[Bug 1874888] [NEW] certain programs make QEMU crash with "tcg fatal error"

[Konstantin]

Public bug reported:

The following code snippet crashes qemu with

.../tcg/tcg.c:3279: tcg fatal error
qemu-x86_64: 
/usr/local/google/home/kostik/qemu-5.0.0-rc4/accel/tcg/cpu-exec.c:701: int 
cpu_exec(CPUState *): Assertion `!have_mmap_lock()' failed.

================
int main() {
  /*
00000000 <.data>:
   0:   2e 45 71 ff             cs rex.RB jno 0x3
   4:   e9 00 00 f0 00          jmp    0xf00009
   9:   c4 42 7d 31 3e          vpmovzxbd ymm15,QWORD PTR [r14]
   e:   c4 a3 7d 08 64 82 44    vroundps ymm4,YMMWORD PTR [rdx+r8*4+0x44],0x0
  15:   00 
  16:   0f 1e 0a                nop    DWORD PTR [rdx]
  19:   43 0f ec 20             rex.XB paddsb mm4,QWORD PTR [r8]
  1d:   66 47 0f 3a 0c 3d 00    rex.RXB blendps xmm15,XMMWORD PTR 
[rip+0x8000],0x0        # 0x8028
  24:   80 00 00 00 
  28:   c4 e3 f9 df 5f 86 0d    vaeskeygenassist xmm3,XMMWORD PTR [rdi-0x7a],0xd
  2f:   c4 e2 55 92 74 fc 0a    vgatherdps ymm6,DWORD PTR [rsp+ymm7*8+0xa],ymm5
  36:   c4 e2 f9 17 9a 01 00    vptest xmm3,XMMWORD PTR [rdx+0x1]
  3d:   00 00 
*/
  char buf[] = {
    0x2E, 0x45, 0x71, 0xFF, 0xE9, 0x00, 0x00, 0xF0, 0x00, 0xC4, 0x42, 0x7D, 
0x31, 0x3E, 0xC4, 0xA3, 0x7D, 0x08, 0x64, 0x82, 0x44, 0x00, 0x0F, 0x1E, 0x0A, 
0x43, 0x0F, 0xEC, 0x20, 0x66, 0x47, 0x0F, 0x3A, 0x0C, 0x3D, 0x00, 0x80, 0x00, 
0x00, 0x00, 0xC4, 0xE3, 0xF9, 0xDF, 0x5F, 0x86, 0x0D, 0xC4, 0xE2, 0x55, 0x92, 
0x74, 0xFC, 0x0A, 0xC4, 0xE2, 0xF9, 0x17, 0x9A, 0x01, 0x00, 0x00, 0x00
  };
  void (*f)(void) = (void (*) (void))buf;
  f();
  return 0;
}
================
Steps to reproduce:
1) clang -static repro.c -o repro
2) qemu-x86_64-static repro

Tested with 4.2.0 and 5.0.0-rc4. Both -user and -system variants are
affected.

A few more snippets that cause the same sort of behavior:
1) 0x64, 0x46, 0x7D, 0xFF, 0xDF, 0x27, 0x46, 0x0F, 0xD4, 0x83, 0x5E, 0x00, 
0x00, 0x00, 0x3E, 0x0F, 0x6A, 0xEF, 0x0F, 0x05, 0xC4, 0x42, 0xFD, 0x1E, 0xCF, 
0x46, 0x18, 0xE3, 0x47, 0xCD, 0x4E, 0x6E, 0x0F, 0x0F, 0x16, 0x8A

2) 0x67, 0x45, 0xDB, 0xD0, 0xAA, 0xC4, 0xE2, 0xB1, 0x01, 0x57, 0x00,
0xF3, 0x6F, 0xF3, 0x42, 0x0F, 0x1E, 0xFD, 0x64, 0x2E, 0xF2, 0x45, 0xD9,
0xC4, 0x3E, 0xF3, 0x0F, 0xAE, 0xF4, 0x3E, 0x47, 0x0F, 0x1C, 0x22, 0x42,
0x73, 0xFF, 0xD9, 0xFD

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1874888

Title:
  certain programs make QEMU crash with "tcg fatal error"

Status in QEMU:
  New

Bug description:
  The following code snippet crashes qemu with

  .../tcg/tcg.c:3279: tcg fatal error
  qemu-x86_64: 
/usr/local/google/home/kostik/qemu-5.0.0-rc4/accel/tcg/cpu-exec.c:701: int 
cpu_exec(CPUState *): Assertion `!have_mmap_lock()' failed.

  ================
  int main() {
    /*
  00000000 <.data>:
     0:   2e 45 71 ff             cs rex.RB jno 0x3
     4:   e9 00 00 f0 00          jmp    0xf00009
     9:   c4 42 7d 31 3e          vpmovzxbd ymm15,QWORD PTR [r14]
     e:   c4 a3 7d 08 64 82 44    vroundps ymm4,YMMWORD PTR [rdx+r8*4+0x44],0x0
    15:   00 
    16:   0f 1e 0a                nop    DWORD PTR [rdx]
    19:   43 0f ec 20             rex.XB paddsb mm4,QWORD PTR [r8]
    1d:   66 47 0f 3a 0c 3d 00    rex.RXB blendps xmm15,XMMWORD PTR 
[rip+0x8000],0x0        # 0x8028
    24:   80 00 00 00 
    28:   c4 e3 f9 df 5f 86 0d    vaeskeygenassist xmm3,XMMWORD PTR 
[rdi-0x7a],0xd
    2f:   c4 e2 55 92 74 fc 0a    vgatherdps ymm6,DWORD PTR 
[rsp+ymm7*8+0xa],ymm5
    36:   c4 e2 f9 17 9a 01 00    vptest xmm3,XMMWORD PTR [rdx+0x1]
    3d:   00 00 
  */
    char buf[] = {
      0x2E, 0x45, 0x71, 0xFF, 0xE9, 0x00, 0x00, 0xF0, 0x00, 0xC4, 0x42, 0x7D, 
0x31, 0x3E, 0xC4, 0xA3, 0x7D, 0x08, 0x64, 0x82, 0x44, 0x00, 0x0F, 0x1E, 0x0A, 
0x43, 0x0F, 0xEC, 0x20, 0x66, 0x47, 0x0F, 0x3A, 0x0C, 0x3D, 0x00, 0x80, 0x00, 
0x00, 0x00, 0xC4, 0xE3, 0xF9, 0xDF, 0x5F, 0x86, 0x0D, 0xC4, 0xE2, 0x55, 0x92, 
0x74, 0xFC, 0x0A, 0xC4, 0xE2, 0xF9, 0x17, 0x9A, 0x01, 0x00, 0x00, 0x00
    };
    void (*f)(void) = (void (*) (void))buf;
    f();
    return 0;
  }
  ================
  Steps to reproduce:
  1) clang -static repro.c -o repro
  2) qemu-x86_64-static repro

  Tested with 4.2.0 and 5.0.0-rc4. Both -user and -system variants are
  affected.

  A few more snippets that cause the same sort of behavior:
  1) 0x64, 0x46, 0x7D, 0xFF, 0xDF, 0x27, 0x46, 0x0F, 0xD4, 0x83, 0x5E, 0x00, 
0x00, 0x00, 0x3E, 0x0F, 0x6A, 0xEF, 0x0F, 0x05, 0xC4, 0x42, 0xFD, 0x1E, 0xCF, 
0x46, 0x18, 0xE3, 0x47, 0xCD, 0x4E, 0x6E, 0x0F, 0x0F, 0x16, 0x8A

  2) 0x67, 0x45, 0xDB, 0xD0, 0xAA, 0xC4, 0xE2, 0xB1, 0x01, 0x57, 0x00,
  0xF3, 0x6F, 0xF3, 0x42, 0x0F, 0x1E, 0xFD, 0x64, 0x2E, 0xF2, 0x45,
  0xD9, 0xC4, 0x3E, 0xF3, 0x0F, 0xAE, 0xF4, 0x3E, 0x47, 0x0F, 0x1C,
  0x22, 0x42, 0x73, 0xFF, 0xD9, 0xFD

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