The testcase here doesn't seem to be working (or, rather, failing) for me, which makes it harder to investigate this. It passes on both sid and eoan for me:
(sid-amd64)root@nosferatu:~# dpkg -l \*klibc\* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-============-============-=============================================== ii klibc-utils 2.0.7-1 amd64 small utilities built with klibc for early boot ii libklibc:amd64 2.0.7-1 amd64 minimal libc subset for use with initramfs (sid-amd64)root@nosferatu:~# /usr/lib/klibc/bin/losetup -vf Loop device is /dev/loop0 /dev/loop0 (sid-amd64)root@nosferatu:~# (eoan-amd64)root@nosferatu:~# dpkg -l \*klibc\* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-==============-============-=============================================== ii klibc-utils 2.0.6-1ubuntu2 amd64 small utilities built with klibc for early boot ii libklibc:amd64 2.0.6-1ubuntu2 amd64 minimal libc subset for use with initramfs (eoan-amd64)root@nosferatu:~# /usr/lib/klibc/bin/losetup -vf Loop device is /dev/loop0 /dev/loop0 (eoan-amd64)root@nosferatu:~# -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to klibc 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 Loop device is /dev/loop20 loop: can't get info on device /dev/loop20: No such device or address is bad. Note that ioctl() must succeed, thus loop0 device must be configured to trigger the bug. [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/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
