Fails to include libgcc, resulting in cryptsetup failures

[Chris Halse Rogers]

I recently rebooted my laptop, and couldn't unlock my (cryptsetup-managed) root filesystem; after entering my passphrase, the plymouth prompt would always say “unable to unlock /dev/nvme0n1p3_crypt”.

Dropping to text mode, I can see that cryptsetup is failing with a message like:
"libgcc_s: missing library, needed for pthread_exit”.

Indeed, in the recovery console cryptsetup will immediately crash with that message.

I note that initramfs-tools already has some logic for detecting when libgcc_s is needed but isn't in DT_NEEDED, but this seems to have gone out of date.

Adding an initramfs hook to manually add libgcc_s to the initramfs results in a bootable system again.

I don't reboot this laptop often, so I unfortunately can't narrow down *when* this started failing better than “sometime in the last 2 months”.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: initramfs-tools 0.140ubuntu10
ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
Uname: Linux 5.13.0-20-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu75
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 24 12:08:34 2022
InstallationDate: Installed on 2021-06-26 (211 days ago)
InstallationMedia: Ubuntu 21.10.0 2021.05.28 amd64 "bcachefs" (20210622)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: Upgraded to jammy on 2021-10-28 (87 days ago)