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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Aug 2023 07:59:40.3150 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: r1NiaEyVVB6fEP2SJm8zchDxUHwPfb/6vrp07gWXHJL4s+zzwT6DfIEYR1wv8AJASPqjfi152yprsp+VrQF4cA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR11MB4527 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on: commit: 7f1f6ace4ce1c337bb7c10592ba522e8a91836e3 ("x86/microcode/32: Move early loading after paging enable") https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git x86/microcode in testcase: boot compiler: clang-16 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | d2700f4067 | 7f1f6ace4c | +---------------------------------------------+------------+------------+ | boot_successes | 13 | 0 | | boot_failures | 0 | 12 | | BUG:unable_to_handle_page_fault_for_address | 0 | 12 | | Oops:#[##] | 0 | 12 | | EIP:load_ucode_ap | 0 | 12 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 | +---------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202308291502.2d535a18-oliver.sang@intel.com [ 0.139017][ T0] BUG: unable to handle page fault for address: 027025c4 [ 0.139017][ T0] #PF: supervisor read access in kernel mode [ 0.139017][ T0] #PF: error_code(0x0000) - not-present page [ 0.139017][ T0] *pde = 00000000 [ 0.139017][ T0] Oops: 0000 [#1] PREEMPT SMP [ 0.139017][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.5.0-rc3-00012-g7f1f6ace4ce1 #1 0b760317710af5cd94fc9e004982f482d14400de [ 0.139017][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 0.139017][ T0] EIP: load_ucode_ap (arch/x86/kernel/cpu/microcode/core.c:177 arch/x86/kernel/cpu/microcode/core.c:187) [ 0.139017][ T0] Code: c2 a1 34 69 ce c2 eb c7 83 c4 04 5e 5f 5b 5d c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc 3e 8d 74 26 00 55 89 e5 53 57 56 <80> 3d c4 25 70 02 00 74 05 5e 5f 5b 5d c3 b8 01 00 00 00 31 c9 0f All code ======== 0: c2 a1 34 retq $0x34a1 3: 69 ce c2 eb c7 83 imul $0x83c7ebc2,%esi,%ecx 9: c4 (bad) a: 04 5e add $0x5e,%al c: 5f pop %rdi d: 5b pop %rbx e: 5d pop %rbp f: c3 retq 10: 00 00 add %al,(%rax) 12: cc int3 13: cc int3 14: 00 00 add %al,(%rax) 16: cc int3 17: cc int3 18: 00 00 add %al,(%rax) 1a: cc int3 1b: cc int3 1c: 00 00 add %al,(%rax) 1e: cc int3 1f: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi 24: 55 push %rbp 25: 89 e5 mov %esp,%ebp 27: 53 push %rbx 28: 57 push %rdi 29: 56 push %rsi 2a:* 80 3d c4 25 70 02 00 cmpb $0x0,0x27025c4(%rip) # 0x27025f5 <-- trapping instruction 31: 74 05 je 0x38 33: 5e pop %rsi 34: 5f pop %rdi 35: 5b pop %rbx 36: 5d pop %rbp 37: c3 retq 38: b8 01 00 00 00 mov $0x1,%eax 3d: 31 c9 xor %ecx,%ecx 3f: 0f .byte 0xf Code starting with the faulting instruction =========================================== 0: 80 3d c4 25 70 02 00 cmpb $0x0,0x27025c4(%rip) # 0x27025cb 7: 74 05 je 0xe 9: 5e pop %rsi a: 5f pop %rdi b: 5b pop %rbx c: 5d pop %rbp d: c3 retq e: b8 01 00 00 00 mov $0x1,%eax 13: 31 c9 xor %ecx,%ecx 15: 0f .byte 0xf [ 0.139017][ T0] EAX: 00000000 EBX: 01020800 ECX: ff008983 EDX: ff000000 [ 0.139017][ T0] ESI: 00000000 EDI: 00000000 EBP: c405df9c ESP: c405df90 [ 0.139017][ T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 [ 0.139017][ T0] CR0: 80050033 CR2: 027025c4 CR3: 02cdf000 CR4: 00000090 [ 0.139017][ T0] Call Trace: [ 0.139017][ T0] ? __die_body (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420) [ 0.139017][ T0] ? __die (arch/x86/kernel/dumpstack.c:434) [ 0.139017][ T0] ? page_fault_oops (arch/x86/mm/fault.c:703) [ 0.139017][ T0] ? kernelmode_fixup_or_oops (arch/x86/mm/fault.c:761) [ 0.139017][ T0] ? __bad_area_nosemaphore (arch/x86/mm/fault.c:817) [ 0.139017][ T0] ? bad_area_nosemaphore (arch/x86/mm/fault.c:866) [ 0.139017][ T0] ? do_user_addr_fault (arch/x86/mm/fault.c:?) [ 0.139017][ T0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1494 arch/x86/mm/fault.c:1542) [ 0.139017][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1499) [ 0.139017][ T0] ? handle_exception (init_task.c:?) [ 0.139017][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1499) [ 0.139017][ T0] ? load_ucode_ap (arch/x86/kernel/cpu/microcode/core.c:177 arch/x86/kernel/cpu/microcode/core.c:187) [ 0.139017][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1499) [ 0.139017][ T0] ? load_ucode_ap (arch/x86/kernel/cpu/microcode/core.c:177 arch/x86/kernel/cpu/microcode/core.c:187) [ 0.139017][ T0] start_secondary (arch/x86/kernel/smpboot.c:283) [ 0.139017][ T0] startup_32_smp (??:?) [ 0.139017][ T0] Modules linked in: [ 0.139017][ T0] CR2: 00000000027025c4 [ 0.139017][ T0] ---[ end trace 0000000000000000 ]--- [ 0.139017][ T0] EIP: load_ucode_ap (arch/x86/kernel/cpu/microcode/core.c:177 arch/x86/kernel/cpu/microcode/core.c:187) [ 0.139017][ T0] Code: c2 a1 34 69 ce c2 eb c7 83 c4 04 5e 5f 5b 5d c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc 3e 8d 74 26 00 55 89 e5 53 57 56 <80> 3d c4 25 70 02 00 74 05 5e 5f 5b 5d c3 b8 01 00 00 00 31 c9 0f All code ======== 0: c2 a1 34 retq $0x34a1 3: 69 ce c2 eb c7 83 imul $0x83c7ebc2,%esi,%ecx 9: c4 (bad) a: 04 5e add $0x5e,%al c: 5f pop %rdi d: 5b pop %rbx e: 5d pop %rbp f: c3 retq 10: 00 00 add %al,(%rax) 12: cc int3 13: cc int3 14: 00 00 add %al,(%rax) 16: cc int3 17: cc int3 18: 00 00 add %al,(%rax) 1a: cc int3 1b: cc int3 1c: 00 00 add %al,(%rax) 1e: cc int3 1f: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi 24: 55 push %rbp 25: 89 e5 mov %esp,%ebp 27: 53 push %rbx 28: 57 push %rdi 29: 56 push %rsi 2a:* 80 3d c4 25 70 02 00 cmpb $0x0,0x27025c4(%rip) # 0x27025f5 <-- trapping instruction 31: 74 05 je 0x38 33: 5e pop %rsi 34: 5f pop %rdi 35: 5b pop %rbx 36: 5d pop %rbp 37: c3 retq 38: b8 01 00 00 00 mov $0x1,%eax 3d: 31 c9 xor %ecx,%ecx 3f: 0f .byte 0xf Code starting with the faulting instruction =========================================== 0: 80 3d c4 25 70 02 00 cmpb $0x0,0x27025c4(%rip) # 0x27025cb 7: 74 05 je 0xe 9: 5e pop %rsi a: 5f pop %rdi b: 5b pop %rbx c: 5d pop %rbp d: c3 retq e: b8 01 00 00 00 mov $0x1,%eax 13: 31 c9 xor %ecx,%ecx 15: 0f .byte 0xf The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20230829/202308291502.2d535a18-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki