certain programs make QEMU crash with "tcg fatal error"

[Konstantin]

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

[Thomas Huth (th-huth)]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]

[Philippe Mathieu-Daudé (philmd)]

Running with '-d in_asm' under gdb I get:

----------------
IN:
0x40007feef0: 2e 45 71 ff jno 0x40007feef3

----------------
IN:
0x40007feef3: ff .byte 0xff
0x40007feef4: e9 .byte 0xe9

Thread 1 "qemu-x86_64" received signal SIGILL, Illegal instruction.

Thomas, could you migrate this to bug gitlab issues please?

[Thomas Huth (th-huth)]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/683