Hi, I found nr_cpus is not calculated properly in 32 bits(x86) at crash-4.0-8.9. Around line 140 in file lkcd_v8.c. 137 * to find out how many CPUs are configured. 138 */ 139 offset = offsetof(dump_header_asm_t, dha_smp_regs[0]); 140 nr_cpus = (hdr_size - offset) / sizeof(dump_CPU_info_t); 141 142 fprintf(stderr, "CPU number NR_CPUS %d \n", NR_CPUS); 143 fprintf(stderr, "header_asm_t size %d \n", sizeof(dump_header_asm_t)); And in the corresponding head file. # cat -n lkcd_dump_v8.h|grep -A 20 434 434 /* smp specific */ 435 uint32_t dha_smp_num_cpus; 436 uint32_t dha_dumping_cpu; 437 struct pt_regs dha_smp_regs[NR_CPUS]; 438 uint32_t dha_smp_current_task[NR_CPUS]; 439 uint32_t dha_stack[NR_CPUS]; 440 uint32_t dha_stack_ptr[NR_CPUS]; 441 } __attribute__((packed)) dump_header_asm_t; 442 443 /* 444 * CPU specific part of dump_header_asm_t 445 */ 446 typedef struct dump_CPU_info_s { 447 struct pt_regs dha_smp_regs; 448 uint64_t dha_smp_current_task; 449 uint64_t dha_stack; 450 uint64_t dha_stack_ptr; 451 } __attribute__ ((packed)) dump_CPU_info_t; 452 453 454 /* As we know, on x86(32 bits), uint32_t is 4 bytes and uint64_t is 8 bytes. So this line 140 nr_cpus = (hdr_size - offset) / sizeof(dump_CPU_info_t); would not get a correct nr_cpus due to the sizeof(). A patch to fix this problem as below. Thanks. -Wj --- lkcd_dump_v8.h.orig 2009-04-16 13:14:22.000000000 -0400 +++ lkcd_dump_v8.h 2009-06-10 03:31:37.815122032 -0400 @@ -445,9 +445,9 @@ typedef struct _dump_header_asm_s { */ typedef struct dump_CPU_info_s { struct pt_regs dha_smp_regs; - uint64_t dha_smp_current_task; - uint64_t dha_stack; - uint64_t dha_stack_ptr; + uint32_t dha_smp_current_task; + uint32_t dha_stack; + uint32_t dha_stack_ptr; } __attribute__ ((packed)) dump_CPU_info_t;