That leads to https://autobuilder.yocto.io/pub/non-release/20200321-1/testresults/qemuarm64-ptest-fast/testresults.json
which has the log:

PASS: one.test
[patch-wrapper.test]
[1] $ mkdir somewhere -- ok
[3] $ cat > foo.orig -- ok
[9] $ sed -e 's/3/3a/' foo.orig > foo -- ok
[10] $ diff -u foo.orig foo > foo.diff -- ok
[11] $ mv foo.orig foo -- ok
[13] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[14] $ patch-wrapper -s -p0 < foo.diff -- ok
[15] $ quilt pop -q -- ok
[18] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[20] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[21] $ patch-wrapper --backup -B xxx/ -s -p0 < foo.diff -- ok
[22] $ find xxx -type f -- ok
[24] $ quilt pop -q -- ok
[27] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[29] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[30] $ patch-wrapper -s -p0 -i foo.diff -- ok
[31] $ quilt pop -q -- ok
[34] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[36] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[37] $ patch-wrapper -p0 < foo.diff -- ok
[39] $ quilt pop -q -- ok
[42] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[44] $ mv foo.diff somewhere/ -- ok
[45] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[46] $ patch-wrapper -p0 < somewhere/foo.diff -- ok
[48] $ quilt pop -q -- ok
[51] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[53] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[54] $ patch-wrapper -p0 -i somewhere/foo.diff -- ok
[56] $ quilt pop -q -- ok
[59] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
[61] $ sed -e 's/5/5b/' foo > foo.new -- ok
[62] $ mv foo.new foo -- ok
[63] $ mkdir ${QUILT_PATCHES:-patches} -- ok
[64] $ patch-wrapper -p0 < somewhere/foo.diff -- failed
patching file foo                     == patching file foo
ln: failed to access '.pc/somewhere/foo.diff/foo': No such file or directory != Hunk #1 succeeded at 1 with fuzz 1.
Hunk #1 succeeded at 1 with fuzz 1.   != ~
[67] $ cat foo.orig -- failed
cat: foo.orig: No such file or directory != 1
~                                     != 
~                                     != 3
~                                     != 
~                                     != 5b
[73] $ quilt pop -q -- ok
[76] $ rm -rf ${QUILT_PATCHES:-patches} ${QUILT_PC:-.pc} -- ok
38 commands (36 passed, 2 failed)
make: *** [Makefile:10: check-patch-wrapper] Error 2
FAIL: patch-wrapper.test

This test shouldn't be run at all, as it is included only when --with-patch-wrapper is supplied to ./configure. I sent a patch to match the upstream behaviour.

Alexander Kanavin: did you work on this bug? I just got assigned as it was marked as "unassigned".

I didn't get to the bottom of why the test fails intermittently. What  I did was:

1. Made a patch to disable the test (which should not be merged yet, as the intermittent nature of the failure means there might be a deeper issue)

2. Ran -c testimage core-image-sato-ptest-fast three times, all fully passed :-/

Since it seems lke the patch https://patchwork.openembedded.org/patch/171262/ is not yet merged, I'll be moving it to 3.2

Joe, Sakib has a few bugs so could you work on this one?

This issue happanded again:

https://autobuilder.yoctoproject.org/typhoon/#/builders/82/builds/1500/steps/12/log
s/stdio

WARNING: core-image-sato-sdk-ptest-1.0-r0 do_testimage: There were failing ptests.
Traceback (most recent call last):
  File "/home/pokybuild/yocto-worker/qemuarm64-ptest/build/meta/lib/oeqa/core/decorator/__init__.py", line 36, in wrapped_f
    return func(*args, **kwargs)
  File "/home/pokybuild/yocto-worker/qemuarm64-ptest/build/meta/lib/oeqa/core/decorator/__init__.py", line 36, in wrapped_f
    return func(*args, **kwargs)
  File "/home/pokybuild/yocto-worker/qemuarm64-ptest/build/meta/lib/oeqa/core/decorator/__init__.py", line 36, in wrapped_f
    return func(*args, **kwargs)
  File "/home/pokybuild/yocto-worker/qemuarm64-ptest/build/meta/lib/oeqa/runtime/cases/ptest.py", line 25, in test_ptestrunner_expectfail
    self.do_ptestrunner()
  File "/home/pokybuild/yocto-worker/qemuarm64-ptest/build/meta/lib/oeqa/runtime/cases/ptest.py", line 112, in do_ptestrunner
    self.fail(failmsg)
AssertionError: Failed ptests:
{'libinput': ['libinput-test-suite'], 'quilt': ['patch-wrapper.test']}

And I think that it also related with https://bugzilla.yoctoproject.org/show_bug.cgi?id=14164

Could not reproduce on qemuarm64

Might be because of filesystem filling up.
I will try running all testsuite

since i have trouble reproducing, the problem is not in quilt.
The autobuilder ptest seems to always fail, each time with a different one
the usual culprits are tcl, libevent and quilt

Investigating if they have any similarities might be helpful

not seen recently and cannot reproduce locally...