Hi Crash-utility folks,
Recently, I am using crash to debug a live system.
When I execute the crash, it cannot enter the crash cmd shell, it was broken by crash seek error.
My kernel turned on the CONFIG_RANDOMIZE_BASE, and I added the kaslr=auto parameter to crash.
If I disable the CONFIG_RANDOMIZE_BASE, the issue has gone.
Could you please help to check if any config/parameter I was missing? Thanks.
The following is my system information:
crash version: 8.0.6
kernel version: 6.1.118
Host system: qemux86-64
Here is the full log with -d:
root@intel-x86-64:/boot# crash -S /boot/vmlinux-6.1.118-yocto-standard /proc/kcore -d10 --kaslr=auto
crash 8.0.6
Copyright (C) 2002-2025 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, 2020-2024 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
Copyright (C) 2015, 2021 VMware, 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.
get_live_memory_source: /proc/kcore
proc_kcore_data:
flags: 500 (KCORE_LOCAL|KCORE_ELF64)
segments: 10
elf_header: 56471f1eb9c0
header_size: 12324
notes64: 56471f1eba00
load64: 56471f1eba38
notes32: 0
load32: 0
vmcoreinfo: 0
size_vmcoreinfo: 0
Elf64_Phdr:
p_type: 4 (PT_NOTE)
p_flags: 0
p_offset: 2a8
p_vaddr: 0
p_paddr: 0
p_filesz: 11644
p_memsz: 0
p_align: 0
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 7fffaa404000
p_vaddr: ffffffffaa400000
p_paddr: b8600000
p_filesz: 33751040
p_memsz: 33751040
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 286600004000
p_vaddr: ffffa86600000000
p_paddr: ffffffffffffffff
p_filesz: 35184372088831
p_memsz: 35184372088831
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 7fffc0004000
p_vaddr: ffffffffc0000000
p_paddr: ffffffffffffffff
p_filesz: 1056964608
p_memsz: 1056964608
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 126ac0005000
p_vaddr: ffff926ac0001000
p_paddr: 1000
p_filesz: 647168
p_memsz: 647168
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 4d8880004000
p_vaddr: ffffcd8880000000
p_paddr: ffffffffffffffff
p_filesz: 12288
p_memsz: 12288
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 126ac0104000
p_vaddr: ffff926ac0100000
p_paddr: 100000
p_filesz: 12902400
p_memsz: 12902400
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 4d8880008000
p_vaddr: ffffcd8880004000
p_paddr: ffffffffffffffff
p_filesz: 204800
p_memsz: 204800
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 126ac0d53000
p_vaddr: ffff926ac0d4f000
p_paddr: d4f000
p_filesz: 3207118848
p_memsz: 3207118848
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 126bc0004000
p_vaddr: ffff926bc0000000
p_paddr: 100000000
p_filesz: 4294967296
p_memsz: 4294967296
p_align: 4096
Elf64_Phdr:
p_type: 1 (PT_LOAD)
p_flags: 7
p_offset: 4d8884004000
p_vaddr: ffffcd8884000000
p_paddr: ffffffffffffffff
p_filesz: 67108864
p_memsz: 67108864
p_align: 4096
Elf64_Nhdr:
n_namesz: 5 ("CORE")
n_descsz: 336
n_type: 1 (NT_PRSTATUS)
Elf64_Nhdr:
n_namesz: 5 ("CORE")
n_descsz: 136
n_type: 3 (NT_PRPSINFO)
Elf64_Nhdr:
n_namesz: 5 ("CORE")
n_descsz: 7808
n_type: 4 (NT_TASKSTRUCT)
Elf64_Nhdr:
n_namesz: 11 ("VMCOREINFO")
n_descsz: 3279
n_type: 0 (unknown)
OSRELEASE=6.1.118-yocto-standard
BUILD-ID=1400000003000000474e5500a343709706409b9c
PAGESIZE=4096
SYMBOL(init_uts_ns)=ffffffffac037a80
OFFSET(uts_namespace.name)=0
SYMBOL(node_online_map)=ffffffffac06d3e8
SYMBOL(swapper_pg_dir)=ffffffffabe0a000
SYMBOL(_stext)=ffffffffaa400000
SYMBOL(vmap_area_list)=ffffffffabf12fb0
SYMBOL(mem_section)=ffff926cbfff5000
LENGTH(mem_section)=2048
SIZE(mem_section)=16
OFFSET(mem_section.section_mem_map)=0
NUMBER(SECTION_SIZE_BITS)=27
NUMBER(MAX_PHYSMEM_BITS)=46
SIZE(page)=64
SIZE(pglist_data)=15616
SIZE(zone)=1600
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)=14624
OFFSET(pglist_data.node_start_pfn)=14632
OFFSET(pglist_data.node_spanned_pages)=14648
OFFSET(pglist_data.node_id)=14656
OFFSET(zone.free_area)=192
OFFSET(zone.vm_stat)=1472
OFFSET(zone.spanned_pages)=136
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(prb)=ffffffffabe647d8
SYMBOL(printk_rb_static)=ffffffffabe647e0
SYMBOL(clear_seq)=ffffffffac307f20
SIZE(printk_ringbuffer)=88
OFFSET(printk_ringbuffer.desc_ring)=0
OFFSET(printk_ringbuffer.text_data_ring)=48
OFFSET(printk_ringbuffer.fail)=80
SIZE(prb_desc_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
SIZE(prb_desc)=24
OFFSET(prb_desc.state_var)=0
OFFSET(prb_desc.text_blk_lpos)=8
SIZE(prb_data_blk_lpos)=16
OFFSET(prb_data_blk_lpos.begin)=0
OFFSET(prb_data_blk_lpos.next)=8
SIZE(printk_info)=88
OFFSET(printk_info.seq)=0
OFFSET(printk_info.ts_nsec)=8
OFFSET(printk_info.text_len)=16
OFFSET(printk_info.caller_id)=20
OFFSET(printk_info.dev_info)=24
SIZE(dev_printk_info)=64
OFFSET(dev_printk_info.subsystem)=0
LENGTH(printk_info_subsystem)=16
OFFSET(dev_printk_info.device)=16
LENGTH(printk_info_device)=48
SIZE(prb_data_ring)=32
OFFSET(prb_data_ring.size_bits)=0
OFFSET(prb_data_ring.data)=8
OFFSET(prb_data_ring.head_lpos)=16
OFFSET(prb_data_ring.tail_lpos)=24
SIZE(atomic_long_t)=8
OFFSET(atomic_long_t.counter)=0
SIZE(latched_seq)=24
OFFSET(latched_seq.val)=8
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)=23
NUMBER(PG_head_mask)=65536
NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE)=-129
NUMBER(HUGETLB_PAGE_DTOR)=2
NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE)=-257
SYMBOL(kallsyms_names)=ffffffffaba0f7d8
SYMBOL(kallsyms_num_syms)=ffffffffaba0f7d0
SYMBOL(kallsyms_token_table)=ffffffffabbf5400
SYMBOL(kallsyms_token_index)=ffffffffabbf5788
SYMBOL(kallsyms_offsets)=ffffffffab9984f8
SYMBOL(kallsyms_relative_base)=ffffffffaba0f7c8
NUMBER(phys_base)=2384461824
SYMBOL(init_top_pgt)=ffffffffabe0a000
NUMBER(pgtable_l5_enabled)=0
SYMBOL(node_data)=ffffffffac06c3a0
LENGTH(node_data)=64
KERNELOFFSET=29400000
NUMBER(KERNEL_IMAGE_SIZE)=1073741824
NUMBER(sme_mask)=0
readmem: read_proc_kcore() -> /proc/kcore
VMCOREINFO: NUMBER(phys_base): 2384461824 -> 8e200000
gdb /boot/vmlinux-6.1.118-yocto-standard
GNU gdb (GDB) 10.2
Copyright (C) 2021 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 "x86_64-wrs-linux".
Type "show configuration" for configuration details.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
GETBUF(344 -> 0)
GETBUF(1500 -> 1)
FREEBUF(1)
FREEBUF(0)
<readmem: ffffffff8292c360, KVADDR, "page_offset_base", 8, (FOE|Q), 56471ef799c8>
<read_proc_kcore: addr: ffffffff8292c360 paddr: 90b2c360 cnt: 8>
crash: seek error: kernel virtual address: ffffffff8292c360 type: "page_offset_base"
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