stack segment: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8060 Comm: syz.0.917 Not tainted 5.15.187-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:qdisc_tree_reduce_backlog+0x1f9/0x430 net/sched/sch_api.c:794
Code: 80 3c 28 00 74 08 48 89 df e8 13 2a c8 f9 4d 89 e6 85 ed 74 07 e8 07 b1 82 f9 eb 7b 48 8b 1b 48 8d 43 20 48 89 c5 48 c1 ed 03 <42> 80 7c 2d 00 00 48 89 04 24 74 0d 48 8b 3c 24 e8 e2 29 c8 f9 48
RSP: 0018:ffffc900033cef30 EFLAGS: 00010202
RAX: 0000000000000020 RBX: 0000000000000000 RCX: ffff88802a058000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff88802a058000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888057823800
R13: dffffc0000000000 R14: ffff888057823800 R15: 00000000000afff2
FS: 00007fdf97dbc6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2f87d8 CR3: 0000000056bc4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
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: 0033:0x7fdf99f54929
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:00007fdf97dbc038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdf9a17bfa0 RCX: 00007fdf99f54929
RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000006
RBP: 00007fdf99fd6b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdf9a17bfa0 R15: 00007ffea0642738
</TASK>
Modules linked in:
---[ end trace 694050e7f78312c7 ]---
RIP: 0010:qdisc_tree_reduce_backlog+0x1f9/0x430 net/sched/sch_api.c:794
Code: 80 3c 28 00 74 08 48 89 df e8 13 2a c8 f9 4d 89 e6 85 ed 74 07 e8 07 b1 82 f9 eb 7b 48 8b 1b 48 8d 43 20 48 89 c5 48 c1 ed 03 <42> 80 7c 2d 00 00 48 89 04 24 74 0d 48 8b 3c 24 e8 e2 29 c8 f9 48
RSP: 0018:ffffc900033cef30 EFLAGS: 00010202
RAX: 0000000000000020 RBX: 0000000000000000 RCX: ffff88802a058000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff88802a058000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888057823800
R13: dffffc0000000000 R14: ffff888057823800 R15: 00000000000afff2
FS: 00007fdf97dbc6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2f87d8 CR3: 0000000056bc4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
4: 74 08 je 0xe
6: 48 89 df mov %rbx,%rdi
9: e8 13 2a c8 f9 call 0xf9c82a21
e: 4d 89 e6 mov %r12,%r14
11: 85 ed test %ebp,%ebp
13: 74 07 je 0x1c
15: e8 07 b1 82 f9 call 0xf982b121
1a: eb 7b jmp 0x97
1c: 48 8b 1b mov (%rbx),%rbx
1f: 48 8d 43 20 lea 0x20(%rbx),%rax
23: 48 89 c5 mov %rax,%rbp
26: 48 c1 ed 03 shr $0x3,%rbp
* 2a: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) <-- trapping instruction
30: 48 89 04 24 mov %rax,(%rsp)
34: 74 0d je 0x43
36: 48 8b 3c 24 mov (%rsp),%rdi
3a: e8 e2 29 c8 f9 call 0xf9c82a21
3f: 48 rex.W