[lldb-dev] [Bug 15258] New: lldb asserts on Linux in ProcessMonitor::GetCrashReasonForSIGSEGV

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15258

            Bug ID: 15258
           Summary: lldb asserts on Linux in
                    ProcessMonitor::GetCrashReasonForSIGSEGV
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: daniel.malea at intel.com
    Classification: Unclassified

In the testcase TestExprDoesntBlock.py, the inferior sometimes (but not always)
receives a SIGSEGV during expression evaluation. The siginfo structure that
LLDB gets from the kernel has an invalid si_code value (128 == SI_KERNEL).

According to siginfo docs, si_code == SI_KERNEL means that the signal was sent
by the kernel -- but not because a protected or otherwise invalid address was
accessed. Most likely this is happening because of some ptrace() mis-use
somewhere.

While it would be trivial to handle SI_KERNEL and add an appropriate
exit-description string to ProcessMessage.[h|cpp] we want to find out why
SI_KERNEL is being sent to this test case, and why it is not happening always.

Skipping the test case until someone else has time to look at it further.

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