On 07/08/2019 14:26, Marek Marczykowski-Górecki wrote: > Hi, > > Xen 4.12 crashes when booting on UEFI (with multiboot2) unless I disable > runtime services. The crash happens shortly after starting dom0 kernel. > Unfortunately I don't have serial console there, so the only log I have > is a photo of VGA console (attached). Below I retype part of the message: > > (XEN) ----[ Xen-4.12.0-3.fc29 x86_64 debug=n Not tainted ]---- > (XEN) CPU: 0 > (XEN) RIP: e008:[<00000000000000f6>] 00000000000000f6 > (XEN) RFLAGS: 0000000000010287 CONTEXT: hypervisor (d0v0) > ... > (XEN) Xen call trace: > (XEN) [<00000000000000f6>] 00000000000000f6 > (XEN) [<ffff82d08026c6ad>] flushtlb.c#pre_flush+0x3d/0x80 > (XEN) [ ] efi_runtime_call+0x493/0xbd0 > (XEN) [ ] efi_runtime_call+0x441/0xbd0 > (XEN) [ ] vcpu_restore_fpu_nonlazy+0xe7/0x180 > (XEN) [ ] do_platform_op+0/0x1880 > (XEN) [ ] do_platform_op+0xb9c/0x1880 > (XEN) [ ] do_platform_op+0xb9c/0x1880 > (XEN) [ ] sched_credit2.c#csched2_schedule+0xcd0/0x13a0 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] do_platform_op+0/0x1880 > (XEN) [ ] pv_hypercall+0x152/0x220 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0xa2/0x120 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0xa2/0x120 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0xa2/0x120 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0xa2/0x120 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0xa2/0x120 > (XEN) [ ] lstar_enter+0xae/0x120 > (XEN) [ ] lstar_enter+0x10c/0x120 > (XEN) > (XEN) > (XEN) ***************************************** > (XEN) Panic on CPU 0: > (XEN) FATAL TRAP: vector = 0 (divide error) > (XEN) [error_code=0000] > (XEN) ***************************************** > > Any idea?
Very weird. You got a #DE because the instruction under %rip is `div %bh`, but judging from the photo, that page is poisoned anyway. The chances are that something jumped to 0 and has executed it this far through the poisoned page before actually faulting. Can you disassemble pre_flush() ? I don't see anything interesting at the C level. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
