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https://bugs.launchpad.net/bugs/1978079
Title:
EFI pstore not cleared on boot
Status in systemd package in Ubuntu:
In Progress
Bug description:
Systemd has a systemd-pstore component that scans the pstore on boot
and if non-empty, takes all previously created dumps, transfers them
into its journal and removes the pstore elements. This is very
important on UEFI systems, which only have a limited amount of space
for variables.
In Ubuntu, the kernel is configured with CONFIG_EFI_VARS_PSTORE=m
which means the EFI pstore support gets loaded dynamically. In all of
my boots, this dynamic module loading happened *after* systemd tried
to check for pstore variables. So systemd-pstore never starts and
never clears the UEFI variable store. I see this happening in AWS on
Graviton instances, which eventually run out of space to store the
dumps. On real hardware, this behavior may lead to unbootable systems.
```
$ systemctl status systemd-pstore
○ systemd-pstore.service - Platform Persistent Storage Archival
Loaded: loaded (/lib/systemd/system/systemd-pstore.service; enabled;
vendor preset: enabled)
Active: inactive (dead)
Condition: start condition failed at Thu 2022-06-09 09:11:41 UTC; 29min ago
└─ ConditionDirectoryNotEmpty=/sys/fs/pstore was not met
Docs: man:systemd-pstore(8)
Jun 09 09:11:41 ip-172-31-0-61 systemd[1]: Condition check resulted in
Platform Persistent Storage Archival being skipped.
$ ls -la /sys/fs/pstore
total 0
drwxr-x--- 2 root root 0 Jun 9 09:11 .
drwxr-xr-x 8 root root 0 Jun 9 09:11 ..
-r--r--r-- 1 root root 1803 Jun 9 09:07 dmesg-efi-165476562001001
-r--r--r-- 1 root root 1777 Jun 9 09:07 dmesg-efi-165476562002001
-r--r--r-- 1 root root 1773 Jun 9 09:07 dmesg-efi-165476562003001
-r--r--r-- 1 root root 1815 Jun 9 09:07 dmesg-efi-165476562004001
-r--r--r-- 1 root root 1826 Jun 9 09:07 dmesg-efi-165476562005001
-r--r--r-- 1 root root 1754 Jun 9 09:07 dmesg-efi-165476562006001
-r--r--r-- 1 root root 1821 Jun 9 09:07 dmesg-efi-165476562007001
-r--r--r-- 1 root root 1767 Jun 9 09:07 dmesg-efi-165476562008001
-r--r--r-- 1 root root 1729 Jun 9 09:07 dmesg-efi-165476562009001
-r--r--r-- 1 root root 1819 Jun 9 09:07 dmesg-efi-165476562010001
-r--r--r-- 1 root root 1767 Jun 9 09:07 dmesg-efi-165476562011001
-r--r--r-- 1 root root 1775 Jun 9 09:07 dmesg-efi-165476562012001
-r--r--r-- 1 root root 1802 Jun 9 09:07 dmesg-efi-165476562013001
-r--r--r-- 1 root root 1812 Jun 9 09:07 dmesg-efi-165476562014001
-r--r--r-- 1 root root 1764 Jun 9 09:07 dmesg-efi-165476562015001
-r--r--r-- 1 root root 1795 Jun 9 09:11 dmesg-efi-165476589801001
-r--r--r-- 1 root root 1785 Jun 9 09:11 dmesg-efi-165476589802001
-r--r--r-- 1 root root 1683 Jun 9 09:11 dmesg-efi-165476589803001
-r--r--r-- 1 root root 1785 Jun 9 09:11 dmesg-efi-165476589804001
-r--r--r-- 1 root root 1771 Jun 9 09:11 dmesg-efi-165476589805001
-r--r--r-- 1 root root 1797 Jun 9 09:11 dmesg-efi-165476589806001
-r--r--r-- 1 root root 1805 Jun 9 09:11 dmesg-efi-165476589807001
-r--r--r-- 1 root root 1781 Jun 9 09:11 dmesg-efi-165476589808001
-r--r--r-- 1 root root 1806 Jun 9 09:11 dmesg-efi-165476589809001
-r--r--r-- 1 root root 1821 Jun 9 09:11 dmesg-efi-165476589810001
-r--r--r-- 1 root root 1763 Jun 9 09:11 dmesg-efi-165476589811001
-r--r--r-- 1 root root 1783 Jun 9 09:11 dmesg-efi-165476589812001
-r--r--r-- 1 root root 1788 Jun 9 09:11 dmesg-efi-165476589813001
-r--r--r-- 1 root root 1788 Jun 9 09:11 dmesg-efi-165476589814001
-r--r--r-- 1 root root 1786 Jun 9 09:11 dmesg-efi-165476589815001
```
This problem affects (at least) Ubuntu 20.04 and 22.04. A quick fix
would be to configure CONFIG_EFI_VARS_PSTORE=y so that it's always
available. A long term fix would make systemd rescan the directory
after all module probing settled.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1978079/+subscriptions
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