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Linux kernel crash utility
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it cannot determine VA_BITS_ACTUAL on Linux 5.4 for ARM64 #52

Open figozhang opened 4 years ago

figozhang commented 4 years ago

i am using Linux 5.4 kernel, and found that there is a issue on crash.

root@ubuntu:~# crash /mnt/dump.202003310331 /usr/src/linux/vmlinux

crash 7.2.8 Copyright (C) 2002-2020 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.

crash: cannot determine VA_BITS_ACTUAL

root@ubuntu:~#

i enable the debug message: root@ubuntu:~# crash /mnt/dump.202003310331 -d 12 /usr/src/linux/vmlinux

crash 7.2.8 Copyright (C) 2002-2020 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.

compressed kdump: header->utsname.machine: aarch64 compressed kdump: memory bitmap offset: 2000 diskdump_data: filename: /mnt/dump.202003310331 flags: 6 (KDUMP_CMPRS_LOCAL|ERROR_EXCLUDED) dfd: 3 ofp: 0 machine_type: 183 (EM_AARCH64)

        header: aaaafcd11150
       signature: "KDUMP   "
  header_version: 6
         utsname:
           sysname: Linux
          nodename: ubuntu
           release: 5.4.0+
           version: #14 SMP Sun Mar 29 02:05:34 PDT 2020
           machine: aarch64
        domainname: (none)
       timestamp:
            tv_sec: 5e82b92c
           tv_usec: 0
          status: 1 (DUMP_DH_COMPRESSED_ZLIB)
      block_size: 4096
    sub_hdr_size: 1
   bitmap_blocks: 28
       max_mapnr: 458752
total_ram_blocks: 0
   device_blocks: 0
  written_blocks: 0
     current_cpu: 0
         nr_cpus: 4
  tasks[nr_cpus]: 0
                  0
                  0
                  0

    sub_header: 0 (n/a)

sub_header_kdump: aaaafcd12160 phys_base: 40000000 dump_level: 31 (0x1f) (DUMP_EXCLUDE_ZERO|DUMP_EXCLUDE_CACHE|DUMP_EXCLUDE_CACHE_PRI|DUMP_EXCLUDE_USER_DATA|DUMP_EXCLUDE_FREE) split: 0 start_pfn: (unused) end_pfn: (unused) offset_vmcoreinfo: 5872 (0x16f0) size_vmcoreinfo: 1875 (0x753) OSRELEASE=5.4.0+ PAGESIZE=4096 SYMBOL(init_uts_ns)=ffff8000116a3368 SYMBOL(node_online_map)=ffff80001169ac78 SYMBOL(swapper_pg_dir)=ffff80001156f000 SYMBOL(_stext)=ffff800010081000 SYMBOL(vmap_area_list)=ffff8000116e1300 SYMBOL(mem_section)=ffff00002bdf1f00 LENGTH(mem_section)=2048 SIZE(mem_section)=32 OFFSET(mem_section.section_mem_map)=0 SIZE(page)=64 SIZE(pglist_data)=4352 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)=3616 OFFSET(pglist_data.node_start_pfn)=3624 OFFSET(pglist_data.node_spanned_pages)=3640 OFFSET(pglist_data.node_id)=3648 OFFSET(zone.free_area)=192 OFFSET(zone.vm_stat)=1472 OFFSET(zone.spanned_pages)=96 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)=ffff8000116bb240 SYMBOL(log_buf_len)=ffff8000116bb248 SYMBOL(log_first_idx)=ffff800011794408 SYMBOL(clear_idx)=ffff800011794440 SYMBOL(log_next_idx)=ffff800011794418 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)=0xffff7fffd0000000 NUMBER(PHYS_OFFSET)=0x40000000 KERNELOFFSET=0 CRASHTIME=1585625388 offset_note: 4200 (0x1068) size_note: 3548 (0xddc) notes_buf: aaaafcd4b190 num_vmcoredd_notes: 0 num_prstatus_notes: 4 notes[0]: aaaafcd4b190 (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: 4c8d7d360216aa00 X2: 4c8d7d360216aa00 X3: ffff00002bd7e6a0 X4: 0000000000000000 X5: 0000000000000000 X6: 0000000000000000 X7: 0000000000000000 X8: ffff8000116a4bc0 X9: ffff800011693de0 X10: 00000000000009e0 X11: 0000000000000000 X12: 0000000000000000 X13: 0000000000000000 X14: 0000000000000000 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: ffff800011607000 X20: 0000000000000000 X21: 0000000048000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000041570018 X29: ffff800011693e50 LR: ffff80001008f5d0 SP: ffff800011693e50 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[1]: aaaafcd4b32c (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: 1784968832808700 X2: 1784968832808700 X3: ffff00002bda06a0 X4: 0000000000000000 X5: ffff800010262cac X6: 0000000000000000 X7: 0000000000000000 X8: ffff00002a5a5040 X9: ffff00002a5b7e40 X10: 00000000000009e0 X11: 0000000000000000 X12: 00001e8480000000 X13: 003d088b9f27daac X14: 000000005b8048cf X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: 0000000000000000 X21: 0000000000000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000000000000 X29: ffff00002a5b7eb0 LR: ffff80001008f5d0 SP: ffff00002a5b7eb0 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[2]: aaaafcd4b4c8 (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: 6092186060fd2600 X2: 6092186060fd2600 X3: ffff00002bdc26a0 X4: 0000000000000000 X5: ffff800010262cac X6: 0000000000000000 X7: 0000000000000000 X8: ffff00002a5a6c40 X9: ffff00002a5bbe40 X10: 00000000000009e0 X11: 0000000000000000 X12: 0000000000000000 X13: 0000000000000000 X14: 0000000000000000 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: 0000000000000000 X21: 0000000000000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000000000000 X29: ffff00002a5bbeb0 LR: ffff80001008f5d0 SP: ffff00002a5bbeb0 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[3]: aaaafcd4b664 (NT_PRSTATUS) si.signo: 0 si.code: 0 si.errno: 0 cursig: 0 sigpend: 0 sighold: 0 pid: 611 ppid: 0 pgrp: 0 sid:0 utime: 0.000000 stime: 0.000000 cutime: 0.000000 cstime: 0.000000 X0: 0000000000000000 X1: 0000000000000000 X2: ffff0000218b7938 X3: 0000000000000000 X4: ffff8000116c62b8 X5: 0000000000000000 X6: ffff00002a435f00 X7: 0720072007200720 X8: 0720072007200720 X9: 0720072007200720 X10: 0720072007200720 X11: 0720072007200720 X12: 0720072007200720 X13: 0720072007200720 X14: 0720072007200720 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: ffff80001a761000 X21: 00000000ffffffff X22: 0000ffffb51997e0 X23: 0000000020001000 X24: 0000000000000015 X25: 0000000056000000 X26: 0000000000000000 X27: 0000000000000000 X28: ffff000021934600 X29: ffff0000218b78e0 LR: ffff8000102b3b44 SP: ffff0000218b78e0 PC: ffff8000102b1af0 PSTATE: 60000085 FPVALID: 00000000 snapshot_task: 0 num_qemu_notes: 0 NOTE offsets: 1068 (NT_PRSTATUS) 1204 (NT_PRSTATUS) 13a0 (NT_PRSTATUS) 153c (NT_PRSTATUS) offset_eraseinfo: 0 (0x0) size_eraseinfo: 0 (0x0) start_pfn_64: (unused) end_pfn_64: (unused) max_mapnr_64: 458752 (0x70000)

   data_offset: 1e000
    block_size: 4096
   block_shift: 12
        bitmap: aaaafcd13170
    bitmap_len: 114688
     max_mapnr: 458752 (0x70000)

dumpable_bitmap: aaaafcd2f180 byte: 0 bit: 0 compressed_page: aaaafcd74560 curbufptr: 0

page_cache_hdr[0]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd64550 pg_hit_count: 0 page_cache_hdr[1]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd65550 pg_hit_count: 0 page_cache_hdr[2]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd66550 pg_hit_count: 0 page_cache_hdr[3]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd67550 pg_hit_count: 0 page_cache_hdr[4]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd68550 pg_hit_count: 0 page_cache_hdr[5]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd69550 pg_hit_count: 0 page_cache_hdr[6]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6a550 pg_hit_count: 0 page_cache_hdr[7]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6b550 pg_hit_count: 0 page_cache_hdr[8]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6c550 pg_hit_count: 0 page_cache_hdr[9]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6d550 pg_hit_count: 0 page_cache_hdr[10]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6e550 pg_hit_count: 0 page_cache_hdr[11]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6f550 pg_hit_count: 0 page_cache_hdr[12]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd70550 pg_hit_count: 0 page_cache_hdr[13]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd71550 pg_hit_count: 0 page_cache_hdr[14]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd72550 pg_hit_count: 0 page_cache_hdr[15]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd73550 pg_hit_count: 0

page_cache_buf: aaaafcd64550
   evict_index: 0
     evictions: 0
      accesses: 0
  cached_reads: 0 
   valid_pages: aaaafcd641c0

readmem: read_diskdump() crash: pv_ops exists: ARCH_PVOPS

crash: cannot determine VA_BITS_ACTUAL

root@ubuntu:~#

crash-utility commented 4 years ago

----- Original Message -----

i am using Linux 5.4 kernel, and found that there is a issue on crash.

This is a known issue.

We are still waiting for the upstream ARM64 kernel maintainers to accept Bhupesh Sharma's "NUMBER(tcr_el1_t1sz)" vmcoreinfo patch, which is required to determine the vabits_actual value from a dumpfile. I believe v5 was the last attempt:

[PATCH v5 2/5] arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo https://lkml.org/lkml/2019/11/28/659

I'm not sure what the current status is.

Note this code in the crash utility's arm64.c, which was put in place in advance of its actual existence in the upstream kernel:

                    if ((string = pc->read_vmcoreinfo("NUMBER(tcr_el1_t1sz)"))) {
                            /* See ARMv8 ARM for the description of
                             * TCR_EL1.T1SZ and how it can be used
                             * to calculate the vabits_actual
                             * supported by underlying kernel.
                             *
                             * Basically:
                             * vabits_actual = 64 - T1SZ;
                             */
                            value = 64 - strtoll(string, NULL, 0);
                            if (CRASHDEBUG(1))
                                    fprintf(fp,  "vmcoreinfo : vabits_actual: %ld\n", value);
                            free(string);
                            machdep->machspec->VA_BITS_ACTUAL = value;
                            machdep->machspec->VA_BITS = value;
                            machdep->machspec->VA_START = _VA_START(machdep->machspec->VA_BITS_ACTUAL);
                    } else
                            error(FATAL, "cannot determine VA_BITS_ACTUAL\n");

Dave

root@ubuntu:~# crash /mnt/dump.202003310331 /usr/src/linux/vmlinux

crash 7.2.8 Copyright (C) 2002-2020 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.

crash: cannot determine VA_BITS_ACTUAL

root@ubuntu:~#

i enable the debug message: root@ubuntu:~# crash /mnt/dump.202003310331 -d 12 /usr/src/linux/vmlinux

crash 7.2.8 Copyright (C) 2002-2020 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.

compressed kdump: header->utsname.machine: aarch64 compressed kdump: memory bitmap offset: 2000 diskdump_data: filename: /mnt/dump.202003310331 flags: 6 (KDUMP_CMPRS_LOCAL|ERROR_EXCLUDED) dfd: 3 ofp: 0 machine_type: 183 (EM_AARCH64)

        header: aaaafcd11150
       signature: "KDUMP   "
  header_version: 6
         utsname:
           sysname: Linux
          nodename: ubuntu
           release: 5.4.0+
           version: #14 SMP Sun Mar 29 02:05:34 PDT 2020
           machine: aarch64
        domainname: (none)
       timestamp:
            tv_sec: 5e82b92c
           tv_usec: 0
          status: 1 (DUMP_DH_COMPRESSED_ZLIB)
      block_size: 4096
    sub_hdr_size: 1
   bitmap_blocks: 28
       max_mapnr: 458752
total_ram_blocks: 0
   device_blocks: 0
  written_blocks: 0
     current_cpu: 0
         nr_cpus: 4
  tasks[nr_cpus]: 0
                  0
                  0
                  0

    sub_header: 0 (n/a)

sub_header_kdump: aaaafcd12160 phys_base: 40000000 dump_level: 31 (0x1f) (DUMP_EXCLUDE_ZERO|DUMP_EXCLUDE_CACHE|DUMP_EXCLUDE_CACHE_PRI|DUMP_EXCLUDE_USER_DATA|DUMP_EXCLUDE_FREE) split: 0 start_pfn: (unused) end_pfn: (unused) offset_vmcoreinfo: 5872 (0x16f0) size_vmcoreinfo: 1875 (0x753) OSRELEASE=5.4.0+ PAGESIZE=4096 SYMBOL(init_uts_ns)=ffff8000116a3368 SYMBOL(node_online_map)=ffff80001169ac78 SYMBOL(swapper_pg_dir)=ffff80001156f000 SYMBOL(_stext)=ffff800010081000 SYMBOL(vmap_area_list)=ffff8000116e1300 SYMBOL(mem_section)=ffff00002bdf1f00 LENGTH(mem_section)=2048 SIZE(mem_section)=32 OFFSET(mem_section.section_mem_map)=0 SIZE(page)=64 SIZE(pglist_data)=4352 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)=3616 OFFSET(pglist_data.node_start_pfn)=3624 OFFSET(pglist_data.node_spanned_pages)=3640 OFFSET(pglist_data.node_id)=3648 OFFSET(zone.free_area)=192 OFFSET(zone.vm_stat)=1472 OFFSET(zone.spanned_pages)=96 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)=ffff8000116bb240 SYMBOL(log_buf_len)=ffff8000116bb248 SYMBOL(log_first_idx)=ffff800011794408 SYMBOL(clear_idx)=ffff800011794440 SYMBOL(log_next_idx)=ffff800011794418 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)=0xffff7fffd0000000 NUMBER(PHYS_OFFSET)=0x40000000 KERNELOFFSET=0 CRASHTIME=1585625388 offset_note: 4200 (0x1068) size_note: 3548 (0xddc) notes_buf: aaaafcd4b190 num_vmcoredd_notes: 0 num_prstatus_notes: 4 notes[0]: aaaafcd4b190 (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: 4c8d7d360216aa00 X2: 4c8d7d360216aa00 X3: ffff00002bd7e6a0 X4: 0000000000000000 X5: 0000000000000000 X6: 0000000000000000 X7: 0000000000000000 X8: ffff8000116a4bc0 X9: ffff800011693de0 X10: 00000000000009e0 X11: 0000000000000000 X12: 0000000000000000 X13: 0000000000000000 X14: 0000000000000000 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: ffff800011607000 X20: 0000000000000000 X21: 0000000048000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000041570018 X29: ffff800011693e50 LR: ffff80001008f5d0 SP: ffff800011693e50 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[1]: aaaafcd4b32c (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: 1784968832808700 X2: 1784968832808700 X3: ffff00002bda06a0 X4: 0000000000000000 X5: ffff800010262cac X6: 0000000000000000 X7: 0000000000000000 X8: ffff00002a5a5040 X9: ffff00002a5b7e40 X10: 00000000000009e0 X11: 0000000000000000 X12: 00001e8480000000 X13: 003d088b9f27daac X14: 000000005b8048cf X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: 0000000000000000 X21: 0000000000000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000000000000 X29: ffff00002a5b7eb0 LR: ffff80001008f5d0 SP: ffff00002a5b7eb0 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[2]: aaaafcd4b4c8 (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: 6092186060fd2600 X2: 6092186060fd2600 X3: ffff00002bdc26a0 X4: 0000000000000000 X5: ffff800010262cac X6: 0000000000000000 X7: 0000000000000000 X8: ffff00002a5a6c40 X9: ffff00002a5bbe40 X10: 00000000000009e0 X11: 0000000000000000 X12: 0000000000000000 X13: 0000000000000000 X14: 0000000000000000 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: 0000000000000000 X21: 0000000000000000 X22: 0000000000000000 X23: 0000000000000000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: 0000000000000000 X29: ffff00002a5bbeb0 LR: ffff80001008f5d0 SP: ffff00002a5bbeb0 PC: ffff80001008f644 PSTATE: 60000005 FPVALID: 00000000 notes[3]: aaaafcd4b664 (NT_PRSTATUS) si.signo: 0 si.code: 0 si.errno: 0 cursig: 0 sigpend: 0 sighold: 0 pid: 611 ppid: 0 pgrp: 0 sid:0 utime: 0.000000 stime: 0.000000 cutime: 0.000000 cstime: 0.000000 X0: 0000000000000000 X1: 0000000000000000 X2: ffff0000218b7938 X3: 0000000000000000 X4: ffff8000116c62b8 X5: 0000000000000000 X6: ffff00002a435f00 X7: 0720072007200720 X8: 0720072007200720 X9: 0720072007200720 X10: 0720072007200720 X11: 0720072007200720 X12: 0720072007200720 X13: 0720072007200720 X14: 0720072007200720 X15: 0000000000000000 X16: 0000000000000000 X17: 0000000000000000 X18: 0000000000000000 X19: 0000000000000000 X20: ffff80001a761000 X21: 00000000ffffffff X22: 0000ffffb51997e0 X23: 0000000020001000 X24: 0000000000000015 X25: 0000000056000000 X26: 0000000000000000 X27: 0000000000000000 X28: ffff000021934600 X29: ffff0000218b78e0 LR: ffff8000102b3b44 SP: ffff0000218b78e0 PC: ffff8000102b1af0 PSTATE: 60000085 FPVALID: 00000000 snapshot_task: 0 num_qemu_notes: 0 NOTE offsets: 1068 (NT_PRSTATUS) 1204 (NT_PRSTATUS) 13a0 (NT_PRSTATUS) 153c (NT_PRSTATUS) offset_eraseinfo: 0 (0x0) size_eraseinfo: 0 (0x0) start_pfn_64: (unused) end_pfn_64: (unused) max_mapnr_64: 458752 (0x70000)

   data_offset: 1e000
    block_size: 4096
   block_shift: 12
        bitmap: aaaafcd13170
    bitmap_len: 114688
     max_mapnr: 458752 (0x70000)

dumpable_bitmap: aaaafcd2f180 byte: 0 bit: 0 compressed_page: aaaafcd74560 curbufptr: 0

page_cache_hdr[0]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd64550 pg_hit_count: 0 page_cache_hdr[1]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd65550 pg_hit_count: 0 page_cache_hdr[2]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd66550 pg_hit_count: 0 page_cache_hdr[3]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd67550 pg_hit_count: 0 page_cache_hdr[4]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd68550 pg_hit_count: 0 page_cache_hdr[5]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd69550 pg_hit_count: 0 page_cache_hdr[6]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6a550 pg_hit_count: 0 page_cache_hdr[7]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6b550 pg_hit_count: 0 page_cache_hdr[8]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6c550 pg_hit_count: 0 page_cache_hdr[9]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6d550 pg_hit_count: 0 page_cache_hdr[10]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6e550 pg_hit_count: 0 page_cache_hdr[11]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd6f550 pg_hit_count: 0 page_cache_hdr[12]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd70550 pg_hit_count: 0 page_cache_hdr[13]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd71550 pg_hit_count: 0 page_cache_hdr[14]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd72550 pg_hit_count: 0 page_cache_hdr[15]: pg_flags: 0 () pg_addr: 0 pg_bufptr: aaaafcd73550 pg_hit_count: 0

page_cache_buf: aaaafcd64550
   evict_index: 0
     evictions: 0
      accesses: 0
  cached_reads: 0
   valid_pages: aaaafcd641c0

readmem: read_diskdump() crash: pv_ops exists: ARCH_PVOPS

crash: cannot determine VA_BITS_ACTUAL

root@ubuntu:~#

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figozhang commented 4 years ago

i check the v5.4.28, i seems not include this patch:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/kernel/crash_core.c?h=linux-5.4.y

figozhang commented 4 years ago

my question is the crash code should check the kernel version before you add "TCR_EL1.T1SZ"?

crash-utility commented 4 years ago

----- Original Message -----

my question is the crash code should check the kernel version before you add "TCR_EL1.T1SZ"?

Well, it's essentially doing that by checking for the existence of "vabits_actual".

Unfortunately the upstream arm64 kernel maintainers have been a huge pain in the ass in their acceptance of a simply vmcoreinfo entry.

Checking kernel version has become extremely unreliable since the advent of the upstream stable/longterm releases, not to mention backports done by the various distributions.

crash-utility commented 4 years ago

----- Original Message -----

i check the v5.4.27, i seems not include this patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/kernel/crash_core.c?h=v5.4.27

That's unfortunate.

crash-utility commented 4 years ago

I don't know if this will help your cause, but I just checked this patch in:

https://github.com/crash-utility/crash/commit/d379b47f04dc77ea1989609aca9bfd8d37b7b639

Introduce a new ARM64 "--machdep vabits_actual=" command line option for Linux 5.4 and later dumpfiles, which require the kernel's dynamically-determined "vabits_actual" value for virtual address translation. Without the patch, the crash session fails during initialization with the error message "crash: cannot determine VA_BITS_ACTUAL". This option will become unnecessary when the proposed TCR_EL1.T1SZ vmcoreinfo entry entry is incorporated into the kernel. (anderson@redhat.com)

Here's an attempt on a compressed kdump dumpfile from a 5.6.0-rc7 based kernel:

$ ./crash vmlinux vmcore

crash 7.2.8++ Copyright (C) 2002-2020 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.

crash: cannot determine VA_BITS_ACTUAL

$

And then here with the new option:

$ ./crash vmlinux vmcore --machdep vabits_actual=48

crash 7.2.8++ Copyright (C) 2002-2020 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.

NOTE: setting vabits_actual to: 48

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 "aarch64-unknown-linux-gnu"...

    KERNEL: vmlinux                           
  DUMPFILE: vmcore
      CPUS: 8 [OFFLINE: 1]
      DATE: Thu Apr  2 08:22:17 2020
    UPTIME: 00:00:58

LOAD AVERAGE: 1.45, 0.51, 0.18 TASKS: 222 NODENAME: apm-mustang-ev3-07.khw2.lab.eng.bos.redhat.com RELEASE: 5.6.0-0.rc7.1.elrdy.aarch64 VERSION: #1 SMP Mon Mar 30 18:59:14 UTC 2020 MACHINE: aarch64 (unknown Mhz) MEMORY: 16 GB PANIC: "Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038" PID: 1622 COMMAND: "bash" TASK: ffff0003c0f9ed00 [THREAD_INFO: ffff0003c0f9ed00] CPU: 1 STATE: TASK_RUNNING (PANIC)

crash>

figozhang commented 4 years ago

great! it woks for me, thanks!