Hi again, Did a bit more testing and found another lock that would be nice to remove, the /dev/bus/usb/$BUS/$DEV file for the hub is also locked: Bus 003 Device 016: ID 1a40:0201 Terminus Technology Inc. FE 2.1 7-port Hub strace lsusb -v ... openat(AT_FDCWD, "/dev/bus/usb/003/016", O_RDWR|O_CLOEXEC... The openat can not be canceled from userspace and even kill -9 won't stop the process until the descriptor read times out. Regards Troels On Tue, 31 Jan 2023 at 21:56, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, Jan 31, 2023 at 03:41:08PM -0500, Alan Stern wrote: > > On Tue, Jan 31, 2023 at 04:59:36PM +0100, Troels Liebe Bentsen wrote: > > > On Fri, 27 Jan 2023 at 17:07, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > Now that I know the config descriptors won't get reallocated after all, > > > > I can remove the locking from the descriptors file entirely. A patch to > > > > do this is below. It ought to fix your problem. Try it and see. > > > > > > Thank you very much, I built a new kernel with the patch and can confirm > > > that it fixes my issue. > > > > > > Will the patch make it into any of the LTS kernels as it could seem like a > > > bugfix depending on how you look at it or is it only destined mainline, fx. 6.2 > > > or 6.3? > > > > I don't know. I will submit it for the -stable kernels, but the > > decision on whether to accept it will be up to Greg KH. > > I'll backport it, as it can help out with systems as Troels said. But > will wait until 6.3-rc1 is out as this should get some testing. > > thanks, > > greg k-h
