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

[Kay One]

Thanks for the reply Lennart.

1) mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 28, 0) = -1 EINVAL
> (Invalid argument) is the culprit for this error???
2) If YES. Is this JFFS2 MTD file system bug or
3) Is this not considered as systemd bug to support compatibility for such
file system? Check first FS support writable mappings or not and if not
then use other method to enable Persistence logging for systemd?

On Tue, May 21, 2019 at 5:05 PM Lennart Poettering <lennart at poettering.net>
wrote:

> 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
>
1)
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