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Subject: [Bug 217239] head (e.g.:) -r313864 arm64 vs. jemalloc without
 MALLOC_PRODUCTION: various examples of tbin->avail being zero lead to
 SIGSEGV's
Date: Mon, 20 Feb 2017 21:30:35 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217239

--- Comment #6 from Mark Millard <markmi@dsl-only.net> ---
It turns out that for the script and powerd examples the whole
tsd->tcache[0] through tsd->tcache[40] area (__je_nhbins=3D=3D41) is
all zeros. That includes the lg_fill_div members of each.

For the su examples there is a next_gc_bin in
tsd->tcache[2] that is non-zero:

print/x tsd->tcache[2]
(lldb) print/x tsd->tcache[2]
(tcache_t) $1 =3D {
  link =3D {
    qre_next =3D 0x0000000000000000
    qre_prev =3D 0x0000000000000000
  }
  prof_accumbytes =3D 0x0000000000000000
  gc_ticker =3D (tick =3D 0x00000000, nticks =3D 0x00000000)
  next_gc_bin =3D 0xffffffff
  tbins =3D {
    [0] =3D {
      tstats =3D (nrequests =3D 0x0000000000000000)
      low_water =3D 0x00000000
      lg_fill_div =3D 0x00000000
      ncached =3D 0x00000000
      avail =3D 0x0000000000000000
    }
  }
}

But the rest of the tsd->tcache area is zero.

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