[Bug c/21973] New: Segfault in GTK+ compiled with -march=pentium4 when used through JNI

["vektor at dumbterm dot net" <gcc-bugzilla at gcc dot gnu dot org>]

I have discussed this issue with Andrew Pinski on IRC, but I figured it should
be logged here as well.

I have been investigating some crashes in Eclipse, a Java application which uses
GTK+.  The crashes are reproducable using the Sun 1.5 VM when GTK+ is compiled
with -march=pentium4, and go away with -march=pentium3 or -march=pentium4
-mno-sse2.  gcc 3.4.x.

Below are the registers and a disassembly I extracted from the bytes of the code
at the current PC (this information is included in the VM crash logs).  Note
that ESP is not properly aligned.  Andrew's theory on IRC was that this is a
duplicate of bug 10395, and may be caused by the Sun VM not aligning its stack
when calling into JNI code.

Are there any other options?  Does the disassembly of the instructions below
provide any further insight or help to confirm this theory?

Crash 1:
  EAX=0x00000001, EBX=0x4e4888e4, ECX=0x0859fb38, EDX=0x0859eda8
  ESP=0xbfffb32c, EBP=0x083b2270, ESI=0x0859fae8, EDI=0x4e3a2cd6
  EIP=0x4e3a2b3d, CR2=0x00000000, EFLAGS=0x00210202

  00894424   add [bx+di+2444],cl
  08F2       or dl,dh
  0F108B6C6F movups xmm1,[bp+di+6F6C]
  F6FF       idiv (b) bh
  8B5124     mov dx,[bx+di+24]
  660F294C24 movapd [si+24],xmm1
  10F2       adc dl,dh
  0F105220   movups xmm2,[bp+si+20]
  660F57D1   xorpd xmm2,xmm1
  F2         ...

Crash 2:
  EAX=0x08486ef8, EBX=0x4e454880, ECX=0x4e577bd5, EDX=0x08480f70
  ESP=0xbfffaddc, EBP=0x08480da0, ESI=0x08480df0, EDI=0x08480da0
  EIP=0x4e373c03, CR2=0x00000000, EFLAGS=0x00210202

  00894424   add [bx+di+2444],cl
  08F2       or dl,dh
  0F108B5063 movups xmm1,[bp+di+6350]
  F6FF       idiv (b) bh
  8B4624     mov ax,[bp+24]
  660F294C24 movapd [si+24],xmm1
  10F2       adc dl,dh
  0F105020   movups xmm2,[bx+si+20]
  660F57D1   xorpd xmm2,xmm1
  F2         ...

Crash 3 and 4:
  EAX=0x00000017, EBX=0xb14bd1d8, ECX=0x086c3db8, EDX=0x086c9860
  ESP=0xbfffbb24, EBP=0xbfffbb9c, ESI=0x086c99d0, EDI=0x086c3db8
  EIP=0xb13c7b4d, CR2=0x00000008, EFLAGS=0x00010202

  00894424   add [bx+di+2444],cl
  08F2       or dl,dh
  0F108B283E movups xmm1,[bp+di+3E28]
  F6FF       idiv (b) bh
  8B4A24     mov cx,[bp+si+24]
  660F294DA8 movapd [di-58],xmm1
  F20F105120 movsd xmm2,[bx+di+20]
  660F57D1   xorpd xmm2,xmm1
  F20F       ...

The Eclipse bug is here:
  https://bugs.eclipse.org/bugs/show_bug.cgi?id=79618

-- 
           Summary: Segfault in GTK+ compiled with -march=pentium4 when used
                    through JNI
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vektor at dumbterm dot net
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21973