[Bug 1856837] Re: qemu 4.2.0 arm segmentation fault with gcc 9.2

[Thomas Huth <1856837@bugs.launchpad.net>]

The QEMU project is currently considering to move its bug tracking to
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and which could be closed already. Thus we are setting older bugs to
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Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1856837

Title:
  qemu 4.2.0 arm  segmentation fault with gcc 9.2

Status in QEMU:
  Incomplete

Bug description:
  As discussed with f4bug yesterday on IRC here comes the bug
  description.

  I'm building/configured qemu-4.2.0 on an x86_64 (gcc (Debian
  6.3.0-18+deb9u1) 6.3.0 20170516) with target-list "arm-softmmu,arm-
  linux-user" and debug enabled. I use the arm-linux-user variant,
  "qemu-arm".

  Then i'm trying to cross-compile (arm gcc) an old version of googles
  v8 (as i need this version of the lib for binary compatibility) which
  uses qemu during build.

  It worked with gcc 5.4.0 but not with 9.2.0. I also tried with 6.5.0,
  7.4.0 and 8.3.0 but those are also causing the same segmentation
  fault.

  The executed command wich breaks qemu is:

   qemu-arm /tmp/build/out/arm.release/mksnapshot.arm --log-snapshot-
  positions --logfile
  /tmp/build/out/arm.release/obj.host/v8_snapshot/geni/snapshot.log
  --random-seed 314159265 /tmp/build/out/arm.release/obj.host/v8_snap

  The printed error message is:

  ARMv7=1 VFP3=1 VFP32DREGS=1 NEON=0 SUDIV=0 UNALIGNED_ACCESSES=1 MOVW_MOVT_IMMEDIATE_LOADS=0 USE_EABI_HARDFLOAT=1
  qemu: uncaught target signal 11 (Segmentation fault) - core dumped

  Calling qemu with gdb gives the following information:

   Thread 1 "qemu-arm" received signal SIGSEGV, Segmentation fault.
   0x0000555555d63d11 in static_code_gen_buffer ()

  and

   (gdb) bt
   #0  0x0000555555d63d11 in static_code_gen_buffer ()
   #1  0x0000555555628d58 in cpu_tb_exec (itb=<optimized out>, cpu=0x555557c33930) at 
   /tmp/build/qemu/accel/tcg/cpu-exec.c:172
   #2  cpu_loop_exec_tb (tb_exit=<synthetic pointer>, last_tb=<synthetic pointer>, tb=<optimized out>, 
   cpu=0x555557c33930) at /tmp/build/qemu/accel/tcg/cpu-exec.c:618
   #3  cpu_exec (cpu=cpu@entry=0x555557c2b660) at /tmp/build/qemu/accel/tcg/cpu-exec.c:731
   #4  0x0000555555661578 in cpu_loop (env=0x555557c33930) at /tmp/build/qemu/linux-user/arm/cpu_loop.c:219
  #5  0x00005555555d6d76 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /tmp/build/qemu/linux-user/main.c:865

  Calling qemu-arm with debug switch "-d in_asm,int,op_opt" shows the
  log in the attached file.

  Thanks for any hints!
  Fabian

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