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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0ZNSTlXzWZGK3Ivf6f2T5YKG6zbuRI1v/dTknsRFGcBdyjMHQG3quFlGxqbTKJoOB8PjMWiv+WxcNm6qVi6gKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR10MB7857 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-06_01,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510240000 definitions=main-2511060071 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDEzMyBTYWx0ZWRfX1Kob3IJeGkm2 dDuwwHVSRq34mpReO49NApTWhKS9DjBFL+3EtZVUQ+zaICf+Ul9ADrejhjI9O2lWF7QzQl+GviS /UmCsOWLfEWxCJpXB8AXT++Att70Atw4U+Ly3h5PnTSZ12kc9PPXStQA9oehQNA7vF9HqkbwzGi 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You >>>> can check group "atomicwrites" to know which tests they are. >>>> >>>> 774 is the fio test. > > I tried the other "atomicwrites" test. I found g778 took very long time. > I think it implies that g778 may have similar problem as g774. > > g765: [not run] write atomic not supported by this block device > g767: 11s > g768: 13s > g769: 13s > g770: 35s > g773: [not run] write atomic not supported by this block device > g774: did not completed after 3 hours run (and kernel reported the INFO messages) > g775: 48s > g776: [not run] write atomic not supported by this block device > g778: did not completed after 50 minutes run > x838: [not run] External volumes not in use, skipped this test > x839: [not run] XFS error injection requires CONFIG_XFS_DEBUG > x840: [not run] write atomic not supported by this block device This is testing software-based atomic writes, and they are just slow. Very slow, relative to HW-based atomic writes. And having bs=1M will make things worse, as we are locking out other threads for longer (when doing the write). So I think that we should limit the file size which we try to write. > >>>> >>>> Some things to try: >>>> - use a physical disk for the TEST_DEV > > I tried using a real HDD for TEST_DEV, but still observed the hang and INFO > messages at g774. > >>>> - Don't set LOAD_FACTOR (if you were setting it). If not, bodge 774 to >>>> reduce $threads to a low value, say, 2 > > I do not set LOAD_FACTOR. I changed g775 script to set threads=2, then the > test case completed quickly, within a few minutes. I'm suspecting that this > short test time might hide the hang/INFO problem. > >>>> - trying turning on XFS_DEBUG config > > I turned on XFS_DEBUG, and still observed the hang and the INFO messages. > I don't think that this will help. >>>> >>>> BTW, Darrick has posted some xfs atomics fixes @ https://urldefense.com/ >>>> v3/__https://urldefense.com/v3/__https://lore.kernel.org/linux-__;!!ACWV5N9M2RV99hQ!J3HKTWLF8Qx-j42OOJ4o1YAttSSoqOCm9ymJtisUYoOtGgOyNNGqHnjjl1Zd9DQXJvCz8zqPMG-kgeVdo9MQuupMlcAo$ >>>> xfs/20251105001200.GV196370@frogsfrogsfrogs/T/*t__;Iw!!ACWV5N9M2RV99hQ! IuEPY6yJ1ZEQu7dpfjUplkPJucOHMQ9cpPvIC4fiJhTi_X_7ImN0t6wGqxg9_GM6gWe4B1OBiBjEI8Gz_At0595tIQ$ >>>> . I doubt that they will help this, but worth trying. > > I have not yet tried this. Will try it tomorrow. Nor this. Having a hang - even for the conditions set - should not produce a hang. I can check on whether we can improve the software-based atomic writes in xfs to avoid this. Thanks, John