general protection fault, probably for non-canonical address 0xdffffc0000000036: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001b0-0x00000000000001b7] CPU: 0 PID: 19729 Comm: syz.6.7307 Tainted: G W 5.15.188-syzkaller-android13-5.15.188_r00 #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+0x30/0xc0 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 be e1 94 fd 4d 8d ae b0 01 00 00 4c 89 eb 48 c1 eb 03 <42> 0f b6 04 23 84 c0 75 58 45 8b 65 00 31 ff 44 89 e6 e8 49 e5 94 RSP: 0018:ffffc90000e66e90 EFLAGS: 00010206 RAX: ffffffff83d3ce12 RBX: 0000000000000036 RCX: 0000000000080000 RDX: ffffc9000a2ef000 RSI: 00000000000001ac RDI: 00000000000001ad RBP: ffffc90000e66eb8 R08: ffff88810d9893c0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: 00000000000001b0 R14: 0000000000000000 R15: ffff888127e62000 FS: 00007fa77df546c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2dba58 CR3: 0000000123271000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x1e8/0x340 net/sched/sch_api.c:800 fq_codel_change+0xa71/0xf10 net/sched/sch_fq_codel.c:438 fq_codel_init+0x342/0xa20 net/sched/sch_fq_codel.c:475 qdisc_create+0x7ed/0x11a0 net/sched/sch_api.c:1261 tc_modify_qdisc+0x896/0x1480 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x9e4/0xb90 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x87c/0xa40 net/netlink/af_netlink.c:1341 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1909 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 net/socket.c:2526 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7fa77f8eb9a9 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:00007fa77df54038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa77fb12fa0 RCX: 00007fa77f8eb9a9 RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000008 RBP: 00007fa77f96dd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa77fb12fa0 R15: 00007fff46696118 Modules linked in: ---[ end trace b2fc3be801c76538 ]--- RIP: 0010:htb_deactivate net/sched/sch_htb.c:609 [inline] RIP: 0010:htb_qlen_notify+0x30/0xc0 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 be e1 94 fd 4d 8d ae b0 01 00 00 4c 89 eb 48 c1 eb 03 <42> 0f b6 04 23 84 c0 75 58 45 8b 65 00 31 ff 44 89 e6 e8 49 e5 94 RSP: 0018:ffffc90000e66e90 EFLAGS: 00010206 RAX: ffffffff83d3ce12 RBX: 0000000000000036 RCX: 0000000000080000 RDX: ffffc9000a2ef000 RSI: 00000000000001ac RDI: 00000000000001ad RBP: ffffc90000e66eb8 R08: ffff88810d9893c0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: 00000000000001b0 R14: 0000000000000000 R15: ffff888127e62000 FS: 00007fa77df546c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2dba58 CR3: 0000000123271000 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 be e1 94 fd call 0xfd94e1da 1c: 4d 8d ae b0 01 00 00 lea 0x1b0(%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 58 jne 0x8b 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: 49 e5 94 rex.WB in $0x94,%eax