Hi Kleovoulos, Sorry for late reply.
I tried enabling debug flag (--debug-flags=Exec, LocalApic, Faults), and I found that there are also page faults problem. I looked into the kernel codes(from DPRINTF) where it goes into infinite loop, and I realized that it proceeded to __do_page_fault() -> .. -> __bad_area_nosemaphore() -> and kept hanging at "no_context()". I also saw your mailing thread https://www.mail-archive.com/gem5-users@gem5.org/msg16145.html and I think my problem are similar to you problem. However, I didn't understand how this problem is related to the stack, according to reply of your mailing thread. Because I made a checkpoint right after I booted. I mean I didn't execute any benchmark or process. I added my DPRINTF output below, and I hope to we can solve this problem. This output appears repeatedly. 21789 2957438088261250: Page-Fault: RIP 0xffffffff81069890: vector 14: #PF(0x3) at 0xfffffe0000001fb0 21790 2957438088257000: system.switch_cpus T0 : @no_context+48.32930 : Microcode_ROM : ldst t0, HS:[t6] : MemRead : A=0xfffffe0000001fb0 21791 2957438088265250: system.switch_cpus T0 : @no_context+48.32890 : Microcode_ROM : slli t4, t1, 0x4 : IntAlu : D=0x00000000000000e0 21792 2957438088265500: system.switch_cpus T0 : @no_context+48.32891 : Microcode_ROM : ld t2, IDTR:[t4 + 0x8] : MemRead : D=0x00000000ffffffff A=0xfffffe00000000e8 21793 2957438088265750: system.switch_cpus T0 : @no_context+48.32892 : Microcode_ROM : ld t4, IDTR:[t4] : MemRead : D=0x81a08e00001015b0 A=0xfffffe00000000e0 21794 2957438088266000: system.switch_cpus T0 : @no_context+48.32893 : Microcode_ROM : chks , t4b, 0x3 : IntAlu : 21795 2957438088266250: system.switch_cpus T0 : @no_context+48.32894 : Microcode_ROM : srli t10, t4, 0x10 : IntAlu : D=0x000081a08e000010 21796 2957438088266500: system.switch_cpus T0 : @no_context+48.32895 : Microcode_ROM : andi t5, t10, 0xf8 : IntAlu : D=0x0000000000000010 21797 2957438088266750: system.switch_cpus T0 : @no_context+48.32896 : Microcode_ROM : andi t0w, t10w, 0x4 : IntAlu : D=0x0000000000000020 21798 2957438088267000: system.switch_cpus T0 : @no_context+48.32897 : Microcode_ROM : br 0x8084 : No_OpClass : 21799 2957438088267250: system.switch_cpus T0 : @no_context+48.32900 : Microcode_ROM : ld t3, TSG:[t5] : MemRead : D=0x00af9b000000ffff A=0xfffffe0000001010 21800 2957438088267500: system.switch_cpus T0 : @no_context+48.32901 : Microcode_ROM : chks , t3, 0x7 : IntAlu : 21801 2957438088267750: system.switch_cpus T0 : @no_context+48.32902 : Microcode_ROM : wrdl %ctrl145, t3, t10 : IntAlu : D=0x000000000000abd0 21802 2957438088268000: system.switch_cpus T0 : @no_context+48.32903 : Microcode_ROM : wrdh t9, t4, t2 : IntAlu : D=0xffffffff81a015b0 21803 2957438088268250: system.switch_cpus T0 : @no_context+48.32904 : Microcode_ROM : rdsel t11b, t11b, %ctrl128 : IntAlu : D=0x0000000000000000 21804 2957438088268500: system.switch_cpus T0 : @no_context+48.32905 : Microcode_ROM : rdattr t10, %ctrl184, : IntAlu : D=0x000000000000abd0 21805 2957438088268750: system.switch_cpus T0 : @no_context+48.32906 : Microcode_ROM : andi t10, t10, 0x3 : IntAlu : D=0x0000000000000000 21806 2957438088269000: system.switch_cpus T0 : @no_context+48.32907 : Microcode_ROM : rdattr t5, %ctrl179, : IntAlu : D=0x000000000000abd0 21807 2957438088269250: system.switch_cpus T0 : @no_context+48.32908 : Microcode_ROM : andi t5, t5, 0x3 : IntAlu : D=0x0000000000000000 21808 2957438088269500: system.switch_cpus T0 : @no_context+48.32909 : Microcode_ROM : sub t0, t5, t10 : IntAlu : D=0x0000000000000020 21809 2957438088269750: system.switch_cpus T0 : @no_context+48.32910 : Microcode_ROM : mov t11b, t0b, t0b : IntAlu : D=0x0000000000000000 21810 2957438088270000: system.switch_cpus T0 : @no_context+48.32911 : Microcode_ROM : srli t12, t4, 0x20 : IntAlu : D=0x0000000081a08e00 21811 2957438088270250: system.switch_cpus T0 : @no_context+48.32912 : Microcode_ROM : andi t12, t12, 0x7 : IntAlu : D=0x0000000000000000 21812 2957438088270500: system.switch_cpus T0 : @no_context+48.32913 : Microcode_ROM : subi t0, t12, 0x1 : IntAlu : D=0x0000000000000008 21813 2957438088270750: system.switch_cpus T0 : @no_context+48.32914 : Microcode_ROM : br 0x8096 : No_OpClass : 21814 2957438088271000: system.switch_cpus T0 : @no_context+48.32915 : Microcode_ROM : br 0x8098 : No_OpClass : 21815 2957438088271250: system.switch_cpus T0 : @no_context+48.32916 : Microcode_ROM : mov t6, t6, rsp : IntAlu : D=0xfffffe0000001fe0 21816 2957438088271500: system.switch_cpus T0 : @no_context+48.32917 : Microcode_ROM : br 0x8099 : No_OpClass : 21817 2957438088271750: system.switch_cpus T0 : @no_context+48.32921 : Microcode_ROM : andi t6b, t6b, 0xf0 : IntAlu : D=0xfffffe0000001fe0 21818 2957438088272000: system.switch_cpus T0 : @no_context+48.32922 : Microcode_ROM : subi t6, t6, 0x30 : IntAlu : D=0xfffffe0000001fb0 21819 2957438088272250: system.switch_cpus T0 : @no_context+48.32923 : Microcode_ROM : wrip , t0, t9 : IntAlu : 21820 2957438088272500: system.switch_cpus T0 : @no_context+48.32924 : Microcode_ROM : srli t5, t4, 0x10 : IntAlu : D=0x000081a08e000010 21821 2957438088272750: system.switch_cpus T0 : @no_context+48.32925 : Microcode_ROM : andi t5, t5, 0xff : IntAlu : D=0x0000000000000010 21822 2957438088273000: system.switch_cpus T0 : @no_context+48.32926 : Microcode_ROM : wrdl %ctrl140, t3, t5 : IntAlu : D=0x000000000000abd0 21823 2957438088310500: system.switch_cpus T0 : @no_context+48.32927 : Microcode_ROM : limm t10, 0 : IntAlu : D=0x0000000000000000 21824 2957438088310750: system.switch_cpus T0 : @no_context+48.32928 : Microcode_ROM : rdsel t10w, t10w, %ctrl127 : IntAlu : D=0x0000000000000010 21825 2957438088311000: system.switch_cpus T0 : @no_context+48.32929 : Microcode_ROM : wrsel %ctrl127, t5w, : IntAlu : D=0x0000000000000010 Best, Taeklim ᐧ On Thu, Dec 20, 2018 at 6:12 PM Kleovoulos Kalaitzidis < kleovoulos.kalaitzi...@inria.fr> wrote: > Hello Taeklim, > > your problem sounds to me the same as the one I keep having. In my case, I > searches a bit more and then I found that as you said instruction count > does not increase because execution falls into an infinite loop of the same > page fault (Microcode_ROM related.) I give you here the link to the thread > of my emails when I first asked about the problem : > https://www.mail-archive.com/gem5-users@gem5.org/msg16145.html > Unfortunately, I do not have the solution , but it would be very nice if > you could also just use the flags I mention > (--debug-flags=Exec,LocalApic,Faults) to see if the problem is related with > the same issue. Looking forward for any feedback. > > Regards, > > > -- > Kleovoulos Kalaitzidis > Doctorant - Équipe PACAP > > Centre de recherche INRIA Rennes - Bretagne Atlantique > Bâtiment 12E, Bureau E321, Campus de Beaulieu, > 35042 Rennes Cedex, France > > ------------------------------ > > *From: *"Taeklim Kim" <taek...@uci.edu> > *To: *"gem5 users mailing list" <gem5-users@gem5.org> > *Sent: *Thursday, December 20, 2018 1:12:38 AM > *Subject: *[gem5-users] Problem on restoring checkpoint while using O3CPU > in Full System mode > > Hi all, > I'm currently using X86 Full system mode. > > Firstly, I tried to make a checkpoint while running SPEC CPU by > AtomicSimpleCPU, and I got it. After that, I did restoring checkpoint by > adding an option '--cpu-type=DerivO3CPU', and also added the cache option. > > However, if I run(restoring) by O3CPU, the simulation didn't keep running, > it just hanged and nothing changed. I also added some 'printf()' at > 'src/cpu/o3/cpu.cc', 'FullO3CPU<Impl>::instDone()' to check the count of > instruction, nothing changed. > > I'm also tried just restoring to Atomic, not O3, but in this case, the > simulation works fine. I'm not sure why this is hanging when I restore O3. > Below is the command line that I used for restoring O3. > > /home/workspace/gem5_fs/build/X86/gem5.opt > /home/workspace/gem5_fs/configs/example/fs.py -n 1 > --disk-image=/home/workspace/fs_image/disks/ubuntu-16.04-v3.6.img > --kernel=/home/taeklim/workspace/fs_image/binaries/vmlinux-4.14.53-prof > --sys-clock=1GHz --cpu-clock=4GHz > --mem-size=4096MB --mem-type=DDR3_1600_8x8 --restore-with-cpu=DerivO3CPU > --cpu-type=DerivO3CPU > --caches --checkpoint-dir=/home/workspace/gem5_fs/m5out/ --at-instruction > -r 977530554357000 > > Your help will be appreciated. > > Best, > > Taeklim > > ᐧ > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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