On Thu, 13 Feb 2020 at 16:43, Naresh Kamboju [off-list ref] wrote:

arm beagleboard x15 device failed to boot Linux mainline and
linux-next kernel due
to below error.
This error occurred across all x15 device for these kernel version.

This regression started happening on x15 from this commit onwards (27th Jan)
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  git commit: aae1464f46a2403565f75717438118691d31ccf1
  git describe: v5.5-489-gaae1464f46a2


Test output log,
[   37.606241] mmc1: Card stuck being busy! mmc_poll_for_busy
[   37.611850] mmc1: cache flush error -110
[   37.615883] blk_update_request: I/O error, dev mmcblk1, sector
4302400 op 0x1:(WRITE) flags 0x20800 phys_seg 1 prio class 0
[   37.627387] Aborting journal on device mmcblk1p9-8.
[   37.635448] systemd[1]: Installed transient /etc/machine-id file.
[   37.659283] systemd[1]: Couldn't move remaining userspace
processes, ignoring: Input/output error
[   37.744027] EXT4-fs error (device mmcblk1p9):
ext4_journal_check_start:61: Detected aborted journal
[   37.753322] EXT4-fs (mmcblk1p9): Remounting filesystem read-only
[   37.917486] systemd-gpt-auto-generator[108]: Failed to dissect:
Input/output error
[   37.927825] systemd[104]:
/lib/systemd/system-generators/systemd-gpt-auto-generator failed with
exit status 1.
<>

Try to restore the value for the cache flush timeout, by updating the
define MMC_CACHE_FLUSH_TIMEOUT_MS to 10 * 60 * 1000".

The offending commit could perhaps be this one.

commit 24ed3bd01d6a844fd5e8a75f48d0a3d10ed71bf9
Author: Ulf Hansson [off-list ref]
Date:   Wed Jan 22 15:27:45 2020 +0100
mmc: core: Specify timeouts for BKOPS and CACHE_FLUSH for eMMC

[...]

Kind regards
Uffe