** Description changed: + [Impact] + + * sudo /usr/lib/klibc/bin/losetup -vf, which appears to be missbuilt, as main(argc) is reset to zero, after ioctl() operations in a function call, quite unexpectadly. + + [Test Case] + + * sudo /usr/lib/klibc/bin/losetup -vf + + should not fail, and should print next available free loop device + + [Regression Potential] + + * klibc is quite special, as it uses linux kernel headers/assembly. It + seems like there is incompatibility between klibc sources, and gcc-9 + with linux-5.3 when used to build userspace programmes. + + * disabling cf-protection and stack-clash-protection did not help. + + * building with gcc-8 does not exhibit the problem. + + * the workaround is quite simple in the code, keep a copy of argc to + compare to it later in the code. + + [Other Info] + + * Original bug report + http://autopkgtest.ubuntu.com/packages/c/casper/focal/amd64 https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac /autopkgtest-focal/focal/amd64/c/casper/20191025_214555_df8b8@/log.gz ... [ 11.751912] EXT4-fs (sda1): mounting ext2 file system using the ext4 subsystem [ 11.761441] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null) loop: can't get info on device /dev/loop1: No such device or address - BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) [6n+ mkdir result + set -x + read LINE + grep -e '^--OUT .* BEGIN-- .* --END--$' qemu-output.txt ++ grep -q /rofs result/lsblk.txt grep: result/lsblk.txt: No such file or directory autopkgtest [21:45:45]: test boot: -----------------------] autopkgtest [21:45:45]: test boot: - - - - - - - - - - results - - - - - - - - - - boot FAIL non-zero exit status 2 autopkgtest [21:45:45]: @@@@@@@@@@@@@@@@@@@@ summary boot FAIL non-zero exit status 2 ...
-- 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/1850184 Title: losetup -f broken in 2.0.6-1ubuntu2 Status in gcc-9 package in Ubuntu: New Status in klibc package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in gcc-9 source package in Eoan: New Status in klibc source package in Eoan: New Status in linux source package in Eoan: Incomplete Status in gcc-9 source package in Focal: New Status in klibc source package in Focal: New Status in linux source package in Focal: Incomplete Bug description: [Impact] * sudo /usr/lib/klibc/bin/losetup -vf, which appears to be missbuilt, as main(argc) is reset to zero, after ioctl() operations in a function call, quite unexpectadly. [Test Case] * sudo /usr/lib/klibc/bin/losetup -vf should not fail, and should print next available free loop device [Regression Potential] * klibc is quite special, as it uses linux kernel headers/assembly. It seems like there is incompatibility between klibc sources, and gcc-9 with linux-5.3 when used to build userspace programmes. * disabling cf-protection and stack-clash-protection did not help. * building with gcc-8 does not exhibit the problem. * the workaround is quite simple in the code, keep a copy of argc to compare to it later in the code. [Other Info] * Original bug report http://autopkgtest.ubuntu.com/packages/c/casper/focal/amd64 https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac /autopkgtest-focal/focal/amd64/c/casper/20191025_214555_df8b8@/log.gz ... [ 11.751912] EXT4-fs (sda1): mounting ext2 file system using the ext4 subsystem [ 11.761441] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null) loop: can't get info on device /dev/loop1: No such device or address BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) [6n+ mkdir result + set -x + read LINE + grep -e '^--OUT .* BEGIN-- .* --END--$' qemu-output.txt ++ grep -q /rofs result/lsblk.txt grep: result/lsblk.txt: No such file or directory autopkgtest [21:45:45]: test boot: -----------------------] autopkgtest [21:45:45]: test boot: - - - - - - - - - - results - - - - - - - - - - boot FAIL non-zero exit status 2 autopkgtest [21:45:45]: @@@@@@@@@@@@@@@@@@@@ summary boot FAIL non-zero exit status 2 ... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-9/+bug/1850184/+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
