1411203 - FireFox's autorestart of the main tabs'/content process is useless in bulk of various crashes

Status: NEW

(Core :: DOM: Content Processes, defect, P2)

Description

[User Dderss]

Attachment: FireFox 56' main tabs process gets automatically restarted after the crash but the browser is still dead, it has to be killed manually via Task Manager.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
Build ID: 20170926190823

Steps to reproduce:

Just regularly using the browser for some time.


Actual results:

Various crashes within totally different subsystems of FireFox result in the browser auto-restarting main tabs'/content process, it takes some time to fully load just as when you first start a fresh work session, but then it never reconnects to the GUI that stays forever non-responsive, failing to both render a current tab and react to users actions, including attempts to close the browser with the use of "X" window button.

When user attempts to do anything the browser window generates a standard Windows' "busy" ding as if you have a modal window open somewhere except for in this case there is no such thing.

Both the current tab as well as all other tabs are perfectly fine and get rendered flawlessly as soon as you launch FireFox anew after manually killing the browser via Task Manager.

This faulty behavior, however, does not happen every time; in some cases the browser works as it should: the main tabs'/content process gets reloaded after a crash, and FireFox totally works (at least until the next crash). 


Expected results:

The main FireFox process should check if it managed to successfully reconnect the GUI/core process with the reloaded content/tabs' process, and if it somehow fails, it should be able to relaunch the whole browser itself completely -- without forcing the user to kill it off via Task Manager.

Another issue is why this behavior happens in the first place -- but it is a much more complicated thing that is nearly impossible to trace and debug, so in this bug I am only asking to change the core FireFox process that should observe what happens better and relaunch the whole thing if GUI fails to work.

Comment 1

[User Dderss]

Just to be more clear: the memory shapshot can be implemented strictly in anonymised form without a possibility to turn the anonymisation off -- this way the privacy issue will be solved. Besides, even in this mode the user would have to submit the latest memory snapshot manually as an attachment to a Bugzilla bug, just like now, so there are two layers of the user discretion, including the use of command line parameter.

Comment 2

[User Dderss]

This refers to the possibility for extended debugging mode that could be created for the starter/core FireFox process that would require a parameter to be launched: like "firefox.exe -memsnapshot" -- it would allow users that want to help to debug crashes to force FireFox to constantly generate anonymised memory snapshots, even though it would slowdown the browser.

Comment 3

[Jim Mathies [:jimm]]

First, could you please post your about:support text. Also, are you running any form of anti-virus software?

Comment 4

[User Dderss]

I only run built-in Windows 10 Defender (formerly Microsoft Security Essentials) software. But it should not matter anyway since I do not have those bad crashes where automatic restart of content/main tabs process does not help; sometimes it does work as intended, and there is no changes in any OS/anti-virus software settings.

Here is "about:support" in JSON form:


____________________________________________________

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}

Comment 5

[Jim Mathies [:jimm]]

Can you reproduce in safe mode?

Comment 6

[User Dderss]

Not really because version 56 only causes crashes every ten days or so (versus version 55 that generated crashes way more often).

This is why I was asking if its possible to build in support for "-memsnapshot" parameter to be used with FireFox' main executable that would periodically write *anonymised* snapshots so I would be able to attach the latest one once there will be a crash. Even though such option would make FireFox slow, I am ready to go through it.

Thank you in advance.

Comment 7

[User Dderss]

As an example of a different pattern:

The crash https://crash-stats.mozilla.com/report/index/bp-cbfa60bf-d335-4ace-9e09-939341171106 has caused the main tabs/content process to restart automatically, and the browser has worked perfectly fine in this case for some time.

However, after ten minutes, the whole browser has crashes, and, weirdly, I do not see a separate crash report about this; I still only see the initial crash report that has only caused the main tabs/content process to crash and be restarted.

It can be said that the bug has caused both crashes, but usually FireFox generates SEPARATE crash reports in such cases. Why not in this case?