 R08: ffff8881387cd100 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff840132f0 R12: dffffc0000000000 R13: 00000000000001b8 R14: 0000000000000000 R15: ffff88813d7e4000 FS: 00007f3b115d66c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000240 CR3: 000000011f7ff000 CR4: 00000000003506b0 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 6e cf 6e fd call 0xfd6ecf8a 1c: 4d 8d ae b8 01 00 00 lea 0x1b8(%r14),%r13 23: 4c 89 eb mov %r13,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 0f b6 04 23 movzbl (%rbx,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 75 56 jne 0x89 33: 45 8b 65 00 mov 0x0(%r13),%r12d 37: 31 ff xor %edi,%edi 39: 44 89 e6 mov %r12d,%esi 3c: e8 .byte 0xe8 3d: 69 .byte 0x69 3e: d3 .byte 0xd3 3f: 6e outsb %ds:(%rsi),(%dx)