On 06/12/2018 12:46, Greg KH wrote: > On Thu, Dec 06, 2018 at 12:31:15PM +0100, Juergen Gross wrote: >> On 06/12/2018 12:13, Greg KH wrote: >>> On Thu, Nov 29, 2018 at 02:35:17PM +0100, Juergen Gross wrote: >>>> On 29/11/2018 14:26, Kirill A. Shutemov wrote: >>>>> On Thu, Nov 29, 2018 at 09:41:25AM +0000, Juergen Gross wrote: >>>>>> On 29/11/2018 02:22, Hans van Kranenburg wrote: >>>>>>> Hi, >>>>>>> >>>>>>> As also seen at: >>>>>>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914951 >>>>>>> >>>>>>> Attached there are two serial console output logs. One is starting with >>>>>>> Xen 4.11 (from debian unstable) as dom0, and the other one without Xen. >>>>>>> >>>>>>> [ 2.085543] BUG: unable to handle kernel paging request at >>>>>>> ffff888d9fffc000 >>>>>>> [ 2.085610] PGD 200c067 P4D 200c067 PUD 0 >>>>>>> [ 2.085674] Oops: 0000 [#1] SMP NOPTI >>>>>>> [ 2.085736] CPU: 1 PID: 1 Comm: swapper/0 Not tainted >>>>>>> 4.19.0-trunk-amd64 #1 Debian 4.19.5-1~exp1+pvh1 >>>>>>> [ 2.085823] Hardware name: HP ProLiant DL360 G7, BIOS P68 05/21/2018 >>>>>>> [ 2.085895] RIP: e030:ptdump_walk_pgd_level_core+0x1fd/0x490 >>>>>>> [...] >>>>>> >>>>>> The offending stable commit is 4074ca7d8a1832921c865d250bbd08f3441b3657 >>>>>> ("x86/mm: Move LDT remap out of KASLR region on 5-level paging"), this >>>>>> is commit d52888aa2753e3063a9d3a0c9f72f94aa9809c15 upstream. >>>>>> >>>>>> Current upstream kernel is booting fine under Xen, so in general the >>>>>> patch should be fine. Using an upstream kernel built from above commit >>>>>> (with the then needed Xen fixup patch 1457d8cf7664f34c4ba534) is fine, >>>>>> too. >>>>>> >>>>>> Kirill, are you aware of any prerequisite patch from 4.20 which could be >>>>>> missing in 4.19.5? >>>>> >>>>> I'm not. >>>>> >>>>> Let me look into this. >>>>> >>>> >>>> What is making me suspicious is the failure happening just after >>>> releasing the init memory. Maybe there is an access to .init.data >>>> segment or similar? The native kernel booting could be related to the >>>> usage of 2M mappings not being available in a PV-domain. >>> >>> Did this ever get fixed anywhere that I can properly backport it to the >>> 4.19.y tree? >> >> https://lore.kernel.org/lkml/20181130202328.65359-2-kirill.shutemov@xxxxxxxxxxxxxxx/ >> >> Still pending upstream. Just pinged tglx. > > Thanks, it should have gotten a cc: stable@ tag, but I can watch out for > it... It's upstream now: commit 16877a5570e0c5f4270d5b17f9bab427bcae9514 Juergen
