Hi , I found a new workaround ... * With PV and set "maxmem=" with a 4+ GB. Example: kernel = '/usr/lib/grub-xen/grub-x86_64-xen.bin' extra = '(hd1)/boot/grub/grub.cfg' root = '' vcpus = '1' memory = '1024' maxmem = '4096' This has the same effect of changing "memory" over 4GB . Regards,On Thu, 28 Oct 2021 23:02:07 +0200 =?utf-8?b?RHIuIE5hZ3kgRWxlbcOpciBLw6Fyb2x5?= <eknagy@omikk.bme.hu> wrote:
> Package: linux-image-5.10.0-9-amd64 > Version: linux-image-5.10.0-9-amd64 and linux-image-5.14.0-0.bpo.2-amd64 > Severity: important > > Dear All, >> I am reporting this bug mostly to help others with the same problem, proposing > adding a warning to the Debian 11 release notes and hoping for an upstream
> kernel bugfix. >> Description: Debian 11 Xen PV DomU (RAM<4GB) does not correctly shuts down > because of a intel_pmc_core module problems on Intel Xeon E3-1230 (and possibly
> other Intel CPUs). >> https://github.com/QubesOS/qubes-issues/issues/6052 seems to be the same issue.
> > Workarounds: > * Use a Debian 10 kernel in the DomU, which works > * Allocate 4+ GB RAM to the DomU> * Use PVH instead of PV (needs Xen 4.9+, and is the preferred way since Xen
> 4.10) > > Please note:> * Backports kernel (linux-image-5.14.0-0.bpo.2-amd64) suffers from the same
> problem. > * Debian 10 Dom0 Xen 4.11.4+107-gef32c7afa2-1 beheaves the same way> * Debian 9 Dom0 Xen 4.8.5.final+shim4.10.4-1+deb9u12 used PVHv1, which differs
> from PVHv2 used by Xen 4.09+ > > Test case:> * Install Debian 10 or Debian 11, install Xen, create a PV config as below and > upon startup "BUG: unable to handle page fault for address" is displayed and it
> fails to stop with "poweroff" later. > kernel = "/usr/lib/grub-xen/grub-x86_64-xen.bin" > extra = '(hd1)/boot/grub/grub.cfg' > * Change PV to PVH and it works correctly: > kernel = "/root/xen/images/debian11/vmlinuz-5.10.0-9-amd64" > ramdisk = "/root/xen/images/debian11/initrd.img-5.10.0-9-amd64" > type = 'pvh' > > The full bug in my case:> [ 3.088164] BUG: unable to handle page fault for address: ffffc9004049b818
> [ 3.088175] #PF: supervisor read access in kernel mode > [ 3.088179] #PF: error_code(0x0000) - not-present page > [ 3.088183] PGD 7fbd9067 P4D 7fbd9067 PUD 5186067 PMD 5303067 PTE 0 > [ 3.088191] Oops: 0000 [#1] SMP NOPTI> [ 3.088195] CPU: 0 PID: 201 Comm: systemd-udevd Not tainted 5.10.0-9-amd64
> #1 Debian 5.10.70-1 > [ 3.088204] RIP: e030:pmc_core_probe+0x136/0x410 [intel_pmc_core]> [ 3.088209] Code: c0 48 c7 c7 48 a6 3c c0 e8 c7 25 d2 c0 48 8b 05 b0 7a 00 > 00 48 c7 83 88 00 00 00 20 a6 3c c0 48 63 40 50 48 03 05 92 7a 00 00 <8b> 00 48
> 8b 15 91 7a 00 00 48 c7 c7 e0 54 3c c0 8b 4a 54 ba 01 00 > [ 3.088222] RSP: e02b:ffffc9004026fc30 EFLAGS: 00010286 > [ 3.088226] RAX: ffffc9004049b818 RBX: ffff88800b028400 RCX: > 00000000fe002000 > [ 3.088232] RDX: ffffffffc03ca600 RSI: ffffffffc03c41f6 RDI: > ffffffffc03ca648 > [ 3.088238] RBP: ffff88800b028410 R08: 0000000000000000 R09: > 00000000fe001fff > [ 3.088244] R10: 0000000000007ff0 R11: ffff888008e01740 R12:
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