[lldb-dev] 32-bit linux IsWatchpointHit assertion failure due to WriteRegister

[Matthew Gardiner]

Initial investigations suggest that the offset of dr6 is being calculated incorrectly. The trace says 0x2A8, it should be 0x114.

(lldb) log enable linux ptrace
(lldb) run
operation ptrace(PTRACE_SETOPTIONS, 3665, (nil), 0x58, 0)=0 called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 1456
Process 3665 launching
operation ptrace(PTRACE_TRACEME, 0, (nil), (nil), 0)=0 called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 1196
operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EED31 called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EED31 called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
operation ptrace(PTRACE_POKEDATA, 3665, 0x8048340, 0x895eedcc, 0)=0 called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 319
operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EEDCC called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
MATTG IWH begin
WriteRegisterValue dr6 tid=3665 offset=2A8 val=FFFFFFFF
operation ptrace(PTRACE_POKEUSER, 3665, 0x2a8, 0xffffffff, 0)=FFFFFFFF called from file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 543


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