OneNote importer fails with WebAssembly.Instance(): Out of memory on Windows 10

[vlodkok-stack]

Operating system

Windows

Joplin version

3.6.15

Desktop version info

Joplin 3.6.15 (Windows x64)
Windows 10 22H2 (19045.7548)
20 GB RAM (~40% free during import)

Joplin 3.6.15 (prod, win32)

Device: win32, Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
ID клієнта: ce94d3aeb6b84262b5e0400aca069d81
Версія синхронізації: 3
Версія профайлу: 49
Підтримка Keychain: Так
Alternative instance ID: -
Sync target: OneDrive
Редактор: Розширений текст

Ревізія: c615726

Backup: 1.5.1
Freehand Drawing: 4.3.0

Current behaviour

Steps

Import a normal .one notebook (~150 MB).
Import starts.
Joplin reports:
RangeError: WebAssembly.Instance(): Out of memory:
Cannot allocate Wasm memory for new instance

Stack points to:

@joplin/onenote-converter/renderer/pkg/renderer.js

After that Joplin reports:

Failed to load @joplin/onenote-converter

This is misleading because the package is present and the actual failure is the WebAssembly initialization.

Additional observation

On two occasions Windows later crashed with BSOD (0x139 INVALID_BALANCED_TREE, ImgLock.sys), but I'm not claiming Joplin caused it. The reproducible problem is the WebAssembly initialization failure.

Expected behaviour

No response

Logs

No response

[vlodkok-stack]

The issue is reproducible with multiple notebooks.

50–60 MB .one notebooks import successfully.
~150 MB notebook consistently fails.
Another notebook over 200 MB fails with the exact same WebAssembly.Instance(): Out of memory error.
System has 20 GB RAM, memory is not exhausted.
Disabling an unrelated third-party filesystem filter driver (ImgLock.sys) eliminated BSODs, but the importer error remains unchanged.

[Rygaa]

Hello, thanks for reporting this bug. I tried with ~200 MB and ~700 MB onenote files, but I could not reproduce it. I only got the same error when I forced WebAssembly to use very low memory. If possible, could you share the onenote file that caused the erro?

[vlodkok-stack]

Hello, Thank you for your prompt reply. I think I’ll be able to, but I need to check my notebooks first to make sure there isn’t anything confidential (work-related) in them. That will take a little while. пн, 10 серп. 2026 р. о 11:04 Aissa Benfodda ***@***.***> пише:

…

*Rygaa* left a comment (laurent22/joplin#16157) <#16157 (comment)> Hello, thanks for reporting this bug. I tried with ~200 MB and ~700 MB onenote files, but I could not reproduce it. I only got the same error when I forced WebAssembly to use very low memory. If possible, could you share the onenote file that caused the erro? — Reply to this email directly, view it on GitHub <#16157?email_source=notifications&email_token=CK277PONLZNPIWPFHMWBNAT5JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5237524852>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/CK277PNWSXI4HV6EKBPQX6D5JF6YTAVCNFSNUABEKJSXA33TNF2G64TZHM3TSMJWGI3DQMR3JFZXG5LFHM2TAOBSHA2DOOJVGKQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/CK277PMVE77427J5QGYCSDD5JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/CK277PPEUUIBG4I5PXKY6H35JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[vlodkok-stack]

Hello, I can share one of my notebooks with you, provided there’s a way to do so without publishing the notebook or linking to it on GitHub. Thank you. пн, 10 серп. 2026 р. о 14:02 Vlodko K ***@***.***> пише:

…

Hello, Thank you for your prompt reply. I think I’ll be able to, but I need to check my notebooks first to make sure there isn’t anything confidential (work-related) in them. That will take a little while. пн, 10 серп. 2026 р. о 11:04 Aissa Benfodda ***@***.***> пише: > *Rygaa* left a comment (laurent22/joplin#16157) > <#16157 (comment)> > > Hello, thanks for reporting this bug. I tried with ~200 MB and ~700 MB > onenote files, but I could not reproduce it. I only got the same error > when I forced WebAssembly to use very low memory. If possible, could you > share the onenote file that caused the erro? > > — > Reply to this email directly, view it on GitHub > <#16157?email_source=notifications&email_token=CK277PONLZNPIWPFHMWBNAT5JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5237524852>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/CK277PNWSXI4HV6EKBPQX6D5JF6YTAVCNFSNUABEKJSXA33TNF2G64TZHM3TSMJWGI3DQMR3JFZXG5LFHM2TAOBSHA2DOOJVGKQXMAQ> > . > Triage notifications, keep track of coding agent tasks and review pull > requests on the go with GitHub Mobile for iOS > <https://github.com/notifications/mobile/ios/CK277PMVE77427J5QGYCSDD5JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> > and Android > <https://github.com/notifications/mobile/android/CK277PPEUUIBG4I5PXKY6H35JF6YTA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRTG42TENBYGUZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. > Download it today! > You are receiving this because you authored the thread.Message ID: > ***@***.***> >

[Rygaa]

Is it possible to send it to my email: aissabenfodda@protonmail.com

[vlodkok-stack]

I've uploaded it to the cloud. You should have received the link in your email by now. чт, 13 серп. 2026 р. о 03:52 Aissa Benfodda ***@***.***> пише:

…

*Rygaa* left a comment (laurent22/joplin#16157) <#16157 (comment)> Is it possible to send it to my email: ***@***.*** — Reply to this email directly, view it on GitHub <#16157?email_source=notifications&email_token=CK277PMQNDFXJISPVK7S5IT5JUGLZA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRXGQ2TSMRZGAZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5274592902>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/CK277PLUV7DYOCOWHKGBNHT5JUGLZAVCNFSNUABEKJSXA33TNF2G64TZHM3TSMJWGI3DQMR3JFZXG5LFHM2TAOBSHA2DOOJVGKQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/CK277PM5ANBYIDFWDZ3XZST5JUGLZA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRXGQ2TSMRZGAZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/CK277PNXK2SLSBKHI33LALT5JUGLZA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMRXGQ2TSMRZGAZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[Rygaa]

Hi, thanks for sending the file.

I tested it with Joplin 3.6.15, and the import worked correctly. (I didn't show the content of the imported onenote because I am not sure if you are ok with me showing it)

working.mp4

In the next video, I limited WebAssembly to 26 memory pages which caused the error

not_working.mp4

The error happens before Joplin reads the .one file. So the file itself does not seem broken. However, I still cannot reproduce the error normally on my computer.

Since the file works here, and I can only reproduce the error by adding a memory limit, you sure there is nothing on your computer that may be limiting WebAssembly memory?