[llvm-bugs] [Bug 31756] New: XRay crashes when rtdscp access is disabled

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31756

            Bug ID: 31756
           Summary: XRay crashes when rtdscp access is disabled
           Product: XRay
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime
          Assignee: dberris at google.com
          Reporter: simon.dardis at imgtec.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Some Linux configurations inhibit the use of rtdscp, resulting in an illegal
instruction exception at runtime.


Furthermore, the expected files: /sys/devices/system/cpu/cpu0/tsc_freq_khz and
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq are not present.

Machine:
Linux mipstest 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02)
x86_64 GNU/Linux

Test output:

FAIL: XRay-x86_64-linux :: TestCases/Linux/argv0-log-file-name.cc (32456 of
38389)
******************** TEST 'XRay-x86_64-linux ::
TestCases/Linux/argv0-log-file-name.cc' FAILED ********************
Script:
--
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/./bin/clang
--driver-mode=g++ -fxray-instrument -m64  -std=c++11
/home/snd-local/releases/release/rc1/llvm.src/projects/compiler-rt/test/xray/TestCases/Linux/argv0-log-file-name.cc
-o
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/argv0-log-file-name.cc.tmp
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/argv0-log-file-name.cc.tmp
> xray.log.file.name 2>&1
ls | FileCheck xray.log.file.name
rm xray-log.* xray.log.file.name
--
Exit Code: 132

Command Output (stderr):
--
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/argv0-log-file-name.cc.script:
line 4: 31143 Illegal instruction    
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/argv0-log-file-name.cc.tmp
> xray.log.file.name 2>&1

--

********************
Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80
FAIL: XRay-x86_64-linux :: TestCases/Linux/fixedsize-logging.cc (32458 of
38389)
******************** TEST 'XRay-x86_64-linux ::
TestCases/Linux/fixedsize-logging.cc' FAILED ********************
Script:
--
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/./bin/clang
--driver-mode=g++ -fxray-instrument -m64  -std=c++11
/home/snd-local/releases/release/rc1/llvm.src/projects/compiler-rt/test/xray/TestCases/Linux/fixedsize-logging.cc
-o
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/fixedsize-logging.cc.tmp
XRAY_OPTIONS="verbosity=1 xray_logfile_base=fixedsize-logging-" 
/home/snd-local/releases/release/rc1/Phase3/Release/llvmCore-4.0.0-rc1.obj/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/fixedsize-logging.cc.tmp
2>&1 | FileCheck
/home/snd-local/releases/release/rc1/llvm.src/projects/compiler-rt/test/xray/TestCases/Linux/fixedsize-logging.cc
rm fixedsize-logging-*
--
Exit Code: 1

Command Output (stderr):
--
/home/snd-local/releases/release/rc1/llvm.src/projects/compiler-rt/test/xray/TestCases/Linux/fixedsize-logging.cc:19:12:
error: expected string not found in input
 // CHECK: foo() is always instrumented!
           ^
<stdin>:2:1: note: scanning from here
==31182==Unable to determine CPU frequency for TSC accounting.
^
<stdin>:2:44: note: possible intended match here
==31182==Unable to determine CPU frequency for TSC accounting.

Ideally, XRay should probe if possible to determine if rtdsc(p) can be used.

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