[Bugfix][Model] Fix Qwen3-Omni crash when audio and image coexist in interleaved path

[harris26-G]

Summary

Fix Qwen3-Omni-MoE deepstack merging when interleaved video/audio inputs also contain image placeholders.

When use_audio_in_video=True, the interleaved path builds the deepstack vision mask from video tokens only:

is_vision = is_video.clone()

That misses image token positions when a request also contains images, for example images inserted in tool responses. The deepstack multimodal merge then sees fewer vision placeholders than vision embeddings and can fail with:

ValueError: Attempted to assign N+M multimodal tokens to N placeholders

This patch includes image_token_id positions in the interleaved is_vision mask, matching the behavior of the non-interleaved path where both image and video embeddings are marked as vision positions.

Changes

• Include image placeholder positions in the Qwen3-Omni-MoE interleaved deepstack vision mask.
• Leave audio positions excluded from the vision mask.
• Confirmed vllm/model_executor/models/qwen3_omni_thinker.py is not present on the upstream default branch, so only the MoE thinker file is patched.

Validation

• Inspected the upstream default branch implementation.
• Verified the target line is in vllm/model_executor/models/qwen3_omni_moe_thinker.py.
• Could not run the full test suite in this environment because the local shell cannot connect to GitHub to clone the repository.

cc @huachenheli @linyueqian @Isotr0py @ywang96

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[ywang96]

Thanks for the contribution - it seems that @wendadawen are both working on this issue - could you collaborate?

[wendadawen]

@ywang96 @harris26-G This fix does not seem to be comprehensive, and crashes still occur in some test cases. For instance, when use_audio_in_video=True and image + video (where the image comes first). For more details, please refer to #46213

[harris26-G]

Thanks for the pointer. I’ll sync with @wendadawen and check how to best collaborate or avoid duplicated work. wendadawen ***@***.***> 于2026年6月22日周一 13:11写道：

…

*wendadawen* left a comment (vllm-project/vllm#46058) <#46058 (comment)> @ywang96 <https://github.com/ywang96> @harris26-G <https://github.com/harris26-G> This fix does not seem to be comprehensive, and crashes still occur in some test cases. For instance, when use_audio_in_video=True and image + video (where the image comes first). For more details, please refer to #46213 <#46213> — Reply to this email directly, view it on GitHub <#46058?email_source=notifications&email_token=BUQAV2PKUKFONUSDKEEA3FT5BC5ZLA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGUYTANRZG4YKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4765106970>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BUQAV2IYOVZFGFZJGVR3SAT5BC5ZLAVCNFSNUABFKJSXA33TNF2G64TZHM2TSOJVGQ3TKMJYHNEXG43VMU5TINRZGMYDSOBTGMYKC5QC> . 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/BUQAV2MBKFCJYGJ5CRSQ7A35BC5ZLA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGUYTANRZG4YKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/BUQAV2K5RWTXYH6JNMRWILD5BC5ZLA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGUYTANRZG4YKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>

[harris26-G]

Thanks for the clarification. I have synced with @wendadawen, and we agreed to continue with #46213 as the main PR since it covers the broader interleaved image/video/audio cases more comprehensively. I’ll help incorporate any useful parts from this PR into #46213 if needed, and we’ll make sure the final patch includes proper co-author credit for both of us. Please let us know if this direction works for you.

…

Message ID: ***@***.***> >

[harris26-G]

Thanks for the clarification. I have synced with @wendadawen, and we agreed to continue with #46213 as the main PR since it covers the broader interleaved image/video/audio cases more comprehensively. I’ll help incorporate any useful parts from this PR into #46213 if needed, and we’ll make sure the final patch includes proper co-author credit for both of us. Please let us know if this direction works for you. Roger Wang ***@***.***> 于2026年6月22日周一 12:29写道：

…

*ywang96* left a comment (vllm-project/vllm#46058) <#46058 (comment)> Thanks for the contribution - it seems that @wendadawen <https://github.com/wendadawen> are both working on this issue - could you collaborate? — Reply to this email directly, view it on GitHub <#46058?email_source=notifications&email_token=BUQAV2MDRB7DDNY2MX6L5BL5BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4764848263>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BUQAV2J3MHRQXGXKMPOEDYD5BCY4LAVCNFSNUABFKJSXA33TNF2G64TZHM2TSOJVGQ3TKMJYHNEXG43VMU5TINRZGMYDSOBTGMYKC5QC> . 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/BUQAV2OKWN6JMSUZKOYS5ML5BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/BUQAV2MOWWEPUTQUMJH53C35BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[harris26-G]

@ywang96 <https://github.com/ywang96> Thanks for the clarification. I have synced with @wendadawen, and we agreed to continue with #46213 as the main PR since it covers the broader interleaved image/video/audio cases more comprehensively. I’ll help incorporate any useful parts from this PR into #46213 if needed, and we’ll make sure the final patch includes proper co-author credit for both of us. Please let us know if this direction works for you. Hanze Guo ***@***.***> 于2026年6月25日周四 15:54写道：

…

Thanks for the clarification. I have synced with @wendadawen, and we agreed to continue with #46213 as the main PR since it covers the broader interleaved image/video/audio cases more comprehensively. I’ll help incorporate any useful parts from this PR into #46213 if needed, and we’ll make sure the final patch includes proper co-author credit for both of us. Please let us know if this direction works for you. Roger Wang ***@***.***> 于2026年6月22日周一 12:29写道： > *ywang96* left a comment (vllm-project/vllm#46058) > <#46058 (comment)> > > Thanks for the contribution - it seems that @wendadawen > <https://github.com/wendadawen> are both working on this issue - could > you collaborate? > > — > Reply to this email directly, view it on GitHub > <#46058?email_source=notifications&email_token=BUQAV2MDRB7DDNY2MX6L5BL5BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4764848263>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BUQAV2J3MHRQXGXKMPOEDYD5BCY4LAVCNFSNUABFKJSXA33TNF2G64TZHM2TSOJVGQ3TKMJYHNEXG43VMU5TINRZGMYDSOBTGMYKC5QC> > . > 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/BUQAV2OKWN6JMSUZKOYS5ML5BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> > and Android > <https://github.com/notifications/mobile/android/BUQAV2MOWWEPUTQUMJH53C35BCY4LA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWGQ4DIOBSGYZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. > Download it today! > You are receiving this because you authored the thread.Message ID: > ***@***.***> >