Invalid memory access (signal 11) at address 0x20

[Sija]

Bug Report

I just had a pretty random crash of my server running gphoto2-web (built using shards build --release -Dpreview_mt):

Invalid memory access (signal 11) at address 0x20
[0x102c94bd0] print_backtrace at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/exception/call_stack/libunwind.cr:100:5
[0x102c94698] -> at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/crystal/system/unix/signal.cr:171:5
[0x1b04774a4] _sigtramp +56 in /usr/lib/system/libsystem_platform.dylib
[0x103b0ac10] GC_finish_collection +2228 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x103b05e98] GC_try_to_collect_inner +404 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x103b0e29c] GC_collect_or_expand +220 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x103afc3ac] GC_generic_malloc_inner +860 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x103b02930] GC_generic_malloc_many +1124 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x103b01360] GC_malloc_kind +180 in /opt/homebrew/Cellar/bdw-gc/8.2.8/lib/libgc.1.5.4.dylib
[0x102cca2fc] parse_header at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/pointer.cr:519:11
[0x102d36d14] read_header_line at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/http/common.cr:114:15
[0x102da4ba4] handle_client at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/http/common.cr:33:11
[0x102c96e74] run at /opt/homebrew/Cellar/crystal/1.13.2/share/crystal/src/fiber.cr:143:11

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Crystal 1.13.2 (2024-08-20)

LLVM: 18.1.8
Default target: aarch64-apple-darwin21.6.0