This bug was fixed in the package klibc - 2.0.7-1ubuntu1
---------------
klibc (2.0.7-1ubuntu1) focal; urgency=low
* Merge from Debian unstable. Remaining changes:
* Fix FTBFS on eoan and later with new gcc
- cf-protection.patch: Disable cf-protection for syscalls stub.
* save-argc.patch: when build with gcc-9 linux-5.3, calling ioctl,
clears global argc, thus save it, to compare to it later. Otheriwse
losetup -f is broken LP: #1850184
klibc (2.0.7-1) unstable; urgency=medium
[ Ben Hutchings ]
* New upstream version:
- klcc: Enable stripping even if CONFIG_DEBUG_INFO is enabled
- run-init: Allow the initramfs to be persisted across root changes
(thanks to Matthew Garrett)
- ipconfig: Implement support -d ...:dns0:dns1 options (Closes: #931416)
- Kbuild: Work around broken "ar s" in binutils 2.32 (see #941921)
* debian/rules: Reorganise make flags variables
* debian/rules: Define ARCH for klibc, for all architectures
* debian/rules: Delete redundant architecture mappings
* debian/rules: Delete redundant export
* klibc-utils: Trigger update-initramfs on install/upgrade
* initramfs-tools: Don't install commands that already exist in /sbin
* initramfs-tools: Exclude kinit and zcat commands earlier
* initramfs-tools: Exclude gzip command
* Drop "resume: Backward compatibility for resume_offset", which will
not be needed in the next release
* [klibc] fstype: Drop obsolete support for "ext4dev" (Closes: #932926)
* debian/control: Set Maintainer to Debian Kernel Team; move maks to
Uploaders
[ James Clarke ]
* debian/control: Restrict m4 build dependency to just sparc
[ Helmut Grohne ]
* Honour DEB_BUILD_OPTIONS=nocheck. (Closes: #922814)
-- Dimitri John Ledkov <x...@ubuntu.com> Thu, 31 Oct 2019 11:50:44
+0000
** Changed in: klibc (Ubuntu Focal)
Status: New => Fix Released
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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:
Fix Released
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:
Fix Released
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
...
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