Intermittent shutdown crash @ mozilla::storage::Service::Observe. See attachment for full details with links to jobs and logs. Example stack: Thread 13 (crashed) 0 libxul.so!mozilla::storage::Service::Observe [mozStorageService.cpp:0e76fc9fa2ac : 959 + 0x0] r0 = 0xdc7a1ab3 r1 = 0x75f46af2 r2 = 0x75f46af2 r3 = 0xdd3a1e04 r4 = 0xf04ff8ac r5 = 0x00000001 r6 = 0x00000000 r7 = 0x00000003 r8 = 0xf04ff8a4 r9 = 0x00000000 r10 = 0xf04ff930 r12 = 0xdbbd36d1 fp = 0x00000006 sp = 0xf04ff8a0 lr = 0xda8c6e39 pc = 0xda8c6e38 Found by: given as instruction pointer in context 1 libxul.so!nsObserverList::NotifyObservers [nsObserverList.cpp:0e76fc9fa2ac : 112 + 0x7] r4 = 0xf04ff8d4 r5 = 0x00000009 r6 = 0x00000000 r7 = 0xdc7c651b r8 = 0x00000000 r9 = 0xf05d2104 r10 = 0xf04ff930 fp = 0x00000006 sp = 0xf04ff8d0 pc = 0xda440ec1 Found by: call frame info 2 libxul.so!nsObserverService::NotifyObservers [nsObserverService.cpp:0e76fc9fa2ac : 305 + 0x9] r4 = 0xf05fd414 r5 = 0xdc7c651b r6 = 0x00000001 r7 = 0x00000000 r8 = 0x00000000 r9 = 0xf05d2104 r10 = 0xf04ff930 fp = 0x00000006 sp = 0xf04ff8f0 pc = 0xda440f6f Found by: call frame info 3 libxul.so!mozilla::ShutdownXPCOM [XPCOMInit.cpp:0e76fc9fa2ac : 881 + 0xb] r4 = 0xf04ff920 r5 = 0xf04ff934 r6 = 0xf04ff91c r7 = 0xf04ff924 r8 = 0x00000000 r9 = 0xf05d2104 r10 = 0xf04ff930 fp = 0x00000006 sp = 0xf04ff910 pc = 0xda47b12d Found by: call frame info 4 libxul.so!ScopedXPCOMStartup::~ScopedXPCOMStartup [nsAppRunner.cpp:0e76fc9fa2ac : 1489 + 0x5] r4 = 0xf04ff964 r5 = 0xf055a0ec r6 = 0xf04ff990 r7 = 0xf04ff9d8 r8 = 0x00000000 r9 = 0x00000000 r10 = 0x00000000 fp = 0x00000006 sp = 0xf04ff960 pc = 0xdbbc91c7 Found by: call frame info 5 libxul.so!mozilla::DefaultDelete<ScopedXPCOMStartup>::operator() [UniquePtr.h:0e76fc9fa2ac : 528 + 0x3] r4 = 0xf055a0ec r5 = 0xf04ff9c0 r6 = 0xf04ff990 r7 = 0xf04ff9d8 r8 = 0x00000000 r9 = 0x00000000 r10 = 0x00000000 fp = 0x00000006 sp = 0xf04ff978 pc = 0xdbbc91f7 Found by: call frame info 6 libxul.so!XREMain::XRE_main [UniquePtr.h:0e76fc9fa2ac : 343 + 0x3] r4 = 0x00000000 r5 = 0xf04ff9c0 r6 = 0xf04ff990 r7 = 0xf04ff9d8 r8 = 0x00000000 r9 = 0x00000000 r10 = 0x00000000 fp = 0x00000006 sp = 0xf04ff980 pc = 0xdbbce4b7 Found by: call frame info 7 libxul.so!XRE_main [nsAppRunner.cpp:0e76fc9fa2ac : 4600 + 0xb] r4 = 0x00000000 r5 = 0xf07dfad8 r6 = 0xf04ff9c0 r7 = 0xf04ff9dc r8 = 0xf05054c8 r9 = 0xf04ffa0c r10 = 0xf04ffa60 fp = 0x00000006 sp = 0xf04ff9c0 pc = 0xdbbce713 Found by: call frame info 8 libxul.so!GeckoStart [nsAndroidStartup.cpp:0e76fc9fa2ac : 51 + 0x5] r4 = 0xf04ffae4 r5 = 0xf07dfad8 r6 = 0x00000000 r7 = 0xdd37e0f8 r8 = 0xdc7acba1 r9 = 0xab10f118 r10 = 0x12e0e880 fp = 0x12e0e8a0 sp = 0xf04ffae0 pc = 0xdbbd2cdd Found by: call frame info 9 libmozglue.so!Java_org_mozilla_gecko_mozglue_GeckoLoader_nativeRun [APKOpen.cpp:0e76fc9fa2ac : 388 + 0x1] r4 = 0xab10fab8 r5 = 0xf05293e0 r6 = 0xf07e21bc r7 = 0xdbbd2c19 r8 = 0xf04ffb30 r9 = 0xab10f118 r10 = 0x12e0e880 fp = 0x12e0e8a0 sp = 0xf04ffb00 pc = 0xf0770d0d Found by: call frame info 10 data@app@org.mozilla.fennec-1@base.apk@classes.dex + 0x9894dd r4 = 0x000002f3 r5 = 0x7369f780 r6 = 0x12e0e800 r7 = 0x12e0e840 r8 = 0x00000000 r9 = 0xab10f118 r10 = 0x12e0e880 fp = 0x12e0e8a0 sp = 0xf04ffb20 pc = 0xe3a1e4df Found by: call frame info

Also found with Pixel devices for debug builds on Robocop testPasswordProvider https://treeherder.allizom.org/logviewer.html#?job_id=5481612&repo=mozilla-central#L16387

I've been keeping copies of logs since 2017-05-22. The only time I have seen this signature in the logs is from a single try run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=a2f368d84d166fa78f74f68bb670c1c175887e5f&filter-searchStr=autophone resolving as wfm. If we ever see this again, lets file a new one.