Hello, syzbot has tested the proposed patch but the reproducer still triggered crash: WARNING in usbhid_stop usbhid 5-1:0.0: Stop while open = 1 WARNING: CPU: 0 PID: 95 at drivers/hid/usbhid/hid-core.c:1205 usbhid_stop.cold+0x1fb/0x5e6 drivers/hid/usbhid/hid-core.c:1205 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.6.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 panic+0x2aa/0x6e1 kernel/panic.c:221 __warn.cold+0x2f/0x30 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:usbhid_stop.cold+0x1fb/0x5e6 drivers/hid/usbhid/hid-core.c:1205 Code: 48 89 7c 24 08 e8 7b 87 bd fc 48 8b 7c 24 08 e8 a1 57 f7 fd 48 8b 14 24 44 89 f1 48 c7 c7 60 3d 84 86 48 89 c6 e8 23 18 92 fc <0f> 0b e8 54 87 bd fc 48 8d bb ac 1e 00 00 b8 ff ff 37 00 48 89 fa RSP: 0018:ffff8881d5cbf640 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8881bcd1c000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff812974dd RDI: ffffed103ab97eba RBP: ffff8881ccac4000 R08: ffff8881d712e200 R09: ffffed103b646248 R10: ffffed103b646247 R11: ffff8881db23123f R12: ffff8881ccac4008 R13: ffff8881d8859000 R14: 0000000000000001 R15: ffff8881bcd1dfd8 wacom_remove+0x88/0x3b0 drivers/hid/wacom_sys.c:2773 hid_device_remove+0xed/0x1d0 drivers/hid/hid-core.c:2298 __device_release_driver drivers/base/dd.c:1135 [inline] device_release_driver_internal+0x231/0x500 drivers/base/dd.c:1168 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2677 hid_remove_device drivers/hid/hid-core.c:2469 [inline] hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2488 usbhid_disconnect+0x9f/0xe0 drivers/hid/usbhid/hid-core.c:1420 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:436 __device_release_driver drivers/base/dd.c:1137 [inline] device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1168 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2677 usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1238 usb_disconnect+0x293/0x900 drivers/usb/core/hub.c:2211 hub_port_connect drivers/usb/core/hub.c:5046 [inline] hub_port_connect_change drivers/usb/core/hub.c:5335 [inline] port_event drivers/usb/core/hub.c:5481 [inline] hub_event+0x1a1d/0x4300 drivers/usb/core/hub.c:5563 process_one_work+0x94b/0x1620 kernel/workqueue.c:2266 process_scheduled_works kernel/workqueue.c:2328 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2414 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds.. Tested on: commit: 0fa84af8 Merge tag 'usb-serial-5.7-rc1' of https://git.ker.. git tree: https://github.com/google/kasan.git console output: https://syzkaller.appspot.com/x/log.txt?x=16275720100000 kernel config: https://syzkaller.appspot.com/x/.config?x=6b9c154b0c23aecf dashboard link: https://syzkaller.appspot.com/bug?extid=7bf5a7b0f0a1f9446f4c compiler: gcc (GCC) 9.0.0 20181231 (experimental) patch: https://syzkaller.appspot.com/x/patch.diff?x=175205d7e00000
