Steps to reproduce:

There are several prerequisites:

1. You have to have an account on some Mastodon social network instance.
2. You have to have the Extended ARIA Add-On installed and the Articles landmark activated.

Steps:

1. Log into https://dev.pinafore.social. Pinafore is an alternative web client to the Mastodon social network.

• If you're not logged in, click the AddInstance link, fill in your instance name, like mastodon.social or toot.cafe, or whichever instance you're on, then click Login.
• Authorize Pinafore to access your account.

2. After you've logged in, start navigating the Home timeline via the letter D. At some point, NVDA will cause a Windows ascending error tone to be heard, and fall silent. The braille display, if connected, will continue to blink, but NVDA is essentially dead then.
3. Restart NVDA, then simply arrow through the page onto any article. A crash does not occur, NVDA reads the article name normally.

Actual behavior:

NVDA produces an error sound, then falls silent. As if it partially crashed. Braille continues to blink, but won't respond to anything.

Expected behavior:

No crash.

System configuration:

NVDA Installed/portable/running from source:

Installed.

NVDA version:

NVDA version alpha-16298,c651588e

Windows version:

Windows 10 19H1 18282 build. But also happens on 1809 regular.

Name and version of other software in use when reproducing the issue:

Firefox Nightly 65.

Other information about your system:

Other questions:

Does the issue still occur after restarting your PC?

Yes.

Have you tried any other versions of NVDA?

2018.4beta, 2018.3.2, happens with both, too.

Log entries

Developer info for an article element that causes this problem:

INFO - globalCommands.GlobalCommands.script_navigatorObject_devInfo (15:28:21.299):
Developer info for navigator object:
name: u'Eric Eggert, RT @bigfinish@twitter.comComing September 2019, @BilliePiper is returning to the #DoctorWho universe in Rose Tyler: The Dimension Cannon. -> http://bit.ly/2FIKkiZFour episodes follow Rose\u2019s mission to seek out the Doctor, the only person who can save the doomed multiverse\u2026, 1 hour ago, @yatil@micro.yatil.net, Unlisted'
role: ROLE_DOCUMENT
states: STATE_READONLY, STATE_FOCUSABLE
isFocusable: True
hasFocus: False
Python object: <baseObject.Dynamic_BrokenFocusedStateDocumentMozillaIAccessible object at 0x05B715F0>
Python class mro: (<class 'baseObject.Dynamic_BrokenFocusedStateDocumentMozillaIAccessible'>, <class 'NVDAObjects.IAccessible.mozilla.BrokenFocusedState'>, <class 'NVDAObjects.IAccessible.mozilla.Document'>, <class 'NVDAObjects.IAccessible.mozilla.Mozilla'>, <class 'NVDAObjects.IAccessible.ia2Web.Document'>, <class 'NVDAObjects.IAccessible.ia2Web.Ia2Web'>, <class 'NVDAObjects.IAccessible.IAccessible'>, <class 'NVDAObjects.window.Window'>, <class 'NVDAObjects.NVDAObject'>, <class 'documentBase.TextContainerObject'>, <class 'baseObject.ScriptableObject'>, <class 'baseObject.AutoPropertyObject'>, <type 'object'>)
description: u''
location: RectLTWH(left=665, top=1398, width=900, height=1013)
value: None
appModule: <'firefox' (appName u'firefox', process ID 2012) at address 5766fb0>
appModule.productName: u'Firefox Nightly'
appModule.productVersion: u'65.0a1'
TextInfo: <class 'NVDAObjects.IAccessible.IA2TextTextInfo'>
windowHandle: 590326L
windowClassName: u'MozillaWindowClass'
windowControlID: 0
windowStyle: 399441920
windowThreadID: 14052
windowText: u'toot.cafe \xb7 Home - Firefox Nightly'
displayText: u''
IAccessibleObject: <POINTER(IAccessible2) ptr=0xc0e57b4 at 5a2b8f0>
IAccessibleChildID: 0
IAccessible event parameters: windowHandle=590326L, objectID=-4, childID=-67109111
IAccessible accName: u'Eric Eggert, RT @bigfinish@twitter.comComing September 2019, @BilliePiper is returning to the #DoctorWho universe in Rose Tyler: The Dimension Cannon. -> http://bit.ly/2FIKkiZFour episodes follow Rose\u2019s mission to seek out the Doctor, the only person' (truncated)
IAccessible accRole: ROLE_SYSTEM_DOCUMENT
IAccessible accState: STATE_SYSTEM_READONLY, STATE_SYSTEM_FOCUSABLE, STATE_SYSTEM_VALID (1048640)
IAccessible accDescription: u''
IAccessible accValue: None
IAccessible2 windowHandle: 590326
IAccessible2 uniqueID: -67109111
IAccessible2 role: ROLE_SYSTEM_DOCUMENT
IAccessible2 states: IA2_STATE_SELECTABLE_TEXT, IA2_STATE_OPAQUE (5120)
IAccessible2 attributes: u'margin-left:0px;text-align:start;text-indent:0px;setsize:20;container-busy:false;margin-right:0px;tag:article;class:status-article status-in-timeline;margin-top:0px;posinset:6;margin-bottom:0px;xml-roles:article;display:grid;explicit-name:true;'

End of nvda.log from pressing D before such a crash onwards

Input: kb(laptop):d
DEBUGWARNING - watchdog.watcher (15:24:05.726):
Trying to recover from freeze, core stack:
File "nvda.pyw", line 217, in
File "core.pyc", line 515, in main
File "wx\core.pyc", line 2134, in MainLoop
File "gui_init.pyc", line 963, in Notify
File "core.pyc", line 486, in run
File "queueHandler.pyc", line 86, in pumpAll
File "queueHandler.pyc", line 53, in flushQueue
File "scriptHandler.pyc", line 145, in _queueScriptCallback
File "scriptHandler.pyc", line 187, in executeScript
File "browseMode.pyc", line 414, in
File "browseMode.pyc", line 386, in quickNavScript
File "virtualBuffers_init.pyc", line 570, in _iterNodesByAttribs

DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:10.657):
Unhandled extended packet of type 'U': 'U\x05'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:10.709):
Unhandled extended packet of type 'U': 'U\xff'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:10.759):
Unhandled extended packet of type 'U': 'U\x06'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:10.809):
Unhandled extended packet of type 'U': 'U\xff'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:10.907):
Unhandled extended packet of type 'U': 'U\x08'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.061):
Unhandled extended packet of type 'U': 'U\xff'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.161):
Unhandled extended packet of type 'U': 'U\n'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.260):
Unhandled extended packet of type 'U': 'U\x0b'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.311):
Unhandled extended packet of type 'U': 'U\xff'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.460):
Unhandled extended packet of type 'U': 'U\r'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:11.559):
Unhandled extended packet of type 'U': 'U\xff'
WARNING - watchdog.watcher (15:24:20.730):
Core frozen in stack:
File "nvda.pyw", line 217, in
File "core.pyc", line 515, in main
File "wx\core.pyc", line 2134, in MainLoop
File "gui_init.pyc", line 963, in Notify
File "core.pyc", line 486, in run
File "queueHandler.pyc", line 86, in pumpAll
File "queueHandler.pyc", line 53, in flushQueue
File "scriptHandler.pyc", line 145, in _queueScriptCallback
File "scriptHandler.pyc", line 187, in executeScript
File "browseMode.pyc", line 414, in
File "browseMode.pyc", line 386, in quickNavScript
File "virtualBuffers_init.pyc", line 570, in _iterNodesByAttribs

DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:35.359):
Unhandled extended packet of type 'U': 'U\x01'
DEBUGWARNING - brailleDisplayDrivers.handyTech.BrailleDisplayDriver._handleInputStream (15:24:35.411):
Unhandled extended packet of type 'U': 'U\xff'
WARNING - watchdog.watcher (15:24:35.740):
Core frozen in stack:
File "nvda.pyw", line 217, in
File "core.pyc", line 515, in main
File "wx\core.pyc", line 2134, in MainLoop
File "gui_init.pyc", line 963, in Notify
File "core.pyc", line 486, in run
File "queueHandler.pyc", line 86, in pumpAll
File "queueHandler.pyc", line 53, in flushQueue
File "scriptHandler.pyc", line 145, in _queueScriptCallback
File "scriptHandler.pyc", line 187, in executeScript
File "browseMode.pyc", line 414, in
File "browseMode.pyc", line 386, in quickNavScript
File "virtualBuffers_init.pyc", line 570, in _iterNodesByAttribs

Other info

The pull request that will introduce these new names for the article elements into Pinafore is here.