Hi xiangyu,
On Fri, Dec 6, 2024 at 9:25 PM <xiangyu.chen@xxxxxxx> wrote:
>
> 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
>
1) Try to drop the "-S" of crash cmdline to see if it works.
2) If not, then please try to disable the kernel kaslr at bootup by
appending "nokaslr" to kernel cmdline, and invoke crash as your
original way.
Hope this helps.
Thanks,
Tao Liu
> 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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