On Mon, Mar 03, 2025 at 09:00:28PM +0100, Lukas Wunner wrote: > On Wed, Feb 26, 2025 at 11:19:58AM +0200, Mika Westerberg wrote: > > On Wed, Feb 26, 2025 at 10:10:43AM +0100, Lukas Wunner wrote: > > > On Wed, Feb 26, 2025 at 10:44:04AM +0200, Mika Westerberg wrote: > > > > [Meteor Lake host] <--> [TB 4 dock] <--> [TB 3 NVMe] > > > [...] > > > > I added "no_console_suspend" to the command line and the did sysrq-w to > > > > get list of blocked tasks. I've attached it just in case it is needed. > > > > > > This looks like the deadlock we've had for years when hot-removing > > > nested hotplug ports. > > > > > > If you attach only a single device to the host, I guess the issue > > > does not occur, right? > > > > Yes. > > > > > Previous attempts to fix this: > > > > > > https://lore.kernel.org/all/4c882e25194ba8282b78fe963fec8faae7cf23eb.1529173804.git.lukas@xxxxxxxxx/ > > > > > > https://lore.kernel.org/all/20240612181625.3604512-1-kbusch@xxxxxxxx/ > > > > Well, it does not happen if I revert the commit so isn't that a > > regresssion? > > Does the below fix the issue? Unfortunately I still see the same hang. I double checked, with revert the problem goes a way and with this patch I still see it. Steps: 1. Boot the system, nothing connected. 2. Connect TBT 4 dock to the host. 3. Connect TBT 3 NVMe to the TBT4 doc. 4. Authorize both PCIe tunnels, verify devices are there. 5. Enter s2idle. 6. Unplug the TBT 4 dock from the host. 7. Exit s2idle.
