CC: Intel Wired https://lore.kernel.org/all/20231204004003.GB29484@xxxxxxxxxxx/ On Mon, 04 Dec 2023 11:57:44 +0100 Johannes Berg wrote: > On Sun, 2023-12-03 at 23:35 -0800, Marc MERLIN wrote: > > So, I thought that maybe my custom built kernel had options that somehow > > made P17 unhappy, and went to a stock debian kernel. > > It's not really looking better with that kernel unfortunately :-/ > > > > Still seems unhappy with networking, first wireless and then ethtool. > > Adding wireless lists to Cc just in case > > Well clearly something is not unlocking the RTNL, but digging through > the below I only found places that want to acquire the RTNL and wait > forever on it (including wireless), but none that actually got stuck > while having it acquired already. > > > Actually ... no that's wrong. > > I can: > > > > [ 363.945427] INFO: task powertop:6279 blocked for more than 120 seconds. > > > [ 363.945446] Tainted: G U 6.6.3-amd64-preempt-sysrq-20220227 #4 > > > [ 363.945452] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > > [ 363.945456] task:powertop state:D stack:0 pid:6279 ppid:6267 flags:0x00004002 > > > [ 363.945468] Call Trace: > > > [ 363.945473] <TASK> > > > [ 363.945481] __schedule+0xba0/0xc05 > > > [ 363.945497] schedule+0x95/0xce > > > [ 363.945504] schedule_preempt_disabled+0x15/0x22 > > > [ 363.945511] __mutex_lock.constprop.0+0x18b/0x291 > > > [ 363.945520] ? __pfx_pci_pm_runtime_resume+0x40/0x40 > > > [ 363.945531] igc_resume+0x18b/0x1ca [igc 1a96e277f8878a2a3c9599226acd0eeb7de577b7] > > this is trying to acquire the RTNL, by looking at the code > > > > [ 363.945566] __rpm_callback+0x7a/0xe7 > > > [ 363.945578] rpm_callback+0x35/0x64 > > > [ 363.945587] ? __pfx_pci_pm_runtime_resume+0x40/0x40 > > > [ 363.945592] rpm_resume+0x342/0x44a > > > [ 363.945600] ? __kmem_cache_alloc_node+0x123/0x154 > > > [ 363.945614] __pm_runtime_resume+0x5a/0x7a > > > [ 363.945624] dev_ethtool+0x15a/0x24e7 > > but this already holds it > > So looks like bug in the 'igc' driver wrt. runtime PM locking. > > johannes > >
