Hi John,
On 14.09.2020 14:33, John Ogness wrote:
> Use the record extending feature of the ringbuffer to implement
> continuous messages. This preserves the existing continuous message
> behavior.
>
> Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
> Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
This patch landed recently in linux-next as commit f5f022e53b87
("printk: reimplement log_cont using record extension"). I've noticed
that it causes a regression on my test system (ARM 32bit Samsung Exynos
4412-based Trats2 board). The messages are printed correctly on the
serial console during boot, but then when I run 'dmesg' command, the log
is truncated.
Here is are the last lines of the dmesg log after this patch:
[ 6.649018] Waiting 2 sec before mounting root device...
[ 6.766423] dwc2 12480000.hsotg: new device is high-speed
[ 6.845290] dwc2 12480000.hsotg: new device is high-speed
[ 6.914217] dwc2 12480000.hsotg: new address 51
[ 8.710351] RAMDISK: squashfs filesystem found at block 0
The corresponding dmesg lines before applying this patch:
[ 8.864320] RAMDISK: squashfs filesystem found at block 0
[ 8.868410] RAMDISK: Loading 37692KiB [1 disk] into ram disk... /
[ 9.071670] /
[ 9.262498] /
[ 9.540711] /
[ 9.818031] done.
[ 10.660074] VFS: Mounted root (squashfs filesystem) readonly on
device 1:0.
[ 10.739525] EXT4-fs (mmcblk0p1): INFO: recovery required on readonly
filesystem
[ 10.745347] EXT4-fs (mmcblk0p1): write access will be enabled during
recovery
[ 10.861129] EXT4-fs (mmcblk0p1): recovery complete
[ 10.878150] EXT4-fs (mmcblk0p1): mounted filesystem with ordered data
mode. Opts: (null)
[ 10.881811] VFS: Mounted root (ext4 filesystem) readonly on device
179:49.
[ 10.889858] Trying to move old root to /initrd ...
[ 10.895192] okay
[ 10.914411] devtmpfs: mounted
[ 10.925087] Freeing unused kernel memory: 1024K
[ 10.933222] Run /sbin/init as init process
[ 10.941723] with arguments:
[ 10.949890] /sbin/init
[ 10.949900] with environment:
[ 10.949909] HOME=/
[ 10.949917] TERM=linux
[ 12.415991] random: systemd-udevd: uninitialized urandom read (16
bytes read)
[ 12.425361] random: systemd-udevd: uninitialized urandom read (16
bytes read)
[ 12.438578] random: systemd-udevd: uninitialized urandom read (16
bytes read)
...
I can provide a complete logs if that helps.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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