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Alexandru Ardelean
927fc5ea54
Each output flush runs in a coroutine whose stack was forced to 4096 (one page). The HTTP output plugin overflows it and crashes with SIGSEGV after the flush (issue #30113). Pin FLB_CORO_STACK_SIZE to upstream's own 64K floor (FLB_CORO_STACK_SIZE_MIN_BYTE), which the musl-shrunk default undercuts. Also add a regression test: drive the dummy input into the http output and assert fluent-bit survives a few flush cycles instead of dying from a signal (no listener needed -- the overflow happens while composing the request). Fixes: https://github.com/openwrt/packages/issues/30113 Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>
47 lines
1.3 KiB
Bash
Executable File
47 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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# Regression test for issue #30113: with too small a coroutine stack the HTTP
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# output plugin overflows and dies (SIGSEGV/abort) on its first flush. Drive the
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# dummy input into the http output and make sure fluent-bit survives a few flush
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# cycles. No server is needed -- the crash happens while composing/sending the
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# request, so a refused local port is enough to exercise it.
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case "$1" in
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fluent-bit) ;;
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*) exit 0 ;;
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esac
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BIN=/usr/sbin/fluent-bit
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[ -x "$BIN" ] || { echo "FAIL: $BIN not installed"; exit 1; }
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cfg=/tmp/fluent-bit-http.conf
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cat > "$cfg" <<'EOF'
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[SERVICE]
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flush 1
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daemon off
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log_level error
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[INPUT]
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name dummy
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dummy {"message":"regress-30113"}
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rate 100
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[OUTPUT]
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name http
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match *
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host 127.0.0.1
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port 5170
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format json
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EOF
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# A healthy run keeps retrying the refused endpoint until timeout stops it
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# (rc 124); a coroutine-stack overflow dies from a signal (rc >= 128) within
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# the first flush cycle.
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timeout 6 "$BIN" -c "$cfg" >/tmp/fluent-bit-http.out 2>&1
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rc=$?
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if [ "$rc" -ge 128 ]; then
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echo "FAIL: fluent-bit http output died from a signal (rc=$rc) -- coro stack too small"
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grep -iE 'signal|SIGSEGV' /tmp/fluent-bit-http.out | head -1
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exit 1
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fi
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echo "fluent-bit: http output survived flush cycles (rc=$rc)"
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