#define PG_arch_1       (9)     // 架构相关页面
#define PG_reserved     (10)    // 保留页面
#define PG_private      (11)    // 私有页面
#define PG_private_2    (12)    // 私有页面2
#define PG_writeback    (13)    // 回写页面
#define PG_head         (14)    // 复合页头部
#define PG_swapcache    (15)    // 交换缓存页面
#define PG_mappedtodisk (16)    // 映射到磁盘的页面
#define PG_reclaim      (17)    // 回收页面
#define PG_swapbacked   (18)    // 交换支持页面
#define PG_unevictable  (19)    // 不可驱逐页面
#define PG_mlocked      (20)    // 内存锁定页面
#define PG_uncached     (21)    // 未缓存页面
#define PG_hwpoison     (22)    // 硬件中毒页面

#define DL_EXCLUDE_ZERO         (0x001)   // 排除零页面
#define DL_EXCLUDE_CACHE        (0x002)   // 排除缓存页面
#define DL_EXCLUDE_CACHE_PRI    (0x004)   // 排除私有缓存页面
#define DL_EXCLUDE_USER_DATA    (0x008)   // 排除用户数据页面
#define DL_EXCLUDE_FREE         (0x010)   // 排除空闲页面

// 检查是否为缓存页面		int is_cache_page(unsigned long flags)
// 检查是否为空闲页面 		int is_free_page(unsigned long flags)
// 检查是否为硬件中毒页面     int is_hwpoison_page(unsigned long flags)
// 检查是否为零页面			 int is_zero_page(char *buf, long page_size)

// 内存范围描述
struct memory_range {
    unsigned long long start;
    unsigned long long end;
};

// 页面描述符相关信息
struct page_desc {
    unsigned long flags;
    unsigned int _count;
    unsigned int _mapcount;
    // ... 其他字段
};

+------------------+  偏移 0
| ELF Header       |  (Elf64_Ehdr 或 Elf32_Ehdr)
+------------------+  
| Program Headers  |  (包含 PT_NOTE + PT_LOAD 段)
+------------------+  
| Section Header   |  (仅在扩展编号时存在)
| (可选)           |
+------------------+  offset_note_dumpfile
| PT_NOTE Segment  |  (包含原始NOTE + 擦除信息)
+------------------+  info->offset_load_dumpfile
| PT_LOAD Segments |  (实际的内存页面数据)
+------------------+

typedef struct {
    uint32_t    p_type;      /* Segment type */
    uint32_t    p_flags;     /* Segment flags */
    uint64_t    p_offset;    /* Segment file offset */
    uint64_t    p_vaddr;     /* Segment virtual address */
    uint64_t    p_paddr;     /* Segment physical address */
    uint64_t    p_filesz;    /* Segment size in file */
    uint64_t    p_memsz;     /* Segment size in memory */
    uint64_t    p_align;     /* Segment alignment */
} Elf64_Phdr;

struct pt_load_segment {
	off_t			file_offset;		// 该段在文件中的偏移位置
	off_t			file_size;			// 该段在文件中的大小
	unsigned long long	phys_start;		// 物理内存起始地址
	unsigned long long	phys_end;		// 物理内存结束地址
	unsigned long long	virt_start;		// 虚拟内存起始地址
	unsigned long long	virt_end;		// 虚拟内存结束地址
};
// Elf64_Phdr 转换为 pt_load_segment
pls->phys_start  = prog->p_paddr;
pls->phys_end    = pls->phys_start + prog->p_memsz;
pls->virt_start  = prog->p_vaddr;
pls->virt_end    = pls->virt_start + prog->p_memsz;
pls->file_offset = prog->p_offset;
pls->file_size   = prog->p_filesz;

/*
 * Page flags
 */
long	PG_lru;
long	PG_private;
long	PG_head;
long	PG_head_mask;
long	PG_swapcache;
long	PG_swapbacked;
long	PG_buddy;
long	PG_slab;
long    PG_hwpoison;
long    PG_hugetlb;

makedumpfile -g vmcoreinfo -x vmlinux

CONFIG_DEBUG_INFO=y

CONFIG_DEBUG_INFO_REDUCED
CONFIG_DEBUG_INFO_COMPRESSED
CONFIG_DEBUG_INFO_SPLIT

CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
CONFIG_DEBUG_INFO_DWARF4 is not set
CONFIG_DEBUG_INFO_DWARF5 is not set

CONFIG_PANIC_ON_OOPS=y
CONFIG_PANIC_ON_OOPS_VALUE=1

# 符号信息
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_KALLSYMS_ABSOLUTE_PERCPU=y

# 
CONFIG_WATCHDOG=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_WATCHDOG_CORE=y
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
CONFIG_WATCHDOG_OPEN_TIMEOUT=0

echo c | tee /proc/sysrq-trigger

insmod soft_lockup.ko

cat /proc/kallsyms # 备用查看kernel信息

struct DumpInfo {
	int32_t		kernel_version;      /* version of first kernel*/
	struct timeval	timestamp;
	struct utsname	system_utsname;

	/*
	 * General info:
	 */
	int		dump_level;          /* current dump level */
	int		max_dump_level;      /* maximum dump level */
	int		num_dump_level;      /* number of dump level */
	int		array_dump_level[NUM_ARRAY_DUMP_LEVEL];
	off_t		size_limit;          /* dump file size limit */
	int		flag_compress;       /* flag of compression */
	int		flag_lzo_support;    /* flag of LZO compression support */
	int		flag_elf_dumpfile;   /* flag of creating ELF dumpfile */
	int		flag_generate_vmcoreinfo;/* flag of generating vmcoreinfo file */
	int		flag_read_vmcoreinfo;    /* flag of reading vmcoreinfo file */
	int		flag_show_usage;     /* flag of showing usage */
	int		flag_show_version;   /* flag of showing version */
	int		flag_check_params;   /* only check parameters */
	int		flag_flatten;        /* flag of outputting flattened
						format to a standard out */
	int		flag_rearrange;      /* flag of creating dumpfile from
						flattened format */
	int		flag_split;	     /* splitting vmcore */
	int		flag_cyclic;	     /* multi-cycle processing is necessary */
	int		flag_usemmap;	     /* /proc/vmcore supports mmap(2) */
	int		flag_reassemble;     /* reassemble multiple dumpfiles into one */
	int		flag_refiltering;    /* refilter from kdump-compressed file */
	int		flag_force;	     /* overwrite existing stuff */
	int		flag_exclude_xen_dom;/* exclude Domain-U from xen-kdump */
	int             flag_dmesg;          /* dump the dmesg log out of the vmcore file */
	int             flag_partial_dmesg;  /* dmesg dump only from the last cleared index*/
	int             flag_mem_usage;  /*show the page number of memory in different use*/
	int		flag_use_printk_log; /* did we read printk_log symbol name? */
	int		flag_use_printk_ringbuffer; /* using lockless printk ringbuffer? */
	int		flag_nospace;	     /* the flag of "No space on device" error */
	int		flag_vmemmap;        /* kernel supports vmemmap address space */
	int		flag_excludevm;      /* -e - excluding unused vmemmap pages */
	int		flag_use_count;      /* _refcount is named _count in struct page */
	int		flag_dry_run;        /* do not create a vmcore file */
	unsigned long	vaddr_for_vtop;      /* virtual address for debugging */
	long		page_size;           /* size of page */
	long		page_shift;
	mdf_pfn_t	max_mapnr;   /* number of page descriptor */
	unsigned long   page_offset;
	unsigned long   section_size_bits;
	unsigned long   max_physmem_bits;
	unsigned long   sections_per_root;
	unsigned long	phys_base;
	unsigned long   kernel_start;
	unsigned long   vmalloc_start;
	unsigned long   vmalloc_end;
	unsigned long	vmemmap_start;
	unsigned long	vmemmap_end;
	int		vmemmap_psize;
	int		vmemmap_cnt;
	struct ppc64_vmemmap	*vmemmap_list;
	unsigned long	kaslr_offset;

	/*
	 * for compound page
	 */
	unsigned int	compound_order_offset;
	unsigned int	compound_dtor_offset;

	/*
	 * Filter config file containing filter commands to filter out kernel
	 * data from vmcore.
	 */
	char		*name_filterconfig;
	FILE		*file_filterconfig;

	/*
	 * Filter config file containing eppic language filtering rules
	 * to filter out kernel data from vmcore
	 */
	char		*name_eppic_config;

	/*
	 * diskdimp info:
	 */
	int		block_order;
	off_t		offset_bitmap1;
	unsigned long	len_bitmap;          /* size of bitmap(1st and 2nd) */
	struct dump_bitmap 		*bitmap1;
	struct dump_bitmap 		*bitmap2;
	struct disk_dump_header		*dump_header;
	struct kdump_sub_header		sub_header;

	/*
	 * ELF header info:
	 */
	unsigned int		num_load_dumpfile;
	size_t			offset_load_dumpfile;

	/*
	 * mem_map info:
	 */
	unsigned int		num_mem_map;
	struct mem_map_data	*mem_map_data;

	int			fd_vmlinux;
	char			*name_vmlinux;

	int			fd_xen_syms;
	char			*name_xen_syms;

	/*
	 * Dump memory image info:
	 */
	int			fd_memory;						// elf fd
	char			*name_memory;				// elf file
	struct disk_dump_header	*dh_memory;
	struct kdump_sub_header	*kh_memory;
	struct dump_bitmap 		*bitmap_memory;
	unsigned long			*valid_pages;

	/*
	 * Dump file info:
	 */
	int			fd_dumpfile;
	char			*name_dumpfile;
	int			num_dumpfile;
	struct splitting_info	*splitting_info;
	struct parallel_info	*parallel_info;

	/*
	 * bitmap info:
	 */
	int			fd_bitmap;
	char			*name_bitmap;

	/*
	 * vmcoreinfo file info:
	 */
	FILE			*file_vmcoreinfo;
	char			*name_vmcoreinfo;	     /* vmcoreinfo file */
	char			release[STRLEN_OSRELEASE];
	int			read_text_vmcoreinfo;

	/*
	 * ELF NOTE section in dump memory image info:
	 */
	off_t			offset_note_dumpfile;

	/*
	 * erased information in dump memory image info:
	 */
	unsigned long           size_elf_eraseinfo;

	/*
	 * for splitting
	 */
	mdf_pfn_t split_start_pfn;
	mdf_pfn_t split_end_pfn;

	/*
	 * for cyclic processing
	 */
	char	           *working_dir;	     /* working directory for bitmap */
	mdf_pfn_t          num_dumpable;
	unsigned long      bufsize_cyclic;
	unsigned long      pfn_cyclic;

	/*
	 * for mmap
	 */
	char	*mmap_buf;
	off_t	mmap_start_offset;
	off_t	mmap_end_offset;
	off_t   mmap_region_size;

	/*
	 * sadump info:
	 */
	int flag_sadump_diskset;
	enum sadump_format_type flag_sadump;         /* sadump format type */
	/*
	 * for filtering free pages managed by buddy system:
	 */
	int (*page_is_buddy)(unsigned long flags, unsigned int _mapcount,
			     unsigned long private, unsigned int _count);
	/*
	 * for cyclic_splitting mode, setup splitblock_size
	 */
	long long splitblock_size;
	/*
	 * for parallel process
	 */
	int num_threads;
	int num_buffers;
	pthread_t **threads;
	struct thread_args *kdump_thread_args;
	struct page_data *page_data_buf;
	struct page_flag **page_flag_buf;
	sem_t page_flag_buf_sem;
	pthread_rwlock_t usemmap_rwlock;
	mdf_pfn_t current_pfn;
	pthread_mutex_t current_pfn_mutex;
	pthread_mutex_t page_data_mutex;
	pthread_mutex_t filter_mutex;
};

OSRELEASE=6.12.8+
PAGESIZE=4096
SYMBOL(mem_section)=ffffffff82f32658
SYMBOL(init_uts_ns)=ffffffff8299e260
SYMBOL(_stext)=ffffffff81000000
SYMBOL(level4_kernel_pgt)=ffffffff82232000
SYMBOL(init_top_pgt)=ffffffff8222e000
SYMBOL(vmlist)=ffffffff82b4f9a8
SYMBOL(node_states)=ffffffff829b89e0
SYMBOL(node_data)=ffffffff82f39be0
SYMBOL(prb)=ffffffff82254510
SYMBOL(clear_seq)=ffffffff82ecc020
SYMBOL(log_buf)=ffffffff82954588
SYMBOL(log_buf_len)=ffffffff82954580
SYMBOL(max_pfn)=ffffffff82ed5628
SYMBOL(high_memory)=ffffffff82ed1c80
SIZE(page)=64
SIZE(mem_section)=16
SIZE(pglist_data)=172608
SIZE(zone)=1536
SIZE(free_area)=88
SIZE(list_head)=16
SIZE(nodemask_t)=128
SIZE(printk_ringbuffer)=88
SIZE(prb_desc)=24
SIZE(printk_info)=88
SIZE(latched_seq)=24
OFFSET(page.flags)=0
OFFSET(page._refcount)=52
OFFSET(page.mapping)=24
OFFSET(page.lru)=8
OFFSET(page._mapcount)=48
OFFSET(page.private)=40
OFFSET(page.compound_head)=8
OFFSET(mem_section.section_mem_map)=0
OFFSET(pglist_data.node_zones)=0
OFFSET(pglist_data.nr_zones)=171552
OFFSET(pglist_data.node_start_pfn)=171560
OFFSET(pglist_data.node_spanned_pages)=171576
OFFSET(zone.free_area)=256
OFFSET(zone.vm_stat)=1344
OFFSET(zone.spanned_pages)=160
OFFSET(free_area.free_list)=0
OFFSET(list_head.next)=0
OFFSET(list_head.prev)=8
OFFSET(vm_struct.addr)=8
OFFSET(vmap_area.va_start)=0
OFFSET(vmap_area.list)=40
OFFSET(printk_ringbuffer.desc_ring)=0
OFFSET(printk_ringbuffer.text_data_ring)=48
OFFSET(prb_desc_ring.count_bits)=0
OFFSET(prb_desc_ring.descs)=8
OFFSET(prb_desc_ring.infos)=16
OFFSET(prb_desc_ring.head_id)=24
OFFSET(prb_desc_ring.tail_id)=32
OFFSET(prb_desc.state_var)=0
OFFSET(prb_desc.text_blk_lpos)=8
OFFSET(prb_data_blk_lpos.begin)=0
OFFSET(prb_data_blk_lpos.next)=8
OFFSET(prb_data_ring.size_bits)=0
OFFSET(prb_data_ring.data)=8
OFFSET(printk_info.ts_nsec)=8
OFFSET(printk_info.text_len)=16
OFFSET(printk_info.caller_id)=20
OFFSET(atomic_long_t.counter)=0
OFFSET(latched_seq.val)=8
OFFSET(uts_namespace.name)=0
LENGTH(node_data)=9223372036854775806
LENGTH(zone.free_area)=11
LENGTH(free_area.free_list)=5
NUMBER(NR_FREE_PAGES)=0
NUMBER(N_ONLINE)=1
NUMBER(PG_lru)=5
NUMBER(PG_private)=14
NUMBER(PG_head_mask)=64
NUMBER(PG_swapcache)=10
NUMBER(PG_swapbacked)=17
SRCFILE(pud_t)=./arch/x86/include/asm/pgtable_types.h