Your system information

• Steam client version (build number or date): 1779918128, Wed, May 27, 2026 5:21 PM UTC -08:00
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2

Please describe your issue in as much detail as possible:

When I attempt to stream a game from the computer described above as host, to another computer on the LAN also logged in on my account (not Steam Link or Remote Play Together, neither of those work either but that's been the case for a while and is not the issue I'm currently describing), the host's Steam instance crashes and immediately restarts. This occurs shortly after the game to be streamed starts up on the host side, while in the stream-loading splash screen (the one tiled with the game's art). When I do this after opening Steam through the terminal so as to watch stdout/stderr, nothing is logged on the client side. On the host side, at the time of the crash, the following is logged without any preceding error:

crash_20260530184548_39.dmp[36650]: Uploading dump (out-of-process)
/tmp/dumps/crash_20260530184548_39.dmp
crash_20260530184548_39.dmp[36650]: Finished uploading minidump (out-of-process): success = yes
crash_20260530184548_39.dmp[36650]: response: CrashID=bp-42e6a7ca-2ed4-4680-8451-bbebd2260530
crash_20260530184548_39.dmp[36650]: file ''/tmp/dumps/crash_20260530184548_39.dmp'', upload yes: ''CrashID=bp-42e6a7ca-2ed4-4680-8451-bbebd2260530''
src/common/pipes.cpp (900) : fatal stalled cross-thread pipe (pipe is disconnected).
src/common/pipes.cpp (900) : fatal stalled cross-thread pipe (pipe is disconnected).
src/common/pipes.cpp (900) : Fatal assert; application exiting
/home/qwertystop/.local/share/Steam/steam.sh: line 966: 34092 Segmentation fault         (core dumped) "$STEAMROOT/$STEAMEXEPATH" "$@"
05/30 18:45:52 minidumps folder is set to /tmp/dumps
05/30 18:45:52 Init: Installing breakpad exception handler for appid(gameoverlayui)/version(1.0)/tid(36629)
assert_20260530184552_3.dmp[36743]: Uploading dump (out-of-process)
/tmp/dumps/assert_20260530184552_3.dmp
assert_20260530184552_3.dmp[36743]: Finished uploading minidump (out-of-process): success = yes
assert_20260530184552_3.dmp[36743]: response: Discarded=1
assert_20260530184552_3.dmp[36743]: file ''/tmp/dumps/assert_20260530184552_3.dmp'', upload yes: ''Discarded=1''
src/common/pipes.cpp (900) : fatal stalled cross-thread pipe (pipe is disconnected).
src/common/pipes.cpp (900) : Fatal assert; application exiting
05/30 18:45:53 minidumps folder is set to /tmp/dumps
05/30 18:45:53 Failed writing minidump, nothing to upload.

This occurs for every game I try to stream, and all of these games work properly on the host machine when not attempting to stream.

This began occurring on 2026-05-29. Previously, I streamed various games between these two machines every few days without error, most recently on the 28th. The host machine had not had any software updates run between the last successful and first unsuccessful stream. The client machine is capable of streaming Steam games from a different host machine on the same local network.

The above occurs consistently over many attempts, with a single exception, in which the crash occurred before the game started up, accompanied by an error popup reading "Unable to initialize SteamAPI. Please make sure Steam is running and you are logged in to an account entitled to the game."

Steps for reproducing this issue:

1. Start Steam on both host and client machines.
2. On client machine, click the "Stream" button that appears in place of the usual "Play" button once Steam is started on the host and recognized by the client.
3. Wait for the game to start-and-crash.