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The good news > is good ol' printk debugging seems to be working, and the last message > in the log is indeed related to dw-pci irq affinity control, which is > what the patch touches. So we're on to something. The bad news is I > can't yet figure out what's wrong. > > The CPUs are taken offline one by one, starting with CPU 7. The code in > question runs on the dying CPU, and with hardware interrupts disabled > on all CPUs. The (simplified) call stack looks like this: > > irq_migrate_all_off_this_cpu > for_each_active_irq > migrate_one_irq > irq_do_set_affinity > irq_chip_redirect_set_affinity (via chip->irq_set_affinity) > > The debug patch I gave you adds: > * a printk to irq_chip_redirect_set_affinity (which is very small) > * a printk at the beginning of migrate_one_irq > > Also, the call to irq_do_set_affinity is almost the last thing that > happens in migrate_one_irq, and that for_each_active_irq loop is quite > small too. So, there isn't much happening between the printk in > irq_chip_redirect_set_affinity for the msi irq (which we do see in the > log) and the printk in migrate_one_irq for the next irq (which we don't > see). > > My first thought is to add more printk's between those two and narrow > down the spot where it gets stuck. > > I think the fastest way to debug it is if I can test myself. I tried to > reproduce the issue on a Jetson AGX Orin, and I couldn't. By the way, > how often does it hang? e.g., out of say 10 suspend attempts, how many > fail? For Jetson AGX Xavier it fails on the first suspend attempt. > I do have access to a Jetson Xavier NX (in theory) but it looks like > there's a lab issue with that board, which hopefully gets sorted out > tomorrow. If I can't get a hold of that board (or can't reproduce the > problem on it), I may ask you to try a few other things. In any case, > I'll update this thread again either tomorrow or (more likely) early > next week. Weirdly I don't see this with Jetson Xavier NX. However, could be worth trying but you may wish to revert this change [0] because it is causing other issues for Jetson Xavier NX. Jon [0] https://lore.kernel.org/linux-tegra/e32b0819-2c29-4c83-83d5-e28dc4b2b01f@nvidia.com/ -- nvpublic