1246250 - [e10s] crash in mozalloc_abort | NS_DebugBreak | mozilla::dom::PContentParent::Write

Status: RESOLVED FIXED

(Core :: DOM: Copy & Paste and Drag & Drop, defect, P3)

Description

[Alice0775 White]

This bug was filed from the Socorro interface and is 
report bp-fc2e053a-4af8-4863-8a7e-1f95c2160205.
=============================================================

Aurora crashes when I dragover a file(png/mp4 etc) from explorer to the Aurora46.0a2 which is running on VM.

Reproducible: almost 100%

Steps to reproduce:
1. Install VMware Player 7 to Windows7 64bit
2  Setip Ubuntu 14.04LtS 32bit as guest OS
3. Install VMware Tools to the guest OS

4. Open Aurora46.0a2 of the guest OS
5. Dragover a file from explorer to the Aurora46.0a2 

Actual Results:
Browser crashes

Comment 1

[Alice0775 White]

bp-2b87d1f5-5b45-41c4-884d-834682160205

Comment 2

[Blake Kaplan (:mrbkap) (inactive)]

This doesn't appear to affect a Windows host and a Windows guest. I'll have to try a Windows host and Linux guest next to try to debug (which makes sense -- drag and drop is extremely platform-specific).

Comment 3

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

It could also be a difference between Player and WorkStation or god knows what else.

Comment 4

[Blake Kaplan (:mrbkap) (inactive)]

Attachment: Patch v1

I still haven't reproduced this bug, but reading the code shows that the only way we could have a null Blob actor is if [1] fails. It seems very reasonable to me that the file created by the VMWare drag gesture would not have a file size, causing us to fail to get it. I'll file a followup bug on figuring out how to successfully drop the file in this case, but this patch should, at the very least, stop us from crashing.

Try run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=45dc2b8d92e2

[1] https://dxr.mozilla.org/mozilla-central/rev/e847cfcb315f511f4928b03fd47dcf57aad05e1e/dom/base/File.cpp#795,806-809

Comment 5

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/3e7beec40c33

Comment 6

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/3e7beec40c33