general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 12677 Comm: syz.3.2229 Not tainted 6.6.98-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:qdisc_tree_reduce_backlog+0x220/0x470 net/sched/sch_api.c:805
Code: 74 08 48 89 ef e8 90 45 56 f9 4d 89 ef 85 db 74 0a e8 a4 96 fd f8 4c 89 f5 eb 7a 48 8b 6d 00 48 8d 45 20 48 89 c3 48 c1 eb 03 <42> 80 3c 33 00 48 89 04 24 74 0d 48 8b 3c 24 e8 5c 45 56 f9 48 8b
RSP: 0018:ffffc9000362edc8 EFLAGS: 00010202
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000002
RDX: ffff888022ffbc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888022ffbc00 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000000affe0
R13: ffff88807ecea800 R14: dffffc0000000000 R15: ffff88807ecea800
FS: 00007ff96f5d06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3b0d30 CR3: 000000006c4d2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000001000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
codel_change+0x974/0xdb0 net/sched/sch_codel.c:177
codel_init+0x1fd/0x3e0 net/sched/sch_codel.c:196
qdisc_create+0x8eb/0x1050 net/sched/sch_api.c:1322
tc_modify_qdisc+0xb13/0x1be0 net/sched/sch_api.c:-1
rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2537
netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline]
netlink_unicast+0x750/0x8c0 net/netlink/af_netlink.c:1349
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1891
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff96e78e929
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:00007ff96f5d0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff96e9b5fa0 RCX: 00007ff96e78e929
RDX: 0000000000004000 RSI: 0000200000000280 RDI: 0000000000000003
RBP: 00007ff96e810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff96e9b5fa0 R15: 00007ffffdedc278
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qdisc_tree_reduce_backlog+0x220/0x470 net/sched/sch_api.c:805
Code: 74 08 48 89 ef e8 90 45 56 f9 4d 89 ef 85 db 74 0a e8 a4 96 fd f8 4c 89 f5 eb 7a 48 8b 6d 00 48 8d 45 20 48 89 c3 48 c1 eb 03 <42> 80 3c 33 00 48 89 04 24 74 0d 48 8b 3c 24 e8 5c 45 56 f9 48 8b
RSP: 0018:ffffc9000362edc8 EFLAGS: 00010202
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000002
RDX: ffff888022ffbc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888022ffbc00 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000000affe0
R13: ffff88807ecea800 R14: dffffc0000000000 R15: ffff88807ecea800
FS: 00007ff96f5d06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3b0d30 CR3: 000000006c4d2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000001000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 74 08 je 0xa
2: 48 89 ef mov %rbp,%rdi
5: e8 90 45 56 f9 call 0xf956459a
a: 4d 89 ef mov %r13,%r15
d: 85 db test %ebx,%ebx
f: 74 0a je 0x1b
11: e8 a4 96 fd f8 call 0xf8fd96ba
16: 4c 89 f5 mov %r14,%rbp
19: eb 7a jmp 0x95
1b: 48 8b 6d 00 mov 0x0(%rbp),%rbp
1f: 48 8d 45 20 lea 0x20(%rbp),%rax
23: 48 89 c3 mov %rax,%rbx
26: 48 c1 eb 03 shr $0x3,%rbx
* 2a: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) <-- trapping instruction
2f: 48 89 04 24 mov %rax,(%rsp)
33: 74 0d je 0x42
35: 48 8b 3c 24 mov (%rsp),%rdi
39: e8 5c 45 56 f9 call 0xf956459a
3e: 48 rex.W
3f: 8b .byte 0x8b