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Re: PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat

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Maria Sophia wrote:
> This is why Samsung devices produce massive logcat noise compared to Pixel, 
> OnePlus, Motorola, etc., apparently. 
> 
> How to filter out Samsung's spam on Windows:
>  adb logcat *:E | findstr /V /C:"MARsPolicyManager" /C:"Watchdog" /C:"SDHMS"
> 
> This removes 95% of Samsung's bogus "errors" and leaves actual useful logs.

ADDITION

Below are specific Windows & Linux commands (findstr vs grep) to help
others capture Android error logs and warnings and information output.

This removes the flood of Samsung garbage in the logcat log:
 adb logcat *:E | findstr /V /C:"MARsPolicyManager" /C:"Watchdog" /C:"SDHMS"
 adb logcat *:E | grep -vE "MARsPolicyManager|Watchdog|SDHMS"

This shows only real app crashes:
 adb logcat -v time | findstr /C:"FATAL EXCEPTION" /C:"AndroidRuntime"
 adb logcat -v time | grep -E "FATAL EXCEPTION|AndroidRuntime"

This shows only battery or power errors:
 adb logcat | findstr /I /C:"battery" /C:"thermal" /C:"power" /C:"charger" /C:"voltage" /C:"current"
 adb logcat | grep -iE "battery|thermal|power|charger|voltage|current"

This shows only network errors:
 adb logcat *:E | findstr /I /C:"Wifi" /C:"DNS" /C:"Network" /C:"Socket"
 adb logcat *:E | grep -iE "wifi|dns|network|socket"

This shows network warnings and info also:
 adb logcat | findstr /I /C:"Wifi" /C:"wpa" /C:"DNS" /C:"Network" /C:"Connectivity" /C:"Socket" /C:"EHOSTUNREACH" /C:"ETIMEDOUT"
 adb logcat | grep -iE "wifi|wpa|dns|network|connectivity|socket|EHOSTUNREACH|ETIMEDOUT"

This shows ANR (App Not Responding) events:
 adb logcat | findstr /I /C:"ANR in"
 adb logcat | grep -i "ANR in"

This shows low-memory and OOM events:
 adb logcat | findstr /I /C:"lowmemorykiller" /C:"OutOfMemory" /C:"oom_adj"
 adb logcat | grep -iE "lowmemorykiller|OutOfMemory|oom_adj"

This shows storage or filesystem errors:
 adb logcat | findstr /I /C:"fsck" /C:"ext4" /C:"f2fs" /C:"I/O error" /C:"write failed"
 adb logcat | grep -iE "fsck|ext4|f2fs|I/O error|write failed"

This shows camera errors:
 adb logcat | findstr /I /C:"CameraService" /C:"CameraProvider" /C:"E/Camera"
 adb logcat | grep -iE "CameraService|CameraProvider|E/Camera"

This shows audio errors:
 adb logcat | findstr /I /C:"AudioFlinger" /C:"AudioTrack" /C:"AudioRecord" /C:"E/Audio"
 adb logcat | grep -iE "AudioFlinger|AudioTrack|AudioRecord|E/Audio"

This shows Bluetooth errors:
 adb logcat | findstr /I /C:"Bluetooth" /C:"bt_stack" /C:"btif" /C:"hci"
 adb logcat | grep -iE "Bluetooth|bt_stack|btif|hci"

This shows GPS or location errors:
 adb logcat | findstr /I /C:"LocationManager" /C:"Gnss" /C:"gps" /C:"E/Gps"
 adb logcat | grep -iE "LocationManager|Gnss|gps|E/Gps"

This shows app install or update failures:
 adb logcat | findstr /I /C:"PackageManager" /C:"INSTALL_FAILED" /C:"DexOpt" /C:"dex2oat"
 adb logcat | grep -iE "PackageManager|INSTALL_FAILED|DexOpt|dex2oat"

This shows SELinux denials:
 adb logcat | findstr /I /C:"avc: denied"
 adb logcat | grep -i "avc: denied"

This shows system_server crashes:
 adb logcat | findstr /I /C:"system_server" /C:"crash"
 adb logcat | grep -iE "system_server.*crash"

This shows wakelock issues:
 adb logcat | findstr /I /C:"WakeLock" /C:"wakelock"
 adb logcat | grep -iE "WakeLock|wakelock"

This shows thermal throttling:
 adb logcat | findstr /I /C:"thermal" /C:"throttle" /C:"overheat"
 adb logcat | grep -iE "thermal|throttle|overheat"

I'll write up a linux/windows script to make all this easy peasy.
-- 
Every thread I author is intended to be a useful resource to thousands of 
people who have the same needs, wants & desires as this is a common need.

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PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat Maria Sophia <mariasophia@comprehension.com> - 2026-06-17 01:13 -0500
  Re: PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat Maria Sophia <mariasophia@comprehension.com> - 2026-06-19 14:52 -0500
    Re: PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat Maria Sophia <mariasophia@comprehension.com> - 2026-06-19 15:32 -0500
      Re: PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat Hank Rogers <Hank@nospam.invalid> - 2026-06-19 17:09 -0500
        Re: PSA: How to capture Android crash logs or app errors & warnings on your desktop using adb & logcat Maria Sophia <mariasophia@comprehension.com> - 2026-06-27 03:57 -0400

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