My Android app, which I'm running on a Samsung Galaxy S4 and starting via Eclipse, occasionally crashes. Instead of dumping a stacktrace to LogCat it says that it dumps it to /data/anr/traces.txt. The problem is I don't have permission to read the anr directory so 'adb pull /data/anr/traces.txt' just gives a permission denied error.
I just want to read my stacktrace. Is there anyway to force it to dump to LogCat? Or at least dump it to a file I have permission to read?
Much thanks...
You should be able to dump the logs locally like this:
adb logcat -d > log.txt
Related
When I connect to a device or an emulator using adb, I can clear logcat using adb logcat -c. The issue I am facing is that I often get the following message:
failed to clear the 'main' log
AFAIK, 'main' is a non-rooted buffer which means that I should be able to clear it without root. What can then be the reason for this message?
You might have your Android Studio opened, please close it and run again , it should able to clear the logs.
use
adb logcat -b all -c
it will clear all buffers. sometime adb logcat -c will not work because of many process using it like android studio.
Logcat messages are stored in buffer, you can try,
adb logcat -c
Clear (flush) the selected buffers and exit. The default buffer set is main, system and crash. To clear all of the buffers, use -b all -c.
source: logcat doc
For more logcat usage, check How do I get the logfile from an Android device?
I am running my app in emulator through command line referring this link. But i am not able to find any command through which i can take log of the app running on emulator.
The Command to receive the log buffers on commandline is:
[adb] logcat [<option>] ... [<filter-spec>] ...
There are several options that can be passed that can be found here.
For more informations continue reading here:
Logcat Documentation
Reading and Writing Logs
I've been experiencing a great deal of instability on my Verizon Galaxy S III, and I believe it's related to the WiFi driver, or at least something in the networking stack. I get daily full system crashes that cause soft reboots of the OS.
In order to trace to the root of the issue, I'd like to see historical crash data for the Android OS. Please note that I am NOT developing an app, and I do not want instruction on how to use LogCat to trace issues within an in-development app. I want to see the Android system crash logs, but I'm not sure where to look for them.
After ANR happens, you would find call stack of related process at /data/anr/traces.txt
After application crashes, you might find call stack of crashed application under /data/tombstones directory.
See Android: How to get kernel logs after kernel panic?
It looks like /data/dontpanic/ should contain some "apanic" files, but only if the kernel's apanic support is enabled, and it worked. (I haven't seen anything there in my case, but maybe you'll be luckier than I ...)
crash report can be found at default path: /data/anr/
some manufacture place in custom path like: /data/system/ckerror
use cmd: adb pull /data/anr "dest path"
example:
in windows cmd prompt:
adb pull /data/anr c:\trace
The document states that
Android stores trace information when it experiences an ANR. On older OS releases, there's >a single /data/anr/traces.txt file on the device.
On newer OS releases, there are multiple >/data/anr/anr_* files. You can access ANR traces from a device or emulator by using >Android Debug Bridge (adb) as root:
adb root
adb shell ls /data/anr
adb pull /data/anr/<filename>
Usually the every crash is stored in traces.txt file under /data/anr/ folder of internal storage. Try checking this file.
I found a file call crash.txt inside the directory /data/Logging which seems to contain brief stack-traces from the last several crashes that occurred on the device.
Where an Android app crashes and its not in debug mode, where can I retrieve the stacktrace?
Is this on your device?
I assume since your retrieving it you own it. Plug the device into the computer and via adb
issue
adb logcat > log.txt
(log.txt will be filled with a logcat of all stack traces and recent events). Hit CTRL C after about 10 seconds of data collection.
I'm looking for the log file(s) that are made by logcat. Where are they typically stored?
They are stored as circular memory buffers on the device. If you run "adb logcat > myfile" on your host system, you can retrieve the content into a file.
To get post-mortem information from a device it is helpful to see the timestamp as well. To let you know when the event occurred, try:
adb logcat -d -v time > logfile.txt
If you just want to see the current contents of the log, you can do
adb logcat -d > myfile
It will exit after dumping the log.
(suravi's suggestion would be good if you wanted to watch the log while testing.)