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Groups > linux.debian.bugs.dist > #1021805

Bug#968519: dropbear-initramfs: race condition prevents launch at boot

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Package: dropbear-initramfs
Version: 2020.80-1
Severity: important

Dear Maintainer,

About four times out of five, dropbear fails to launch at boot on the
RockPro64 single-board computer. When it fails, I see this message
repeated several times, scattered between various other messages on the
serial console:

  ipconfig: no devices to configure

Finally, this message appears:

  /scripts/init-premount/dropbear: .: line 279:
  can't open '/run/net-*.conf': No such file or directory

The system then proceeds to the luks unlock prompt at the serial console
only, with dropbear not running, so the boot process will not continue
unless I connect a serial console and enter the password that way.

I have tried adding all my ethernet-related driver modules to
/etc/initramfs-tools/modules and rebuilding initramfs, but it
didn't help. I have tried using ip= kernel command line arguments
for a static address instead of DHCP, but that didn't help either.

However, editing /usr/share/initramfs-tools/scripts/init-premount/dropbear
does get it working. Making that script wait for a /run/net-*.conf file to
appear before it calls configure_networking appears to be a solution.
Even just sleeping for a few seconds before the configure_networking call
seems to work, though I don't know how consistently.

Based on this workaround and the fact that the aforementioned error messages
are interleaved with other boot messages, it looks to me like dropbear's
init-premount script is being run in parallel with driver and network setup,
and often executing before the rk3399's onboard ethernet has a chance to
finish initializing.


-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: arm64 (aarch64)

Kernel: Linux 5.7.0-2-arm64 (SMP w/6 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not
set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages dropbear-initramfs depends on:
ii  busybox          1:1.30.1-5
ii  dropbear-bin     2020.80-1
ii  initramfs-tools  0.137
ii  udev             246-2

Versions of packages dropbear-initramfs recommends:
ii  cryptsetup-initramfs  2:2.3.3-1

dropbear-initramfs suggests no packages.

-- Configuration Files:
/etc/dropbear-initramfs/config changed:
DROPBEAR_OPTIONS="-p 222"


-- no debconf information

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Bug#968519: dropbear-initramfs: race condition prevents launch at boot Forest <forestix@sonic.net> - 2020-08-16 21:40 +0200
  Bug#968519: dropbear-initramfs: race condition prevents launch at boot Guilhem Moulin <guilhem@debian.org> - 2020-08-16 23:20 +0200
    Bug#968519: dropbear-initramfs: race condition prevents launch at boot Forest <forestix@sonic.net> - 2020-08-17 03:10 +0200
      Bug#968519: dropbear-initramfs: race condition prevents launch at boot Guilhem Moulin <guilhem@debian.org> - 2020-08-17 10:50 +0200
    Bug#968519: dropbear-initramfs: race condition prevents launch at boot Forest <forestix@sonic.net> - 2020-08-19 08:40 +0200
      Bug#968519: dropbear-initramfs: race condition prevents launch at boot Guilhem Moulin <guilhem@debian.org> - 2020-08-19 14:30 +0200
  Bug#968519: dropbear-initramfs: race condition prevents launch at boot Forest <forestix@sonic.net> - 2020-08-31 21:10 +0200

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