[Qemu-devel] [Bug 1790018] [NEW] Assertion failure (or segmentation fault) running 32-bit x86 Linux guest on 64-bit PowerPC host

[A. Wilcox]

Public bug reported:

Qemu 2.12.1 (also tried 2.12.0)
Linux gwyn 4.14.48-mc8-easy #1 SMP Sat Jun 30 23:29:01 CDT 2018 ppc64 GNU/Linux
gcc (Adelie 6.4.0-r9) 6.4.0
GNU assembler (GNU Binutils) 2.30
musl libc (powerpc64) Version 1.1.19

64-bit, 64-thread (16-core) POWER9 server in Big endian mode:
processor       : 0
cpu             : POWER9, altivec supported
clock           : 3000.000000MHz
revision        : 2.2 (pvr 004e 1202)

Scenario:

Attempting to install Adélie Linux 32-bit x86 guest on 64-bit PowerPC
host using qemu-system-i386.


Command line:

/usr/bin/qemu-system-i386 -cdrom adelie-live-pmmx-1.0-beta1-20180807.iso
-hda /dev/gwyn/x86 -m 512 -cpu pentium3


Environment reproduction:

CD image can be obtained at 
https://distfiles.adelielinux.org/adelie/1.0-beta1/iso/adelie-live-pmmx-1.0-beta1-20180807.iso
/dev/gwyn/x86 is an LVM2 logical volume, 4 GB in size, on NVMe storage
Qemu was built from sources on this machine, with some distribution patches 
applied for musl support (does not affect tcg/ppc/* code); patches and build 
recipe (which was modified: https://bpaste.net/show/1bbb1d07d7f2 for recipe 
patch) can be found at: 
https://code.foxkit.us/adelie/packages/blob/master/user/qemu/APKBUILD


Without --enable-debug-tcg:

Thread 5 "qemu-system-i38" received signal SIGSEGV, Segmentation fault.
[Switching to LWP 14090]
0x39fb04787f63db78 in ?? ()
(gdb)
(gdb) bt
#0  0x39fb04787f63db78 in  ()
#1  0x00003ffff1cdb160 in code_gen_buffer ()
#2  0x0000000100362048 in cpu_tb_exec (itb=<optimized out>, cpu=<optimized 
out>) at /usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:169
#3  0x0000000100362048 in cpu_loop_exec_tb (tb_exit=<synthetic pointer>, 
last_tb=<synthetic pointer>, tb=<optimized out>, cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:626
#4  0x0000000100362048 in cpu_exec (cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:734
#5  0x00000001003211b4 in tcg_cpu_exec (cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/cpus.c:1362
#6  0x00000001003211b4 in qemu_tcg_rr_cpu_thread_fn (arg=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/cpus.c:1461
#7  0x00003ffff7fa275c in start (p=0x3fffedb6a810) at 
src/thread/pthread_create.c:147
#8  0x00003ffff7fae4c8 in __clone () at src/thread/powerpc64/clone.s:43


With --enable-debug-tcg:

Assertion failed: disp == (int16_t) disp 
(/usr/src/packages/user/qemu/src/qemu-2.12.1/tcg/ppc/tcg-target.inc.c: 
reloc_pc14_val: 204)
zsh: abort      qemu-system-i386

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1790018

Title:
  Assertion failure (or segmentation fault) running 32-bit x86 Linux
  guest on 64-bit PowerPC host

Status in QEMU:
  New

Bug description:
  Qemu 2.12.1 (also tried 2.12.0)
  Linux gwyn 4.14.48-mc8-easy #1 SMP Sat Jun 30 23:29:01 CDT 2018 ppc64 
GNU/Linux
  gcc (Adelie 6.4.0-r9) 6.4.0
  GNU assembler (GNU Binutils) 2.30
  musl libc (powerpc64) Version 1.1.19

  64-bit, 64-thread (16-core) POWER9 server in Big endian mode:
  processor       : 0
  cpu             : POWER9, altivec supported
  clock           : 3000.000000MHz
  revision        : 2.2 (pvr 004e 1202)

  Scenario:

  Attempting to install Adélie Linux 32-bit x86 guest on 64-bit PowerPC
  host using qemu-system-i386.

  
  Command line:

  /usr/bin/qemu-system-i386 -cdrom adelie-live-
  pmmx-1.0-beta1-20180807.iso -hda /dev/gwyn/x86 -m 512 -cpu pentium3

  
  Environment reproduction:

  CD image can be obtained at 
https://distfiles.adelielinux.org/adelie/1.0-beta1/iso/adelie-live-pmmx-1.0-beta1-20180807.iso
  /dev/gwyn/x86 is an LVM2 logical volume, 4 GB in size, on NVMe storage
  Qemu was built from sources on this machine, with some distribution patches 
applied for musl support (does not affect tcg/ppc/* code); patches and build 
recipe (which was modified: https://bpaste.net/show/1bbb1d07d7f2 for recipe 
patch) can be found at: 
https://code.foxkit.us/adelie/packages/blob/master/user/qemu/APKBUILD

  
  Without --enable-debug-tcg:

  Thread 5 "qemu-system-i38" received signal SIGSEGV, Segmentation fault.
  [Switching to LWP 14090]
  0x39fb04787f63db78 in ?? ()
  (gdb)
  (gdb) bt
  #0  0x39fb04787f63db78 in  ()
  #1  0x00003ffff1cdb160 in code_gen_buffer ()
  #2  0x0000000100362048 in cpu_tb_exec (itb=<optimized out>, cpu=<optimized 
out>) at /usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:169
  #3  0x0000000100362048 in cpu_loop_exec_tb (tb_exit=<synthetic pointer>, 
last_tb=<synthetic pointer>, tb=<optimized out>, cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:626
  #4  0x0000000100362048 in cpu_exec (cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/accel/tcg/cpu-exec.c:734
  #5  0x00000001003211b4 in tcg_cpu_exec (cpu=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/cpus.c:1362
  #6  0x00000001003211b4 in qemu_tcg_rr_cpu_thread_fn (arg=<optimized out>) at 
/usr/src/packages/user/qemu/src/qemu-2.12.1/cpus.c:1461
  #7  0x00003ffff7fa275c in start (p=0x3fffedb6a810) at 
src/thread/pthread_create.c:147
  #8  0x00003ffff7fae4c8 in __clone () at src/thread/powerpc64/clone.s:43


  With --enable-debug-tcg:

  Assertion failed: disp == (int16_t) disp 
(/usr/src/packages/user/qemu/src/qemu-2.12.1/tcg/ppc/tcg-target.inc.c: 
reloc_pc14_val: 204)
  zsh: abort      qemu-system-i386

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