Re: [Crash-utility] crash on arm64

Hello I am getting the following error when I use crash on arm64 platform (NXP LS1043A, with 4 A53 cores). crash: read error: kernel virtual address: ffff00007b616100 type: "memory section root table" Additional information is that when I boot the kernel with nokaslr in bootargs, the crash seems to work well. Have any one else seen similar issue? The kernel version is top of mainline with the below patch applied: - arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo (http://lists.infradead.org/pipermail/kexec/2019-November/023962.html) And the crash-utils is from here: https://github.com/crash-utility/crash.git commit 5e975dd8c817ea6aea35e1e15b83c378aee9c136 Author: Dave Anderson <anderson(a)redhat.com&gt; Date: Tue Dec 24 08:43:52 2019 -0500 When determining the ARM64 kernel's "vabits_actual" value by reading the new TCR_EL1.T1SZ vmcoreinfo entry, display its value during session initialization only when invoking crash with "-d1" or larger -d debug value. (anderson(a)redhat.com)

Logs of crash -d1 are below: nxa19049@lsv03080:~/data/ups/crash$ ./crash -d1 ../linux/vmlinux ../linux/vmcore crash 7.2.7++ Copyright (C) 2002-2019  Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation Copyright (C) 1999-2006  Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited Copyright (C) 2006, 2007  VA Linux Systems Japan K.K. Copyright (C) 2005, 2011  NEC Corporation Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions.  Enter "help copying" to see the conditions. This program has absolutely no warranty.  Enter "help warranty" for details. vmcore_data:                   flags: c0 (KDUMP_LOCAL|KDUMP_ELF64)                    ndfd: 3                     ofp: 7fa9998cf620             header_size: 8192    num_pt_load_segments: 4      pt_load_segment[0]:             file_offset: 2000              phys_start: 82080000                phys_end: 839bc000               zero_fill: 0      pt_load_segment[1]:             file_offset: 193e000              phys_start: 80000000                phys_end: d8000000               zero_fill: 0      pt_load_segment[2]:             file_offset: 5993e000              phys_start: fb000000                phys_end: fb800000               zero_fill: 0      pt_load_segment[3]:             file_offset: 5a13e000              phys_start: fbc00000                phys_end: fbe00000               zero_fill: 0              elf_header: 2724410                   elf32: 0                 notes32: 0                  load32: 0                   elf64: 2724410                 notes64: 2724450                  load64: 2724488                sect0_64: 0             nt_prstatus: 2725410             nt_prpsinfo: 0           nt_taskstruct: 0             task_struct: 0              arch_data1: (unused)              arch_data2: (unused)            switch_stack: 0               page_size: 4096          xen_kdump_data: (unused)      num_prstatus_notes: 4          num_qemu_notes: 0              vmcoreinfo: 2725a98         size_vmcoreinfo: 1939      nt_prstatus_percpu:         0000000002725410 00000000027255ac 0000000002725748 00000000027258e4          nt_qemu_percpu:        backup_src_start: 0         backup_src_size: 0           backup_offset: 0 Elf64_Ehdr:                 e_ident: \177ELF       e_ident[EI_CLASS]: 2 (ELFCLASS64)        e_ident[EI_DATA]: 1 (ELFDATA2LSB)     e_ident[EI_VERSION]: 1 (EV_CURRENT)       e_ident[EI_OSABI]: 0 (ELFOSABI_SYSV) e_ident[EI_ABIVERSION]: 0                  e_type: 4 (ET_CORE)               e_machine: 183 (EM_AARCH64)               e_version: 1 (EV_CURRENT)                 e_entry: 0                 e_phoff: 40                 e_shoff: 0                 e_flags: 0                e_ehsize: 40             e_phentsize: 38                 e_phnum: 5             e_shentsize: 0                 e_shnum: 0              e_shstrndx: 0 Elf64_Phdr:                  p_type: 4 (PT_NOTE)                p_offset: 4096 (1000)                 p_vaddr: 0                 p_paddr: 0                p_filesz: 3612 (e1c)                 p_memsz: 3612 (e1c)                 p_flags: 0 ()                 p_align: 0 Elf64_Phdr:                  p_type: 1 (PT_LOAD)                p_offset: 8192 (2000)                 p_vaddr: ffffd3ebfa480000                 p_paddr: 82080000                p_filesz: 26460160 (193c000)                 p_memsz: 26460160 (193c000)                 p_flags: 7 (PF_X|PF_W|PF_R)                 p_align: 0 Elf64_Phdr:                  p_type: 1 (PT_LOAD)                p_offset: 26468352 (193e000)                 p_vaddr: ffff000000000000                 p_paddr: 80000000                p_filesz: 1476395008 (58000000)                 p_memsz: 1476395008 (58000000)                 p_flags: 7 (PF_X|PF_W|PF_R)                 p_align: 0 Elf64_Phdr:                  p_type: 1 (PT_LOAD)                p_offset: 1502863360 (5993e000)                 p_vaddr: ffff00007b000000                 p_paddr: fb000000                p_filesz: 8388608 (800000)                 p_memsz: 8388608 (800000)                 p_flags: 7 (PF_X|PF_W|PF_R)                 p_align: 0 Elf64_Phdr:                  p_type: 1 (PT_LOAD)                p_offset: 1511251968 (5a13e000)                 p_vaddr: ffff00007bc00000                 p_paddr: fbc00000                p_filesz: 2097152 (200000)                 p_memsz: 2097152 (200000)                 p_flags: 7 (PF_X|PF_W|PF_R)                 p_align: 0 Elf64_Nhdr:                n_namesz: 5 ("CORE")                n_descsz: 392                  n_type: 1 (NT_PRSTATUS)                          si.signo: 0  si.code: 0  si.errno: 0                          cursig: 0  sigpend: 0  sighold: 0                          pid: 0  ppid: 0  pgrp: 0  sid:0                          utime: 0.000000  stime: 0.000000                          cutime: 0.000000  cstime: 0.000000                           X0: 00000000000000e0   X1: ffff00007b5c4d80   X2:                           ffff                                                                                                                                        2c147fdf5000                           X3: 000000000007b688   X4: 0000000000000015   X5:                           00ff                                                                                                                                        ffffffffffff                           X6: 0000000035f70457   X7: 0000000000000000   X8:                           ffff                                                                                                                                        00007b5c3e3c                           X9: 00000000000041b3  X10: ffff00007b5c3e1c  X11:                           0000                                                                                                                                        0000000325d3                          X12: 00000000000325d3  X13: 071c71c71c71c71c  X14:                          0000                                                                                                                                       000000000000                          X15: 0000000000000000  X16: 0000000000000000  X17:                          0000                                                                                                                                       000000000000                          X18: 0000000000000000  X19: 0000001e69146f40  X20:                          ffff                                                                                                                                       000053175800                          X21: 0000000000000001  X22: ffff00007b5c3b00  X23:                          0000                                                                                                                                       000000000001                          X24: 0000001e633ee5f0  X25: ffff00007b5c3b00  X26:                          ffff                                                                                                                                       000053175800                          X27: 0000000000000001  X28: 0000000082c16344  X29:                          ffff                                                                                                                                       d3ebfbb73e50                           LR: ffffd3ebfadbbab0   SP: ffffd3ebfbb73e50   PC:                           ffff                                                                                                                                        d3ebfadbbab8                          PSTATE: 60000005   FPVALID: 00000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          00000000000000e0 ffff00007b5c4d80                          ffff2c147fdf5000 000000000007b688                          0000000000000015 00ffffffffffffff                          0000000035f70457 0000000000000000                          ffff00007b5c3e3c 00000000000041b3                          ffff00007b5c3e1c 00000000000325d3                          00000000000325d3 071c71c71c71c71c                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000001e69146f40                          ffff000053175800 0000000000000001                          ffff00007b5c3b00 0000000000000001                          0000001e633ee5f0 ffff00007b5c3b00                          ffff000053175800 0000000000000001                          0000000082c16344 ffffd3ebfbb73e50                          ffffd3ebfadbbab0 ffffd3ebfbb73e50                          ffffd3ebfadbbab8 0000000060000005                          0000000000000000 Elf64_Nhdr:                n_namesz: 5 ("CORE")                n_descsz: 392                  n_type: 1 (NT_PRSTATUS)                          si.signo: 0  si.code: 0  si.errno: 0                          cursig: 0  sigpend: 0  sighold: 0                          pid: 0  ppid: 0  pgrp: 0  sid:0                          utime: 0.000000  stime: 0.000000                          cutime: 0.000000  cstime: 0.000000                           X0: 00000000000000e0   X1: ffff00007b5dad80   X2:                           ffff                                                                                                                                        2c147fe0b000                           X3: 000000000007b688   X4: 0000000000000015   X5:                           00ff                                                                                                                                        ffffffffffff                           X6: 0000000035f70457   X7: 0000000000000000   X8:                           ffff                                                                                                                                        00007b5d9e3c                           X9: 0000000000000db6  X10: ffff00007b5d9e1c  X11:                           0000                                                                                                                                        000000085aa2                          X12: 0000000000085aa2  X13: 071c71c71c71c71c  X14:                          0000                                                                                                                                       000000000000                          X15: 0000000000000000  X16: 0000000000000000  X17:                          0000                                                                                                                                       000000000000                          X18: 0000000000000000  X19: 0000001e69147148  X20:                          ffff                                                                                                                                       000053176000                          X21: 0000000000000001  X22: ffff00007b5d9b00  X23:                          0000                                                                                                                                       000000000001                          X24: 0000001e599e8230  X25: ffff00007b5d9b00  X26:                          ffff                                                                                                                                       000053176000                          X27: 0000000000000001  X28: 0000000000000000  X29:                          ffff                                                                                                                                       800010083ec0                           LR: ffffd3ebfadbbab0   SP: ffff800010083ec0   PC:                           ffff                                                                                                                                        d3ebfadbbab8                          PSTATE: 60000005   FPVALID: 00000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          00000000000000e0 ffff00007b5dad80                          ffff2c147fe0b000 000000000007b688                          0000000000000015 00ffffffffffffff                          0000000035f70457 0000000000000000                          ffff00007b5d9e3c 0000000000000db6                          ffff00007b5d9e1c 0000000000085aa2                          0000000000085aa2 071c71c71c71c71c                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000001e69147148                          ffff000053176000 0000000000000001                          ffff00007b5d9b00 0000000000000001                          0000001e599e8230 ffff00007b5d9b00                          ffff000053176000 0000000000000001                         0000000000000000 ffff800010083ec0                          ffffd3ebfadbbab0 ffff800010083ec0                          ffffd3ebfadbbab8 0000000060000005                          0000000000000000 Elf64_Nhdr:                n_namesz: 5 ("CORE")                n_descsz: 392                  n_type: 1 (NT_PRSTATUS)                          si.signo: 0  si.code: 0  si.errno: 0                          cursig: 0  sigpend: 0  sighold: 0                          pid: 0  ppid: 0  pgrp: 0  sid:0                          utime: 0.000000  stime: 0.000000                          cutime: 0.000000  cstime: 0.000000                           X0: 00000000000000e0   X1: ffff00007b5f0d80   X2:                           ffff                                                                                                                                        2c147fe21000                           X3: 000000000007b688   X4: 0000000000000015   X5:                           00ff                                                                                                                                        ffffffffffff                           X6: 0000000035f70457   X7: 0000000000000000   X8:                           ffff                                                                                                                                        00007b5efe3c                           X9: ffff80001008beb0  X10: ffff00007b5efe1c  X11:                           0000                                                                                                                                        00000000466e                          X12: 000000000000466e  X13: 071c71c71c71c71c  X14:                          0000                                                                                                                                       000000000000                          X15: 0000000000000000  X16: 0000000000000000  X17:                          0000                                                                                                                                       000000000000                          X18: 0000000000000000  X19: 0000001e69147148  X20:                          ffff                                                                                                                                       000053176800                          X21: 0000000000000001  X22: ffff00007b5efb00  X23:                          0000                                                                                                                                       000000000001                          X24: 0000001e68f584b8  X25: ffff00007b5efb00  X26:                          ffff                                                                                                                                       000053176800                          X27: 0000000000000001  X28: 0000000000000000  X29:                          ffff                                                                                                                                       80001008bec0                           LR: ffffd3ebfadbbab0   SP: ffff80001008bec0   PC:                           ffff                                                                                                                                        d3ebfadbbab8                          PSTATE: 60000005   FPVALID: 00000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          00000000000000e0 ffff00007b5f0d80                          ffff2c147fe21000 000000000007b688                          0000000000000015 00ffffffffffffff                          0000000035f70457 0000000000000000                          ffff00007b5efe3c ffff80001008beb0                          ffff00007b5efe1c 000000000000466e                          000000000000466e 071c71c71c71c71c                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000001e69147148                          ffff000053176800 0000000000000001                          ffff00007b5efb00 0000000000000001                          0000001e68f584b8 ffff00007b5efb00                          ffff000053176800 0000000000000001                          0000000000000000 ffff80001008bec0                          ffffd3ebfadbbab0 ffff80001008bec0                          ffffd3ebfadbbab8 0000000060000005                          0000000000000000 Elf64_Nhdr:                n_namesz: 5 ("CORE")                n_descsz: 392                  n_type: 1 (NT_PRSTATUS)                          si.signo: 0  si.code: 0  si.errno: 0                          cursig: 0  sigpend: 0  sighold: 0                          pid: 884  ppid: 0  pgrp: 0  sid:0                          utime: 0.000000  stime: 0.000000                          cutime: 0.000000  cstime: 0.000000                           X0: ffff00004de23400   X1: 0000000000000000   X2:                           ffff                                                                                                                                        00004f58c600                           X3: 0000000000000000   X4: ffffd3ebfbb954b8   X5:                           ffff                                                                                                                                        00004f58c600                           X6: 0000000000000001   X7: ffff8000102fbbe0   X8:                           0000                                                                                                                                        000000000146                           X9: 00000000ffffffd0  X10: ffffd3ebfbb7a120  X11:                           0000                                                                                                                                        000005f5e0ff                          X12: ffffd3ebfbb90000  X13: ffff8000102fb8f5  X14:                          ffff                                                                                                                                       8000902fb8e7                          X15: ffffd3ebfbb798c8  X16: 0000000000000000  X17:                          0000                                                                                                                                       000000000000                          X18: ffffffffffffffff  X19: ffffd3ebfbb79000  X20:                          ffff                                                                                                                                       d3ebfbb95000                          X21: 0000000000000000  X22: ffffd3ebfbd7a000  X23:                          ffff                                                                                                                                       8000102fbaf8                          X24: 0000000000000004  X25: 0000000000000000  X26:                          ffff                                                                                                                                       d3ebfbce4000                          X27: 0000000000000000  X28: ffff00004f58c600  X29:                          ffff                                                                                                                                       8000102fbab0                           LR: ffffd3ebfa58ded8   SP: ffff8000102fbab0   PC:                           ffff                                                                                                                                        d3ebfa58df5c                          PSTATE: 60000085   FPVALID: 00000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000374 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          0000000000000000 0000000000000000                          ffff00004de23400 0000000000000000                          ffff00004f58c600 0000000000000000                          ffffd3ebfbb954b8 ffff00004f58c600                          0000000000000001 ffff8000102fbbe0                          0000000000000146 00000000ffffffd0                          ffffd3ebfbb7a120 0000000005f5e0ff                          ffffd3ebfbb90000 ffff8000102fb8f5                          ffff8000902fb8e7 ffffd3ebfbb798c8                          0000000000000000 0000000000000000                         ffffffffffffffff ffffd3ebfbb79000                          ffffd3ebfbb95000 0000000000000000                          ffffd3ebfbd7a000 ffff8000102fbaf8                          0000000000000004 0000000000000000                          ffffd3ebfbce4000 0000000000000000                          ffff00004f58c600 ffff8000102fbab0                          ffffd3ebfa58ded8 ffff8000102fbab0                          ffffd3ebfa58df5c 0000000060000085                          0000000000000000 Elf64_Nhdr:                n_namesz: 11 ("VMCOREINFO")                n_descsz: 1939                  n_type: 0 (unused)                          OSRELEASE=5.5.0-rc4-00068-gf8631e1                          PAGESIZE=4096                          SYMBOL(init_uts_ns)=ffffd3ebfbb81bf8                          SYMBOL(node_online_map)=ffffd3ebfbb7a3e8                          SYMBOL(swapper_pg_dir)=ffffd3ebfb67a000                          SYMBOL(_stext)=ffffd3ebfa481000                          SYMBOL(vmap_area_list)=ffffd3ebfbb9b258                          SYMBOL(mem_section)=ffff00007b616100                          LENGTH(mem_section)=1024                          SIZE(mem_section)=16                          OFFSET(mem_section.section_mem_map)=0                          SIZE(page)=64                          SIZE(pglist_data)=7936                          SIZE(zone)=1664                          SIZE(free_area)=104                          SIZE(list_head)=16                          SIZE(nodemask_t)=8                          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_dtor)=16                          OFFSET(page.compound_order)=17                          OFFSET(page.compound_head)=8                          OFFSET(pglist_data.node_zones)=0                          OFFSET(pglist_data.nr_zones)=7200                          OFFSET(pglist_data.node_start_pfn)=7208                          OFFSET(pglist_data.node_spanned_pages)=7224                          OFFSET(pglist_data.node_id)=7232                          OFFSET(zone.free_area)=192                          OFFSET(zone.vm_stat)=1472                          OFFSET(zone.spanned_pages)=112                          OFFSET(free_area.free_list)=0                          OFFSET(list_head.next)=0                          OFFSET(list_head.prev)=8                          OFFSET(vmap_area.va_start)=0                          OFFSET(vmap_area.list)=40                          LENGTH(zone.free_area)=11                          SYMBOL(log_buf)=ffffd3ebfbb90b40                          SYMBOL(log_buf_len)=ffffd3ebfbb90b38                          SYMBOL(log_first_idx)=ffffd3ebfbd5566c                          SYMBOL(clear_idx)=ffffd3ebfbd55678                          SYMBOL(log_next_idx)=ffffd3ebfbd55668                          SIZE(printk_log)=16                          OFFSET(printk_log.ts_nsec)=0                          OFFSET(printk_log.len)=8                          OFFSET(printk_log.text_len)=10                          OFFSET(printk_log.dict_len)=12                          LENGTH(free_area.free_list)=6                          NUMBER(NR_FREE_PAGES)=0                          NUMBER(PG_lru)=4                          NUMBER(PG_private)=13                          NUMBER(PG_swapcache)=10                          NUMBER(PG_swapbacked)=19                          NUMBER(PG_slab)=9                          NUMBER(PG_hwpoison)=22                          NUMBER(PG_head_mask)=65536                          NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE)=-129                          NUMBER(HUGETLB_PAGE_DTOR)=2                          NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE)=-257                          NUMBER(VA_BITS)=48                          NUMBER(kimage_voffset)=0xffffd3eb78400000                          NUMBER(PHYS_OFFSET)=0xffffafb780000000                          NUMBER(tcr_el1_t1sz)=0x10                          KERNELOFFSET=53ebea400000                          CRASHTIME=1517155176 readmem: read_kdump() KASLR:   _stext from vmlinux: ffff800010081000   _stext from vmcoreinfo: ffffd3ebfa481000   relocate: 53ebea400000 (87998116MB) crash: pv_ops exists: ARCH_PVOPS vmcoreinfo : vabits_actual: 48 using ffffafb780000000 as phys_offset kimage_voffset: ffffd3eb78400000 phys_offset: ffffafb780000000 gdb ../linux/vmlinux GNU gdb (GDB) 7.6 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.  Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-unknown-linux-gnu --target=aarch64-elf-linux"... WARNING: kernel relocated [87998116MB]: patching 135244 gdb minimal_symbol values crash: CONFIG_NR_CPUS: 256 crash: CONFIG_HZ: 250 crash: # CONFIG_DEBUG_INFO_REDUCED is not set cpu_possible_mask: cpus: 0 1 2 3 cpu_present_mask: cpus: 0 1 2 3   cpu_online_mask: cpus: 0 1 2 3   cpu_active_mask: cpus: 0 1 2 3 xtime timespec.tv_sec: 5a6df368: Sun Jan 28 21:29:36 2018 utsname:      sysname: Linux     nodename: localhost      release: 5.5.0-rc4-00068-gf8631e1      version: #18 SMP PREEMPT Fri Jan 3 19:16:28 IST 2020      machine: aarch64   domainname: (none) base kernel version: 5.5.0 verify_namelist: dumpfile /proc/version: Linux version 5.5.0-rc4-00068-gf8631e1 (mailto:nxa19049@lsv03080.swis.in-blr01.nxp.com) (gcc version 7.3.0 (GCC)) #18 SMP PREEMPT Fri Jan 3 19:16:28 IST 2020 ../linux/vmlinux: Linux version 5.5.0-rc4-00068-gf8631e1 (mailto:nxa19049@lsv03080.swis.in-blr01.nxp.com) (gcc version 7.3.0 (GCC)) #18 SMP PREEMPT Fri Jan 3 19:16:28 IST 2020 crash: get_cpus_present: present: 4 hypervisor: (undetermined) ikconfig: 2550 valid configs. SECTION_SIZE_BITS: 30 CONFIG_ARM64_VA_BITS: 48       VA_BITS_ACTUAL: 48 (calculated) VA_BITS: 48 PAGE_OFFSET: ffff000000000000     VA_START: ffff800000000000      modules: ffff800008000000 - ffff80000fffffff      vmalloc: ffff800010000000 - fffffdffbffeffff kernel image: ffffd3ebfa480000 - ffffd3ebfbdbc000      vmemmap: fffffe0000000000 - ffffffffffffffff irq_stack_ptr:   type: 1, TYPE_CODE_PTR   target_typecode: 8, TYPE_CODE_INT   target_length: 8   length: 8 crash: test msg 2crash: test msg 2 p=7b5b9050 cpunum=0crash: read error: kernel virtual address: ffff00007b5b9050  type: "IRQ stack pointer" crash: test msg 2 p=7b5cf050 cpunum=1crash: read error: kernel virtual address: ffff00007b5cf050  type: "IRQ stack pointer" crash: test msg 2 p=7b5e5050 cpunum=2crash: read error: kernel virtual address: ffff00007b5e5050  type: "IRQ stack pointer" crash: test msg 2 p=7b5fb050 cpunum=3crash: read error: kernel virtual address: ffff00007b5fb050  type: "IRQ stack pointer" crash: builtin stackframe.sp offset differs from kernel version crash: builtin stackframe.pc offset differs from kernel version kernel NR_CPUS: 256 PAGESIZE=4096 mem_section_size = 8192 NR_SECTION_ROOTS = 1024 NR_MEM_SECTIONS = 262144 SECTIONS_PER_ROOT = 256 SECTION_ROOT_MASK = 0xff PAGES_PER_SECTION = 262144 crash: read error: kernel virtual address: ffff00007b616100  type: "memory section root table" Regards Poonam