error: queries overflow the depth limit! with 1.94.0

[mat813]

My Cargo.toml line for matrix-sdk is:

matrix-sdk = { version = "=0.16.0", features = [
  "eyre",
  "markdown",
  "e2e-encryption",
  "automatic-room-key-forwarding",
  "sqlite",
  "bundled-sqlite",
  "rustls-tls",
  "experimental-search"
], default-features = false }

When I run cargo build, I get:

$ cargo version -v
cargo 1.94.0 (85eff7c80 2026-01-15)
release: 1.94.0
commit-hash: 85eff7c80277b57f78b11e28d14154ab12fcf643
commit-date: 2026-01-15
host: x86_64-unknown-linux-gnu
libgit2: 1.9.2 (sys:0.20.3 vendored)
libcurl: 8.17.0-DEV (sys:0.4.84+curl-8.17.0 vendored ssl:OpenSSL/3.5.4)
ssl: OpenSSL 3.5.4 30 Sep 2025
os: Ubuntu 22.4.0 (jammy) [64-bit]               

$ cargo build
   Compiling matrix-sdk v0.16.0
error: queries overflow the depth limit!
  |
  = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`matrix_sdk`)
  = note: query depth increased by 130 when computing layout of `{async fn body of client::<impl at /home/mat/.local/share/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/matrix-sdk-0.16.0/src/client/mod.rs:488:1: 488:12>::sync()}`

error: could not compile `matrix-sdk` (lib) due to 1 previous error

[cajus]

I'm seeing the same problem when compiling a flatpak. Pinning the flatpak rust sdk to a pre 1.94.0 version temporarily works.

refs: rust-lang/rust#152942

[flaxeneel2]

can confirm, exact same code compiles on 1.93.0 just fine. downgrading seems like a valid workaround

[Hywan]

We are aware of the problem, and we are trying to find a workaround, or a fix for that.