I'd like to perform a bisect to figure out what commit caused this regression. We need to identify the earliest kernel where the issue started happening as well as the last kernel that did not have this issue.
Can you test the following kernels and report back? Ubuntu 4.15.0-20 was based on the 4.15.17 updates. Ubuntu 4.15.0-23 and newer have the upstream 4.15.18 updates. Testing these two kernels will tell us if the offending commit came in with the 4.15.18 upstream stable updates or if it's specific to Ubuntu: 4.15.17 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.17/ 4.15.18 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.18/ Thanks in advance! -- 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/1799237 Title: mprotect fails on ext4 with dax Status in Ubuntu: Invalid Status in linux package in Ubuntu: Confirmed Status in pmdk package in Ubuntu: Invalid Status in linux source package in Bionic: Confirmed Bug description: I have a file located on ext4 mounted with "dax". When I call mmap on that file with protection flag different than PROT_NONE and pass the returned address to mprotect(..., PROT_NONE) it fails with: mprotect: Permission denied This bug affects PMDK (https://github.com/pmem/pmdk) and seems to be Ubuntu kernel-specific. Problem was observer on kernel 4.15.0-36-generic and 4.15.0-34-generic Below is a code which can be used to reproduce the issue. #include <sys/stat.h> #include <sys/types.h> #include <sys/mman.h> #include <stdlib.h> #include <stdio.h> #include <fcntl.h> int main(int argc, char *argv[]) { if (argc < 3) { fprintf(stderr, "usage %s file size\n", argv[0]); return 1; } int size = atoi(argv[2]); int fd = open(argv[1], O_RDWR); if (fd < 0) { perror("open"); return 1; } void *addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (addr == MAP_FAILED) { perror("mmap"); return 1; } if(mprotect(addr, size, PROT_NONE)) { perror("mprotect"); return 1; } return 0; } --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.4 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2018-10-23 (0 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IwConfig: lo no wireless extensions. enp0s3 no wireless extensions. Lsusb: Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: innotek GmbH VirtualBox Package: linux (not installed) ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=48e87c4c-3028-4252-b7bb-e1e6091ff7f6 ro quiet splash ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-36-generic N/A linux-backports-modules-4.15.0-36-generic N/A linux-firmware 1.173.1 RfKill: Tags: bionic Uname: Linux 4.15.0-36-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 12/01/2006 dmi.bios.vendor: innotek GmbH dmi.bios.version: VirtualBox dmi.board.name: VirtualBox dmi.board.vendor: Oracle Corporation dmi.board.version: 1.2 dmi.chassis.type: 1 dmi.chassis.vendor: Oracle Corporation dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: dmi.product.family: Virtual Machine dmi.product.name: VirtualBox dmi.product.version: 1.2 dmi.sys.vendor: innotek GmbH To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1799237/+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
