[Qemu-devel] [Bug 1821430] [NEW] qemu-user-arm (4.0.0-rc0) crashes

[asavah]

Public bug reported:

I'm using qemu-user-arm for crosscompilation needs, usually via a wrapper.
qemu-user-arm (4.0.0-rc0) crashes with SIGILL on at least 2 instructions:

first case (sadly I don't have more data handy, can reproduce at a later time 
if needed):
(gdb) x/i $pc
=> 0xfffce314:  vseleq.f64      d0, d17, d0

second case (llvm-config):
qemu cmdline:
qemu-arm -strace -cpu max -r 5.0.0 -L /home/asavah/kross/build/rpi3/rootfs -E 
LD_LIBRARY_PATH=/home/asavah/kross/build/rpi3/rootfs/usr/bin:/home/asavah/kross/build/rpi3/rootfs/usr/lib
 /home/asavah/kross/build/rpi3/rootfs/usr/bin/llvm-config --shared-mode

--- SIGILL {si_signo=SIGILL, si_code=2, si_addr=0xf9f89f80} ---
qemu: uncaught target signal 4 (Illegal instruction) - core dumped

output from gdb(arm) attached to qemu-user-arm
Program received signal SIGILL, Illegal instruction.
0xf9f77f80 in ?? ()
(gdb) bt
#0  0xf9f77f80 in ?? ()
#1  0xfffd796c in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)  x/i $pc
=> 0xf9f77f80:  vrintm.f64      d18, d18


The very same binaries when run with qemu-user-arm 3.1.0 (both from ubuntu 
19.04 package and self built)
work flawlessly.

This is clearly a regression.
Please fix before releasing 4.0.0.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1821430

Title:
  qemu-user-arm (4.0.0-rc0) crashes

Status in QEMU:
  New

Bug description:
  I'm using qemu-user-arm for crosscompilation needs, usually via a wrapper.
  qemu-user-arm (4.0.0-rc0) crashes with SIGILL on at least 2 instructions:

  first case (sadly I don't have more data handy, can reproduce at a later time 
if needed):
  (gdb) x/i $pc
  => 0xfffce314:  vseleq.f64      d0, d17, d0

  second case (llvm-config):
  qemu cmdline:
  qemu-arm -strace -cpu max -r 5.0.0 -L /home/asavah/kross/build/rpi3/rootfs -E 
LD_LIBRARY_PATH=/home/asavah/kross/build/rpi3/rootfs/usr/bin:/home/asavah/kross/build/rpi3/rootfs/usr/lib
 /home/asavah/kross/build/rpi3/rootfs/usr/bin/llvm-config --shared-mode

  --- SIGILL {si_signo=SIGILL, si_code=2, si_addr=0xf9f89f80} ---
  qemu: uncaught target signal 4 (Illegal instruction) - core dumped

  output from gdb(arm) attached to qemu-user-arm
  Program received signal SIGILL, Illegal instruction.
  0xf9f77f80 in ?? ()
  (gdb) bt
  #0  0xf9f77f80 in ?? ()
  #1  0xfffd796c in ?? ()
  Backtrace stopped: previous frame identical to this frame (corrupt stack?)
  (gdb)  x/i $pc
  => 0xf9f77f80:  vrintm.f64      d18, d18

  
  The very same binaries when run with qemu-user-arm 3.1.0 (both from ubuntu 
19.04 package and self built)
  work flawlessly.

  This is clearly a regression.
  Please fix before releasing 4.0.0.

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