texture - decode - In excess of 100 "DECODE FAILED: ... Discard: 6, reason: LLKDUMessageError::flush()" log events in session

[monty-linden]

Environment

7.2.1.17108480561

Description

Doing another session disconnect dive from one of Strawberry's working sessions. Unrelated to the disconnect, I see over 100 of the KDU decode errors mentioned above in the logs found here:
https://lindenlab.slack.com/archives/C02R43FJP/p1759174003130039

Examples:

2025-09-29T17:32:32Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:32Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:32Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: 1ec19f7f-0b91-85e3-50ed-cb00b091a1dc Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:32Z WARNING #APR# llcommon/llapr.cpp(236) _ll_apr_warn_status : APR: C:\\a\\viewer\\viewer\\indra\\llcommon\\llapr.cpp:641 The system cannot find the file specified.  
2025-09-29T17:32:32Z WARNING #APR# llcommon/llapr.cpp(642) LLAPRFile::remove :  Attempting to remove filename: C:\\Users\\strawberry\\AppData\\Local\\SecondLife\\texturecache\\1\\1ec19f7f-0b91-85e3-50ed-cb00b091a1dc.texture
2025-09-29T17:32:33Z INFO #LLProcess# llcommon/llprocess.cpp(711) LLProcess::LLProcess : SLPlugin.exe (11188): launched cd "C:\\Program Files\\SecondLifeViewer\\llplugin": "C:\\Program Files\\SecondLifeViewer\\SLPlugin.exe" 54671
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: 9def2957-d2c8-abdf-7c19-a7b0377caae7 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: 9e41e718-b7ec-2c4d-b34a-9d805548bef7 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: 878813f8-748a-02d2-624b-47dbec0b8424 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: a6270b88-da23-56f3-8e8e-dc513cc7a92f Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: a84c9d30-bb9a-1457-31fe-629256dcc5b4 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: 4268f30c-9803-6a4f-f62f-d9bb79c4ff07 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z WARNING #APR# llcommon/llapr.cpp(236) _ll_apr_warn_status : APR: C:\\a\\viewer\\viewer\\indra\\llcommon\\llapr.cpp:641 The system cannot find the file specified.  
2025-09-29T17:32:33Z WARNING #APR# llcommon/llapr.cpp(642) LLAPRFile::remove :  Attempting to remove filename: C:\\Users\\strawberry\\AppData\\Local\\SecondLife\\texturecache\\4\\4268f30c-9803-6a4f-f62f-d9bb79c4ff07.texture
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: bbdd941c-e592-959c-412d-39c8554da703 Discard: 6, reason: LLKDUMessageError::flush()
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Kakadu Core Error:\n
2025-09-29T17:32:33Z INFO # llkdu/llimagej2ckdu.cpp(188) LLKDUMessage::put_text : KDU Error: Attempting to access a non-existent resolution level within some tile-component.  Problem almost certainly caused by trying to discard more resolution levels than the number of DWT levels used to compress a tile-component.
2025-09-29T17:32:33Z WARNING #Texture# newview/lltexturefetch.cpp(2334) LLTextureFetchWorker::callbackDecoded : DECODE FAILED: bd801f54-586c-6d91-73d7-87a119d35dc9 Discard: 6, reason: LLKDUMessageError::flush()

Not certain if this is causing problems in the scene or other places but it does seem anomalous.

I find these rather frequently in Strawberry's sessions and see the #4486 GHI as well.

m

Reproduction steps

Strawberry might have some ideas...

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[akleshchev]

It is anomalous, viewer doesn't support discard 6 and shouldn't be requesting it.