pt., 29 sty 2021 o 19:59 Marcin Ślusarz <marcin.slusarz@xxxxxxxxx> napisał(a): > > czw., 28 sty 2021 o 15:32 Marcin Ślusarz <marcin.slusarz@xxxxxxxxx> napisał(a): > > > > czw., 28 sty 2021 o 13:39 Rafael J. Wysocki <rafael@xxxxxxxxxx> napisał(a): > > > The only explanation for that I can think about (and which does not > > > involve supernatural intervention so to speak) is a stack corruption > > > occurring between these two calls in sdw_intel_acpi_cb(). IOW, > > > something scribbles on the handle in the meantime, but ATM I have no > > > idea what that can be. > > > > I tried KASAN but it didn't find anything and kernel actually booted > > successfully. > > I investigated this and it looks like a compiler bug (or something nastier), > but I can't find where exactly registers get corrupted because if I add printks > the corruption seems on the printk side, but if I don't add them it seems > the value gets corrupted earlier. (...) > I'm using gcc 10.2.1 from Debian testing. Someone on IRC, after hearing only that "gcc miscompiles the kernel", suggested disabling CONFIG_STACKPROTECTOR_STRONG. It helped indeed and it matches my observations, so it's quite likely it is the culprit. What do we do now? Marcin
