Zig Version 0.12.0-dev.2928+6fddc9cd3 Steps to

Segmentation fault when using a returned `std.fifo.LinearFifo.writer().any()` about zig HOT 2 CLOSED

deanveloper commented on May 29, 2024

Segmentation fault when using a returned `std.fifo.LinearFifo.writer().any()`

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Comments (2)

nektro commented on May 29, 2024 2

(please include the code in the issue instead of linking a gist)

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ianprime0509 commented on May 29, 2024 1

This isn't so much a bug as a footgun: the any function takes a *const Self parameter (referring to the writer), which is stored in the AnyWriter as its context:

zig/lib/std/io.zig

Lines 345 to 350 in 90c1a2c

 pub inline fn any(self: *const Self) AnyWriter { 

 return .{ 

 .context = @ptrCast(&self.context), 

 .writeFn = typeErasedWriteFn, 

 }; 

 }

Hence, not only does the LinearFifo have to remain alive, but also the GenericWriter returned by writer, making return self.fifo.writer().any() invalid. The analogous scenario for GenericReader's any function is #17458.

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Segmentation fault when using a returned `std.fifo.LinearFifo.writer().any()` about zig HOT 2 CLOSED

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	pub inline fn any(self: *const Self) AnyWriter {
	return .{
	.context = @ptrCast(&self.context),
	.writeFn = typeErasedWriteFn,
	};
	}