[llvm-bugs] [Bug 48380] New: lld: Possible race condition writing files to lto cache

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48380

            Bug ID: 48380
           Summary: lld: Possible race condition writing files to lto
                    cache
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: tstellar at redhat.com
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com

With lld 11.0.0, I am seeing these lit tests fail when running in a container
(very slow disk IO):

  lld :: COFF/lto-cache.ll
  lld :: ELF/lto/cache.ll
  lld :: wasm/lto/cache.ll

These tests are failing, because no objects are being written to the cache
directory.  While debugging I noticed if I manually ran the lld commands that
are supposed to generate the cache files and passed the -verbose option to it,
then the cache objects get written.  If I remove the -verbose option, then the
cache objects are not written.

This makes me suspect there is some kind of race condition, so either the
program is exiting before the files are completely written or the cache is
getting pruned after the objects are written.

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