Android Fatal signal 11 SIGSEGV at 0x636f7d89 code 1 How can it be tracked down

Question

I ve been reading the other posts on tracking down the reasons for getting a SIGSEGV in an Android app  I plan to scour my app for possible NullPointers related to Canvas use  but my SIGSEGV barfs up a different memory address each time  Plus I ve seen code 1 and code 2  If the memory address was 0x00000000  I d have a clue it is a NullPointer   The last one I got was a code 2   A libc 4969   Fatal signal 11  SIGSEGV  at 0x42a637d9  code 2    Any suggestions on how to track this down   I have a suspect  but I m not keen on experimenting with it yet  My app uses the OSMDroid API for offline mapping  The OverlayItem class represents markers nodes on the map  I have a Service that collects data via the network to populate the OverlayItem which are then displayed on the map  In an effort to simplify my design  I extended OverlayItem into my own NodeOverlayItem class  which includes some addition attributes I use in the UI Activity and in the Service  This gave me a single point of Item information for the UI and Service  I used Intents to broadcast to the Activity to refresh the UI map when something changed  The Activity binds to the Service and there s a Service method to get the list of NodeOverlayItem s  I think it might be the OSMDroid API s use of OverlayItem  and my Service updating node information at the same time   a concurrency issue   As I write this I think that s really the problem  The headache isn t splitting out the Node and OverlayItem from NodeOverlayItem  it s that the Activity will need some data from the Node  that the Service holds  Plus when the Activity is created  onResume  etc     the OverlayItem objects will need to be re-created from the Node data that the Service has been maintaining while the Activity was away  e g  You start the app  the Service collects data  the UI displays it  you go to Home  then back to the app  the Activity will need to pull and re-create the OverlayItem s from the latest Service node data   I know this isn t a great or clear questions  It s like all my SO questions are niche or obscure  If anyone has a suggestion on how to interpret those SIGSEGV errors  it would be greatly appreciated   UPDATE Here s the latest crash captured during a debug session  I have 3 of these devices being used for testing and they don t all crash reliably when I m developing and testing  I included a bit extra just so the GC logging could be noted  You can see the problem is probably not related to memory exhaustion   03-03 02 02 38 328  I CommService 7477   Received packet from  192 168 1 102 03-03 02 02 38 328  I CommService 7477   Already processed this packet  It s a re-broadcast from another node  or from myself  It s not a repeat broadcast though  03-03 02 02 38 406  D CommService 7477   Checking OLSRd info    03-03 02 02 38 460  D CommService 7477   Monitoring nodes    03-03 02 02 38 515  D dalvikvm 7477   GC CONCURRENT freed 2050K  16  free 17151K 20359K  paused 3ms 6ms 03-03 02 02 38 515  I CommService 7477   Received packet from  192 168 1 102 03-03 02 02 38 515  D CommService 7477   Forwarding packet  4f68802cf10684a83ac4936ebb3c934d  along to other nodes  03-03 02 02 38 609  I CommService 7477   Received packet from  192 168 1 100 03-03 02 02 38 609  D CommService 7477   Forwarding packet  e4bc81e91ec92d06f83e03068f52ab4  along to other nodes  03-03 02 02 38 609  D CommService 7477   Already processed this packet  4204a5b27745ffe5e4f8458e227044bf 03-03 02 02 38 609  A libc 7477   Fatal signal 11  SIGSEGV  at 0x68f52abc  code 1  03-03 02 02 38 914  I DEBUG 4008                                                                   03-03 02 02 38 914  I DEBUG 4008   Build fingerprint   Lenovo IdeaTab A1107 A1107 4 0 4 MR1 eng user 20120719 150703 user release-keys  03-03 02 02 38 914  I DEBUG 4008   pid  7477  tid  7712   gt  gt  gt  com test testm  lt  lt  lt  03-03 02 02 38 914  I DEBUG 4008   signal 11  SIGSEGV   code 1  SEGV MAPERR   fault addr 68f52abc 03-03 02 02 38 914  I DEBUG 4008    r0 68f52ab4  r1 412ef268  r2 4d9c3bf4  r3 412ef268 03-03 02 02 38 914  I DEBUG 4008    r4 001ad8f8  r5 4d9c3bf4  r6 412ef268  r7 4c479df8 03-03 02 02 38 914  I DEBUG 4008    r8 4d9c3c0c  r9 4c479dec  10 46cf260a  fp 4d9c3c24 03-03 02 02 38 914  I DEBUG 4008    ip 40262a04  sp 4d9c3bc8  lr 402d01dd  pc 402d0182  cpsr 00000030 03-03 02 02 38 914  I DEBUG 4008    d0  00000001000c0102  d1  3a22364574614c7d 03-03 02 02 38 914  I DEBUG 4008    d2  403fc0000000007d  d3  363737343433350a 03-03 02 02 38 914  I DEBUG 4008    d4  49544341223a2273  d5  6f6567222c224556 03-03 02 02 38 914  I DEBUG 4008    d6  3a223645676e6f4c  d7  000000013835372d 03-03 02 02 38 914  I DEBUG 4008    d8  0000000000000000  d9  4040000000000000 03-03 02 02 38 914  I DEBUG 4008    d10 0000000000000000  d11 4040000000000000 03-03 02 02 38 914  I DEBUG 4008    d12 4040000000000000  d13 0000000000000021 03-03 02 02 38 914  I DEBUG 4008    d14 0000000000000000  d15 0000000000000000 03-03 02 02 38 914  I DEBUG 4008    d16 3fe62e42fefa39ef  d17 3ff0000000000000 03-03 02 02 38 914  I DEBUG 4008    d18 3fe62e42fee00000  d19 0000000000000000 03-03 02 02 38 914  I DEBUG 4008    d20 0000000000000000  d21 3ff0000000000000 03-03 02 02 38 914  I DEBUG 4008    d22 4028000000000000  d23 3ff0000000000000 03-03 02 02 38 914  I DEBUG 4008    d24 0000000000000000  d25 3ff0000000000000 03-03 02 02 38 914  I DEBUG 4008    d26 0000000000000000  d27 c028000000000000 03-03 02 02 38 914  I DEBUG 4008    d28 0000000000000000  d29 3ff0000000000000 03-03 02 02 38 914  I DEBUG 4008    d30 3ff0000000000000  d31 3fecccccb5c28f6e 03-03 02 02 38 914  I DEBUG 4008    scr 60000013 03-03 02 02 39 046  I DEBUG 4008             00  pc 0006b182   system lib libcrypto so  EVP DigestFinal ex  03-03 02 02 39 046  I DEBUG 4008             01  pc 0006b1d8   system lib libcrypto so  EVP DigestFinal  03-03 02 02 39 054  I DEBUG 4008             02  pc 0001f814   system lib libnativehelper so 03-03 02 02 39 054  I DEBUG 4008             03  pc 0001ec30   system lib libdvm so  dvmPlatformInvoke  03-03 02 02 39 054  I DEBUG 4008             04  pc 00058c70   system lib libdvm so   Z16dvmCallJNIMethodPKjP6JValuePK6MethodP6Thread  03-03 02 02 39 054  I DEBUG 4008   code around pc  03-03 02 02 39 054  I DEBUG 4008   402d0160 0003151e 4604b570 f7ff460d 4620ff81      p  F F     F 03-03 02 02 39 054  I DEBUG 4008   402d0170 f7ff4629 bd70ff93 4604b570 460e6800   F    p p  F h F 03-03 02 02 39 054  I DEBUG 4008   402d0180 68834615 dd062b40 21fa4810 44784a10   F h     H   JxD 03-03 02 02 39 054  I DEBUG 4008   402d0190 f7c8447a 6821f80f 698a4620 47904631  zD     h F i1F G 03-03 02 02 39 054  I DEBUG 4008   402d01a0 b1154606 68836820 6822602b b12b6a13   F   h h   h j   03-03 02 02 39 054  I DEBUG 4008   code around lr  03-03 02 02 39 054  I DEBUG 4008   402d01bc 68e06821 21006c4a ea0af7c4 bd704630   h hJl      0Fp  03-03 02 02 39 054  I DEBUG 4008   402d01cc 00031492 000314b5 4604b570 ffcef7ff          p  F     03-03 02 02 39 054  I DEBUG 4008   402d01dc 46204605 ff12f7ff bd704628 4604b573   F F     Fp s  F 03-03 02 02 39 054  I DEBUG 4008   402d01ec 2102460d fb36f002 42ab6823 b123d020   F    6  h B     03-03 02 02 39 054  I DEBUG 4008   402d01fc b1136c5b f7c868e0 68a0fccf 05c26025   l   h     h     03-03 02 02 39 054  I DEBUG 4008   memory map around addr 68f52abc  03-03 02 02 39 054  I DEBUG 4008   4d8c5000-4d9c4000  03-03 02 02 39 054  I DEBUG 4008    no map for address  03-03 02 02 39 054  I DEBUG 4008   b0001000-b0009000  system bin linker 03-03 02 02 39 054  I DEBUG 4008   stack  03-03 02 02 39 054  I DEBUG 4008       4d9c3b88  408d1f90   system lib libdvm so 03-03 02 02 39 054  I DEBUG 4008       4d9c3b8c  412ef258   dev ashmem dalvik-heap  deleted  03-03 02 02 39 054  I DEBUG 4008       4d9c3b90  00000001   03-03 02 02 39 054  I DEBUG 4008       4d9c3b94  408d6c58   system lib libdvm so 03-03 02 02 39 054  I DEBUG 4008       4d9c3b98  408d6fa8   system lib libdvm so 03-03 02 02 39 054  I DEBUG 4008       4d9c3b9c  4c479dec   03-03 02 02 39 054  I DEBUG 4008       4d9c3ba0  46cf260a   system framework core odex 03-03 02 02 39 054  I DEBUG 4008       4d9c3ba4  408735e7   system lib libdvm so 03-03 02 02 39 054  I DEBUG 4008       4d9c3ba8  412ef258   dev ashmem dalvik-heap  deleted  03-03 02 02 39 054  I DEBUG 4008       4d9c3bac  002bf070   heap  03-03 02 02 39 054  I DEBUG 4008       4d9c3bb0  412ef258   dev ashmem dalvik-heap  deleted  03-03 02 02 39 054  I DEBUG 4008       4d9c3bb4  00000000   03-03 02 02 39 054  I DEBUG 4008       4d9c3bb8  412ef268   dev ashmem dalvik-heap  deleted  03-03 02 02 39 054  I DEBUG 4008       4d9c3bbc  00000000   03-03 02 02 39 054  I DEBUG 4008       4d9c3bc0  df0027ad   03-03 02 02 39 054  I DEBUG 4008       4d9c3bc4  00000000   03-03 02 02 39 054  I DEBUG 4008    00 4d9c3bc8  001ad8f8   heap  03-03 02 02 39 054  I DEBUG 4008       4d9c3bcc  002ae0b8   heap  03-03 02 02 39 054  I DEBUG 4008       4d9c3bd0  00000004   03-03 02 02 39 054  I DEBUG 4008       4d9c3bd4  402d01dd   system lib libcrypto so 03-03 02 02 39 054  I DEBUG 4008    01 4d9c3bd8  001ad8f8   heap  03-03 02 02 39 054  I DEBUG 4008       4d9c3bdc  002ae0b8   heap  03-03 02 02 39 054  I DEBUG 4008       4d9c3be0  00000004   03-03 02 02 39 054  I DEBUG 4008       4d9c3be4  4024e817   system lib libnativehelper so 03-03 02 02 39 406  D CommService 7477   Checking OLSRd info    03-03 02 02 39 500  D CommService 7477   Monitoring nodes    03-03 02 02 39 500  D dalvikvm 7477   GC FOR ALLOC freed 2073K  16  free 17118K 20359K  paused 51ms 03-03 02 02 39 632  D dalvikvm 7477   GC CONCURRENT freed 1998K  16  free 17162K 20359K  paused 2ms 4ms 03-03 02 02 40 406  D CommService 7477   Checking OLSRd info    03-03 02 02 40 445  D CommService 7477   Monitoring nodes    03-03 02 02 40 562  D dalvikvm 7477   GC CONCURRENT freed 2045K  16  free 17158K 20359K  paused 3ms 4ms 03-03 02 02 41 406  D CommService 7477   Checking OLSRd info    03-03 02 02 41 445  D CommService 7477   Monitoring nodes    03-03 02 02 41 531  D dalvikvm 7477   GC CONCURRENT freed 2045K  16  free 17154K 20359K  paused 3ms 12ms 03-03 02 02 42 406  D CommService 7477   Checking OLSRd info    03-03 02 02 42 445  D CommService 7477   Monitoring nodes    03-03 02 02 42 507  D dalvikvm 7477   GC CONCURRENT freed 2068K  16  free 17128K 20359K  paused 3ms 4ms 03-03 02 02 42 679  D dalvikvm 7477   GC CONCURRENT freed 2006K  16  free 17161K 20359K  paused 2ms 12ms 03-03 02 02 43 140  I BootReceiver 1236   Copying  data tombstones tombstone 05 to DropBox  SYSTEM TOMBSTONE  03-03 02 02 43 210  D dalvikvm 1236   GC FOR ALLOC freed 912K  17  free 10207K 12295K  paused 62ms 03-03 02 02 43 265  D dalvikvm 1236   GC FOR ALLOC freed 243K  16  free 10374K 12295K  paused 49ms 03-03 02 02 43 265  I dalvikvm-heap 1236   Grow heap  frag case  to 10 507MB for 196628-byte allocation

User · Accepted Answer

OK  I m really sorry to those that have actually submitted comments and answers  but I found the problem  I don t think this will help a lot of others trying to track down their personal SIGSEGV  but mine  and it was very hard  was entirely related to this   https   code google com p android issues detail id 8709  The libcrypto so in my dump kind of clued me in  I do a MD5 hash of packet data when trying to determine if I ve already seen the packet  and skipping it if I had  I thought at one point this was an ugly threading issue related to tracking those hashes  but it turned out it was the java security MessageDigest class  It s not thread safe   I swapped it out with a UID I was stuffing in every packet based on the device UUID and a timestamp  No problems since   I guess the lesson I can impart to those that were in my situation is  even if you re a 100  Java application  pay attention to the native library and symbol noted in the crash dump for clues  Googling for SIGSEGV   the lib  so name will go a lot farther than the useless code 1  etc    Next think about where your Java app could touch native code  even if it s nothing you re doing  I made the mistake of assuming it was a Service   UI threading issue where the Canvas was drawing something that was null   the most common case I Googled on SIGSEGV  and ignored the possibility it could have been completely related to code I wrote that was related to the lib  so in the crash dump  Naturally java security would use a native component in libcrypto so for speed  so once I clued in  I Googled for Android   SIGSEGV   libcrypto so and found the documented issue  Good luck

User · Answer

check your native functions whether it is returning properly or not If it is not returned please add return statements

User · Answer

I ve faced with SIGSEGV on Android 4 4 4  Nexuses  Samsungs  And it turned out that fatal error was in parsing null String using DecimalFormat   static DecimalFormat decimalFormat   new DecimalFormat                  void someMethod String value            Number number   decimalFormat parse value    value is null  SIGSEGV will happen          On Android   21 it was handled successfully with try catch

User · Answer

For me  on Android Studio 4 1  what did the trick was good ole File  gt  Invalidate Cache  amp  Restart No more Fatal Signals after that  I m sure it had something to do with the profiler  but can t be certain  I just know restarting AS stopped the crashes on my emulator

User · Answer

In my case  I am using Xamarin Forms  this error was thrown due to a binding error - e g      lt Label Grid Column  4  Grid Row  1  VerticalTextAlignment  Start  HorizontalTextAlignment  Center   VerticalOptions  Start  HorizontalOptions  Start  FontSize  10  TextColor  Pink  Text   Binding    gt  lt  Label gt    Basically I deleted the view model property by mistake  For Xamarin developers  if you have the same issue  check your bindings

User · Answer

I was getting this error when using a bitmap like this    bmp   BitmapFactory decodeResource this getResources    R drawable myBitMap     What fixed the problem for me was to reduce the size of the bitmap   1000px high to 700px

User · Answer

I also got this error many times and I solved it  This error will be faced in case of memory management in native side   Your application is accessing memory outside of its address space  This is most likely an invalid pointer access  SIGSEGV   segmentation fault in native code  Since it is not occurring in Java code you won t see a stack trace with details  However  you may still see some stack trace information in the logcat if you look around a bit after the application process crashes  It will not tell you the line number within the file  but will tell you which object files and addresses were in use in the call chain  From there you can often figure out which area of the code is problematic  You can also setup a gdb native connection to the target process and catch it in the debugger

User · Answer

I faced this issue moment ago  after migrating from android support to androidx   The problem was renderscript   Solution  I removed from my build gradle those two lines   renderscriptTargetApi 21 renderscriptSupportModeEnabled true   after that project building failed  because of unresolved references   import androidx renderscript Allocation  import androidx renderscript Element  import androidx renderscript RenderScript  import androidx renderscript ScriptIntrinsicBlur    so I ve changed them to   import android renderscript Allocation  import android renderscript Element  import android renderscript RenderScript  import android renderscript ScriptIntrinsicBlur    After that all problems were gone

User · Answer

I was getting this error by saving an object to the shared preferences as a gson converted string  The gson String was no good  so retrieving and deserializing the object was not actually working correctly  This meant any subsequent accesses to the object resulted in this error  Scary

User · Answer

I had this issue with a package that was added to my app  FancyShowCaseView  and caused this problem on pre-lolipop  that package was written in kotlin and my main codes were written in java  so now I m checking version in pre-lolipop and don t let its class to be executed  temporary solved the problem  check this out if you have similar problem like me

User · Answer

Build fingerprint     motorola harpia harpia 6 0 1 MPIS24 241-2 50-16 16 user release-keys    Revision   p1b0  ABI   arm  pid  18139  tid  25935  name  GLThread   2137      com portable3d okt a3dmap1  lt  lt  lt  signal 11  SIGSEGV   code 2    SEGV ACCERR   fault addr 0x7452f000   2 out of 12 phones returned an error  found the problem was in onDrawFrame     some objects were null  I don   t know why  I just set   if gears  null  return

User · Answer

If you had added some native C code in your project this answer could be helpful   I had added some native C code in android project   Now i was trying to access that code which was returning native string to me  before processing the the string i had set its default value as nullptr  Now upon retrieving its value in java code ran into this issue   As our native C code is out from java directory so getting no clue of exact line of code which is creating the issue  So i would suggest you to check your  cpp file and try to find any clue there   Hope so you will get rid of the issue soon

User · Answer

For me that issue was due to a bad cast between two activities  I recently moved this method from Activity1 to another 2   Doing so  the refactor left this explicit cast as it was before   So instead of doing     Activity1  mainActivity  hideDialog      I was supposed to do     Activity2  mainActivity  hideDialog      Note  But this error did not happen on android 8 0 I m not yet sure why        Hope it helps

User · Answer

I had this segmentation fault error because of Memory issues  My struct having many variables and arrays  had this Array of size 1024      Reducing the size to 512  the error was gone    P S  This is a workaround and not a solution   It is necessary to find the struct size and dynamic memory allocation is a better option

User · Answer

Try disabling Android hardware acceleration in your manifest   android hardwareAccelerated  false

User · Answer

I had the issue when I was creating a PDF using Android s PDF APIs and I accidentally used the canvas save   and canvas restore   after I had closed a pdf page

User · Answer

I ve encountered this error when I tried to access the  canvas  outside of onDraw        private Canvas canvas        Override     protected void onDraw Canvas canvas            this canvas   canvas                         private class ScaleListener extends ScaleGestureDetector SimpleOnScaleGestureListener            Override         public boolean onScale ScaleGestureDetector detector                 canvas save       here   A very bad practice

User · Answer

Add these two lines to your build gradle in the android section   android      compileOptions               sourceCompatibility 1 8             targetCompatibility 1 8

User · Answer

Today I faced Fatal signal 11  SIGSEGV   code 1  fault addr 0x8 in tid 18161 issue and I struggle half day to solve this  I tried many things clearing cache and deleting  gradle file and all  Finally I disable Instant Run and now I am not getting this issue again  Now my application is working after enabling instant run also  It may be the instant run problem  Try with disabling and enabling instant run From this answer   Go to Android Studio Settings or Preferences  for MAC  - gt  Build Execution Deployment - gt  Instant Run  Then deselect the  quot Enable Instant Run quot  checkbox at the top

User · Answer

In my case the issue was being caused by the Android Profiler  In Android Studio  click on  Android Profiler  and  end session     Ironically  it was also causing extreme performance issues in the application

User · Answer

If you are using vitamio library and this fatal error occur    Then make sure that in your project gradle targetSdkVersion must be less than 23   thanks

User · Answer

I got this error when I used ViewTreeObserver inside onDraw   function    Override protected void onDraw Canvas canvas           super onDraw canvas       ViewTreeObserver vto   mTextView getViewTreeObserver        vto addOnGlobalLayoutListener new ViewTreeObserver OnGlobalLayoutListener              Override         public void onGlobalLayout                    some animation

User · Answer

Check your JNI native code  One of my references was null  but it was intermittent  so it wasn t very obvious

User · Answer

First  get your tombstone stack trace  it will be printed every time your app crashes  Something like this                                                                   Build fingerprint   XXXXXXXXX  pid  1658  tid  13086   gt  gt  gt  system server  lt  lt  lt  signal 11  SIGSEGV   code 1  SEGV MAPERR   fault addr 64696f7e  r0 00000000  r1 00000001  r2 ad12d1e8  r3 7373654d  r4 64696f72  r5 00000406  r6 00974130  r7 40d14008  r8 4b857b88  r9 4685adb4  10 00974130  fp 4b857ed8  ip 00000000  sp 4b857b50  lr afd11108  pc ad115ebc  cpsr 20000030  d0  4040000040000000  d1  0000004200000003  d2  4e72cd924285e370  d3  00e81fe04b1b64d8  d4  3fbc71c7009b64d8  d5  3fe999999999999a  d6  4010000000000000  d7  4000000000000000  d8  4000000000000000  d9  0000000000000000  d10 0000000000000000  d11 0000000000000000  d12 0000000000000000  d13 0000000000000000  d14 0000000000000000  d15 0000000000000000  scr 80000012            00  pc 000108d8   system lib libc so           01  pc 0003724c   system lib libxvi020 so           02  pc 0000ce02   system lib libxvi020 so           03  pc 0000d672   system lib libxvi020 so           04  pc 00010cce   system lib libxvi020 so           05  pc 00004432   system lib libwimax jni so           06  pc 00011e74   system lib libdvm so           07  pc 0004354a   system lib libdvm so           08  pc 00017088   system lib libdvm so           09  pc 0001c210   system lib libdvm so           10  pc 0001b0f8   system lib libdvm so           11  pc 00059c24   system lib libdvm so           12  pc 00059e3c   system lib libdvm so           13  pc 0004e19e   system lib libdvm so           14  pc 00011b94   system lib libc so           15  pc 0001173c   system lib libc so  code around pc  ad115e9c 4620eddc bf00bd70 0001736e 0001734e  ad115eac 4605b570 447c4c0a f7f44620 e006edc8  ad115ebc 42ab68e3 68a0d103 f7f42122 6864edd2  ad115ecc d1f52c00 44784803 edbef7f4 bf00bd70  ad115edc 00017332 00017312 2100b51f 46682210   code around lr  afd110e8 e2166903 1a000018 e5945000 e1a02004  afd110f8 e2055a02 e1a00005 e3851001 ebffed92  afd11108 e3500000 13856002 1a000001 ea000009  afd11118 ebfffe50 e1a01004 e1a00006 ebffed92  afd11128 e1a01005 e1550000 e1a02006 e3a03000   stack      4b857b10  40e43be8       4b857b14  00857280       4b857b18  00000000       4b857b1c  034e8968       4b857b20  ad118ce9   system lib libnativehelper so     4b857b24  00000002       4b857b28  00000406   Then  use the addr2line utility  find it in your NDK tool-chain  to find the function that crashes  In this sample  you do  addr2line -e -f libc so 0001173c   And you will see where you got the problem  Of course this wont help you since it is in libc   So you might combine the utilities of arm-eabi-objdump to find the final target   Believe me  it is a tough task         Just for an update  I think I was doing Android native build from the whole-source-tree for quite a long time  until today I have myself carefully read the NDK documents  Ever since the release NDK-r6  it has provided a utility called ndk-stack   Following is the content from official NDK documents with the NDK-r9 tar ball   Overview   ndk-stack is a simple tool that allows you to filter stack traces as they appear in the output of  adb logcat  and replace any address inside a shared library with the corresponding   values   In a nutshell  it will translate something like     I DEBUG       31                                                                     I DEBUG       31   Build fingerprint   generic google sdk generic  2 2 FRF91 43546 eng test-keys    I DEBUG       31   pid  351  tid  351   gt  gt  gt   data local ndk-tests crasher  lt  lt  lt    I DEBUG       31   signal 11  SIGSEGV   fault addr 0d9f00d8   I DEBUG       31    r0 0000af88  r1 0000a008  r2 baadf00d  r3 0d9f00d8   I DEBUG       31    r4 00000004  r5 0000a008  r6 0000af88  r7 00013c44   I DEBUG       31    r8 00000000  r9 00000000  10 00000000  fp 00000000   I DEBUG       31    ip 0000959c  sp be956cc8  lr 00008403  pc 0000841e  cpsr 60000030   I DEBUG       31             00  pc 0000841e   data local ndk-tests crasher   I DEBUG       31             01  pc 000083fe   data local ndk-tests crasher   I DEBUG       31             02  pc 000083f6   data local ndk-tests crasher   I DEBUG       31             03  pc 000191ac   system lib libc so   I DEBUG       31             04  pc 000083ea   data local ndk-tests crasher   I DEBUG       31             05  pc 00008458   data local ndk-tests crasher   I DEBUG       31             06  pc 0000d362   system lib libc so   I DEBUG       31     Into the more readable output                Crash dump               Build fingerprint   generic google sdk generic  2 2 FRF91 43546 eng test-keys    pid  351  tid  351   gt  gt  gt   data local ndk-tests crasher  lt  lt  lt    signal 11  SIGSEGV   fault addr 0d9f00d8   Stack frame  00  pc 0000841e   data local ndk-tests crasher   Routine zoo in  tmp foo crasher jni zoo c 13   Stack frame  01  pc 000083fe   data local ndk-tests crasher   Routine bar in  tmp foo crasher jni bar c 5   Stack frame  02  pc 000083f6   data local ndk-tests crasher   Routine my comparison in  tmp foo crasher jni foo c 9   Stack frame  03  pc 000191ac   system lib libc so   Stack frame  04  pc 000083ea   data local ndk-tests crasher   Routine foo in  tmp foo crasher jni foo c 14   Stack frame  05  pc 00008458   data local ndk-tests crasher   Routine main in  tmp foo crasher jni main c 19   Stack frame  06  pc 0000d362   system lib libc so   Usage   To do this  you will first need a directory containing symbolic versions of your application s shared libraries  If you use the NDK build system  i e  ndk-build   then these are always located under  PROJECT PATH obj local   where  stands for your device s ABI  i e  armeabi by default    You can feed the logcat text either as direct input to the program  e g    adb logcat    NDK ndk-stack -sym  PROJECT PATH obj local armeabi   Or you can use the -dump option to specify the logcat as an input file  e g    adb logcat  gt   tmp foo txt  NDK ndk-stack -sym  PROJECT PATH obj local armeabi -dump foo txt   IMPORTANT    The tool looks for the initial line containing starts in the logcat output  i e  something that looks like                                                                      When copy pasting traces  don t forget this line from the traces  or ndk-stack won t work correctly   TODO   A future version of ndk-stack will try to launch adb logcat and select the library path automatically  For now  you ll have to do these steps manually   As of now  ndk-stack doesn t handle libraries that don t have debug information in them  It may be useful to try to detect the nearest function entry point to a given PC address  e g  as in the libc so example above

[android] Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?

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