Cannot allocate Wasm memory

[RogueJester]

I keep getting this issue,

RangeError: WebAssembly.instantiate():
Out of memory: Cannot allocate Wasm memory

I am attempting to and Tunarr to my VM.

[XNinety9]

Tunarr itself has no WebAssembly. That error comes from Node.js, which Tunarr runs on: Node's built-in HTTP client (undici, behind fetch) loads its HTTP parser as a WebAssembly module, and V8 reserves extra virtual address space for Wasm memory. When the system refuses that reservation, you get Out of memory: Cannot allocate Wasm memory, even with free RAM.

So it usually points to a memory or address-space limit in the VM, not to Tunarr. Things to check inside it:

ulimit -v                         # should print "unlimited"
cat /proc/sys/vm/overcommit_memory  # 2 = strict accounting, which commonly breaks this
uname -m                          # x86_64 / aarch64 expected; a 32-bit userland (armv7l, i686) has too little address space
free -h

• ulimit -v set to a number: remove the limit for the Tunarr process (LimitAS=infinity in a systemd unit, or don't set ulimit -v in the startup script).
• vm.overcommit_memory = 2: set it back to the default 0 (sysctl -w vm.overcommit_memory=0, and in /etc/sysctl.d/ to keep it), or raise vm.overcommit_ratio / add swap.
• 32-bit OS: use a 64-bit image. This is common on Raspberry Pi OS and some NAS VMs.
• Very small VM (under ~1 GB RAM with no swap): give it more memory or some swap.

If none of these apply, post the output of those four commands plus how Tunarr is run (Docker, binary, Proxmox LXC…) and the Tunarr version.