linux-kernel - [syzbot] [usb?] KCSAN: data-race in mon_reader_del / usb_hcd_submit

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Message-ID: <672ca331.050a0220.2dcd8c.0027.GAE@google.com>
Date: Thu, 07 Nov 2024 03:23:29 -0800
From: syzbot <syzbot+c683dd44ac477cf58d36@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [usb?] KCSAN: data-race in mon_reader_del /
 usb_hcd_submit_urb (4)

Hello,

syzbot found the following issue on:

HEAD commit:    7758b206117d Merge tag 'tracefs-v6.12-rc6' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11a8ae30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8028551073794907
dashboard link: https://syzkaller.appspot.com/bug?extid=c683dd44ac477cf58d36
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/1ee9943bd133/disk-7758b206.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9edb15a0c4b5/vmlinux-7758b206.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a602adbca7b6/bzImage-7758b206.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c683dd44ac477cf58d36@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in mon_reader_del / usb_hcd_submit_urb

write to 0xffff8881026af088 of 4 bytes by task 22112 on cpu 1:
 mon_stop drivers/usb/mon/mon_main.c:166 [inline]
 mon_reader_del+0x1bd/0x260 drivers/usb/mon/mon_main.c:73
 mon_bin_release+0x66/0x120 drivers/usb/mon/mon_bin.c:793
 __fput+0x17a/0x6d0 fs/file_table.c:431
 ____fput+0x1c/0x30 fs/file_table.c:459
 task_work_run+0x13a/0x1a0 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x5dd/0x17f0 kernel/exit.c:939
 do_group_exit+0x102/0x150 kernel/exit.c:1088
 get_signal+0xf2a/0x1070 kernel/signal.c:2917
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881026af088 of 4 bytes by task 5308 on cpu 0:
 usbmon_urb_submit include/linux/usb/hcd.h:723 [inline]
 usb_hcd_submit_urb+0x86/0x1510 drivers/usb/core/hcd.c:1518
 usb_submit_urb+0xa80/0xb70 drivers/usb/core/urb.c:581
 usb_start_wait_urb+0x91/0x190 drivers/usb/core/message.c:59
 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

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5308 Comm: kworker/0:4 Tainted: G        W          6.12.0-rc6-syzkaller-00099-g7758b206117d #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: usb_hub_wq hub_event
==================================================================


---
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