I think you want this change:
https://gem5-review.googlesource.com/c/public/gem5/+/49183
On Fri, Dec 3, 2021 at 4:26 PM Nirmit Jallawar <jalla...@wisc.edu> wrote:
> Hi Gabe,
>
>
>
> Here is the backtrace using gdb:
>
>
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 4 :
> CALL_NEAR_I : wrip t7, t1 : IntAlu :
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096 : hint
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096. 0 :
> HINT_NOP : fault NoFault : No_OpClass :
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100 : mov
> eax, 0xc
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100. 0 :
> MOV_R_I : limm eax, 0xc : IntAlu : D=0x000000000000000c
>
> build/X86/arch/x86/insts/static_inst.cc:254: panic: Unknown register
> class: 1500478240
>
> Memory Usage: 643980 KBytes
>
>
>
> Program received signal SIGABRT, Aborted.
>
> __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
>
> 50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
>
>
>
> (gdb) bt
>
> #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
>
> #1 0x00007ffff6bcb859 in __GI_abort () at abort.c:79
>
> #2 0x00005555557269b8 in gem5::Logger::exit_helper (this=0x555559b34a20)
> at build/X86/base/logging.hh:124
>
> #3 0x000055555574b537 in gem5::X86ISA::X86StaticInst::printReg (os=...,
> reg=..., size=4) at build/X86/arch/x86/insts/static_inst.cc:254
>
> #4 0x000055555584a934 in
> gem5::X86ISAInst::SyscallInst::generateDisassembly[abi:cxx11](unsigned
> long, gem5::loader::SymbolTable const*) const (this=0x5555596f6e70,
> PC=140737354256521, symtab=0x555557fb2ea0 <gem5::loader::debugSymbolTable>)
> at build/X86/arch/x86/generated/decoder-ns.cc.inc:81
>
> #5 0x0000555555e0d881 in
> gem5::StaticInst::disassemble[abi:cxx11](unsigned long,
> gem5::loader::SymbolTable const*) const (this=0x5555596f6e70,
> pc=140737354256521, symtab=0x555557fb2ea0 <gem5::loader::debugSymbolTable>)
> at build/X86/cpu/static_inst.cc:79
>
> #6 0x0000555555e054cd in gem5::Trace::ExeTracerRecord::traceInst
> (this=0x555559a39b90, inst=..., ran=true) at build/X86/cpu/exetrace.cc:105
>
> #7 0x0000555555e05c22 in gem5::Trace::ExeTracerRecord::dump
> (this=0x555559a39b90) at build/X86/cpu/exetrace.cc:177
>
> #8 0x0000555555ec4b91 in gem5::o3::Commit::commitHead
> (this=0x55555949b880, head_inst=..., inst_num=0) at
> build/X86/cpu/o3/commit.cc:1273
>
> #9 0x0000555555ec2e43 in gem5::o3::Commit::commitInsts
> (this=0x55555949b880) at build/X86/cpu/o3/commit.cc:1020
>
> #10 0x0000555555ec249d in gem5::o3::Commit::commit (this=0x55555949b880)
> at build/X86/cpu/o3/commit.cc:906
>
> #11 0x0000555555ec0a3b in gem5::o3::Commit::tick (this=0x55555949b880) at
> build/X86/cpu/o3/commit.cc:663
>
> #12 0x0000555555ed4254 in gem5::o3::CPU::tick (this=0x555559498000) at
> build/X86/cpu/o3/cpu.cc:522
>
> #13 0x0000555555ed0995 in gem5::o3::CPU::<lambda()>::operator()(void)
> const (__closure=0x555559498370) at build/X86/cpu/o3/cpu.cc:76
>
> #14 0x0000555555edb884 in std::_Function_handler<void(),
> gem5::o3::CPU::CPU(const gem5::O3CPUParams&)::<lambda()> >::_M_invoke(const
> std::_Any_data &) (__functor=...) at
> /usr/include/c++/9/bits/std_function.h:300
>
> #15 0x00005555557570ae in std::function<void ()>::operator()() const
> (this=0x555559498370) at /usr/include/c++/9/bits/std_function.h:688
>
> #16 0x00005555557543d0 in gem5::EventFunctionWrapper::process
> (this=0x555559498338) at build/X86/sim/eventq.hh:1141
>
> #17 0x0000555556531f5c in gem5::EventQueue::serviceOne
> (this=0x5555587fbd40) at build/X86/sim/eventq.cc:223
>
> #18 0x0000555556559cc3 in gem5::doSimLoop (eventq=0x5555587fbd40) at
> build/X86/sim/simulate.cc:219
>
> #19 0x00005555565598c3 in gem5::simulate (num_cycles=18446744073709551615)
> at build/X86/sim/simulate.cc:132
>
> #20 0x00005555564feb48 in pybind11::detail::argument_loader<unsigned
> long>::call_impl<gem5::GlobalSimLoopExitEvent*,
> gem5::GlobalSimLoopExitEvent* (*&)(unsigned long), 0ul,
> pybind11::detail::void_type>(gem5::GlobalSimLoopExitEvent* (*&)(unsigned
> long), std::integer_sequence<unsigned long, 0ul>,
> pybind11::detail::void_type&&) && (this=0x7fffffffd028, f=@0x555558dd00c8:
> 0x555556559589 <gem5::simulate(unsigned long)>) at
> ext/pybind11/include/pybind11/cast.h:2042
>
> #21 0x00005555564fce1e in pybind11::detail::argument_loader<unsigned
> long>::call<gem5::GlobalSimLoopExitEvent*, pybind11::detail::void_type,
> gem5::GlobalSimLoopExitEvent* (*&)(unsigned
> long)>(gem5::GlobalSimLoopExitEvent* (*&)(unsigned long)) &&
> (this=0x7fffffffd028, f=@0x555558dd00c8: 0x555556559589
> <gem5::simulate(unsigned long)>) at
> ext/pybind11/include/pybind11/cast.h:2014
>
> #22 0x00005555564f9183 in
> pybind11::cpp_function::initialize<gem5::GlobalSimLoopExitEvent*
> (*&)(unsigned long), gem5::GlobalSimLoopExitEvent*, unsigned long,
> pybind11::name, pybind11::scope, pybind11::sibling,
> pybind11::arg_v>(gem5::GlobalSimLoopExitEvent* (*&)(unsigned long),
> gem5::GlobalSimLoopExitEvent* (*)(unsigned long), pybind11::name const&,
> pybind11::scope const&, pybind11::sibling const&, pybind11::arg_v
> const&)::{lambda(pybind11::detail::function_call&)#3}::operator()(pybind11::detail::function_call&)
> const (this=0x0, call=...) at ext/pybind11/include/pybind11/pybind11.h:192
>
> #23 0x00005555564f91ee in
> pybind11::cpp_function::initialize<gem5::GlobalSimLoopExitEvent*
> (*&)(unsigned long), gem5::GlobalSimLoopExitEvent*, unsigned long,
> pybind11::name, pybind11::scope, pybind11::sibling,
> pybind11::arg_v>(gem5::GlobalSimLoopExitEvent* (*&)(unsigned long),
> gem5::GlobalSimLoopExitEvent* (*)(unsigned long), pybind11::name const&,
> pybind11::scope const&, pybind11::sibling const&, pybind11::arg_v
> const&)::{lambda(pybind11::detail::function_call&)#3}::_FUN(pybind11::detail::function_call&)
> () at ext/pybind11/include/pybind11/pybind11.h:170
>
> #24 0x0000555556041bb5 in pybind11::cpp_function::dispatcher
> (self=0x7ffff5be9e10, args_in=0x7ffff5fe7040, kwargs_in=0x7ffff526d5c0) at
> ext/pybind11/include/pybind11/pybind11.h:767
>
> #25 0x00007ffff7cfb718 in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #26 0x00007ffff7ad0f48 in _PyEval_EvalFrameDefault () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #27 0x00007ffff7c1decb in _PyEval_EvalCodeWithName () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #28 0x00007ffff7cfb0f4 in _PyFunction_Vectorcall () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #29 0x00007ffff7ac7d6d in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #30 0x00007ffff7acfef6 in _PyEval_EvalFrameDefault () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #31 0x00007ffff7c1decb in _PyEval_EvalCodeWithName () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #32 0x00007ffff7c1e252 in PyEval_EvalCodeEx () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #33 0x00007ffff7c1e63f in PyEval_EvalCode () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #34 0x00007ffff7c22c81 in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #35 0x00007ffff7cb2527 in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #36 0x00007ffff7ac7d6d in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #37 0x00007ffff7ac946d in _PyEval_EvalFrameDefault () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #38 0x00007ffff7c1decb in _PyEval_EvalCodeWithName () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #39 0x00007ffff7cfb0f4 in _PyFunction_Vectorcall () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #40 0x00007ffff7ac7d6d in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #41 0x00007ffff7acfef6 in _PyEval_EvalFrameDefault () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #42 0x00007ffff7c1decb in _PyEval_EvalCodeWithName () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #43 0x00007ffff7c1e252 in PyEval_EvalCodeEx () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #44 0x00007ffff7c1e63f in PyEval_EvalCode () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #45 0x00007ffff7bdf0dc in ?? () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #46 0x00007ffff7bdf429 in PyRun_StringFlags () from
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0
>
> #47 0x000055555653ff65 in gem5::m5Main (argc=6, _argv=0x7fffffffe1c8) at
> build/X86/sim/init.cc:302
>
> #48 0x0000555555724753 in main (argc=6, argv=0x7fffffffe1c8) at
> build/X86/sim/main.cc:69
>
> (gdb)
>
>
>
> Let me know if I can add any more information.
>
>
>
> Nirmit
>
> *From:* gabe.bl...@gmail.com <gabe.bl...@gmail.com>
> *Sent:* Thursday, December 2, 2021 8:38 PM
> *To:* Nirmit Jallawar <jalla...@wisc.edu>
> *Cc:* mattdsinclair.w...@gmail.com; gem5 users mailing list <
> gem5-users@gem5.org>
> *Subject:* Re: [gem5-users] Unrecognized register class when using the
> "Exec" debug flag
>
>
>
> Hey Nirmit, thanks for the backtrace, but could you please run this under
> gdb and get the backtrace that way? It will figure out what the function
> names are, etc, where gem5's built in backtrace just has offsets.
>
>
>
> Gabe
>
>
>
> On Thu, Dec 2, 2021 at 3:37 PM Nirmit Jallawar <jalla...@wisc.edu> wrote:
>
> Hi Matt, Gabe,
>
>
>
> Running in the develop branch the code, seems to run without any errors. I
> suppose this is due to the fact that things have been reworked in develop.
>
>
>
> The backtrace generated by the debug build on the stable branch is:
>
>
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 3 :
> CALL_NEAR_I : subi rsp, rsp, 0x8 : IntAlu : D=0x00007fffffffed48
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 4 :
> CALL_NEAR_I : wrip t7, t1 : IntAlu :
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096 : hint
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096. 0 :
> HINT_NOP : fault NoFault : No_OpClass :
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100 : mov
> eax, 0xc
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100. 0 :
> MOV_R_I : limm eax, 0xc : IntAlu : D=0x000000000000000c
>
> build/X86/arch/x86/insts/static_inst.cc:254: panic: Unknown register
> class: 1066703648
>
> Memory Usage: 643980 KBytes
>
> Program aborted at tick 7455000
>
> --- BEGIN LIBC BACKTRACE ---
>
> ../build/X86/gem5.debug(+0xfcebed)[0x55f53b785bed]
>
> ../build/X86/gem5.debug(+0xff1b11)[0x55f53b7a8b11]
>
> /lib/x86_64-linux-gnu/libpthread.so.0(+0x15420)[0x7fdcfff9f420]
>
> /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcb)[0x7fdcff14618b]
>
> /lib/x86_64-linux-gnu/libc.so.6(abort+0x12b)[0x7fdcff125859]
>
> ../build/X86/gem5.debug(+0x1d29b8)[0x55f53a9899b8]
>
> ../build/X86/gem5.debug(+0x1f7537)[0x55f53a9ae537]
>
> ../build/X86/gem5.debug(+0x2f6934)[0x55f53aaad934]
>
> ../build/X86/gem5.debug(+0x8b9881)[0x55f53b070881]
>
> ../build/X86/gem5.debug(+0x8b14cd)[0x55f53b0684cd]
>
> ../build/X86/gem5.debug(+0x8b1c22)[0x55f53b068c22]
>
> ../build/X86/gem5.debug(+0x970b91)[0x55f53b127b91]
>
> ../build/X86/gem5.debug(+0x96ee43)[0x55f53b125e43]
>
> ../build/X86/gem5.debug(+0x96e49d)[0x55f53b12549d]
>
> ../build/X86/gem5.debug(+0x96ca3b)[0x55f53b123a3b]
>
> ../build/X86/gem5.debug(+0x980254)[0x55f53b137254]
>
> ../build/X86/gem5.debug(+0x97c995)[0x55f53b133995]
>
> ../build/X86/gem5.debug(+0x987884)[0x55f53b13e884]
>
> ../build/X86/gem5.debug(+0x2030ae)[0x55f53a9ba0ae]
>
> ../build/X86/gem5.debug(+0x2003d0)[0x55f53a9b73d0]
>
> ../build/X86/gem5.debug(+0xfddf5c)[0x55f53b794f5c]
>
> ../build/X86/gem5.debug(+0x1005cc3)[0x55f53b7bccc3]
>
> ../build/X86/gem5.debug(+0x10058c3)[0x55f53b7bc8c3]
>
> ../build/X86/gem5.debug(+0xfaab48)[0x55f53b761b48]
>
> ../build/X86/gem5.debug(+0xfa8e1e)[0x55f53b75fe1e]
>
> ../build/X86/gem5.debug(+0xfa5183)[0x55f53b75c183]
>
> ../build/X86/gem5.debug(+0xfa51ee)[0x55f53b75c1ee]
>
> ../build/X86/gem5.debug(+0xaedbb5)[0x55f53b2a4bb5]
>
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0(+0x2a8718)[0x7fdd00255718]
>
>
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x8dd8)[0x7fdd0002af48]
>
>
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0x8fb)[0x7fdd00177ecb]
>
>
> /lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyFunction_Vectorcall+0x94)[0x7fdd002550f4]
>
> --- END LIBC BACKTRACE ---
>
>
>
> I am leaning towards Gabe’s idea that the real bug is that the RegID
> itself is bogus since different ones are being generated each run.
>
>
>
> I am sorry for the late response.
>
>
>
> Nirmit
>
>
>
> *From:* mattdsinclair.w...@gmail.com <mattdsinclair.w...@gmail.com>
> *Sent:* Wednesday, December 1, 2021 11:07 PM
> *To:* Gabe Black <gabe.bl...@gmail.com>
> *Cc:* gem5 users mailing list <gem5-users@gem5.org>; Nirmit Jallawar <
> jalla...@wisc.edu>
> *Subject:* Re: [gem5-users] Unrecognized register class when using the
> "Exec" debug flag
>
>
>
> Thanks Gabe. Good catch about the actual value -- I just saw a negative
> number and assumed -1, whoops. Based on what Nirmit is seeing, it seems
> like HINT_NOP or MOV_R_I must be the instruction causing the fault, but
> yeah a backtrace will probably help confirm.
>
>
>
> Nirmit, can you please try running stable with a debug build (to get a
> backtrace) and develop with a release build and let us know what you see?
>
>
>
> Matt
>
>
>
> On Wed, Dec 1, 2021 at 10:47 PM Gabe Black <gabe.bl...@gmail.com> wrote:
>
> I realize this is probably a hard question to answer with Exec being
> broken, but do you know what instruction is causing the problem? HINT_NOP?
> Probably the first thing that someone should do (if they haven't already)
> is to run this under gdb and see what the backtrace looks like, since that
> would give us a lot more info to work with.
>
>
>
> Looking at the info we have here, I see that the return from classValue()
> is -854770912 (not -1?) which to me looks like junk. I think probably
> what's happening is that the RegId being passed to the instruction's
> printReg function is from a bad pointer of some sort which is why it
> doesn't know how to print the register name. The RegId in this case refers
> to a particular register/operand, not the instruction as a whole. For
> instance, when the previous instruction prints out eax, that would be a
> RegId with classValue() (member regClass) set to IntRegClass, and regIdx
> set to INTREG_RAX.
>
>
>
> This works a little differently now and is in the process of being
> significantly reworked, although the gist is largely the same, particularly
> in the details involved here. The RegId structure tells you what type of
> register you're dealing with, aka its class, and also which particular
> register within that space you're referring to. The printReg method is
> trying to figure out what the name of that register is so it can be printed
> as part of the disassembly.
>
>
>
> I think the real bug is going to be that the RegId itself is bogus, and so
> when it's operated on, it's random junk will lead to random behavior or
> errors. It could be, for instance, that the instruction is trying to print
> a register name in its disassembly, but it doesn't actually *have* a
> register value set up in that slot and so is using uninitialized values.
> Typically the instructions would try to print out, say, destination
> register 0 when forming the disassembly string. Alternatively, O3 could
> have done something whacky and could be trying to do something with a
> nonsense instruction. I would personally lean towards the first option, but
> without more info it's hard to tell.
>
>
>
> I would also suggest trying this with develop. I don't think that's a
> *solution* to the problem, but it would possibly help isolate a cause. Like
> I said, how things work in develop are a little bit different, so we might
> get more info by also seeing what happens in those slightly different
> circumstances.
>
>
>
> Gabe
>
>
>
> On Wed, Dec 1, 2021 at 8:30 PM Matt Sinclair <mattdsinclair.w...@gmail.com>
> wrote:
>
> Hi Gabe,
>
>
>
> I was trying to dig through the RegClass code earlier to figure out why
> the value is -1 for this instruction, and the only thing that I can think
> of is HINT_NOP needs a RegClass value set for it, but it isn't set for some
> reason (which is not 100% clear to me). You know this code much better
> than I do though, hence I was hoping you might see something I'm not seeing.
>
>
>
> Since this error is happening on a clean checkout of gem5 on stable, it
> seems like a bug that anyone could face if they use the Exec debug flag.
>
>
>
> Thanks,
>
> Matt
>
>
>
> ---------- Forwarded message ---------
> From: *Nirmit Jallawar via gem5-users* <gem5-users@gem5.org>
> Date: Wed, Dec 1, 2021 at 10:25 PM
> Subject: [gem5-users] Unrecognized register class when using the "Exec"
> debug flag
> To: gem5-users@gem5.org <gem5-users@gem5.org>
> Cc: Nirmit Jallawar <jalla...@wisc.edu>
>
>
>
> Hi all,
>
>
>
> I was trying to run a gem5 simulation using the O3CPU but encountered
> problems with gem5 “panic” when running with the “Exec” debug flags
> enabled. I have built gem5 for the x86 ISA, and am using the stable branch.
>
> The full log can be found in the zip linked below (crash_debug_log).
>
> The error in the log seems to be related to this:
>
> build/X86/arch/x86/insts/static_inst.cc:253: panic: Unrecognized register
> class.
>
>
>
> On further debugging, it seems that the register class value is being set
> to -1:
>
> ….
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 2 :
> CALL_NEAR_I : stis t7, SS:[rsp + 0xfffffffffffffff8] : MemWrite :
> D=0x00007ffff801bbe2 A=0x7fffffffed48
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 3 :
> CALL_NEAR_I : subi rsp, rsp, 0x8 : IntAlu : D=0x00007fffffffed48
>
> 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 4 :
> CALL_NEAR_I : wrip t7, t1 : IntAlu :
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096 : hint
>
> 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096. 0 :
> HINT_NOP : fault NoFault : No_OpClass :
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100 : mov
> eax, 0xc
>
> 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100. 0 :
> MOV_R_I : limm eax, 0xc : IntAlu : D=0x000000000000000c
>
> build/X86/arch/x86/insts/static_inst.cc:254: panic: Unknown register
> class: -854770912 (reg.classValue())
>
> Memory Usage: 632228 KBytes
>
> Program aborted at tick 7455000
>
> --- BEGIN LIBC BACKTRACE ---
>
> ….
>
> The error does not appear when using no debug flags or using flags like
> 'IEW'.
>
> The command used to run the simulation is:
>
> ../build/X86/gem5.opt --debug-flags=Exec DAXPY-newCPU.py daxpy --cpu O3CPU
>
> If needed, you can find the related files here:
> https://drive.google.com/file/d/1Sxg-c9Gy0NU2r3_nd88A_le18C5RkuR_/view?usp=sharing
>
> I would appreciate any help on this.
>
>
>
> Best,
>
> Nirmit
>
>
>
>
>
>
>
> _______________________________________________
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