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[Bug 1874888] Re: certain programs make QEMU crash with "tcg fatal error
From: |
Launchpad Bug Tracker |
Subject: |
[Bug 1874888] Re: certain programs make QEMU crash with "tcg fatal error" |
Date: |
Sat, 10 Jul 2021 04:17:27 -0000 |
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1874888
Title:
certain programs make QEMU crash with "tcg fatal error"
Status in QEMU:
Expired
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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