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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB5312 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on: commit: 227a9a48be5d752c0a6854d1454c42fd670c1f3e ("x86/uaccess: Use unsafe wrappers for ASM GOTO") https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git rseq/slice-v2 in testcase: boot config: i386-randconfig-141-20251022 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | 821a44ce12 | 227a9a48be | +---------------------------------------------+------------+------------+ | boot_successes | 18 | 0 | | boot_failures | 0 | 18 | | BUG:unable_to_handle_page_fault_for_address | 0 | 18 | | Oops | 0 | 18 | | EIP:copy_to_kernel_nofault | 0 | 18 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 18 | +---------------------------------------------+------------+------------+ 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/202510231428.d088556-lkp@intel.com [ 16.992248][ T0] BUG: unable to handle page fault for address: ffcb2000 [ 16.994015][ T0] #PF: supervisor write access in kernel mode [ 16.994645][ T0] #PF: error_code(0x0003) - permissions violation [ 16.995321][ T0] *pde = 0326d067 *pte = 0326b121 [ 16.995868][ T0] Oops: Oops: 0003 [#1] SMP [ 16.996321][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.18.0-rc1-00003-g227a9a48be5d #1 PREEMPT [ 16.997384][ T0] EIP: copy_to_kernel_nofault (mm/maccess.c:78 (discriminator 7)) [ 16.997993][ T0] Code: 83 f9 03 76 12 8b 36 89 30 83 e9 04 eb ea 66 8b 36 66 89 30 83 e9 02 89 d8 89 d6 29 c8 29 ce 83 f9 01 77 ea 85 c9 74 04 8a 16 <88> 10 e8 1d fe ff ff 31 c0 eb 11 89 30 eb 03 66 89 30 e8 0d fe ff All code ======== 0: 83 f9 03 cmp $0x3,%ecx 3: 76 12 jbe 0x17 5: 8b 36 mov (%rsi),%esi 7: 89 30 mov %esi,(%rax) 9: 83 e9 04 sub $0x4,%ecx c: eb ea jmp 0xfffffffffffffff8 e: 66 8b 36 mov (%rsi),%si 11: 66 89 30 mov %si,(%rax) 14: 83 e9 02 sub $0x2,%ecx 17: 89 d8 mov %ebx,%eax 19: 89 d6 mov %edx,%esi 1b: 29 c8 sub %ecx,%eax 1d: 29 ce sub %ecx,%esi 1f: 83 f9 01 cmp $0x1,%ecx 22: 77 ea ja 0xe 24: 85 c9 test %ecx,%ecx 26: 74 04 je 0x2c 28: 8a 16 mov (%rsi),%dl 2a:* 88 10 mov %dl,(%rax) <-- trapping instruction 2c: e8 1d fe ff ff call 0xfffffffffffffe4e 31: 31 c0 xor %eax,%eax 33: eb 11 jmp 0x46 35: 89 30 mov %esi,(%rax) 37: eb 03 jmp 0x3c 39: 66 89 30 mov %si,(%rax) 3c: e8 .byte 0xe8 3d: 0d .byte 0xd 3e: fe (bad) 3f: ff .byte 0xff Code starting with the faulting instruction =========================================== 0: 88 10 mov %dl,(%rax) 2: e8 1d fe ff ff call 0xfffffffffffffe24 7: 31 c0 xor %eax,%eax 9: eb 11 jmp 0x1c b: 89 30 mov %esi,(%rax) d: eb 03 jmp 0x12 f: 66 89 30 mov %si,(%rax) 12: e8 .byte 0xe8 13: 0d .byte 0xd 14: fe (bad) 15: ff .byte 0xff [ 17.000167][ T0] EAX: ffcb2000 EBX: ffcb2001 ECX: 00000001 EDX: 82ba9f00 [ 17.000906][ T0] ESI: 82ba9f6b EDI: ee7fdb35 EBP: 82ba9f5c ESP: 82ba9f54 [ 17.001671][ T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210002 [ 17.002508][ T0] CR0: 80050033 CR2: ffcb2000 CR3: 0326a000 CR4: 00000090 [ 17.003279][ T0] Call Trace: [ 17.003638][ T0] mem_init (arch/x86/mm/init_32.c:675 (discriminator 2) arch/x86/mm/init_32.c:720 (discriminator 2)) [ 17.004123][ T0] mm_core_init (mm/mm_init.c:2708) [ 17.004578][ T0] start_kernel (init/main.c:972) [ 17.006783][ T0] i386_start_kernel (arch/x86/kernel/head32.c:79) [ 17.007289][ T0] startup_32_smp (arch/x86/kernel/head_32.S:293) [ 17.007784][ T0] Modules linked in: [ 17.008183][ T0] CR2: 00000000ffcb2000 [ 17.008631][ T0] ---[ end trace 0000000000000000 ]--- [ 17.009250][ T0] EIP: copy_to_kernel_nofault (mm/maccess.c:78 (discriminator 7)) [ 17.009853][ T0] Code: 83 f9 03 76 12 8b 36 89 30 83 e9 04 eb ea 66 8b 36 66 89 30 83 e9 02 89 d8 89 d6 29 c8 29 ce 83 f9 01 77 ea 85 c9 74 04 8a 16 <88> 10 e8 1d fe ff ff 31 c0 eb 11 89 30 eb 03 66 89 30 e8 0d fe ff All code ======== 0: 83 f9 03 cmp $0x3,%ecx 3: 76 12 jbe 0x17 5: 8b 36 mov (%rsi),%esi 7: 89 30 mov %esi,(%rax) 9: 83 e9 04 sub $0x4,%ecx c: eb ea jmp 0xfffffffffffffff8 e: 66 8b 36 mov (%rsi),%si 11: 66 89 30 mov %si,(%rax) 14: 83 e9 02 sub $0x2,%ecx 17: 89 d8 mov %ebx,%eax 19: 89 d6 mov %edx,%esi 1b: 29 c8 sub %ecx,%eax 1d: 29 ce sub %ecx,%esi 1f: 83 f9 01 cmp $0x1,%ecx 22: 77 ea ja 0xe 24: 85 c9 test %ecx,%ecx 26: 74 04 je 0x2c 28: 8a 16 mov (%rsi),%dl 2a:* 88 10 mov %dl,(%rax) <-- trapping instruction 2c: e8 1d fe ff ff call 0xfffffffffffffe4e 31: 31 c0 xor %eax,%eax 33: eb 11 jmp 0x46 35: 89 30 mov %esi,(%rax) 37: eb 03 jmp 0x3c 39: 66 89 30 mov %si,(%rax) 3c: e8 .byte 0xe8 3d: 0d .byte 0xd 3e: fe (bad) 3f: ff .byte 0xff Code starting with the faulting instruction =========================================== 0: 88 10 mov %dl,(%rax) 2: e8 1d fe ff ff call 0xfffffffffffffe24 7: 31 c0 xor %eax,%eax 9: eb 11 jmp 0x1c b: 89 30 mov %esi,(%rax) d: eb 03 jmp 0x12 f: 66 89 30 mov %si,(%rax) 12: e8 .byte 0xe8 13: 0d .byte 0xd 14: fe (bad) 15: ff .byte 0xff The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251023/202510231428.d088556-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki