Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 UID: 0 PID: 5340 Comm: syz.0.0 Not tainted 6.16.0-rc5-syzkaller-00053-g8c2e52ebbe88 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:list_empty include/linux/list.h:373 [inline] RIP: 0010:qfq_qlen_notify+0x29/0x70 net/sched/sch_qfq.c:1422 Code: 90 f3 0f 1e fa 41 57 41 56 53 48 89 f3 49 89 fe e8 bc 35 37 f8 4c 8d 7b 58 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 49 b8 9a f8 49 8b 07 4c 39 f8 74 1c RSP: 0018:ffffc9000d3a7088 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880532d4000 RBP: dffffc0000000000 R08: ffff88801c4e2440 R09: 0000000000000002 R10: 00000000ffffffff R11: ffffffff8988f0a0 R12: 0000000000000000 R13: ffff8880532d4000 R14: ffff8880532d4000 R15: 0000000000000058 FS: 00007fb604f926c0(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002340 CR3: 000000003ff45000 CR4: 0000000000352ef0 Call Trace: qdisc_tree_reduce_backlog+0x299/0x480 net/sched/sch_api.c:811 fq_codel_change+0xa96/0xef0 net/sched/sch_fq_codel.c:450 fq_codel_init+0x355/0x960 net/sched/sch_fq_codel.c:487 qdisc_create+0x7a9/0xea0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x1426/0x2010 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb60418e929 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:00007fb604f92038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb6043b5fa0 RCX: 00007fb60418e929 RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000009 RBP: 00007fb604210b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb6043b5fa0 R15: 00007ffdbcf97058 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:list_empty include/linux/list.h:373 [inline] RIP: 0010:qfq_qlen_notify+0x29/0x70 net/sched/sch_qfq.c:1422 Code: 90 f3 0f 1e fa 41 57 41 56 53 48 89 f3 49 89 fe e8 bc 35 37 f8 4c 8d 7b 58 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 49 b8 9a f8 49 8b 07 4c 39 f8 74 1c RSP: 0018:ffffc9000d3a7088 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880532d4000 RBP: dffffc0000000000 R08: ffff88801c4e2440 R09: 0000000000000002 R10: 00000000ffffffff R11: ffffffff8988f0a0 R12: 0000000000000000 R13: ffff8880532d4000 R14: ffff8880532d4000 R15: 0000000000000058 FS: 00007fb604f926c0(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002340 CR3: 000000003ff45000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 41 57 push %r15 7: 41 56 push %r14 9: 53 push %rbx a: 48 89 f3 mov %rsi,%rbx d: 49 89 fe mov %rdi,%r14 10: e8 bc 35 37 f8 call 0xf83735d1 15: 4c 8d 7b 58 lea 0x58(%rbx),%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 49 b8 9a f8 call 0xf89ab881 38: 49 8b 07 mov (%r15),%rax 3b: 4c 39 f8 cmp %r15,%rax 3e: 74 1c je 0x5c