[BUG] ushc_request -- URB submitted while already active: WARN in usb_submit_urb

[Farhad Alemi]

Hello,

As part of the kernel research at ASU's SEFCOM
lab, we hit the crash below. Crash reports can be found here:

  https://github.com/farhad-alemi/public_bug_reports/tree/main/160-mmc-ushc-urb-submitted-while-active/

  WARNING: drivers/usb/core/urb.c:379 at usb_submit_urb+0x7b/0x18c0,
CPU#1: kworker/1:2/992
  Workqueue: events_freezable mmc_rescan
  RIP: 0010:usb_submit_urb+0x7e/0x18c0
  Call Trace:
   usb_submit_urb+0x7e/0x18c0
   ushc_request+0x3ce/0x8f0
   mmc_start_request+0x202/0x2d0
   mmc_wait_for_req+0xd9/0x240
   mmc_wait_for_cmd+0x183/0x2a0
   sdio_reset+0x1fa/0x3a0
   mmc_rescan+0x6d3/0x1020
   process_scheduled_works+0xc99/0x1900
   worker_thread+0xa53/0xfc0
   kthread+0x38b/0x480
  Kernel panic - not syncing: kernel: panic_on_warn set ...

Our reproducer.c is available upon request.

Happy to test a patch if that would help.

Regards,