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Thanks! Hello, kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on: commit: 0d7231b62906aa3562554714aa708ac0b452c0a5 ("CFI debug code") https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-integrator.git test in testcase: boot compiler: gcc-12 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +-------------------------------------------------------------+----------+------------+ | | v6.8-rc2 | 0d7231b629 | +-------------------------------------------------------------+----------+------------+ | BUG:unable_to_handle_page_fault_for_address | 0 | 12 | | Oops:#[##] | 0 | 12 | | EIP:string | 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/202403251740.ee5bf6fc-lkp@intel.com [ 121.519073][ T1] BUG: unable to handle page fault for address: 00005554 [ 121.520395][ T1] #PF: supervisor read access in kernel mode [ 121.521184][ T1] #PF: error_code(0x0000) - not-present page [ 121.521184][ T1] *pde = 00000000 [ 121.521184][ T1] Oops: 0000 [#1] [ 121.521184][ T1] CPU: 0 PID: 1 Comm: swapper Tainted: G W N 6.8.0-rc2-00001-g0d7231b62906 #7 [ 121.521184][ T1] EIP: string (lib/vsprintf.c:646 lib/vsprintf.c:728) [ 121.521184][ T1] Code: aa 00 00 00 8d 96 00 f0 ff ff 81 fa 00 e0 ff ff 77 44 8d 3c 08 31 d2 85 c9 75 0f eb 15 90 39 d8 73 02 88 08 40 42 39 f8 74 08 <0f> b6 0c 16 84 c9 75 ec 8b 75 f0 89 d9 89 34 24 8b 75 ec 89 74 24 All code ======== 0: aa stos %al,%es:(%rdi) 1: 00 00 add %al,(%rax) 3: 00 8d 96 00 f0 ff add %cl,-0xfff6a(%rbp) 9: ff 81 fa 00 e0 ff incl -0x1fff06(%rcx) f: ff 77 44 push 0x44(%rdi) 12: 8d 3c 08 lea (%rax,%rcx,1),%edi 15: 31 d2 xor %edx,%edx 17: 85 c9 test %ecx,%ecx 19: 75 0f jne 0x2a 1b: eb 15 jmp 0x32 1d: 90 nop 1e: 39 d8 cmp %ebx,%eax 20: 73 02 jae 0x24 22: 88 08 mov %cl,(%rax) 24: 40 rex 25: 42 39 f8 rex.X cmp %edi,%eax 28: 74 08 je 0x32 2a:* 0f b6 0c 16 movzbl (%rsi,%rdx,1),%ecx <-- trapping instruction 2e: 84 c9 test %cl,%cl 30: 75 ec jne 0x1e 32: 8b 75 f0 mov -0x10(%rbp),%esi 35: 89 d9 mov %ebx,%ecx 37: 89 34 24 mov %esi,(%rsp) 3a: 8b 75 ec mov -0x14(%rbp),%esi 3d: 89 .byte 0x89 3e: 74 24 je 0x64 Code starting with the faulting instruction =========================================== 0: 0f b6 0c 16 movzbl (%rsi,%rdx,1),%ecx 4: 84 c9 test %cl,%cl 6: 75 ec jne 0xfffffffffffffff4 8: 8b 75 f0 mov -0x10(%rbp),%esi b: 89 d9 mov %ebx,%ecx d: 89 34 24 mov %esi,(%rsp) 10: 8b 75 ec mov -0x14(%rbp),%esi 13: 89 .byte 0x89 14: 74 24 je 0x3a [ 121.521184][ T1] EAX: c025fcb6 EBX: c025fcbc ECX: ffffffff EDX: 00000000 [ 121.521184][ T1] ESI: 00005554 EDI: c025fcb5 EBP: c025fc38 ESP: c025fc1c [ 121.521184][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010086 [ 121.521184][ T1] CR0: 80050033 CR2: 00005554 CR3: 0a02f000 CR4: 00040690 [ 121.521184][ T1] Call Trace: [ 121.521184][ T1] ? show_regs (arch/x86/kernel/dumpstack.c:479) [ 121.521184][ T1] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 121.521184][ T1] ? debug_locks_off (lib/debug_locks.c:44) [ 121.521184][ T1] ? oops_enter (kernel/panic.c:571 kernel/panic.c:629) [ 121.521184][ T1] ? page_fault_oops (arch/x86/mm/fault.c:707) [ 121.521184][ T1] ? prb_read (kernel/printk/printk_ringbuffer.c:1817) [ 121.521184][ T1] ? kernelmode_fixup_or_oops+0x90/0xf0 [ 121.521184][ T1] ? __bad_area_nosemaphore+0x131/0x1d8 [ 121.521184][ T1] ? _prb_read_valid (kernel/printk/printk_ringbuffer.c:1852 kernel/printk/printk_ringbuffer.c:1892) [ 121.521184][ T1] ? bad_area_nosemaphore (arch/x86/mm/fault.c:867) [ 121.521184][ T1] ? do_user_addr_fault (arch/x86/mm/fault.c:1478) [ 121.521184][ T1] ? prb_read_valid (kernel/printk/printk_ringbuffer.c:1941) [ 121.521184][ T1] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1515 arch/x86/mm/fault.c:1563) [ 121.521184][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1520) [ 121.521184][ T1] ? handle_exception (arch/x86/entry/entry_32.S:1056) [ 121.521184][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1520) [ 121.521184][ T1] ? string (lib/vsprintf.c:646 lib/vsprintf.c:728) [ 121.521184][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1520) [ 121.521184][ T1] ? string (lib/vsprintf.c:646 lib/vsprintf.c:728) [ 121.521184][ T1] vsnprintf (lib/vsprintf.c:2774) [ 121.521184][ T1] vprintk_store (kernel/printk/printk.c:2187) [ 121.521184][ T1] vprintk_emit (kernel/printk/printk.c:2284) [ 121.521184][ T1] vprintk_default (kernel/printk/printk.c:2319) [ 121.521184][ T1] vprintk (kernel/printk/printk_safe.c:46) [ 121.521184][ T1] _printk (kernel/printk/printk.c:2332) [ 121.521184][ T1] cfi_build_cmd_addr (drivers/mtd/chips/cfi_util.c:60) [ 121.521184][ T1] cfi_send_gen_cmd (drivers/mtd/chips/cfi_util.c:216) [ 121.521184][ T1] cfi_qry_mode_on (drivers/mtd/chips/cfi_util.c:281) [ 121.521184][ T1] cfi_probe_chip (drivers/mtd/chips/cfi_probe.c:117) [ 121.521184][ T1] ? vprintk (kernel/printk/printk_safe.c:46) [ 121.521184][ T1] genprobe_ident_chips (drivers/mtd/chips/gen_probe.c:188 drivers/mtd/chips/gen_probe.c:72) [ 121.521184][ T1] mtd_do_chip_probe (drivers/mtd/chips/gen_probe.c:29) [ 121.521184][ T1] ? _raw_spin_unlock (kernel/locking/spinlock.c:187) [ 121.521184][ T1] cfi_probe (drivers/mtd/chips/cfi_probe.c:441) [ 121.521184][ T1] do_map_probe (drivers/mtd/chips/chipreg.c:68) [ 121.521184][ T1] ? vprintk (kernel/printk/printk_safe.c:46) [ 121.521184][ T1] ? init_pcmciamtd (drivers/mtd/maps/sbc_gxx.c:182) [ 121.521184][ T1] init_sbc_gxx (drivers/mtd/maps/sbc_gxx.c:205) [ 121.521184][ T1] do_one_initcall (init/main.c:1236) [ 121.521184][ T1] ? parameq (kernel/params.c:90 kernel/params.c:99) [ 121.521184][ T1] do_initcalls (init/main.c:1297 init/main.c:1314) [ 121.521184][ T1] ? rdinit_setup (init/main.c:1284) [ 121.521184][ T1] ? rest_init (init/main.c:1433) [ 121.521184][ T1] kernel_init_freeable (init/main.c:1333) [ 121.521184][ T1] kernel_init (init/main.c:1443) [ 121.521184][ T1] ? schedule_tail (kernel/sched/core.c:5338) [ 121.521184][ T1] ret_from_fork (arch/x86/kernel/process.c:153) [ 121.521184][ T1] ? rest_init (init/main.c:1433) [ 121.521184][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:741) [ 121.521184][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:947) [ 121.521184][ T1] Modules linked in: [ 121.521184][ T1] CR2: 0000000000005554 [ 121.521184][ T1] ---[ end trace 0000000000000000 ]--- [ 121.521184][ T1] EIP: string (lib/vsprintf.c:646 lib/vsprintf.c:728) [ 121.521184][ T1] Code: aa 00 00 00 8d 96 00 f0 ff ff 81 fa 00 e0 ff ff 77 44 8d 3c 08 31 d2 85 c9 75 0f eb 15 90 39 d8 73 02 88 08 40 42 39 f8 74 08 <0f> b6 0c 16 84 c9 75 ec 8b 75 f0 89 d9 89 34 24 8b 75 ec 89 74 24 All code ======== 0: aa stos %al,%es:(%rdi) 1: 00 00 add %al,(%rax) 3: 00 8d 96 00 f0 ff add %cl,-0xfff6a(%rbp) 9: ff 81 fa 00 e0 ff incl -0x1fff06(%rcx) f: ff 77 44 push 0x44(%rdi) 12: 8d 3c 08 lea (%rax,%rcx,1),%edi 15: 31 d2 xor %edx,%edx 17: 85 c9 test %ecx,%ecx 19: 75 0f jne 0x2a 1b: eb 15 jmp 0x32 1d: 90 nop 1e: 39 d8 cmp %ebx,%eax 20: 73 02 jae 0x24 22: 88 08 mov %cl,(%rax) 24: 40 rex 25: 42 39 f8 rex.X cmp %edi,%eax 28: 74 08 je 0x32 2a:* 0f b6 0c 16 movzbl (%rsi,%rdx,1),%ecx <-- trapping instruction 2e: 84 c9 test %cl,%cl 30: 75 ec jne 0x1e 32: 8b 75 f0 mov -0x10(%rbp),%esi 35: 89 d9 mov %ebx,%ecx 37: 89 34 24 mov %esi,(%rsp) 3a: 8b 75 ec mov -0x14(%rbp),%esi 3d: 89 .byte 0x89 3e: 74 24 je 0x64 Code starting with the faulting instruction =========================================== 0: 0f b6 0c 16 movzbl (%rsi,%rdx,1),%ecx 4: 84 c9 test %cl,%cl 6: 75 ec jne 0xfffffffffffffff4 8: 8b 75 f0 mov -0x10(%rbp),%esi b: 89 d9 mov %ebx,%ecx d: 89 34 24 mov %esi,(%rsp) 10: 8b 75 ec mov -0x14(%rbp),%esi 13: 89 .byte 0x89 14: 74 24 je 0x3a The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240325/202403251740.ee5bf6fc-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki