[Qemu-devel] [Bug 1603734] [NEW] Hang in fsqrt

[Robert Femmer]

Public bug reported:

At least qemu-i368 and qemu-x86_64 hang in floatx80_sqrt in versions
2.6.0 and git (2.6.50) for some input values, likely due to an infinite
loop at fpu/softfloat.c:6569.

Steps to reproduce:
1) Compile attached code: gcc -o test test.c -lm
2) `qemu-i368 test` and `qemu-x86_64 test` will hang at 100% cpu

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "minimal example"
   https://bugs.launchpad.net/bugs/1603734/+attachment/4702260/+files/test.c

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https://bugs.launchpad.net/bugs/1603734

Title:
  Hang in fsqrt

Status in QEMU:
  New

Bug description:
  At least qemu-i368 and qemu-x86_64 hang in floatx80_sqrt in versions
  2.6.0 and git (2.6.50) for some input values, likely due to an
  infinite loop at fpu/softfloat.c:6569.

  Steps to reproduce:
  1) Compile attached code: gcc -o test test.c -lm
  2) `qemu-i368 test` and `qemu-x86_64 test` will hang at 100% cpu

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