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[Bug 1922617] Re: qemu-aarch64-static "Illegal instruction" with deboots

From: Richard Henderson
Subject: [Bug 1922617] Re: qemu-aarch64-static "Illegal instruction" with debootstrap
Date: Tue, 13 Apr 2021 00:25:42 -0000

Fix commit: 52c01ada8661 ("exec: Fix overlap of PAGE_ANON and

** Changed in: qemu
       Status: In Progress => Fix Committed

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  qemu-aarch64-static "Illegal instruction" with debootstrap

Status in QEMU:
  Fix Committed

Bug description:
  This is reproducible against QEMU master. I apologize for the long
  reproduction steps, I tried to distill it down as much as possible.

  System info:

  # qemu-aarch64-static --version
  qemu-aarch64 version 5.2.91 (v6.0.0-rc1-68-gee82c086ba)
  Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

  # cat /etc/os-release
  PRETTY_NAME="Debian GNU/Linux 10 (buster)"
  NAME="Debian GNU/Linux"
  VERSION="10 (buster)"

  # head -n 26 /proc/cpuinfo
  processor       : 0
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 85
  model name      : Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz
  stepping        : 7
  microcode       : 0x5002f01
  cpu MHz         : 1000.716
  cache size      : 22528 KB
  physical id     : 0
  siblings        : 32
  core id         : 0
  cpu cores       : 16
  apicid          : 0
  initial apicid  : 0
  fpu             : yes
  fpu_exception   : yes
  cpuid level     : 22
  wp              : yes
  flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl 
xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx 
smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe 
popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch 
cpuid_fault epb cat_l3 cdp_l3 invpcid_single intel_ppin ssbd mba ibrs ibpb 
stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase 
tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm mpx rdt_a avx512f avx512dq 
rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt 
xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm 
ida arat pln pts pku ospke avx512_vnni md_clear flush_l1d arch_capabilities
  bugs            : spectre_v1 spectre_v2 spec_store_bypass swapgs taa 
  bogomips        : 4600.00
  clflush size    : 64
  cache_alignment : 64
  address sizes   : 46 bits physical, 48 bits virtual
  power management:

  My reproduction steps:

  # apt-get install --no-install-recommends -y \
      build-essential \
      ca-certificates \
      debootstrap \
      git \
      libglib2.0-dev \
      libpixman-1-dev \
      ninja-build \
      pkg-config \
      python3 \

  # git clone https://github.com/qemu/qemu

  # mkdir qemu/build

  # cd qemu/build

  # ../configure \
      --enable-debug \
      --enable-linux-user \
      --disable-bsd-user \
      --disable-werror \
      --disable-system \
      --disable-tools \
      --disable-docs \
      --disable-gtk \
      --disable-gnutls \
      --disable-nettle \
      --disable-gcrypt \
      --disable-glusterfs \
      --disable-libnfs \
      --disable-libiscsi \
      --disable-vnc \
      --disable-kvm \
      --disable-libssh \
      --disable-libxml2 \
      --disable-vde \
      --disable-sdl \
      --disable-opengl \
      --disable-xen \
      --disable-fdt \
      --disable-vhost-net \
      --disable-vhost-crypto \
      --disable-vhost-user \
      --disable-vhost-vsock \
      --disable-vhost-scsi \
      --disable-tpm \
      --disable-qom-cast-debug \
      --disable-capstone \
      --disable-zstd \
      --disable-linux-io-uring \
      --static \

  # ninja qemu-aarch64

  # install -Dm755 qemu-aarch64 /usr/local/bin/qemu-aarch64-static

  # cat <<'EOF' >/proc/sys/fs/binfmt_misc/register

  # debootstrap --arch arm64 --foreign buster debian-rootfs

  # chroot debian-rootfs /debootstrap/debootstrap --second-stage
  Illegal instruction

  This prevents me from building an arm64 Debian image on x86_64. If I
  am doing something wrong, please let me know. The binary has been
  uploaded for your convenience.

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