Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/plumb-stacksize/readme

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Fix stack size in plumb.

Increasing the stack size to 16KB prevents the plumber
to crash in some situations on the AMD64 kernel.

112.4 (*t)->magic == FREE_MAGIC: assertion failed
plumber 112: suicide: sys: trap: fault read addr=0x0 pc=0x20c5ec

Erik Quanstrom did the original fix.

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