netdev - [syzbot ci] Re: net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue

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Message-ID: <687fbeff.a70a0220.21b99c.0011.GAE@google.com>
Date: Tue, 22 Jul 2025 09:40:31 -0700
From: syzbot ci <syzbot+ci9865e4960193441a@...kaller.appspotmail.com>
To: aleksander.lobakin@...el.com, davem@...emloft.net, edumazet@...gle.com, 
	horms@...nel.org, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, 
	kuniyu@...gle.com, linux-kernel-mentees@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	sdf@...ichev.me, skhan@...uxfoundation.org, suchitkarunakaran@...il.com, 
	xiyou.wangcong@...il.com
Cc: syzbot@...ts.linux.dev
Subject: [syzbot ci] Re: net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue_len()

syzbot ci has tested the following series

[v1] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue_len()
https://lore.kernel.org/all/<20250722071508.12497-1-suchitkarunakaran@...il.com>
* [PATCH] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue_len()

and found the following issue:
BUG: unable to handle kernel paging request in dev_qdisc_change_tx_queue_len

Full report is available here:
https://ci.syzbot.org/series/75b0a15e-cca4-4e46-8bf9-595c0dd34915

***

BUG: unable to handle kernel paging request in dev_qdisc_change_tx_queue_len

tree:      netdev
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git
base:      81e0db8e839822b8380ce4716cd564a593ccbfc5
arch:      amd64
compiler:  Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
config:    https://ci.syzbot.org/builds/2ee305f2-ddb8-45c6-8f47-2a150dc6dd22/config
syz repro: https://ci.syzbot.org/findings/1e75a6d3-11ac-48da-af27-60753abb61c7/syz_repro

netlink: 'syz.2.18': attribute type 13 has an invalid length.
netlink: 'syz.2.18': attribute type 17 has an invalid length.
BUG: unable to handle page fault for address: ffffed4821fa6a4b
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 13ffee067 P4D 13ffee067 PUD 0 
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5980 Comm: syz.2.18 Not tainted 6.16.0-rc6-syzkaller-00128-g81e0db8e8398-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:dev_qdisc_change_tx_queue_len+0x542/0x640
Code: be 7f 05 00 00 48 c7 c2 20 d2 95 8c e8 27 db 27 f8 44 89 e0 48 69 c0 c0 01 00 00 49 8d 1c 06 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1f af ab f8 48 8b 1b 4c 8d 73 18
RSP: 0018:ffffc900024beaa0 EFLAGS: 00010a06
RAX: 1ffff14821fa6a4b RBX: ffff8a410fd35258 RCX: ffff888020f2d640
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900024beb90 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade
R10: dffffc0000000000 R11: fffffbfff1f43adf R12: 00000000ffffffff
R13: dffffc0000000000 R14: ffff88810fd35400 R15: ffff88810ffe2018
FS:  00007fa854ede6c0(0000) GS:ffff8881a3c23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed4821fa6a4b CR3: 00000000295fa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 netif_change_tx_queue_len+0x167/0x270
 do_setlink+0xdfb/0x41c0
 rtnl_newlink+0x149f/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa853f8e9a9
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:00007fa854ede038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa8541b5fa0 RCX: 00007fa853f8e9a9
RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007fa854010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa8541b5fa0 R15: 00007ffe5a5f8288
 </TASK>
Modules linked in:
CR2: ffffed4821fa6a4b
---[ end trace 0000000000000000 ]---
RIP: 0010:dev_qdisc_change_tx_queue_len+0x542/0x640
Code: be 7f 05 00 00 48 c7 c2 20 d2 95 8c e8 27 db 27 f8 44 89 e0 48 69 c0 c0 01 00 00 49 8d 1c 06 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1f af ab f8 48 8b 1b 4c 8d 73 18
RSP: 0018:ffffc900024beaa0 EFLAGS: 00010a06
RAX: 1ffff14821fa6a4b RBX: ffff8a410fd35258 RCX: ffff888020f2d640
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900024beb90 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade
R10: dffffc0000000000 R11: fffffbfff1f43adf R12: 00000000ffffffff
R13: dffffc0000000000 R14: ffff88810fd35400 R15: ffff88810ffe2018
FS:  00007fa854ede6c0(0000) GS:ffff8881a3c23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed4821fa6a4b CR3: 00000000295fa000 CR4: 00000000000006f0


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This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.