1721949 - Zooming in on a certain pdf consumes a huge amount of memory and causes the browser(incl. PC) to hang

Status: VERIFIED FIXED

(Firefox :: PDF Viewer, defect, P1)

Description

[Alice0775 White]

STEPS to Reproduce:

1. Open https://www.sony.jp/products/catalog/BD_DVDrecorder_news.pdf
2. Click + button of the PDF viewer several times.

Actual results:
Consumes a large amount of memory.
Browser (including PC) hangs.

Expected results:
It should use less memory.

Comment 1

[Alice0775 White]

Attachment: about:support

Comment 2

[Alice0775 White]

When switch to other tab, memory usage will decrease immediately.
So, it difficult to get memory report from use about:memory.

Comment 3

[Alice0775 White]

The problem does not occue in Firefox78esr and Firefox89.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

:alice0775, could you try to find a regression range using for example mozregression?

Comment 5

[Alice0775 White]

[Tracking Requested - why for this release]: unsable pdf viewer due to memory consumption and PB hang

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=5c402eaa028455bb2c837bb0068741f43d566787&tochange=1a154c35b1b1673c4e9f79c0f38c3d12daa71a6b

Comment 6

[Marco Castelluccio [:marco]]

Maybe a duplicate of bug 1721218.

Comment 7

[Marco Castelluccio [:marco]]

Bug 1721218 was fixed. Alice, can you test again with latest Nightly?

Comment 8

[Alice0775 White]

(In reply to Marco Castelluccio [:marco] from comment #7)

Bug 1721218 was fixed. Alice, can you test again with latest Nightly?

No, not fixed. The problem is reproduced in Nightly92.0a1(20210727094543).

Comment 9

[Alice0775 White]

The good build(20210514033445): https://share.firefox.dev/3iVX3Pl
Latest Nightly(20210727094543): https://share.firefox.dev/3BMkPpP

Comment 10

[Alice0775 White]

Attachment: memory-report_Nightly92.0a1(build ID20210727094543).json.gz

The following is how to get the memory report.

1. Open 2 browser windows(Let's call them Browser A and Browser B)
2. Load about:memory in Browser A
3. Load the pdf in Browser B and zoom in several times
4. Click Measure and save in Browser A and save (It hangs for a long time but may succeed without crashing

Comment 11

[Alice0775 White]

Attachment: memory-report_good_build(build Id20210514033445).json.gz

Comment 12

[GitHub Bugzilla PR Linker]

Attachment: Link to GitHub pull-request: https://github.com/mozilla/pdf.js/pull/13808

Comment 13

[GitHub Bugzilla PR Linker]

Attachment: Link to GitHub master push: https://github.com/mozilla/pdf.js/commit/4ad5c5d52a2e652f85a60ce2aee534e8cc75c688

Commit merged into master by GitHub
Authored by Brendan Dahl (brendandahl)

Comment 14

[Daniel Bodea [:danibodea]]

Just like in bug 1722571 and bug 1721218, I have confirmed the issue in Firefox Release v90.0.2 as the RAM used grew instantly upon loading it and then upon zooming in or out, and I have verified the fix in Firefox Beta v91.0b9 and Firefox Nightly v92.0a1 from 2021-07-30. The PDF still loads quite slow, but it does not use an absurdly high amount of RAM or get freezes or hangs.