Message-ID: <68c4cfc8.050a0220.2ff435.0369.GAE@google.com>
Date: Fri, 12 Sep 2025 18:58:32 -0700
From: syzbot <syzbot+205ef33a3b636b4181fb@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [usb?] BUG: sleeping function called from invalid context in mon_complete

Hello,

syzbot found the following issue on:

HEAD commit:    f777d1112ee5 Merge tag 'vfs-6.17-rc6.fixes' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10d23562580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=429771c55b615e85
dashboard link: https://syzkaller.appspot.com/bug?extid=205ef33a3b636b4181fb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c6eded69cf3a/disk-f777d111.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9b977d9bf359/vmlinux-f777d111.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0743e13a2027/bzImage-f777d111.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+205ef33a3b636b4181fb@...kaller.appspotmail.com

usb 38-1: SetAddress Request (5) to port 0
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 45, name: kworker/1:1
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
6 locks held by kworker/1:1/45:
 #0: ffff888021690938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff888021690938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
 #1: ffffc90000b67bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc90000b67bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
 #2: ffff888146758188 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:911 [inline]
 #2: ffff888146758188 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20 drivers/usb/core/hub.c:5898
 #3: ffff88814675d5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3251 [inline]
 #3: ffff88814675d5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5463 [inline]
 #3: ffff88814675d5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 #3: ffff88814675d5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5870 [inline]
 #3: ffff88814675d5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21b8/0x4a20 drivers/usb/core/hub.c:5952
 #4: ffff8880283ada58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline]
 #4: ffff8880283ada58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 #4: ffff8880283ada58 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5870 [inline]
 #4: ffff8880283ada58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21e5/0x4a20 drivers/usb/core/hub.c:5952
 #5: ffff8880289ba668 (&mbus->lock#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
 #5: ffff8880289ba668 (&mbus->lock#2){+.+.}-{3:3}, at: mon_bus_complete drivers/usb/mon/mon_main.c:134 [inline]
 #5: ffff8880289ba668 (&mbus->lock#2){+.+.}-{3:3}, at: mon_complete+0x5c/0x200 drivers/usb/mon/mon_main.c:147
irq event stamp: 1218766
hardirqs last  enabled at (1218765): [<ffffffff8afa3325>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (1218765): [<ffffffff8afa3325>] _raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194
hardirqs last disabled at (1218766): [<ffffffff8718ba3c>] vhci_urb_enqueue+0xb2c/0xe70 drivers/usb/usbip/vhci_hcd.c:817
softirqs last  enabled at (1211928): [<ffffffff8184cfa4>] __local_bh_enable_ip+0x1a4/0x270 kernel/softirq.c:262
softirqs last disabled at (1211904): [<ffffffff88dfaeaf>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (1211904): [<ffffffff88dfaeaf>] rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
softirqs last disabled at (1211904): [<ffffffff88dfaeaf>] __dev_queue_xmit+0x26f/0x3b70 net/core/dev.c:4650
CPU: 1 UID: 0 PID: 45 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __might_resched+0x44b/0x5d0 kernel/sched/core.c:8957
 __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
 rt_spin_lock+0xc7/0x2c0 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:44 [inline]
 mon_bus_complete drivers/usb/mon/mon_main.c:134 [inline]
 mon_complete+0x5c/0x200 drivers/usb/mon/mon_main.c:147
 usbmon_urb_complete include/linux/usb/hcd.h:738 [inline]
 __usb_hcd_giveback_urb+0x254/0x5e0 drivers/usb/core/hcd.c:1647
 vhci_urb_enqueue+0xb4f/0xe70 drivers/usb/usbip/vhci_hcd.c:818
 usb_hcd_submit_urb+0x320/0x1a80 drivers/usb/core/hcd.c:1546
 usb_start_wait_urb+0x114/0x4c0 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
 hub_set_address drivers/usb/core/hub.c:4769 [inline]
 hub_port_init+0xe24/0x2800 drivers/usb/core/hub.c:5074
 hub_port_connect drivers/usb/core/hub.c:5495 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2532/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
usb 38-1: new SuperSpeed USB device number 5 using vhci_hcd
usb 38-1: device descriptor read/8, error -110
usb usb38-port1: unable to enumerate USB device


---
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