[systemd-devel] Failed to open system journal: Invalid argument

[Lennart Poettering]

On Di, 21.05.19 16:45, Kay One (kayone007 at gmail.com) wrote:

> Hi Lennart,
>
> Thanks for the reply.
> JFFS2 is the file system being used in my case. Also, if I would delete
> /var/log/journal directory then these errors are stopping.
> Meaning while writing to persistence storage this error is persisting all
> the time.
>
> cat /proc/cmdline
> console=ttyS0,115200 root=/dev/mtdblock2 rw rootfstype=jffs2
>
> df -Tk
> Filesystem           Type       1K-blocks      Used Available Use% Mounted
> on
> /dev/root            *jffs2*          81792     61220     20572  75% /
> devtmpfs             devtmpfs      506040         4    506036   0% /dev
> tmpfs                tmpfs         514744         4    514740   0% /dev/shm
> tmpfs                tmpfs         514744     13268    501476   3% /run
> tmpfs                tmpfs         514744         0    514744   0%
> /sys/fs/cgroup
> tmpfs                tmpfs         514744         0    514744   0% /tmp
> /dev/mtdblock1       *jffs2*          20416      6784     13632  33%
> /home/root/apps
> tmpfs                tmpfs         102948         0    102948   0%
> /run/user/0
>
> Suspicious cause for this error:
> ------------------------------------------
>
>
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 28, 0) = -1 EINVAL
> (Invalid argument)

The journal requires a storage file system that supports writable
memory mapping. Your's (jffs2) apparently does not, it's too limited
for that.

Maybe you can work with the kernel maintainers of that file system to
add proper support for writbale mmap()?

Lennart

--
Lennart Poettering, Berlin