The only similar case we ran into was a situation where our kernel was playing tricks and essentially re-loading a module at the same location. So what would happen is:
1 - kernel would load a.out's .text section at 0x10000 2 - LLDB would notice via a module loaded notification and would set a breakpoint at 0x10000 + offset 3 - kernel would load a.out's .text section at 0x10000 but erase all changes, like the breakpoint we set above in step 2 4 - We would get a load notification for a.out's .text section again, but we would see that the location didn't change, so the module doesn't send out a module loaded notification and we would lose the breakpoint for good What our dynamic loader had to do was to know that this can happen and if you get a load notification for a section, send a module unloaded for a.out first (which would clear the breakpoint), and then send out a module loaded notification and the breakpoint would get set correctly once again when the section was reloaded. Greg Clayton > On Mar 18, 2016, at 11:59 AM, Dean De Leo via lldb-dev > <lldb-dev@lists.llvm.org> wrote: > > Hi, > > we have been observing that, sporadically, an internal callback set for a > breakpoint is not invoked. We are setting an hidden breakpoint in the > renderscript plugin through: > > breakpoint = target.CreateBreakpoint(symbol_address, true, false); > breakpoint->SetCallback(rs_callback, rs_baton, true); > > where symbol_address refers to a runtime function x in the debugged process. > The callback is properly invoked 99% of the time that the process calls the > function x, though occasionally it is missed, while both prior and further > calls are recorded. > > This issue seems to occur only in android/mips32, though we are not able to > exclude whether other platforms are affected. > > Has anyone experienced a similar issue or can provide any suggestion to what > might be worth to watch for that might cause this behaviour? > > Thanks, > Dean > > -- > Codeplay Software Ltd > Level C, Argyle House > 3 Lady Lawson Street, Edinburgh, EH3 9DR > Tel: 0131 466 0503 > Fax: 0131 557 6600 > Website: http://www.codeplay.com > Twitter: https://twitter.com/codeplaysoft > > _______________________________________________ > lldb-dev mailing list > lldb-dev@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
