Private bug reported: Description: Enable SNC will show an unexpected dax device.
Steps to repro ------------------- 1. enable SNC, CPU-> SubNumaCluster-> Enable 2. boot to OS 3. "daxctl list" will show an extra dax device and that state is "disable" root@snaprivr20b2h3:/home/user# cat /etc/os-release PRETTY_NAME="Ubuntu 24.04.1 LTS" NAME="Ubuntu" VERSION="24.04.1 LTS (Noble Numbat)" VERSION_ID="24.04" VERSION_CODENAME=noble ID=ubuntu ID_LIKE=debian UBUNTU_CODENAME=noble HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; UBUNTU_CODENAME=noble root@snaprivr20b2h3:/home/user# uname -msr Linux 6.8.0-49-generic x86_64 root@snaprivr20b2h3:/home/user# daxctl list { "chardev": "dax1.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax2.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax3.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax0.0", "size": 549755813888, "target-node": 14, "align": 2097152, "node": "system-ram", "total_memblocks": 256, "movable": false } root@snaprivr20b2h3:/home/user# dmesg | grep -i dax [ 37.125024] kmem dax0: map=0x480000000000-0x4807ffffffff could not reserve region [ 37.125041] kmem dax1: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 55.209871] kmem dax0: map=0x480000000000-0x4807ffffffff could not reserve region [ 55.209891] kmem dax1: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 63.186520] kmem dax2: map=0x480000000000-0x4807ffffffff could not reserve region [ 63.186536] kmem dax3: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 63.680038] dax0.0: Intel(R) Accelerated Device (v200) [ 63.680073] dax1.0: Intel(R) Accelerated Device (v200) [ 63.680106] dax2.0: Intel(R) Accelerated Device (v200) [ 63.680137] dax3.0: Intel(R) Accelerated Device (v200) [ 63.680171] dax0.0: pmem region probe of dax0.0 failed with error -16 [ 63.680171] dax1.0: pmem region probe of dax1.0 failed with error -16 [ 63.680204] dax2.0: pmem region probe of dax2.0 failed with error -16 [ 63.680233] dax3.0: pmem region probe of dax3.0 failed with error -16 [ 55.209913] Built 6 zonelists, mobility grouping on. Total pages: 1189126047 [ 55.364393] Kernel command line: Normal [ 55.506431] x86/cpu: SGX disabled by BIOS [ 55.509821] memory: probe of dax1.0 failed with error -16 [ 55.209876] kmem dax0: map=0x480000000000-0x5007ffffffff could not reserve region root@snaprivr20b2h3:/home/user# ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Information type changed from Public to Private -- 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/2091560 Title: [DELL Ubuntu 24.04] observing [Memory][CXL] Enable SNC will show an unexpected dax device. Status in linux package in Ubuntu: New Bug description: Description: Enable SNC will show an unexpected dax device. Steps to repro ------------------- 1. enable SNC, CPU-> SubNumaCluster-> Enable 2. boot to OS 3. "daxctl list" will show an extra dax device and that state is "disable" root@snaprivr20b2h3:/home/user# cat /etc/os-release PRETTY_NAME="Ubuntu 24.04.1 LTS" NAME="Ubuntu" VERSION="24.04.1 LTS (Noble Numbat)" VERSION_ID="24.04" VERSION_CODENAME=noble ID=ubuntu ID_LIKE=debian UBUNTU_CODENAME=noble HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; UBUNTU_CODENAME=noble root@snaprivr20b2h3:/home/user# uname -msr Linux 6.8.0-49-generic x86_64 root@snaprivr20b2h3:/home/user# daxctl list { "chardev": "dax1.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax2.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax3.0", "size": 549755813888, "target-node": 15, "align": 2097152, "node": "devdax", "state": "disabled" } { "chardev": "dax0.0", "size": 549755813888, "target-node": 14, "align": 2097152, "node": "system-ram", "total_memblocks": 256, "movable": false } root@snaprivr20b2h3:/home/user# dmesg | grep -i dax [ 37.125024] kmem dax0: map=0x480000000000-0x4807ffffffff could not reserve region [ 37.125041] kmem dax1: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 55.209871] kmem dax0: map=0x480000000000-0x4807ffffffff could not reserve region [ 55.209891] kmem dax1: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 63.186520] kmem dax2: map=0x480000000000-0x4807ffffffff could not reserve region [ 63.186536] kmem dax3: map=0x5007ffffffff-0x5007ffffffff could not reserve region [ 63.680038] dax0.0: Intel(R) Accelerated Device (v200) [ 63.680073] dax1.0: Intel(R) Accelerated Device (v200) [ 63.680106] dax2.0: Intel(R) Accelerated Device (v200) [ 63.680137] dax3.0: Intel(R) Accelerated Device (v200) [ 63.680171] dax0.0: pmem region probe of dax0.0 failed with error -16 [ 63.680171] dax1.0: pmem region probe of dax1.0 failed with error -16 [ 63.680204] dax2.0: pmem region probe of dax2.0 failed with error -16 [ 63.680233] dax3.0: pmem region probe of dax3.0 failed with error -16 [ 55.209913] Built 6 zonelists, mobility grouping on. Total pages: 1189126047 [ 55.364393] Kernel command line: Normal [ 55.506431] x86/cpu: SGX disabled by BIOS [ 55.509821] memory: probe of dax1.0 failed with error -16 [ 55.209876] kmem dax0: map=0x480000000000-0x5007ffffffff could not reserve region root@snaprivr20b2h3:/home/user# To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2091560/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
