Closed Bug 1042097 Opened 7 years ago Closed 7 years ago
Save Android tombstones to blobber
In bug 803158 (and related), we planned long ago to deploy ndk-stack to foopies, check for tombstones and if found, generate ndk-stack reports in the test logs. Let's do something simpler instead: Check for tombstones and save them to blobber when found. Test investigators can then pull the tombstones and run ndk-stack if desired -- no need to deploy another tool, less clutter in crash reports, and maybe we will actually get this done!
On Android 2.3, there is no /data/tombstones directory. We should probably create it, similar to what we did recently for /data/anr. On Android 4.0 and Android 4.2 x86, files are created in /data/tombstones, but I am having trouble retrieving them -- devicemanager.pullFile fails for some reason.
(In reply to Geoff Brown [:gbrown] from comment #1) ...caused by simple permission problems on /data/tombstones. Solved by liberal use of root=True! Another trick here is that the tombstone files have names like "tombstone_00". Blobber refuses to upload those because there is no recognized file extension -- renaming to tombstone_00.txt does wonders! For robocop runs, and Android x86, it is easy to generate 2 or more "tombstone_00" files, so I also had to watch for existing files and make unique file names.
Structurally, I'm using the same approach as we have used for ANR reports: delete any tombstones at the start of the test, then when checking for crashes at the end of a test, pull any tombstones found. To check for tombstones, automation simply pulls any files from the device's /data/tombstones directory and puts them in the MOZ_UPLOAD_DIR, for blobber processing. As I mentioned in a bug comment, the file name needs to be modified, adding a .txt extension and an integer for uniqueness. Try run without any crashes: https://tbpl.mozilla.org/?tree=Try&rev=80a43eca764e. Note that a few of these runs actually have tombstones -- these seem to be from SIGSEGV's in shutdown which are not caught be breakpad -- cool! Try run with intentional crash: https://tbpl.mozilla.org/?tree=Try&rev=7f3259bb065c. Note that some of these do not have tombstones, especially on Android 2.3. I've checked and the tombstone files just aren't there -- a crash does not guarantee the creation of a tombstone file. That's okay with me: We'll upload the tombstone when we can.
Attachment #8470334 - Flags: review?(jmaher)
> Note that a few of these runs actually have tombstones > -- these seem to be from SIGSEGV's in shutdown which are > not caught be breakpad -- cool! I think we should make these fatal - what are your thoughts?
(In reply to Ed Morley [:edmorley] from comment #4) > I think we should make these fatal - what are your thoughts? I would not make them fatal. I think it is unlikely that a failure that late in shutdown will affect the user experience -- better to focus our efforts elsewhere.
Makes sense, sounds good to me :-)
Comment on attachment 8470334 [details] [diff] [review] upload tombstone files to blobber Oops - jmaher is away this week. Maybe dminor will take the review?
Attachment #8470334 - Flags: review?(jmaher) → review?(dminor)
Comment on attachment 8470334 [details] [diff] [review] upload tombstone files to blobber Review of attachment 8470334 [details] [diff] [review]: ----------------------------------------------------------------- Overall, looks good to me. r+ once my concerns about the creation/existence of "/data/tombstones" are addressed. ::: build/mobile/remoteautomation.py @@ +130,5 @@ > else: > print "%s not found" % traces > > + def deleteTombstones(self): > + # delete any existing tombstone files, but ensure the directory exists What are the consequences of "/data/tombstones" being missing? It looks like we only do the mkdir after a run. If firefox can create the tombstone directory for us, then I don't see any reason to do the mkdir here. If it can't, then the mkdir should be part of a separate function called prior to the tests running. Since the comment says "ensure" I think we should either raise an error if we are unable to create the directory, or change the wording in the comment. @@ +161,5 @@ > + except DMError: > + # This may just indicate that no tombstone files are present > + pass > + self.deleteTombstones() > + # add a .txt file extension to each tombstone file name, so nit: trailing whitespace @@ +171,5 @@ > + for i in xrange(1, sys.maxint): > + newname = "%s.%d.txt" % (f, i) > + if not os.path.exists(newname): > + os.rename(f, newname) > + break You could use for i, f in enumerate(glob.glob(...)) and then use the value of i as the unique integer to avoid the second loop.
Attachment #8470334 - Flags: review?(dminor) → review+
(In reply to Dan Minor [:dminor] from comment #8) > What are the consequences of "/data/tombstones" being missing? I'm glad you asked. I was not sure if a crash would create /data/tombstones and was being cautious. But I checked - https://tbpl.mozilla.org/?tree=Try&rev=05f1c2557dc0 - and indeed, the tombstones directory is created if missing and everything continues to work. I removed the mkdir/chmod. > You could use > for i, f in enumerate(glob.glob(...)) > and then use the value of i as the unique integer to avoid the second loop. I think that almost works, but doesn't (without additional provisions) in the case of, say, multiple crashes in a robocop run. For example, if robocop-2 has crashes in both testNewTab and testOverscroll, testNewTab writes tombstone_00 which is pulled and renamed to tombstone_00_1, then testOverscroll writes tombstone_00 and a new call to checkTombstones will try tombstone_00_1 again before blobber has cleaned out the upload directory. To handle that, I think we pretty much need a check for local file existence and a separate loop. I'll keep the original code. https://hg.mozilla.org/integration/mozilla-inbound/rev/f2e3009e1bd1
Status: NEW → RESOLVED
Closed: 7 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla34
"/data/tombstones does not exist; tombstone check skipped" https://tbpl.mozilla.org/php/getParsedLog.php?id=46167051&tree=Mozilla-Inbound Is this expected?
Yes - that's fine. Our Android 2.3 emulator image starts off without any /data/tombstones directory. If there are no crashes, the system does not create /data/tombstones. If there is a crash, the system may or may not create /data/tombstones (I'm not sure of the conditions that make a difference) and may or may not create a tombstone file. If we find a tombstone, I'm happy to put it on blobber in case someone finds it interesting; if it's not there, I can live with that.
(In reply to Geoff Brown [:gbrown] from comment #12) > Our Android 2.3 emulator image starts off without any /data/tombstones > directory. If there are no crashes, the system does not create > /data/tombstones. Ah this was the piece I was missing; sounds fine to me :-)
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