linux-kernel - [syzbot] [kernel?] KCSAN: data-race in kick_pool / wq_worker

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Message-ID: <6749d1e2.050a0220.253251.00b7.GAE@google.com>
Date: Fri, 29 Nov 2024 06:38:26 -0800
From: syzbot <syzbot+f8761b2f358f6a1dec5e@...kaller.appspotmail.com>
To: anna-maria@...utronix.de, frederic@...nel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	tglx@...utronix.de
Subject: [syzbot] [kernel?] KCSAN: data-race in kick_pool / wq_worker_running

Hello,

syzbot found the following issue on:

HEAD commit:    7af08b57bcb9 Merge tag 'trace-v6.13-2' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10a39f5f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=77174711582263a3
dashboard link: https://syzkaller.appspot.com/bug?extid=f8761b2f358f6a1dec5e
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/13ed5c4111d5/disk-7af08b57.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b14531c093bd/vmlinux-7af08b57.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0ddfac565b6b/bzImage-7af08b57.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f8761b2f358f6a1dec5e@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in kick_pool / wq_worker_running

read-write to 0xffff888237d2e8a4 of 4 bytes by task 3377 on cpu 1:
 wq_worker_running+0x98/0x130 kernel/workqueue.c:1400
 schedule_timeout+0xb8/0x160 kernel/time/sleep_timeout.c:99
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0xfb/0x1c0 kernel/sched/completion.c:127
 usb_start_wait_urb+0xdc/0x190 drivers/usb/core/message.c:64
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x182/0x240 drivers/usb/core/message.c:154
 get_port_status drivers/usb/core/hub.c:604 [inline]
 hub_ext_port_status+0xbf/0x480 drivers/usb/core/hub.c:621
 usb_hub_port_status drivers/usb/core/hub.c:671 [inline]
 port_event drivers/usb/core/hub.c:5714 [inline]
 hub_event+0x538/0x2910 drivers/usb/core/hub.c:5903
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888237d2e8a4 of 4 bytes by task 3399 on cpu 0:
 need_more_worker kernel/workqueue.c:934 [inline]
 kick_pool+0x4d/0x2c0 kernel/workqueue.c:1240
 __queue_work+0x8bb/0xb40 kernel/workqueue.c:2340
 queue_work_on+0xd3/0x180 kernel/workqueue.c:2390
 wg_queue_enqueue_per_peer_tx+0x124/0x260 drivers/net/wireguard/queueing.h:188
 wg_packet_encrypt_worker+0xa00/0xbb0 drivers/net/wireguard/send.c:305
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3399 Comm: kworker/0:4 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: wg-crypt-wg1 wg_packet_encrypt_worker
==================================================================


---
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