Public bug reported:
I'm trying to execute code that has been built with -march=skylake
-mtune=generic -mavx2 under qemu-user x86-64 with -cpu Skylake-Client.
However this code just hangs at 100% CPU.
Adding input tracing shows that it is likely hanging when dealing with
an AVX instruction:
warning: TCG doesn't support requested feature: CPUID.01H:ECX.fma [bit 12]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit
24]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.f16c [bit 29]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.rdrand [bit 30]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.hle [bit 4]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.avx2 [bit 5]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rdseed [bit 18]
warning: TCG doesn't support requested feature:
CPUID.80000001H:ECX.3dnowprefetch [bit 8]
warning: TCG doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
IN:
0x4000b4ef3b: c5 fb 5c ca vsubsd %xmm2, %xmm0, %xmm1
0x4000b4ef3f: c4 e1 fb 2c d1 vcvttsd2si %xmm1, %rdx
0x4000b4ef44: 4c 31 e2 xorq %r12, %rdx
0x4000b4ef47: 48 85 d2 testq %rdx, %rdx
0x4000b4ef4a: 79 9e jns 0x4000b4eeea
[ hangs ]
Attaching a gdb produces this stacktrace:
(gdb) bt
#0 canonicalize (status=0x55a20ff67a88, parm=0x55a20bb807e0 <float64_params>,
part=...)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:350
#1 float64_unpack_canonical (s=0x55a20ff67a88, f=0)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:547
#2 float64_sub (a=0, b=4890909195324358656, status=0x55a20ff67a88)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:776
#3 0x000055a20baa1949 in helper_subsd (env=<optimized out>, d=0x55a20ff67ad8,
s=<optimized out>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/target/i386/ops_sse.h:623
#4 0x000055a20cfcfea8 in static_code_gen_buffer ()
#5 0x000055a20ba3f764 in cpu_tb_exec (itb=<optimized out>, cpu=0x55a20cea2180
<static_code_gen_buffer+15684720>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:171
#6 cpu_loop_exec_tb (tb_exit=<synthetic pointer>, last_tb=<synthetic pointer>,
tb=<optimized out>,
cpu=0x55a20cea2180 <static_code_gen_buffer+15684720>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:615
#7 cpu_exec (cpu=cpu@entry=0x55a20ff5f4d0)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:725
#8 0x000055a20ba6d728 in cpu_loop (env=0x55a20ff67780)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/linux-user/x86_64/../i386/cpu_loop.c:93
#9 0x000055a20ba049ff in main (argc=<optimized out>, argv=0x7ffc58572868,
envp=<optimized out>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/linux-user/main.c:819
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1818075
Title:
qemu-user-x86-64 hangs at vcvttsd2si
Status in QEMU:
New
Bug description:
I'm trying to execute code that has been built with -march=skylake
-mtune=generic -mavx2 under qemu-user x86-64 with -cpu Skylake-Client.
However this code just hangs at 100% CPU.
Adding input tracing shows that it is likely hanging when dealing with
an AVX instruction:
warning: TCG doesn't support requested feature: CPUID.01H:ECX.fma [bit 12]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline
[bit 24]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.f16c [bit 29]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.rdrand [bit 30]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.hle [bit 4]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.avx2 [bit 5]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rdseed [bit 18]
warning: TCG doesn't support requested feature:
CPUID.80000001H:ECX.3dnowprefetch [bit 8]
warning: TCG doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
IN:
0x4000b4ef3b: c5 fb 5c ca vsubsd %xmm2, %xmm0, %xmm1
0x4000b4ef3f: c4 e1 fb 2c d1 vcvttsd2si %xmm1, %rdx
0x4000b4ef44: 4c 31 e2 xorq %r12, %rdx
0x4000b4ef47: 48 85 d2 testq %rdx, %rdx
0x4000b4ef4a: 79 9e jns 0x4000b4eeea
[ hangs ]
Attaching a gdb produces this stacktrace:
(gdb) bt
#0 canonicalize (status=0x55a20ff67a88, parm=0x55a20bb807e0
<float64_params>, part=...)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:350
#1 float64_unpack_canonical (s=0x55a20ff67a88, f=0)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:547
#2 float64_sub (a=0, b=4890909195324358656, status=0x55a20ff67a88)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/fpu/softfloat.c:776
#3 0x000055a20baa1949 in helper_subsd (env=<optimized out>,
d=0x55a20ff67ad8, s=<optimized out>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/target/i386/ops_sse.h:623
#4 0x000055a20cfcfea8 in static_code_gen_buffer ()
#5 0x000055a20ba3f764 in cpu_tb_exec (itb=<optimized out>,
cpu=0x55a20cea2180 <static_code_gen_buffer+15684720>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:171
#6 cpu_loop_exec_tb (tb_exit=<synthetic pointer>, last_tb=<synthetic
pointer>, tb=<optimized out>,
cpu=0x55a20cea2180 <static_code_gen_buffer+15684720>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:615
#7 cpu_exec (cpu=cpu@entry=0x55a20ff5f4d0)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/accel/tcg/cpu-exec.c:725
#8 0x000055a20ba6d728 in cpu_loop (env=0x55a20ff67780)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/linux-user/x86_64/../i386/cpu_loop.c:93
#9 0x000055a20ba049ff in main (argc=<optimized out>, argv=0x7ffc58572868,
envp=<optimized out>)
at
/data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-3.1.0/linux-user/main.c:819
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