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Bug#1089511: zram-tools: Since kernel 6.12 the lz4 algo is not available and zramswap.service fails

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Package: zram-tools
Version: 0.3.5-1~exp1
Severity: important

Dear Maintainer,

Since installing latest kernel 6.12 (I use sid), the only algos available are lzo-rle and lzo, as can be verified by 
root@siddie:~# cat /sys/block/zram0/comp_algorithm
[lzo-rle] lzo 

However, in the default settings /etc/default/zramswap , the compression algorithm is set as ALGO=lz4 , which makes the zramswap.service to fail with the log as follows:

Dec 08 02:21:06 siddie.localdomain systemd[1]: Starting zramswap.service - Linux zramswap setup...
Dec 08 02:21:06 siddie.localdomain zramswap[4543]: /usr/sbin/zramswap: line 53: echo: write error: Invalid argument
Dec 08 02:21:06 siddie.localdomain root[4550]: Error: setting compression algo to lz4
Dec 08 02:21:06 siddie.localdomain zramswap[4550]: <13>Dec  8 02:21:06 root: Error: setting compression algo to lz4
Dec 08 02:21:06 siddie.localdomain systemd[1]: zramswap.service: Main process exited, code=exited, status=1/FAILURE
Dec 08 02:21:06 siddie.localdomain systemd[1]: zramswap.service: Failed with result 'exit-code'.
Dec 08 02:21:06 siddie.localdomain systemd[1]: Failed to start zramswap.service - Linux zramswap setup.

The problem can be temporarily fixed two ways:
- Manually change ALGO=lz4 in /etc/default/zramswap to one of the supported algorithms, ALGO=lzo (or ALGO=lzo-rle )
or
- Use an earlier kernel (less than 6.12)

I am reporting this because the defaults fail with most recent kernel; and I am not sure if it is just for this kernel, or this is how it is supposed to be in the future.

Thanks,
manul


-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.3-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8), LANGUAGE=en_CA:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages zram-tools depends on:
ii  bc  1.07.1-4

zram-tools recommends no packages.

zram-tools suggests no packages.

-- Configuration Files:
/etc/default/zramswap changed:
ALGO=lzo-rle
PERCENT=50
SIZE=512
PRIORITY=100


-- no debconf information

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Bug#1089511: zram-tools: Since kernel 6.12 the lz4 algo is not available and zramswap.service fails manul <manul91@abv.bg> - 2024-12-08 09:00 +0100
  Bug#1089511: zram-tools: Since kernel 6.12 the lz4 algo is not available and zramswap.service fails Reiner Herrmann <reiner@reiner-h.de> - 2024-12-12 00:50 +0100
  Bug#1089511: zram-tools: Fixed in kernel 6.12.6-1 manul <manul91@abv.bg> - 2024-12-21 23:20 +0100

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