Bug 282093 – IndexedDB breaks randomly | UnknownError: Error looking up record in object store by key range

• Status: NEW
• Component: Website Storage

[Mark Langer]

Created attachment 473040 [details]
Diagnostics Report MacOS - MacBook Apple Silicon

Every week, our users
* get errors writing or reading from IndexedDB.
* binary files inside IndexedDB are mixed up (the key with which an image file is stored returns a different image when reading it.)

This happens only on Apple devices and only with Safari. Hence, we can rule out own code errors.

Seen on:
* MacBook Pro (Apple Silicon)
* iPhones (iOS 17.4 and 18.0.1 - non-exhaustive list)
* iPads (iPadOS 17.4 and 18.0.1 - non-exhaustive list)

Error Messages include:
* UnknownError: Error looking up record in object store by key range
* AbortError
* Cannot open cursor to perform index gets in database (may be emitted by idb by Jake Archibald)

Short term solution:
* Quit Safari. Closing the window or opening a new tab doesn't help. Assumption: Some background service(s) is/are breaking.

Today, we saw a diagnostics report on a MacBook on com.apple.WebKit.WebContent happening while the error was reproducible.
Content: CPU above 50% for over 90 seconds.

Thought: There might be a threshold on Macs killing processes if they use too much CPU for too long?

Attachments:
* Diagnostics Report
* Console Logs Safari

[Mark Langer]

Created attachment 473041 [details]
Console Logs Safari - MacBook Pro Apple Silicon

Attachment 2:

[Mark Langer]

Possibly related, yet not resolved:

https://bugs.webkit.org/show_bug.cgi?id=277615
https://bugs.webkit.org/show_bug.cgi?id=273827
https://bugs.webkit.org/show_bug.cgi?id=197050

[Mark Langer]

Today we had another incident with mixed up photo files from IndexedDB.

The diagnostics reports showed two dubious events:

1) -----------
com.apple.WebKit.Networking
Event:            disk writes
Action taken:     none
Writes:           2147.50 MB of file backed memory dirtied over 33710 seconds (63.71 KB per second average), exceeding limit of 24.86 KB per second over 86400 seconds
Writes limit:     2147.48 MB
Limit duration:   86400s
Writes caused:    2147.50 MB


2) -----------
com.apple.WebKit.WebContent
Event:            cpu usage
Action taken:     none
CPU:              90 seconds cpu time over 145 seconds (62% cpu average), exceeding limit of 50% cpu over 180 seconds
CPU limit:        90s
Limit duration:   180s
CPU used:         90s
CPU duration:     145s

--------------

Quitting Safari and restarting it usually resolves the issue for a while.

[Mark Langer]

Created attachment 473062 [details]
WebKit Networking Diagnostic Log

[Mark Langer]

Created attachment 473063 [details]
WebKit WebContent Diagnostic Log

[Mark Langer]

Created attachment 473079 [details]
WebKit WebContent Diagnostic Log

Today, we whitnessed the shuffling again with another customer on MacOS 15.0.1.

WebContent caused a diagnostic log again.

[Radar WebKit Bug Importer]

<rdar://problem/139068307>

[Mark Langer]

Hi Apple team! Are there any updates on this?

The issue is still happening in the same ways as described above.

The issue is still unassigned. Is there a brave engineer wanting to tackle this? 🦸🏼‍♂️🦸🏽‍♀️