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a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=R_GEPjdYq2UwvLfODqYA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12101 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA2MDEzMyBTYWx0ZWRfX4+AHewWz+etx wYy8BS6QbaJV4sBFS/oHUx+PBVlE0ERngRXqgdf6c+anG0nv9xwV9osAEc9uHcv2Sd5hB+zpTrF qxpQNVVWaXBp811BOIpTnH1yJO42uS++UlTOl59GPzmReinh7CP7dMWSfBed5l4dYxmVmXHDKBq 9+M5P06yJ7MckO7j0JOZUtWoTpU1AuE3gj11FXv1FxghnCYjxQuRabj28Lcbq84vmF4CgZPVdXS c/disgCeuxM70LLGOBVgdXn4jfyPKDtn1B5Yg2RdEEld8G1HOypQVs8j/A/SfweHOMsofY+AVcP uG3akUIXrt1g6HkTN1Lq3tnZNHtiarNYqMTa/JIE3Du6N5nb76/u/2U9tbOLhGDyQttPW263lHD BfkAa9tM3oAvnYR+JOPILqkkfFnOJZ9VCNAYCw5tKXdK788Da+0= X-Proofpoint-ORIG-GUID: hdCCSjM3dahjfXHcjCbi3Y0ftZB86XVk X-Proofpoint-GUID: hdCCSjM3dahjfXHcjCbi3Y0ftZB86XVk On 07/11/2025 05:53, Shinichiro Kawasaki wrote: > On Nov 06, 2025 / 20:28, Darrick J. Wong wrote: >> On Fri, Nov 07, 2025 at 02:27:50AM +0000, Shinichiro Kawasaki wrote: >>> On Nov 06, 2025 / 08:53, John Garry wrote: > ... >>>> 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. Will sysrq-t output help? If it helps, I can take it from the hanging >>> test node and share. >> >> Yes, anything you can share would be helpful. > > Okay, I attached dmesg log file (dmesg.gz), which contains the INFO messages and > the sysrq-t output. It was taken with v6.18-rc4 kernel with the fix patches by > Darrick. I also attached the kernel config (_config.gz) which I used to build > the test target kernel. > >> FWIW the test runs in 51 >> seconds here, but I only have 4 CPUs in the VM and fast storage so its >> filesize is "only" 800MB. > > FYI, my test node has 24 CPUs. The hang is sporadic and I needed to repeat the > test case a few times to recreate it with the 8GiB TCMU devices. When it does > not hang, the test case takes about an hour to complete. Hi Shinichiro, Can you still stop the test with ctrl^C, right? @Darrick, I worry that there is too much ip lock contention in xfs_atomic_write_cow_iomap_begin(), especially since we may drop and re-acquire the lock (in xfs_trans_alloc_inode()). Maybe we should force serialization in xfs_file_dio_write_atomic(). After all, this was not intended to provide good performance. Or look at other ways to optimise this (if we do want good performance). Thanks, John