Hi Nicholas, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y head: 3cb069b52684a615947ba8af15e7c0866b9bb061 commit: 7b9f9ce1a7a0cb5e0e7077c960d08e6039388a9d [9473/9999] powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.4.y git checkout 7b9f9ce1a7a0cb5e0e7077c960d08e6039388a9d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/powerpc/kernel/exceptions-64s.S: Assembler messages: arch/powerpc/kernel/exceptions-64s.S:1599: Warning: invalid register expression arch/powerpc/kernel/exceptions-64s.S:1640: Warning: invalid register expression arch/powerpc/kernel/exceptions-64s.S:840: Error: attempt to move .org backwards arch/powerpc/kernel/exceptions-64s.S:864: Error: attempt to move .org backwards arch/powerpc/kernel/exceptions-64s.S:865: Error: attempt to move .org backwards vim +839 arch/powerpc/kernel/exceptions-64s.S 0ebc4cdaa3fd7c Benjamin Herrenschmidt 2009-06-02 823 c1fb6816fb1b78 Michael Neuling 2012-11-02 824 /* c1fb6816fb1b78 Michael Neuling 2012-11-02 825 * Relocation-on interrupts: A subset of the interrupts can be delivered c1fb6816fb1b78 Michael Neuling 2012-11-02 826 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering c1fb6816fb1b78 Michael Neuling 2012-11-02 827 * it. Addresses are the same as the original interrupt addresses, but c1fb6816fb1b78 Michael Neuling 2012-11-02 828 * offset by 0xc000000000004000. c1fb6816fb1b78 Michael Neuling 2012-11-02 829 * It's impossible to receive interrupts below 0x300 via this mechanism. c1fb6816fb1b78 Michael Neuling 2012-11-02 830 * KVM: None of these traps are from the guest ; anything that escalated c1fb6816fb1b78 Michael Neuling 2012-11-02 831 * to HV=1 from HV=0 is delivered via real mode handlers. c1fb6816fb1b78 Michael Neuling 2012-11-02 832 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 833 c1fb6816fb1b78 Michael Neuling 2012-11-02 834 /* c1fb6816fb1b78 Michael Neuling 2012-11-02 835 * This uses the standard macro, since the original 0x300 vector c1fb6816fb1b78 Michael Neuling 2012-11-02 836 * only has extra guff for STAB-based processors -- which never c1fb6816fb1b78 Michael Neuling 2012-11-02 837 * come here. c1fb6816fb1b78 Michael Neuling 2012-11-02 838 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 @839 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access) c1fb6816fb1b78 Michael Neuling 2012-11-02 840 . = 0x4380 c1fb6816fb1b78 Michael Neuling 2012-11-02 841 .globl data_access_slb_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 842 data_access_slb_relon_pSeries: c1fb6816fb1b78 Michael Neuling 2012-11-02 843 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 844 EXCEPTION_PROLOG_0(PACA_EXSLB) c1fb6816fb1b78 Michael Neuling 2012-11-02 845 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) c1fb6816fb1b78 Michael Neuling 2012-11-02 846 std r3,PACA_EXSLB+EX_R3(r13) c1fb6816fb1b78 Michael Neuling 2012-11-02 847 mfspr r3,SPRN_DAR c1fb6816fb1b78 Michael Neuling 2012-11-02 848 mfspr r12,SPRN_SRR1 c1fb6816fb1b78 Michael Neuling 2012-11-02 849 #ifndef CONFIG_RELOCATABLE b1576fec7f4dd4 Anton Blanchard 2014-02-04 850 b slb_miss_realmode c1fb6816fb1b78 Michael Neuling 2012-11-02 851 #else c1fb6816fb1b78 Michael Neuling 2012-11-02 852 /* ad0289e4acf2bd Anton Blanchard 2014-02-04 853 * We can't just use a direct branch to slb_miss_realmode c1fb6816fb1b78 Michael Neuling 2012-11-02 854 * because the distance from here to there depends on where c1fb6816fb1b78 Michael Neuling 2012-11-02 855 * the kernel ends up being put. c1fb6816fb1b78 Michael Neuling 2012-11-02 856 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 857 mfctr r11 c1fb6816fb1b78 Michael Neuling 2012-11-02 858 ld r10,PACAKBASE(r13) ad0289e4acf2bd Anton Blanchard 2014-02-04 859 LOAD_HANDLER(r10, slb_miss_realmode) c1fb6816fb1b78 Michael Neuling 2012-11-02 860 mtctr r10 c1fb6816fb1b78 Michael Neuling 2012-11-02 861 bctr c1fb6816fb1b78 Michael Neuling 2012-11-02 862 #endif c1fb6816fb1b78 Michael Neuling 2012-11-02 863 c1fb6816fb1b78 Michael Neuling 2012-11-02 864 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access) c1fb6816fb1b78 Michael Neuling 2012-11-02 865 . = 0x4480 c1fb6816fb1b78 Michael Neuling 2012-11-02 866 .globl instruction_access_slb_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 867 instruction_access_slb_relon_pSeries: c1fb6816fb1b78 Michael Neuling 2012-11-02 868 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 869 EXCEPTION_PROLOG_0(PACA_EXSLB) c1fb6816fb1b78 Michael Neuling 2012-11-02 870 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) c1fb6816fb1b78 Michael Neuling 2012-11-02 871 std r3,PACA_EXSLB+EX_R3(r13) c1fb6816fb1b78 Michael Neuling 2012-11-02 872 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ c1fb6816fb1b78 Michael Neuling 2012-11-02 873 mfspr r12,SPRN_SRR1 c1fb6816fb1b78 Michael Neuling 2012-11-02 874 #ifndef CONFIG_RELOCATABLE b1576fec7f4dd4 Anton Blanchard 2014-02-04 875 b slb_miss_realmode c1fb6816fb1b78 Michael Neuling 2012-11-02 876 #else c1fb6816fb1b78 Michael Neuling 2012-11-02 877 mfctr r11 c1fb6816fb1b78 Michael Neuling 2012-11-02 878 ld r10,PACAKBASE(r13) ad0289e4acf2bd Anton Blanchard 2014-02-04 879 LOAD_HANDLER(r10, slb_miss_realmode) c1fb6816fb1b78 Michael Neuling 2012-11-02 880 mtctr r10 c1fb6816fb1b78 Michael Neuling 2012-11-02 881 bctr c1fb6816fb1b78 Michael Neuling 2012-11-02 882 #endif c1fb6816fb1b78 Michael Neuling 2012-11-02 883 c1fb6816fb1b78 Michael Neuling 2012-11-02 884 . = 0x4500 c1fb6816fb1b78 Michael Neuling 2012-11-02 885 .globl hardware_interrupt_relon_pSeries; c1fb6816fb1b78 Michael Neuling 2012-11-02 886 .globl hardware_interrupt_relon_hv; c1fb6816fb1b78 Michael Neuling 2012-11-02 887 hardware_interrupt_relon_pSeries: c1fb6816fb1b78 Michael Neuling 2012-11-02 888 hardware_interrupt_relon_hv: c1fb6816fb1b78 Michael Neuling 2012-11-02 889 BEGIN_FTR_SECTION c1fb6816fb1b78 Michael Neuling 2012-11-02 890 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV) c1fb6816fb1b78 Michael Neuling 2012-11-02 891 FTR_SECTION_ELSE c1fb6816fb1b78 Michael Neuling 2012-11-02 892 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR) 3e96ca7f007ddb Michael Neuling 2013-04-25 893 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) c1fb6816fb1b78 Michael Neuling 2012-11-02 894 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment) c1fb6816fb1b78 Michael Neuling 2012-11-02 895 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check) c1fb6816fb1b78 Michael Neuling 2012-11-02 896 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable) c1fb6816fb1b78 Michael Neuling 2012-11-02 897 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer) c1fb6816fb1b78 Michael Neuling 2012-11-02 898 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer) 1dbdafec5d63a1 Ian Munsie 2012-11-14 899 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super) c1fb6816fb1b78 Michael Neuling 2012-11-02 900 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b) c1fb6816fb1b78 Michael Neuling 2012-11-02 901 c1fb6816fb1b78 Michael Neuling 2012-11-02 902 . = 0x4c00 c1fb6816fb1b78 Michael Neuling 2012-11-02 903 .globl system_call_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 904 system_call_relon_pSeries: c1fb6816fb1b78 Michael Neuling 2012-11-02 905 HMT_MEDIUM c1fb6816fb1b78 Michael Neuling 2012-11-02 906 SYSCALL_PSERIES_1 c1fb6816fb1b78 Michael Neuling 2012-11-02 907 SYSCALL_PSERIES_2_DIRECT c1fb6816fb1b78 Michael Neuling 2012-11-02 908 SYSCALL_PSERIES_3 c1fb6816fb1b78 Michael Neuling 2012-11-02 909 c1fb6816fb1b78 Michael Neuling 2012-11-02 910 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step) c1fb6816fb1b78 Michael Neuling 2012-11-02 911 c1fb6816fb1b78 Michael Neuling 2012-11-02 912 . = 0x4e00 1d567cb4bd42d5 Michael Ellerman 2013-06-25 913 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 914 c1fb6816fb1b78 Michael Neuling 2012-11-02 915 . = 0x4e20 1d567cb4bd42d5 Michael Ellerman 2013-06-25 916 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 917 c1fb6816fb1b78 Michael Neuling 2012-11-02 918 . = 0x4e40 d671ddd6654daf Michael Ellerman 2013-08-15 919 emulation_assist_relon_trampoline: 1707dd161349e6 Paul Mackerras 2013-02-04 920 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 921 EXCEPTION_PROLOG_0(PACA_EXGEN) c1fb6816fb1b78 Michael Neuling 2012-11-02 922 b emulation_assist_relon_hv c1fb6816fb1b78 Michael Neuling 2012-11-02 923 c1fb6816fb1b78 Michael Neuling 2012-11-02 924 . = 0x4e60 1d567cb4bd42d5 Michael Ellerman 2013-06-25 925 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ c1fb6816fb1b78 Michael Neuling 2012-11-02 926 655bb3f4e89225 Ian Munsie 2012-11-14 927 . = 0x4e80 d671ddd6654daf Michael Ellerman 2013-08-15 928 h_doorbell_relon_trampoline: 1707dd161349e6 Paul Mackerras 2013-02-04 929 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 930 EXCEPTION_PROLOG_0(PACA_EXGEN) 655bb3f4e89225 Ian Munsie 2012-11-14 931 b h_doorbell_relon_hv c1fb6816fb1b78 Michael Neuling 2012-11-02 932 c1fb6816fb1b78 Michael Neuling 2012-11-02 933 . = 0x4f00 fa111f1f764783 Michael Ellerman 2013-08-15 934 performance_monitor_relon_pseries_trampoline: 1707dd161349e6 Paul Mackerras 2013-02-04 935 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 936 EXCEPTION_PROLOG_0(PACA_EXGEN) c1fb6816fb1b78 Michael Neuling 2012-11-02 937 b performance_monitor_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 938 c1fb6816fb1b78 Michael Neuling 2012-11-02 939 . = 0x4f20 fa111f1f764783 Michael Ellerman 2013-08-15 940 altivec_unavailable_relon_pseries_trampoline: 1707dd161349e6 Paul Mackerras 2013-02-04 941 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 942 EXCEPTION_PROLOG_0(PACA_EXGEN) c1fb6816fb1b78 Michael Neuling 2012-11-02 943 b altivec_unavailable_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 944 c1fb6816fb1b78 Michael Neuling 2012-11-02 945 . = 0x4f40 fa111f1f764783 Michael Ellerman 2013-08-15 946 vsx_unavailable_relon_pseries_trampoline: 1707dd161349e6 Paul Mackerras 2013-02-04 947 SET_SCRATCH0(r13) 1707dd161349e6 Paul Mackerras 2013-02-04 948 EXCEPTION_PROLOG_0(PACA_EXGEN) c1fb6816fb1b78 Michael Neuling 2012-11-02 949 b vsx_unavailable_relon_pSeries c1fb6816fb1b78 Michael Neuling 2012-11-02 950 d0c0c9a13f6821 Michael Neuling 2013-02-13 951 . = 0x4f60 fa111f1f764783 Michael Ellerman 2013-08-15 952 facility_unavailable_relon_trampoline: d0c0c9a13f6821 Michael Neuling 2013-02-13 953 SET_SCRATCH0(r13) d0c0c9a13f6821 Michael Neuling 2013-02-13 954 EXCEPTION_PROLOG_0(PACA_EXGEN) 021424a1fce335 Michael Ellerman 2013-06-25 955 b facility_unavailable_relon_pSeries d0c0c9a13f6821 Michael Neuling 2013-02-13 956 b14b6260efeee6 Michael Ellerman 2013-06-25 957 . = 0x4f80 fa111f1f764783 Michael Ellerman 2013-08-15 958 hv_facility_unavailable_relon_trampoline: b14b6260efeee6 Michael Ellerman 2013-06-25 959 SET_SCRATCH0(r13) b14b6260efeee6 Michael Ellerman 2013-06-25 960 EXCEPTION_PROLOG_0(PACA_EXGEN) 88f094120bd2f0 Michael Neuling 2013-08-09 961 b hv_facility_unavailable_relon_hv b14b6260efeee6 Michael Ellerman 2013-06-25 962 c1fb6816fb1b78 Michael Neuling 2012-11-02 963 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) c1fb6816fb1b78 Michael Neuling 2012-11-02 964 #ifdef CONFIG_PPC_DENORMALISATION c1fb6816fb1b78 Michael Neuling 2012-11-02 965 . = 0x5500 c1fb6816fb1b78 Michael Neuling 2012-11-02 966 b denorm_exception_hv c1fb6816fb1b78 Michael Neuling 2012-11-02 967 #endif c1fb6816fb1b78 Michael Neuling 2012-11-02 968 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist) c1fb6816fb1b78 Michael Neuling 2012-11-02 969 0ebc4cdaa3fd7c Benjamin Herrenschmidt 2009-06-02 970 .align 7 0ebc4cdaa3fd7c Benjamin Herrenschmidt 2009-06-02 971 system_call_entry: 0ebc4cdaa3fd7c Benjamin Herrenschmidt 2009-06-02 972 b system_call_common 0ebc4cdaa3fd7c Benjamin Herrenschmidt 2009-06-02 973 fe1952fc0afb9a Benjamin Herrenschmidt 2012-03-01 974 ppc64_runlatch_on_trampoline: b1576fec7f4dd4 Anton Blanchard 2014-02-04 975 b __ppc64_runlatch_on fe1952fc0afb9a Benjamin Herrenschmidt 2012-03-01 976 :::::: The code at line 839 was first introduced by commit :::::: c1fb6816fb1b78dd94b673b0fdaa9a7a16e97bd1 powerpc: Add relocation on exception vector handlers :::::: TO: Michael Neuling <mikey(a)neuling.org&gt; :::::: CC: Benjamin Herrenschmidt <benh(a)kernel.crashing.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org