[qemu-xen staging] .travis.yml: skip ppc64abi32-linux-user with plugins

[patchbot@xxxxxxx]

commit 0571d280d057b851e3bb3ea7c350b86c950aea6e
Author:     Alex Bennée <alex.bennee@xxxxxxxxxx>
AuthorDate: Tue Jul 14 18:55:16 2020 +0100
Commit:     Alex Bennée <alex.bennee@xxxxxxxxxx>
CommitDate: Wed Jul 15 11:57:17 2020 +0100

    .travis.yml: skip ppc64abi32-linux-user with plugins
    
    We actually see failures on threadcount running without plugins:
    
      retry.py -n 1000 -c -- \
        ./ppc64abi32-linux-user/qemu-ppc64abi32 \
        ./tests/tcg/ppc64abi32-linux-user/threadcount
    
    which reports:
    
      0: 978 times (97.80%), avg time 0.270 (0.01 varience/0.08 deviation)
      -6: 21 times (2.10%), avg time 0.336 (0.01 varience/0.12 deviation)
      -11: 1 times (0.10%), avg time 0.502 (0.00 varience/0.00 deviation)
      Ran command 1000 times, 978 passes
    
    But when running with plugins we hit the failure a lot more often:
    
      0: 91 times (91.00%), avg time 0.302 (0.04 varience/0.19 deviation)
      -11: 9 times (9.00%), avg time 0.558 (0.01 varience/0.11 deviation)
      Ran command 100 times, 91 passes
    
    The crash occurs in guest code which is the same in both pass and fail
    cases. However we see various messages reported on the console about
    corrupted memory lists which seems to imply the guest memory allocation
    is corrupted. This lines up with the seg fault being in the guest
    __libc_free function. So we think this is a guest bug which is
    exacerbated by various modes of translation. If anyone has access to
    real hardware to soak test the test case we could prove this properly.
    
    Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
    Acked-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
    Tested-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
    Message-Id: <20200714175516.5475-1-alex.bennee@xxxxxxxxxx>
---
 .travis.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index ab429500fc..6695c0620f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -350,9 +350,10 @@ jobs:
     # Run check-tcg against linux-user (with plugins)
     # we skip sparc64-linux-user until it has been fixed somewhat
     # we skip cris-linux-user as it doesn't use the common run loop
+    # we skip ppc64abi32-linux-user as it seems to have a broken libc
     - name: "GCC plugins check-tcg (user)"
       env:
-        - CONFIG="--disable-system --enable-plugins --enable-debug-tcg 
--target-list-exclude=sparc64-linux-user,cris-linux-user"
+        - CONFIG="--disable-system --enable-plugins --enable-debug-tcg 
--target-list-exclude=sparc64-linux-user,cris-linux-user,ppc64abi32-linux-user"
         - TEST_BUILD_CMD="make build-tcg"
         - TEST_CMD="make check-tcg"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-gcc-debug-tcg"
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#staging