On 09/09/2025 09.48, Richard Henderson wrote:
On 9/8/25 10:12, Thomas Huth wrote:
On 05/09/2025 12.26, Richard Henderson wrote:
Hi guys,
This test has been failing on my laptop for a few weeks.
Any idea why?
FWIW, the test still works for me (after enabling it with "ulimit -l
2097152").
There's nothing logged in tests/functional/x86_64/test_memlock*/*,
which itself seems like a bug.
Is there maybe any hint in meson-logs/testlog-thorough.txt instead?
Ah, yes, there it is:
TAP version 13
not ok 1 test_memlock.MemlockTest.test_memlock_off
ok 2 test_memlock.MemlockTest.test_memlock_on
ok 3 test_memlock.MemlockTest.test_memlock_onfault
1..3
----------------------------------- stderr -----------------------------------
/home/rth/qemu/src/python/qemu/qmp/legacy.py:89: DeprecationWarning: There
is no current event loop
self._aloop = asyncio.get_event_loop()
Traceback (most recent call last):
File "/home/rth/qemu/src/tests/functional/x86_64/test_memlock.py", line
40, in test_memlock_off
self.assertTrue(status['VmLck'] == 0)
AssertionError: False is not true
So it seems there's some non-zero amount of memory locked in the process,
likely nothing to do with what we're trying to test, but we're asserting
anyway.
Digging into /proc/pic/smaps, I have:
79d7d3547000-79d7d354b000 rw-p 00000000 00:00 0
Size: 16 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Rss: 16 kB
Pss: 16 kB
Pss_Dirty: 16 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 16 kB
Referenced: 16 kB
Anonymous: 16 kB
KSM: 0 kB
LazyFree: 0 kB
AnonHugePages: 0 kB
ShmemPmdMapped: 0 kB
FilePmdMapped: 0 kB
Shared_Hugetlb: 0 kB
Private_Hugetlb: 0 kB
Swap: 0 kB
SwapPss: 0 kB
Locked: 16 kB
THPeligible: 0
ProtectionKey: 0
VmFlags: rd wr mr mw me lo ac sd
It's not labeled in /proc/pid/maps, so without more work I don't know where
it comes from, but *something* in my system libraries has asked for 4 pages
of locked memory.
Ok, then the easiest fix is likely to allow some few locked pages in that
assert statement? Care to send a patch?
Thomas
