[NFC][scudo] Add reference to a QEMU bug

D101031 added workaround for the bug.
2021-04-28 14:56:08 -07:00 · 2021-04-28 14:56:08 -07:00 · f7164c7714
parent c3846bcfe1
commit f7164c7714
1 changed files with 1 additions and 0 deletions
--- a/compiler-rt/lib/scudo/standalone/linux.cpp
+++ b/compiler-rt/lib/scudo/standalone/linux.cpp
@ -122,6 +122,7 @@ void releasePagesToOS(uptr BaseAddress, uptr Offset, uptr Size,
  if (madviseNeedsMemsetCached()) {
    // Workaround for QEMU-user ignoring MADV_DONTNEED.
    // https://github.com/qemu/qemu/blob/b1cffefa1b163bce9aebc3416f562c1d3886eeaa/linux-user/syscall.c#L11941
+    // https://bugs.launchpad.net/qemu/+bug/1926521
    memset(Addr, 0, Size);
  }
  while (madvise(Addr, Size, MADV_DONTNEED) == -1 && errno == EAGAIN) {