This bug is awaiting verification that the linux-nvidia- tegra/6.8.0-1007.7 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-done-noble-linux-nvidia-tegra'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-failed-noble-linux-nvidia-tegra'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-nvidia-tegra-v2 verification-needed-noble-linux-nvidia-tegra -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2106381 Title: nvme/tcp hangs IO on arm Status in linux package in Ubuntu: New Status in linux source package in Noble: In Progress Status in linux source package in Oracular: Fix Released Bug description: [Impact] A user reported a bug in nvme over tcp driver affecting aarch64 architectures. In weakly ordered architectures the compiler can reorder the instructions reading/setting queue->cmd and queue->rcv_state which can lead to dropping IOs and IO hanging. The bug has been fixed upstream in [1], introduced in 6.14. [Test Plan] The bug is reproducible on arm64 architectures. Setup nvme over tcp. Using an arm based machien as the target run a fio test with the following config: [global] ioengine=libaio max_latency=45s end_fsync=1 create_serialize=0 size=3200m directory=/path/to/storage ramp_time=30 lat_percentiles=1 direct=1 filename_format=fiodata.$jobnum verify_dump=1 numjobs=16 fallocate=native stonewall=1 group_reporting=1 file_service_type=random iodepth=16 runtime=5m time_based=1 [random_0_100_4k] bs=4k rw=randwrite [Where problems could occur] To fix the bug the patch reads/writes queue->cmd with READ/WRITE_ONCE statements and queue->rcv_state with smp_load_acquire and smp_store_release. The patch modifies the nvme-tcp driver and therefore any potential regressions regard setups using nvme over tpc. [Other Info] The user is able to reproduce the issue with kernles 5.19(no longer supported), 6.8 and 6.11. For 6.11 Oracular the patch is pulled in as part of upstream stable patchset 2025-04-15, LP #2107437, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107437 [1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/nvme?id=a16f88964c647103dad7743a484b216d488a6352 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2106381/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
