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Increase the sigaltstack stack size #4964

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Merged
alexcrichton merged 1 commit into from
Sep 26, 2022
Merged

Increase the sigaltstack stack size #4964

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9 changes: 8 additions & 1 deletion crates/runtime/src/traphandlers/unix.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -286,7 +286,14 @@ pub fn lazy_per_thread_init() {

/// The size of the sigaltstack (not including the guard, which will be
/// added). Make this large enough to run our signal handlers.
const MIN_STACK_SIZE: usize = 16 * 4096;
///
/// The main current requirement of the signal handler in terms of stack
/// space is that `malloc`/`realloc` are called to create a `Backtrace` of
/// wasm frames.
///
/// Historically this was 16k. Turns out jemalloc requires more than 16k of
/// stack space in debug mode, so this was bumped to 64k.
const MIN_STACK_SIZE: usize = 64 * 4096;

struct Stack {
mmap_ptr: *mut libc::c_void,
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