Bug#1116125: linux-image-amd64: system booted into emergency mode after upgrade to 6.12.48
Control: tags -1 + moreinfo
Hi
On Wed, Sep 24, 2025 at 04:06:00AM +0000, Lloyd wrote:
> Package: linux-image-amd64
> Version: 6.12.48-1
> Severity: normal
>
> Upgraded the kernel from linux-image-6.12.43+deb13-amd64 to
> linux-image-6.12.48+deb13-amd64 via apt.
>
> On reboot into the new kernel, system was unreachable via SSH. Upon
> checking the console, the system entered emergency mode awaiting
> password to enter the emergency shell. Rebooting did not clear the
> fault.
>
> Upon checking further, the system could not mount two file systems,
> /boot and /boot/efi, which are both stored on onboard eMMC. All
> other FS are stored on various other disks. When logged into the
> emergency shell, I verified that device nodes /dev/mmcblk* did not
> exist hence the above from /etc/fstab could not be mounted. Multiple
> reboots into the new kernel could not clear the fault.
>
> I booted into the old kernel 6.12.43 and the system booted normally.
> All filesystems mounted as expected.
>
> I then booted into the new kernel 6.12.48 again and the system
> booted normally. Unable to reproduce after this point.
>
> I initially suspected hardware failure but this made no sense, as
> the eMMC disk it was unable to detect contained the bootloader,
> kernel, and initrd it was successfully running from to partially
> boot. So GRUB could see it just fine, but the kernel could not.
>
> Relevant dmesg:
>
> [ 1.530670] mmc1: SDHCI controller on PCI [0000:00:1c.0] using ADMA 64-bit
> [ 1.533312] mmc0: SDHCI controller on PCI [0000:00:1b.0] using ADMA 64-bit
> [ 1.677950] mmc1: new DDR MMC card at address 0001
> [ 1.695380] mmcblk1: mmc1:0001 004GA0 3.69 GiB
> [ 1.698606] mmcblk1: p1 p2
> [ 1.699469] mmcblk1boot0: mmc1:0001 004GA0 2.00 MiB
> [ 1.700699] mmcblk1boot1: mmc1:0001 004GA0 2.00 MiB
> [ 1.701879] mmcblk1rpmb: mmc1:0001 004GA0 512 KiB, chardev (244:0)
> [ 8.356788] systemd[1]: Expecting device dev-mmcblk1p2.device - /dev/mmcblk1p2...
> [ 9.875619] EXT4-fs (mmcblk1p2): mounting ext2 file system using the ext4 subsystem
>
> Relevant lspci:
> 00:1b.0 SD Host controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series SDXC/MMC Host Controller (rev 0b)
> 00:1c.0 SD Host controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series eMMC Controller (rev 0b)
As I understand you are not able to reproduce anymore the problem.
Before we though close the bug, can you report back if it makes a
difference if you do a cold boot of 6.12.48 or a reboot from
6.12.43-1?
I.e. please test both variants rebooting from 6.12.43-1 to 6.12.48-1
and then a cold boot into 6.12.48-1.
Regards,
Salvatore
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