Bug 231737 - Content disappears after screen height
Summary: Content disappears after screen height
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: Safari 15
Hardware: Mac (Intel) macOS 11
: P2 Critical
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2021-10-14 06:01 PDT by Mish
Modified: 2021-10-29 08:39 PDT (History)
4 users (show)

See Also:

Attachments
Screen recording (44.53 MB, video/quicktime)
2021-10-14 06:01 PDT, Mish 		no flags Details
Another recording of the bug (18.69 MB, video/quicktime)
2021-10-17 06:03 PDT, Mish 		no flags Details
Search bar overlay when bug is triggered (60.08 MB, video/quicktime)
2021-10-19 13:46 PDT, Mish 		no flags Details
Sample 1 (221.09 KB, text/plain)
2021-10-23 09:18 PDT, Mish 		no flags Details
Sample 2 (224.83 KB, text/plain)
2021-10-23 09:18 PDT, Mish 		no flags Details
Sample 3 (791.86 KB, text/plain)
2021-10-23 09:22 PDT, Mish 		no flags Details
Sample 4 (230.61 KB, text/plain)
2021-10-24 07:11 PDT, Mish 		no flags Details
Bug on Safari iOS (1.69 MB, image/png)
2021-10-29 08:36 PDT, Mish 		no flags Details
Bug on Safari iOS (817.48 KB, image/png)
2021-10-29 08:37 PDT, Mish 		no flags Details
Bug on Safari iOS (620.58 KB, image/png)
2021-10-29 08:38 PDT, Mish 		no flags Details
Sample 5 (372.72 KB, text/plain)
2021-10-29 08:38 PDT, Mish 		no flags Details
Sample 6 (202.22 KB, text/plain)
2021-10-29 08:39 PDT, Mish 		no flags Details
Sample 7 (4.24 MB, text/plain)
2021-10-29 08:39 PDT, Mish 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Mish 2021-10-14 06:01:31 PDT 
Created attachment 441208 [details]
Screen recording

no adblocker is in use and the issue happens on wikipedia and other sites
Comment 1 Simon Fraser (smfr) 2021-10-14 09:33:45 PDT 
Do you have Safari extensions installed? Does disabling them fix this?
Comment 2 Mish 2021-10-14 12:37:54 PDT 
the bug occurs only occasionally

disabling extensions, reloading the page and cleaning cache has no effect, in this broken state only a restart helps

also i remember somewhat similar thing happened in PDF files (pages would stop to render), but not sure if it still happens and if it is caused by the same bug

will report back when i'm able to trigger it again
thanks
Comment 3 Mish 2021-10-17 06:03:38 PDT 
Created attachment 441534 [details]
Another recording of the bug

was having the bug again today, randomly
no extensions activated, caches clean
Comment 4 Mish 2021-10-19 13:46:33 PDT 
Created attachment 441786 [details]
Search bar overlay when bug is triggered

when the bug occurs, search bar overlay stays within viewport
Comment 5 Simon Fraser (smfr) 2021-10-19 13:49:59 PDT 
When this happens, can you find the PID of the WebProcess for that tab in Activity Monitor, and then run 'sample <pid>' and attach the output?
Comment 6 Radar WebKit Bug Importer 2021-10-21 06:03:02 PDT 
<rdar://problem/84504637>
Comment 7 Mish 2021-10-23 09:18:11 PDT 
Created attachment 442261 [details]
Sample 1
Comment 8 Mish 2021-10-23 09:18:33 PDT 
Created attachment 442262 [details]
Sample 2
Comment 9 Mish 2021-10-23 09:19:49 PDT 
Added some samples from Activity Monitor
page: https://shikijs.github.io/twoslash/
Comment 10 Mish 2021-10-23 09:22:09 PDT 
Created attachment 442264 [details]
Sample 3
Comment 12 Simon Fraser (smfr) 2021-10-25 11:49:27 PDT 
None of those samples show anything unusual going on.

Mish, what is your display configuration and hardware setup?
Comment 13 Mish 2021-10-25 12:37:16 PDT 
macOS Big Sur 11.6 (20G165)

MacBook Pro 13 (2017), Two Thunderbolt 3 ports, 2.3 GHz Dual-Core Intel Core i5, 8GB RAM

no external display/graphics, resolution set to "Scaled"

the bug started happening after Safari got updated to new look
Comment 14 Mish 2021-10-29 08:36:08 PDT 
i'm currently noticing same thing on Safari on iOS
Comment 15 Mish 2021-10-29 08:36:54 PDT 
Created attachment 442816 [details]
Bug on Safari iOS
Comment 16 Mish 2021-10-29 08:37:54 PDT 
Created attachment 442817 [details]
Bug on Safari iOS
Comment 17 Mish 2021-10-29 08:38:20 PDT 
Created attachment 442818 [details]
Bug on Safari iOS
Comment 18 Mish 2021-10-29 08:38:59 PDT 
Created attachment 442819 [details]
Sample 5
Comment 19 Mish 2021-10-29 08:39:17 PDT 
Created attachment 442820 [details]
Sample 6
Comment 20 Mish 2021-10-29 08:39:48 PDT 
Created attachment 442821 [details]
Sample 7