On Fri, Dec 08, 2017 at 03:11:59PM +0000, Jonathan McDowell wrote: > I've been sitting on this for a while and should have spent time to > investigate sooner, but it's been an odd failure mode that wasn't quite > obvious. > > In 4.9 if I cold power on my laptop (Dell E7240) it fails to boot - I > don't see anything after grub says its booting. In 4.10 onwards the > laptop boots, but I get an Oops as part of the boot and ACPI is unhappy > (no suspend, no clean poweroff, no ACPI buttons). The Oops is below; > taken from 4.12 as that's the most recent error dmesg I have saved but > also seen back in 4.10. It's always address 0x30 for the dereference. > > Rebooting the laptop does not lead to these problems; it's *only* from a > complete cold boot that they arise (which didn't help me in terms of > being able to reliably bisect). Once I realised that I was able to > bisect, but it leads me to an odd commit: > > 86d9f48534e800e4d62cdc1b5aaf539f4c1d47d6 > (mm/slab: fix kmemcg cache creation delayed issue) > > If I revert this then I can cold boot without problems. > > Also I don't see the problem with a stock Debian kernel, I think because > the ACPI support is modularised. Hello, Sorry for late response. I was on a long vacation. I have tried to solve the problem however I don't find any clue yet. >From my analysis, oops report shows that 'struct sock *ssk' passed to netlink_broadcast_filtered() is NULL. It means that some of netlink_kernel_create() returns NULL. Maybe, it is due to slab allocation failure. Could you check it by inserting some log on that part? The issue cannot be reproducible in my side so I need your help. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
