Parser test suite fails on mips64el: Failed setting up policy cache (/tmp/aa-caching-l8pvywl8/cache): Operation not supported

eller% strace ../apparmor_parser --debug --base /tmp/aa-caching-_5sxbkdo --skip-kernel-load -M ./features_files/features.all --cache-loc /tmp/aa-caching-_5sxbkdo/aa-alt-cache8eia9fdh --write-cache -r /tmp/aa-caching-_5sxbkdo/sbin.pingy
execve("../apparmor_parser", ["../apparmor_parser", "--debug", "--base", "/tmp/aa-caching-_5sxbkdo", "--skip-kernel-load", "-M", "./features_files/features.all", "--cache-loc", "/tmp/aa-caching-_5sxbkdo/aa-alt-"..., "--write-cache", "-r", "/tmp/aa-caching-_5sxbkdo/sbin.pi"...], [/* 18 vars */]) = 0
brk(NULL) = 0xaab9436000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffebe05000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=15753, ...}) = 0
mmap(NULL, 15753, PROT_READ, MAP_PRIVATE, 3, 0) = 0xffebe01000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/mips64el-linux-gnuabi64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\360\204\0\0\0\0\0\0"..., 832) = 832
lseek(3, 8944, SEEK_SET) = 8944
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\257\374\36\345\304\3317$\252{-7u(9\330"..., 36) = 36
lseek(3, 9608, SEEK_SET) = 9608
read(3, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\3\0\0\0\2\0\0\0\0\0\0\0", 32) = 32
fstat(3, {st_mode=S_IFREG|0755, st_size=169816, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffebdff000
mmap(NULL, 206600, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xffebda1000
mprotect(0xffebdbf000, 61440, PROT_NONE) = 0
mmap(0xffebdce000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1d000) = 0xffebdce000
mmap(0xffebdd0000, 14088, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffebdd0000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/mips64el-linux-gnuabi64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\200\262\0\0\0\0\0\0"..., 832) = 832
lseek(3, 19016, SEEK_SET) = 19016
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0-0\327W\10\270`\223m\214\204\374!\237W\236"..., 36) = 36
lseek(3, 19648, SEEK_SET) = 19648
read(3, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\3\0\0\0\2\0\0\0\0\0\0\0", 32) = 32
fstat(3, {st_mode=S_IFREG|0644, st_size=849872, ...}) = 0
mmap(NULL, 895920, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xffebcc6000
mprotect(0xffebd90000, 61440, PROT_NONE) = 0
mmap(0xffebd9f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc9000) = 0xffebd9f000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/mips64el-linux-gnuabi64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\230\310\3\...

A quick observation is that the strace output doesn't show any syscalls failing with -EOPNOTSUPP.

Built the library with --enable-debug-output and set LIBAPPARMOR_DEBUG=1:

======================================================================
FAIL: test_cache_when_requested (__main__.AAParserBasicCachingTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/intrigeri/apparmor-2.11.0/parser/tst/testlib.py", line 50, in new_unittest_func
    return unittest_func(self)
  File "./caching.py", line 149, in test_cache_when_requested
    self.run_cmd_check(cmd)
  File "/home/intrigeri/apparmor-2.11.0/parser/tst/testlib.py", line 73, in run_cmd_check
    self.assertEqual(rc, expected_rc, "Got return code %d, expected %d\nCommand run: %s\nOutput: %s" % (rc, expected_rc, (' '.join(command)), report))
AssertionError: 1 != 0 : Got return code 1, expected 0
Command run: ../apparmor_parser --base /tmp/aa-caching-qjd0b2ml --skip-kernel-load -M ./features_files/features.all -q --write-cache -r /tmp/aa-caching-qjd0b2ml/sbin.pingy
Output: libapparmor: Opened features "./features_files/features.all"
Failed setting up policy cache (/tmp/aa-caching-qjd0b2ml/cache): Operation not supported

Thanks for rebuilding with debug output! Could you apply this patch and then rebuild once again with debug output? Then run the command by hand and include the output? Thank you!

This turned out to be a miscompilation bug in the mips64el toolchain and not a bug in AppArmor.