[Bug 1862986] [NEW] qemu-s390x crashes when run on aarch64

[Bug 1862986] [NEW] qemu-s390x crashes when run on aarch64

[Marco]

Public bug reported:

All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
when run on an aarch64 odroid Ubuntu.


Steps to reproduce:

root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
Segmentation fault (core dumped)
root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
qemu-s390x version 4.2.0
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
Segmentation fault (core dumped)
root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

qemu-arm does work on the same machine:

root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
Running 4 test cases...

*** No errors detected
root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
Running 4 test cases...

*** No errors detected


What kind of debug information would be helpful for this issue report?
GDB for the self-compiled latest release is not particularly helpful:

(gdb) run
Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fb7a2a140 (LWP 28264)]

Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
0x000000555596b218 in __bss_start__ ()
(gdb) bt
#0  0x000000555596b218 in __bss_start__ ()
#1  0x00000055556120a8 in ?? ()
#2  0x00000055579904b0 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)


A bit more information is available in the version shipped by Ubuntu:

(gdb) run
Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fb7a01180 (LWP 28271)]

Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
0x0000005555738f98 in code_gen_buffer ()
(gdb) bt
#0  0x0000005555738f98 in code_gen_buffer ()
#1  0x00000055555e96c8 in cpu_exec ()
#2  0x00000055555ee430 in cpu_loop ()
#3  0x00000055555c3328 in main ()

** Affects: qemu
     Importance: Undecided
         Status: New

** Description changed:

  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.
+ 
  
  Steps to reproduce:
  
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
  
- 
  qemu-arm does work on the same machine:
  
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...
  
  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...
  
  *** No errors detected
  
  
+ 
  What kind of debug information would be helpful for this issue report?
- 
- 
  GDB for the self-compiled latest release is not particularly helpful:
  
  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]
  
  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)
  
+ 
+ 
  A bit more information is available in the version shipped by Ubuntu:
  
  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]
  
  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  New

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Richard Henderson]

You need to provide the test binary.

I can run a chroot of s390x ubuntu bionic on aarch64 just fine,
so it must be something specific to your test.

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

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Marco]

** Attachment added: "A test binary"
   https://bugs.launchpad.net/qemu/+bug/1862986/+attachment/5331331/+files/test_bitcoin_orig

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Marco]

Thanks for taking a look. With the binary I posted, the steps to
reproduce are:

dpkg --add-architecture s390x && apt update && apt install qemu-user
wget libc6:s390x libstdc++6:s390x libfontconfig1:s390x libxcb1:s390x -y
&& wget
https://bugs.launchpad.net/qemu/+bug/1862986/+attachment/5331331/+files/test_bitcoin_orig
&& sha256sum  ./test_bitcoin_orig && chmod +x test_bitcoin_orig

The hash of the file is
193758e2041d49fe90722927ba6b5371506831caf733ee2fe61ef7d61cc894f7 and
qemu-user crashes for me:

$ qemu-s390x ./test_bitcoin_orig
Segmentation fault (core dumped)

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Marco]

** Attachment added: "A smaller test binary that also crashes"
   https://bugs.launchpad.net/qemu/+bug/1862986/+attachment/5331362/+files/hello_world.exe

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Marco]

I can also reproduce this in a debian:sid docker container on x86_64, so
this might not be related to the host CPU architecture

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Laurent Vivier]

Could it be related to https://bugs.launchpad.net/qemu/+bug/1860920 ?

Could you try latest QEMU source (including "target/s390x/translate: Fix
RNSBG instruction")?

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x crashes when run on aarch64

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

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

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Title:
  qemu-s390x crashes when run on aarch64

Status in QEMU:
  Expired

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x segfaults

[Marco]

This still happens on qemu 5.0

Steps to reproduce:

# install packages
dpkg --add-architecture s390x
apt update
apt install qemu-user libc6:s390x libstdc++6:s390x libfontconfig1:s390x libxcb1:s390x
apt install g++-s390x-linux-gnu

# create dummy binary
echo 'int main(){}'| s390x-linux-gnu-g++ -x c++ -

# run dummy binary
qemu-s390x ./a.out
Segmentation fault (core dumped)

** Summary changed:

- qemu-s390x crashes when run on aarch64
+ qemu-s390x segfaults

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

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Title:
  qemu-s390x segfaults

Status in QEMU:
  New

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x segfaults

[Thomas Huth]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.


** Tags added: s390x

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

-- 
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https://bugs.launchpad.net/bugs/1862986

Title:
  qemu-s390x segfaults

Status in QEMU:
  Incomplete

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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[Bug 1862986] Re: qemu-s390x segfaults

[Marco]

Fixed in qemu-s390x version 5.2.0 (Debian 1:5.2+dfsg-10)


** Changed in: qemu
       Status: Incomplete => Fix Released

-- 
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https://bugs.launchpad.net/bugs/1862986

Title:
  qemu-s390x segfaults

Status in QEMU:
  Fix Released

Bug description:
  All tested versions (2.11 and 4.2) qemu-s390x crashes with a segfault
  when run on an aarch64 odroid Ubuntu.


  Steps to reproduce:

  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-s390x --version
  qemu-s390x version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x "/root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig"
  Segmentation fault (core dumped)
  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-s390x --version
  qemu-s390x version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.22)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  qemu-arm does work on the same machine:

  root@odroid:~/workspace/bitcoin-core# /usr/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected
  root@odroid:~/workspace/bitcoin-core# /usr/local/bin/qemu-arm bitcoin-0.19.0.1-armhf/bin/test_bitcoin -t amount_tests
  Running 4 test cases...

  *** No errors detected


  
  What kind of debug information would be helpful for this issue report?
  GDB for the self-compiled latest release is not particularly helpful:

  (gdb) run
  Starting program: /usr/local/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a2a140 (LWP 28264)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x000000555596b218 in __bss_start__ ()
  (gdb) bt
  #0  0x000000555596b218 in __bss_start__ ()
  #1  0x00000055556120a8 in ?? ()
  #2  0x00000055579904b0 in ?? ()
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)


  
  A bit more information is available in the version shipped by Ubuntu:

  (gdb) run
  Starting program: /usr/bin/qemu-s390x /root/workspace/bitcoin-core/build/bitcoin-s390x-linux-gnu/src/test/test_bitcoin_orig
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fb7a01180 (LWP 28271)]

  Thread 1 "qemu-s390x" received signal SIGSEGV, Segmentation fault.
  0x0000005555738f98 in code_gen_buffer ()
  (gdb) bt
  #0  0x0000005555738f98 in code_gen_buffer ()
  #1  0x00000055555e96c8 in cpu_exec ()
  #2  0x00000055555ee430 in cpu_loop ()
  #3  0x00000055555c3328 in main ()

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