This bug is awaiting verification that the 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- xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed- xenial'.
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: verification-needed-xenial -- 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/1834310 Title: Handle overflow for file-max Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: Fix Released Status in linux source package in Cosmic: Fix Committed Bug description: == SRU Justification == Currently, when writing 2^64-1 or 2^63 into file-max: echo 18446744073709551616 > /proc/sys/fs/file-max Will make the system stuck with "Too many open files in system" error within seconds. The upper and lower limit need to be defined properly to avoid this. (The case for passing 2^64 will be addressed in bug 1833935) This failure was reported by the case 2 and 3 of the sysctl02 test in LTP: sysctl02 2 TFAIL: /proc/sys/fs/file-max overflows and set to 18446744073709551615 sysctl02 3 TFAIL: /proc/sys/fs/file-max overflows and set to 9223372036854775808 == Fix == * 32a5ad9c sysctl: handle overflow for file-max * 9002b214 kernel/sysctl.c: fix out-of-bounds access when setting file-max These patches can be cherry-picked into B/C. They have already been applied in X/D from stable update process. == Test == Test kernel could be found here: https://people.canonical.com/~phlin/kernel/lp-1834310-file-max/ Tested OK on KVM nodes with the following command (extracted from the sysctl02 test case in LTP): $ cat /proc/sys/fs/file-max $ sudo sysctl -w -q fs.file-max=18446744073709551615 $ cat /proc/sys/fs/file-max $ sudo sysctl -w -q fs.file-max=9223372036854775808 $ cat /proc/sys/fs/file-max All three file-max output should be identical with the patched kernel. This is because the file-max value is parsed via __do_proc_doulongvec_minmax(), which does not report error when min or max are exceeded but it will just keep the old value instead. == Regression Potential == Low, just adding boundaries to the file-max. And it's been applied in some of our kernels for a while. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-52-generic 4.15.0-52.56 ProcVersionSignature: User Name 4.15.0-52.56-generic 4.15.18 Uname: Linux 4.15.0-52-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Jun 25 11:03 seq crw-rw---- 1 root audio 116, 33 Jun 25 11:03 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.6 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Tue Jun 25 11:04:55 2019 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: QEMU Standard PC (i440FX + PIIX, 1996) PciMultimedia: ProcFB: 0 cirrusdrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-52-generic root=UUID=6f08d1c2-d443-47ee-97ca-2aeb1bf53f35 ro RelatedPackageVersions: linux-restricted-modules-4.15.0-52-generic N/A linux-backports-modules-4.15.0-52-generic N/A linux-firmware 1.173.6 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: Ubuntu-1.8.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-xenial dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-xenial dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834310/+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
