This is non stripped and only 112 lines of C

./36-sim-ipc_syscalls: ELF 64-bit MSB pie executable, IBM S/390, version
1 (SYSV), dynamically linked, interpreter /lib/ld64.so.1,
BuildID[sha1]=15c4946540be396acecc4273529e252eceff398f, for GNU/Linux
3.2.0, with debug_info, not stripped

wc -l 36-sim-ipc_syscalls.c
112 36-sim-ipc_syscalls.c

That should be debuggable I guess ...

Re-Build without optimization:
# gcc -DHAVE_CONFIG_H -I. -I..  -I../include -Wdate-time -D_FORTIFY_SOURCE=2 
-Wall -g -O0 -fdebug-prefix-map=/root/libseccomp-2.4.1=. 
-fstack-protector-strong -Wformat -Werror=format-security -c -o 
36-sim-ipc_syscalls.o 36-sim-ipc_syscalls.c
# gcc -Wall -g -O0 -fdebug-prefix-map=/root/libseccomp-2.4.1=. 
-fstack-protector-strong -Wformat -Werror=format-security 
-Wl,-Bsymbolic-functions -Wl,-z -Wl,relro -o 36-sim-ipc_syscalls 
36-sim-ipc_syscalls.o  -lpthread ./.libs/util.a ../src/.libs/libseccomp.a

Install gdb and check what might be going on ...

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https://bugs.launchpad.net/bugs/1849785

Title:
  FTBFS on i386/ppc64/s390x (Eoan+Focal)

Status in libseccomp package in Ubuntu:
  Confirmed
Status in libseccomp source package in Eoan:
  Confirmed

Bug description:
  Due to the python 3.8 transition in focal this was rebuilt but fails atm.
  => 
https://launchpadlibrarian.net/448119198/buildlog_ubuntu-focal-s390x.libseccomp_2.4.1-0ubuntu0.19.10.4_BUILDING.txt.gz

  The simulations fail in this case:
   batch name: 36-sim-ipc_syscalls
   test mode:  c
   test type:  bpf-sim
  Test 36-sim-ipc_syscalls%%001-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%002-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%003-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%004-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%005-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%006-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%007-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%008-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%009-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%010-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%011-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%012-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%013-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%014-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%015-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%016-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%017-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%018-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%019-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%020-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%021-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%022-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%023-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
  Test 36-sim-ipc_syscalls%%024-00001 result:   ERROR 36-sim-ipc_syscalls rc=14
   test mode:  c
   test type:  bpf-valgrind
  Test 36-sim-ipc_syscalls%%025-00001 result:   FAILURE 36-sim-ipc_syscalls 
rc=14
   batch name: 37-sim-ipc_syscalls_be
   test mode:  c
   test type:  bpf-sim
   test arch:  s390

  
   batch name: 37-sim-ipc_syscalls_be
   test mode:  c
   test type:  bpf-sim
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%001-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%002-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%003-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%004-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%005-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%006-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%007-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%008-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%009-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%010-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%011-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test arch:  s390
  Test 37-sim-ipc_syscalls_be%%012-00001 result:   ERROR 37-sim-ipc_syscalls_be 
rc=14
   test mode:  c
   test type:  bpf-valgrind
  Test 37-sim-ipc_syscalls_be%%013-00001 result:   FAILURE 
37-sim-ipc_syscalls_be rc=14

  
  It is always the s390x test - even when running on i386/ppc64
  On x86_64 this test succeeds:

  Test 36-sim-ipc_syscalls%%025-00001 result:   SUCCESS
   batch name: 37-sim-ipc_syscalls_be
   test mode:  c
   test type:  bpf-sim
   test arch:  s390

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