Date: Tue, 3 Jul 2018 20:32:57 +0300 From: Vasily Averin <vvs@...tuozzo.com> To: Solar Designer <solar@...nwall.com> Cc: owl-dev@...ts.openwall.com Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER Dear ALexander, Do you observe host crash on start of microcode_ctl service? I did not found the reason of crash-on boot on my test node, now I think it was caused by some misconfiguration on our buildsystem. I've recompiled kernel manually and successfully bootedit on my test node. However then node was crashed on start of microcode_ctl service on host. I've found that on our kernel __cpuinit moves get_scattered_cpuid_extra() into init section, but this function can be called lagally called after initialization, from microcode_write() -> spec_ctrl_rescan_cpuid() Issue was caused by CONFIG_HOTPLUG_CPU enabled on Red Hat but disabled on our kernels. Therefore I afraid your kernel should be affected too. Could you please clarify this question? Thank you, Vasily Averin On 06/29/2018 07:41 PM, Solar Designer wrote: > Vasily, > > On Fri, Jun 29, 2018 at 07:08:02PM +0300, Vasily Averin wrote: >> On 06/28/2018 05:11 PM, Vasily Averin wrote: >>> On my test node I observe strange exception right on boot of 64-bit kernel, >>> it is not handles properly and writes 0 into EIP and it crashes the kernel. >>> >>> So I'm going to troubloeshoot qemu with gdb, hope it helps tofind the resoun of the trouble. >> >> I have stable reproducer, but even with single-step and hardware breakpoints I still cannot intercept this mysterious exception. >> it adds an extra frame on regular stack, changes EIP to 0, then generates page_fault an crashes. >> >> Alexander, >> could you please drop me your config for 64bit kernel? > > You can get our kernel configs here: > > http://cvsweb.openwall.com/cgi/cvsweb.cgi/Owl/packages/kernel/ > > Meanwhile, Chris who reported the problem on owl-users has confirmed > that Pavel's fix works for him. > > Alexander >
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