Hello, syzbot found the following issue on: HEAD commit: 5191249f8803 Add linux-next specific files for 20211118 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=102c939eb00000 kernel config: https://syzkaller.appspot.com/x/.config?x=fca39774e64812b0 dashboard link: https://syzkaller.appspot.com/bug?extid=423eaf1efaa99fb8ce96 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+423eaf1efaa99fb8ce96@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================== WARNING: bad unlock balance detected! 5.16.0-rc1-next-20211118-syzkaller #0 Not tainted ------------------------------------- kworker/1:24/10009 is trying to release lock (hcd->address0_mutex) at: [<ffffffff856171ad>] hub_port_connect drivers/usb/core/hub.c:5402 [inline] [<ffffffff856171ad>] hub_port_connect_change drivers/usb/core/hub.c:5493 [inline] [<ffffffff856171ad>] port_event drivers/usb/core/hub.c:5639 [inline] [<ffffffff856171ad>] hub_event+0x2a9d/0x4450 drivers/usb/core/hub.c:5721 but there are no more locks to release! other info that might help us debug this: 3 locks held by kworker/1:24/10009: #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888012baf138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc9000b9f7db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff888147b82220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff888147b82220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4450 drivers/usb/core/hub.c:5667 stack backtrace: CPU: 1 PID: 10009 Comm: kworker/1:24 Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline] __lock_release kernel/locking/lockdep.c:5316 [inline] lock_release.cold+0x34/0x4e kernel/locking/lockdep.c:5657 __mutex_unlock_slowpath+0x99/0x5e0 kernel/locking/mutex.c:900 hub_port_connect drivers/usb/core/hub.c:5402 [inline] hub_port_connect_change drivers/usb/core/hub.c:5493 [inline] port_event drivers/usb/core/hub.c:5639 [inline] hub_event+0x2a9d/0x4450 drivers/usb/core/hub.c:5721 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 process_scheduled_works kernel/workqueue.c:2361 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2447 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
