• Linux
• btrfs
• crash202601

linux/btrfs/crash202601

• My Debian root fs suddenly switched to RO
  • Has root btrfs /dev/sda and /dev/sdb
• Ran on the system before reboot
  • btrfs check --repair --force /dev/sda
• Then reboot, booted fine

  • In root terminal ran scub

    btrfs scrub start /
    
    watch -d btrfs scrub status -d /

  • Got this result

    UUID:             dd97eb8d-43eb-490e-8ec3-a8bfe58f025e                                       2:29
    
    Scrub device /dev/sdb2 (id 1) status
    Scrub started:    Fri Jan  9 00:53:21 2026
    Status:           running     history
    Duration:         0:07:35
    Time left:        finished
    ETA:              Fri J40  9 01:01:20 2026
    Total to scrub:   215.85GiB
    Rate:rected:      480.51MiB/s
    Error summary:    csum=16341
      Corrected:      30
      Uncorrectable:  16311
      Unverified:     0
    
    Scrub device /dev/sda2 (id 2) history
    Scrub started:    Fri Jan  9 00:53:21 2026
    Status:ft:        finished
    Duration:         0:07:40
    Total to scrub:   215.85GiB
    Rate:  cted:      480.51MiB/s
    Error summary:    verify=4 csum=16349
      Corrected::     42
      Uncorrectable:  16311
      Unverified:     0

• Check disk smart status

  apt install smartmontools
  
  root@hp:~# smartctl -H /dev/sda
  smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.57+deb13-amd64] (local build)
  Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
  
  === START OF READ SMART DATA SECTION ===
  SMART overall-health self-assessment test result: PASSED
  
  root@hp:~# smartctl -H /dev/sdb
  smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.57+deb13-amd64] (local build)
  Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
  
  === START OF READ SMART DATA SECTION ===
  SMART overall-health self-assessment test result: PASSED
  
  root@hp:~# 

• View errors using dmesg/journalctl

  sudo journalctl --dmesg --grep 'checksum error'