** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1866882

Title:
  segfault in libllvm-10 when building kernel bpf selftests on s390

Status in linux package in Ubuntu:
  New
Status in llvm-toolchain-10 package in Ubuntu:
  Incomplete

Bug description:
  Seeing this in autopkgtest for the 5.4.0-18 kernel:

    Stack dump:
    0.  Program arguments: llc -march=bpf -mcpu=probe -filetype=obj -o 
/tmp/autopkgtest.92AlD3/build.vya/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/bpf/btf__core_reloc_nesting___err_array_container.o
 
    #0 0x000003ff830ab14a (/lib/s390x-linux-gnu/libLLVM-10.so.1+0x9ab14a)
    Segmentation fault (core dumped)

  Full log:
  
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-focal/focal/s390x/l/linux/20200310_180956_146bd@/log.gz

  This did not happen for the 5.4.0-17 upload with llvm-9, with no
  changes to the bpf program being compiled when the segfault happens
  between the -17 and -18 uploads.

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