Hi Arun, Two quick ideas...
1. The address 0x56318e53ed40 looks suspect. That's not on the stack, in the OS, on the heap... I think it's probably a bad address. Most likely some other instruction before this one is causing a bad address to be emitted. 2. CLWB/CLFLUSH/CLFLUSHOPT may or may not be implemented in the core model and in the memory system you're using. I'd take a look at the Exec trace to see exactly what microops are executing and then also trace the cache/memory system to make sure the effects are what you expect. Cheers, Jason On Mon, May 3, 2021 at 8:16 AM Arun Kavumkal via gem5-users < gem5-users@gem5.org> wrote: > Hi, > > I am running a linked list with each node having *512Bytes* allocated > using malloc. I am then flushing cache line aligned addresses (using > *clwb*) from this 512Bytes to measure the flush overhead. The benchmark > works fine in Linux X86 system. But while running in gem5, I am getting the > following error. Can someone please point me to possible issue. The gem5 I > am using is an earlier version. > > Gem5 command : > > *gem5/build/X86/gem5.opt gem5/configs/example/se.py --cmd=$command > --options="$options" --l1d-hwp-type=StridePrefetcher > --l2-hwp-type=BOPPrefetcher --cpu-type=DerivO3CPU --mem-type=DDR4_2400_16x4 > --caches --l2cache --mem-size=10GB* > > $command and $options takes benchmark values > > The benchmark works fine with other flush variants, ie *clflush* and > *clflushopt* > > Thanks a lot, I am trying to figure out the issue from couple of days, but > could not yet > > panic: Tried to write unmapped address 0x56318e53ed40. > PC: 0x20ee, Instr: CLWB_M : clwb %ctrl155, DS:[rcx] > Memory Usage: 10697132 KBytes > Program aborted at tick 225239086116 > --- BEGIN LIBC BACKTRACE --- > gem5/build/X86/gem5.opt(_Z15print_backtracev+0x2c)[0x563187fada8c] > gem5/build/X86/gem5.opt(_Z12abortHandleri+0x4a)[0x563187fbfb2a] > /lib/x86_64-linux-gnu/libpthread.so.0(+0x128a0)[0x7f8ba9c998a0] > /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f8ba8275f47] > /lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f8ba82778b1] > gem5/build/X86/gem5.opt(+0x51809f)[0x5631875da09f] > gem5/build/X86/gem5.opt(_ZN6X86ISA9PageFault6invokeEP13ThreadContextRK14RefCountingPtrI10StaticInstE+0x57d)[0x56318780562d] > gem5/build/X86/gem5.opt(_ZN13DefaultCommitI9O3CPUImplE10commitHeadERK14RefCountingPtrI13BaseO3DynInstIS0_EEj+0x8ec)[0x563187daafac] > gem5/build/X86/gem5.opt(_ZN13DefaultCommitI9O3CPUImplE11commitInstsEv+0x529)[0x563187dabac9] > gem5/build/X86/gem5.opt(_ZN13DefaultCommitI9O3CPUImplE6commitEv+0xaf0)[0x563187dad180] > gem5/build/X86/gem5.opt(_ZN13DefaultCommitI9O3CPUImplE4tickEv+0xd8)[0x563187dade48] > gem5/build/X86/gem5.opt(_ZN9FullO3CPUI9O3CPUImplE4tickEv+0x150)[0x563187dbdef0] > gem5/build/X86/gem5.opt(_ZN10EventQueue10serviceOneEv+0xd9)[0x563187fb5c59] > gem5/build/X86/gem5.opt(_Z9doSimLoopP10EventQueue+0x87)[0x563187fd6097] > gem5/build/X86/gem5.opt(_Z8simulatem+0xcba)[0x563187fd70ea] > gem5/build/X86/gem5.opt(+0xdb6e71)[0x563187e78e71] > gem5/build/X86/gem5.opt(+0x6226ce)[0x5631876e46ce] > > > > https://stackoverflow.com/questions/67371156/when-using-clwb-panic-tried-to-write-unmapped-address-in-gem5-x86 > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
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