Using PkarrPublisher on the macOS platform in release mode causes a segmentation fault.

[zh522130]

Environment:

• Operating System: macOS
• Architecture: x64_64
• Rust Version: 1.82.0 (This probably doesn't matter, as the issue existed before the upgrade)

How to reproduce?

Use .discovery_n0() in Endpoint::builder() for any iroh-net example, and run the example in release mode on macOS.

Commenting out the following code in discovery_n0 avoids the segmentation fault:

self.discovery.push(Box::new(|secret_key| {
    Some(Box::new(PkarrPublisher::n0_dns(secret_key.clone())))
}));

Log

Log information when a segmentation fault occurs while running with lldb:

Process 14835 stopped
* thread #15, name = 'tokio-runtime-worker', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
    frame #0: 0x000000010091c30f listen`_$LT$simple_dns..dns..rdata..RData$u20$as$u20$simple_dns..dns..packet_part..PacketPart$GT$::parse::hf633f606481706d4 at macros.rs:172:13 [opt]
   169                  TYPE::Unknown(rdatatype) => RData::NULL(rdatatype, NULL::parse(data, position)?),
   170              };
   171 
-> 172              Ok(rdata)
   173          }
   174 
   175 
Target 0: (listen) stopped.
warning: listen was compiled with optimization - stepping may behave oddly; variables may not be available.

[zh522130]

I tested it on macOS based on Apple Silicon (M4), and the results were consistent with x64.

[dignifiedquire]

you are saying it segfaults on arm as well? that’s very surprising, as I am using this actively on macos arm and we run full ci on that

[dignifiedquire]

are you by any chance cross compiling? or are you building on the target machines directly?

[zh522130]

segfaults

I apologize for the confusion. After retesting on the M4, I realized there was no issue. My initial mistake was due to wrapping iroh-net for Flutter, where Rust segfaults don't crash the app. Seeing errors on the M4 from iroh-net led to my incorrect judgment. The issue might be related to my own code, and I need to investigate further.

[dignifiedquire]

no worries, appreciate the update. let us know what you find

[zh522130]

I tested with the latest master code on x64 macos, and the segmentation fault still occurs.

[Arqu]

For what it's worth, I encountered the same issue in my own playing around. Though its on Linux x64.
This happened on the iroh-dns-server, but also managed to produce it client side similar to what the original post outlined. I'll try dive deeper on this.