Hi Baoquan,
At 02/07/2018 08:45 PM, Baoquan He wrote:
On 02/07/18 at 08:34pm, Dou Liyang wrote:
At 02/07/2018 08:27 PM, Baoquan He wrote:
On 02/07/18 at 08:17pm, Dou Liyang wrote:
Hi Baoquan,
At 02/07/2018 08:08 PM, Baoquan He wrote:
On 02/07/18 at 08:00pm, Dou Liyang wrote:
Hi Kirill,Mike
At 02/07/2018 06:45 PM, Mike Galbraith wrote: > On Wed, 2018-02-07 at 13:41 +0300, Kirill A. Shutemov wrote: >> On Wed, Feb 07, 2018 at 05:25:05PM +0800, Dou Liyang wrote: >>> Hi All, >>> >>> I met the makedumpfile failed in the upstream kernel which contained >>> this patch. Did I missed something else? >> >> None I'm aware of. >> >> Is there a reason to suspect that the issue is related to the bug this patch >> fixed? >
I did a contrastive test by my colleagues Indoh's suggestion.
OK, I may get the reason. kaslr is enabled, right? You can try to
I add 'nokaslr' to disable the KASLR feature.
# cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.15.0+ root=UUID=10f10326-c923-4098-86aa-afed5c54ee0b ro crashkernel=512M rhgb console=tty0 console=ttyS0 nokaslr LANG=en_US.UTF-8
disable kaslr and try them again. Because phys_base and kaslr_offset are got from vmlinux, while these are generated at compiling time. Just a guess.
Oh, I will recompile the kernel with KASLR disabled in .config.
Thanks, dou.
Revert your two commits:
commit 83e3c48729d9ebb7af5a31a504f3fd6aff0348c4 Author: Kirill A. Shutemov kirill.shutemov@linux.intel.com Date: Fri Sep 29 17:08:16 2017 +0300
commit 629a359bdb0e0652a8227b4ff3125431995fec6e Author: Kirill A. Shutemov kirill.shutemov@linux.intel.com Date: Tue Nov 7 11:33:37 2017 +0300
...and keep others unchanged, the makedumpfile works well.
> Still works fine for me with .today. Box is only 16GB desktop box though. > Btw, In the upstream kernel which contained this patch, I did two tests:
1) use the makedumpfile as core_collector in /etc/kdump.conf, thentrigger the process of kdump by echo 1 >/proc/sysrq-trigger, the makedumpfile works well and I can get the vmcore file.
......It is OK 2) use cp as core_collector, do the same operation to get the vmcore file.then use makedumpfile to do like above:
[douly@localhost code]$ ./makedumpfile -d 31 --message-level 31 -xvmlinux_4.15+ vmcore_4.15+_from_cp_command vmcore_4.15+
Oh, then please ignore my previous comment. Adding '-D' can give more debugging message.
I added '-D', Just like before, no more debugging message:
BTW, I use crash to analyze the vmcore file created by 'cp' command.
./crash ../makedumpfile/code/vmcore_4.15+_from_cp_command../makedumpfile/code/vmlinux_4.15+
the crash works well, It's so interesting.
Thanks, dou.
The debugging message with '-D':
And what's the debugging printing when trigger crash by sysrq?
kdump: dump target is /dev/vda2 kdump: saving to /sysroot//var/crash/127.0.0.1-2018-02-07-07:31:56/ [ 2.751352] EXT4-fs (vda2): re-mounted. Opts: data=ordered kdump: saving vmcore-dmesg.txt kdump: saving vmcore-dmesg.txt complete kdump: saving vmcore sadump: does not have partition header sadump: read dump device as unknown format sadump: unknown format LOAD (0) phys_start : 1000000 phys_end : 2a86000 virt_start : ffffffff81000000 virt_end : ffffffff82a86000 LOAD (1) phys_start : 1000 phys_end : 9fc00 virt_start : ffff880000001000 virt_end : ffff88000009fc00 LOAD (2) phys_start : 100000 phys_end : 13000000 virt_start : ffff880000100000 virt_end : ffff880013000000 LOAD (3) phys_start : 33000000 phys_end : 7ffd7000 virt_start : ffff880033000000 virt_end : ffff88007ffd7000 Linux kdump page_size : 4096
max_mapnr : 7ffd7
Buffer size for the cyclic mode: 131061
num of NODEs : 1
Memory type : SPARSEMEM_EX
mem_map (0) mem_map : ffffea0000000000 pfn_start : 0 pfn_end : 8000 mem_map (1) mem_map : ffffea0000200000 pfn_start : 8000 pfn_end : 10000 mem_map (2) mem_map : ffffea0000400000 pfn_start : 10000 pfn_end : 18000 mem_map (3) mem_map : ffffea0000600000 pfn_start : 18000 pfn_end : 20000 mem_map (4) mem_map : ffffea0000800000 pfn_start : 20000 pfn_end : 28000 mem_map (5) mem_map : ffffea0000a00000 pfn_start : 28000 pfn_end : 30000 mem_map (6) mem_map : ffffea0000c00000 pfn_start : 30000 pfn_end : 38000 mem_map (7) mem_map : ffffea0000e00000 pfn_start : 38000 pfn_end : 40000 mem_map (8) mem_map : ffffea0001000000 pfn_start : 40000 pfn_end : 48000 mem_map (9) mem_map : ffffea0001200000 pfn_start : 48000 pfn_end : 50000 mem_map (10) mem_map : ffffea0001400000 pfn_start : 50000 pfn_end : 58000 mem_map (11) mem_map : ffffea0001600000 pfn_start : 58000 pfn_end : 60000 mem_map (12) mem_map : ffffea0001800000 pfn_start : 60000 pfn_end : 68000 mem_map (13) mem_map : ffffea0001a00000 pfn_start : 68000 pfn_end : 70000 mem_map (14) mem_map : ffffea0001c00000 pfn_start : 70000 pfn_end : 78000 mem_map (15) mem_map : ffffea0001e00000 pfn_start : 78000 pfn_end : 7ffd7 mmap() is available on the kernel. Copying data : [100.0 %] - eta: 0s Writing erase info... offset_eraseinfo: 9567fb0, size_eraseinfo: 0 kdump: saving vmcore complete
Thanks, dou
[douly@localhost code]$ ./makedumpfile -D -d 31 --message-level 31 -x vmlinux_4.15+ vmcore_4.15+_from_cp_command vmcore_4.15+ sadump: does not have partition header sadump: read dump device as unknown format sadump: unknown format LOAD (0) phys_start : 1000000 phys_end : 2a86000 virt_start : ffffffff81000000 virt_end : ffffffff82a86000 LOAD (1) phys_start : 1000 phys_end : 9fc00 virt_start : ffff880000001000 virt_end : ffff88000009fc00 LOAD (2) phys_start : 100000 phys_end : 13000000 virt_start : ffff880000100000 virt_end : ffff880013000000 LOAD (3) phys_start : 33000000 phys_end : 7ffd7000 virt_start : ffff880033000000 virt_end : ffff88007ffd7000 Linux kdump page_size : 4096
max_mapnr : 7ffd7
Buffer size for the cyclic mode: 131061 The kernel version is not supported. The makedumpfile operation may be incomplete.
num of NODEs : 1
Memory type : SPARSEMEM_EX
mem_map (0) mem_map : ffff88007ff26000 pfn_start : 0 pfn_end : 8000 mem_map (1) mem_map : 0 pfn_start : 8000 pfn_end : 10000 mem_map (2) mem_map : 0 pfn_start : 10000 pfn_end : 18000 mem_map (3) mem_map : 0 pfn_start : 18000 pfn_end : 20000 mem_map (4) mem_map : 0 pfn_start : 20000 pfn_end : 28000 mem_map (5) mem_map : 0 pfn_start : 28000 pfn_end : 30000 mem_map (6) mem_map : 0 pfn_start : 30000 pfn_end : 38000 mem_map (7) mem_map : 0 pfn_start : 38000 pfn_end : 40000 mem_map (8) mem_map : 0 pfn_start : 40000 pfn_end : 48000 mem_map (9) mem_map : 0 pfn_start : 48000 pfn_end : 50000 mem_map (10) mem_map : 0 pfn_start : 50000 pfn_end : 58000 mem_map (11) mem_map : 0 pfn_start : 58000 pfn_end : 60000 mem_map (12) mem_map : 0 pfn_start : 60000 pfn_end : 68000 mem_map (13) mem_map : 0 pfn_start : 68000 pfn_end : 70000 mem_map (14) mem_map : 0 pfn_start : 70000 pfn_end : 78000 mem_map (15) mem_map : 0 pfn_start : 78000 pfn_end : 7ffd7 mmap() is available on the kernel. Checking for memory holes : [100.0 %] | STEP [Checking for memory holes ] : 0.000014 seconds __vtop4_x86_64: Can't get a valid pte. readmem: Can't convert a virtual address(ffff88007ffd7000) to physical address. readmem: type_addr: 0, addr:ffff88007ffd7000, size:32768 __exclude_unnecessary_pages: Can't read the buffer of struct page. create_2nd_bitmap: Can't exclude unnecessary pages. Checking for memory holes : [100.0 %] \ STEP [Checking for memory holes ] : 0.000006 seconds Checking for memory holes : [100.0 %] - STEP [Checking for memory holes ] : 0.000004 seconds __vtop4_x86_64: Can't get a valid pte. readmem: Can't convert a virtual address(ffff88007ffd7000) to physical address. readmem: type_addr: 0, addr:ffff88007ffd7000, size:32768 __exclude_unnecessary_pages: Can't read the buffer of struct page. create_2nd_bitmap: Can't exclude unnecessary pages.
makedumpfile Failed.
......It causes makedumpfile failed.Thanks, dou.
> -Mike > > >