On 30.04.25 14:56, bugzilla-daemon@xxxxxxxxxx wrote:
Exchanging the 2 lines as indicated in the patch solves the problem completely and the kernel panic is not seen anymore. This is proved by 7000 'virtual' disconnects.
Yes, it solves your particular problem. Now, with your patch, you first call acm_submit_read_urbs() -> acm_submit_read_urb(): res = usb_submit_urb(acm->read_urbs[index], mem_flags); And then you do + for (i = 0; i < acm->rx_buflimit; i++) + usb_kill_urb(acm->read_urbs[i]); In other words, you undo what you just did. Your diagnosis of the issue may be good, but the fix is _not_. The purpose of acm_softint() is to 1. kill outstanding IO 2. error handling with usb_clear_halt() 3. restart the outstanding IO You cannot reverse steps 1 and 3 and expect that to work. The issue must be one of refcounting. Sorry Oliver
