linux-kernel - [syzbot] [net?] WARNING in taprio_get_start

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Message-ID: <67c6cf70.050a0220.15b4b9.000a.GAE@google.com>
Date: Tue, 04 Mar 2025 02:01:20 -0800
From: syzbot <syzbot+2ca2c2f6cd8f0efac48e@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com, vinicius.gomes@...el.com, 
	xiyou.wangcong@...il.com
Subject: [syzbot] [net?] WARNING in taprio_get_start_time

Hello,

syzbot found the following issue on:

HEAD commit:    3424291dd242 Merge branch 'ipv4-fib-convert-rtm_newroute-a..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11226fb8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1770b825960d3ae8
dashboard link: https://syzkaller.appspot.com/bug?extid=2ca2c2f6cd8f0efac48e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/94c5b9f4e9a5/disk-3424291d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2c19be66773b/vmlinux-3424291d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5defd4d4c3bb/bzImage-3424291d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2ca2c2f6cd8f0efac48e@...kaller.appspotmail.com

netlink: 8 bytes leftover after parsing attributes in process `syz.3.1243'.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10562 at net/sched/sch_taprio.c:1223 taprio_get_start_time+0x16d/0x1a0 net/sched/sch_taprio.c:1223
Modules linked in:
CPU: 1 UID: 0 PID: 10562 Comm: syz.3.1243 Not tainted 6.14.0-rc4-syzkaller-00873-g3424291dd242 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:taprio_get_start_time+0x16d/0x1a0 net/sched/sch_taprio.c:1223
Code: 00 74 08 48 89 ef e8 d2 b0 23 f8 48 89 5d 00 31 c0 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 34 70 bc f7 90 <0f> 0b 90 b8 f2 ff ff ff eb dd 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000499ee40 EFLAGS: 00010293
RAX: ffffffff8a054f0c RBX: 0000000000000001 RCX: ffff88807bc0bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888061f902d4 R08: ffffffff8a054eb5 R09: 1ffffffff28a973c
R10: dffffc0000000000 R11: ffffffff816179a0 R12: 0000000000000000
R13: 0000002d526987fd R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fbeb5b246c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f615db80f98 CR3: 0000000058954000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 taprio_change+0x240d/0x44f0 net/sched/sch_taprio.c:1939
 taprio_init+0x9da/0xc80 net/sched/sch_taprio.c:2114
 qdisc_create+0x9d4/0x11a0 net/sched/sch_api.c:1360
 tc_modify_qdisc+0xbbb/0x1f10
 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6928
 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:709 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:724
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2564
 ___sys_sendmsg net/socket.c:2618 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2650
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbeb4d8d169
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:00007fbeb5b24038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbeb4fa5fa0 RCX: 00007fbeb4d8d169
RDX: 0000000000000000 RSI: 00004000000007c0 RDI: 0000000000000004
RBP: 00007fbeb4e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbeb4fa5fa0 R15: 00007ffce7058248
 </TASK>


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