"No session available" errors written to kernel console log repeatedly

[basak-qcom]

FastRPC version

v1.0.6

DSP firmware version

ADSP.HT.5.5.c8-00249.1-KODIAK-1 (unsure, from firmware-qcom-dsp 0~20260622-1 on Debian)

SoC and device name

RB3gen2 with vision kit

Kernel version

7.1.8+deb14-arm64 from Debian

What happened?

I get Aug 24 08:20:11 debian kernel: qcom,fastrpc 3700000.remoteproc:glink-edge.fastrpcglink-apps-dsp.-1.-1: No session available printed every few seconds to the kernel console

If I run sudo systemctl stop adsprpcd_audiopd.service then the problem stops, and it resumes on service restart.

I'm not sure if this is packaging problem or an upstream issue, but it happens with the currently packaged 1.0.6-2 as well as my packaging in progress for 1.0.7 in qualcomm-linux/pkg-fastrpc#87

"Invalid domain name" suggests that perhaps it's incorrect to try to start the service in this case? But the systemd service definitions are being generated by the upstream build now.

Steps to reproduce

1. Flash from qcom-deb-images. I used the image from this build: https://github.com/qualcomm-linux/qcom-deb-images/actions/runs/32473746733
2. apt install --update libfastrpc1 fastrpc-support
3. Observe kernel messages dumped to serial, or run journalctl -kf

Relevant log output

Aug 24 08:47:46 debian systemd[1]: Starting adsprpcd_audiopd.service - audiopd aDSP RPC daemon...
Aug 24 08:47:46 debian systemd[1]: Started adsprpcd_audiopd.service - audiopd aDSP RPC daemon.
Aug 24 08:47:46 debian adsprpcd[1772]: dsprpcd.c:176:ADSP daemon starting
Aug 24 08:47:46 debian adsprpcd[1772]: rpcmem_linux.c:98: Warning 2: Unable to open /dev/dma_heap/system, falling back to fastrpc ioctl
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-arduino-monza.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-db820c.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-glymur-crd.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-hamoa-iot-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-iq8275-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-iq9075-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-kaanapali-mtp.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-purwa-iot-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-qcm6490-idp.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-qcs615-ride.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-qcs8300-ride.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-sa8775p-ride.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-sdm845-hdk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-shikra-cqm-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-shikra-cqs-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-shikra-iqs-evk.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-qualcomm-sm8750-mtp.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-radxa-dragon-q6a.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-thundercomm-db845c.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-thundercomm-rb1.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-thundercomm-rb2.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:93: dsp_lib_paths is qcm6490/Thundercomm/RB3gen2/dsp
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-thundercomm-rb5.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_config_parser.c:123: Warning: DSP_LIBRARY_PATH not found for machine [Qualcomm Technologies, Inc. Robotics RB3gen2] in configuration file /usr/share/hexagon-dsp/conf.d/hexagon-dsp-binaries-thundercomm-rubikpi3.yaml
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3975: fastrpc_apps_user_init done. default domain:0 and &fastrpc_trace:0xffff813d25f0
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:4096: multidsplib_env_init: libadsprpc.so loaded
Aug 24 08:47:46 debian adsprpcd[1772]: dsprpcd.c:183:adsp_default_listener_start called
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:2888: Invalid domain name: audiopd
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:1686: remote_handle_open: Successfully opened handle 0x101 for '":;./\createstaticpd:audiopd on domain 0 (spawn time 0 us, load time 0 us)
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3116: Error 0x0: open_device_node failed for domain ID 0, sess ID 0 secure dev : /dev/fastrpc-adsp-secure, dev : /dev/fastrpc-adsp. (errno 16, Device or resource busy) (Either the remote processor is down, or application does not have permission to access the r
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_cap.c:126: Warning 0x72: fastrpc_get_cap failed to get attribute 131 for domain 0 (errno Device or resource busy)
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3116: Error 0x0: open_device_node failed for domain ID 0, sess ID 0 secure dev : /dev/fastrpc-adsp-secure, dev : /dev/fastrpc-adsp. (errno 16, Device or resource busy) (Either the remote processor is down, or application does not have permission to access the r
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3601: Error 0x72: remote_init failed for domain 0, errno Device or resource busy, ioErr 0
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3817: Error 0x72: domain_init (-1) failed for domain 0 (errno Device or resource busy)
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3116: Error 0x0: open_device_node failed for domain ID 0, sess ID 0 secure dev : /dev/fastrpc-adsp-secure, dev : /dev/fastrpc-adsp. (errno 16, Device or resource busy) (Either the remote processor is down, or application does not have permission to access the r
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_cap.c:126: Warning 0x72: fastrpc_get_cap failed to get attribute 257 for domain 0 (errno Device or resource busy)
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:1682: Error 0x72: remote_handle_open failed for adsp_default_listener (errno Device or resource busy)
Aug 24 08:47:46 debian adsprpcd[1772]: adsp_default_listener.c:303::error: 114: 0 == (nErr = remote_handle_open("adsp_default_listener", (remote_handle *)&listener_fd))
Aug 24 08:47:46 debian adsprpcd[1772]: adsp_default_listener.c:369:Error 0x72: adsp_default_listener_start exiting
Aug 24 08:47:46 debian adsprpcd[1772]: fastrpc_apps_user.c:3870: fastrpc_apps_user_deinit done
Aug 24 08:47:46 debian systemd[1]: adsprpcd_audiopd.service: Main process exited, code=exited, status=114/n/a
Aug 24 08:47:46 debian adsprpcd[1772]: dsprpcd.c:194:fastRPC device is not accessible, daemon exiting...
Aug 24 08:47:46 debian adsprpcd[1772]: dsprpcd.c:206:daemon exiting 72
Aug 24 08:47:46 debian systemd[1]: adsprpcd_audiopd.service: Failed with result 'exit-code'.
Aug 24 08:47:49 debian systemd[1]: Stopped adsprpcd_audiopd.service - audiopd aDSP RPC daemon.

[ekanshibu]

The "No session available" problem is seen when there is no compute session available. On RB3Gen2, 3 ADSP sessions are available. We are working on supporting context bank extension from driver: https://lore.kernel.org/all/20260708-dup-sessions-v2-0-da40f9c98a2b@oss.qualcomm.com/

Once this support is enabled, the issue should be resolved.

[basak-qcom]

Thanks Ekansh Gupta (@ekanshibu) ! Is there anything we could do to stop spamming kernel logs in the meantime please? These are being logged every few seconds, so effectively hide everything else.

[ekanshibu]

I believe such logs should either be rate-limited or set to debug level. Let me try updating this on kernel.

[quic-bkumar]

how do we know if any session is available or still limited, if the message is set to debug?

[ekanshibu]

how do we know if any session is available or still limited, if the message is set to debug?

We can rely on error code, driver returns -EBUSY only if the sessions are not available. Other than that, we can explore rate-limiting this error log.