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Support looking for kernel modules/vmlinux in a separate base directory #17

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osandov opened this issue Oct 2, 2019 · 0 comments
Open

Support looking for kernel modules/vmlinux in a separate base directory #17

osandov opened this issue Oct 2, 2019 · 0 comments
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@osandov
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enhancement New feature or request

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@osandov
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osandov commented Oct 2, 2019

Currently, we hardcode a few standard paths where vmlinux and kernel modules can be found (vmlinux_paths and module_paths in linux_kernel.c). If the files are not available at their standard locations (e.g., because we're debugging a vmcore from another machine), then the current workaround is to specify each file with -s. However, it would be more convenient to be able specify a base directory to use instead of /lib/modules/$(uname -r).
@osandov osandov added the help wanted Extra attention is needed label Dec 4, 2019
@osandov osandov removed the help wanted Extra attention is needed label Aug 15, 2022
@osandov osandov self-assigned this Aug 15, 2022
@osandov osandov mentioned this issue Aug 15, 2022
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@osandov osandov mentioned this issue Jul 5, 2023
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@osandov osandov added the enhancement New feature or request label Jul 5, 2023
kylee0215 added a commit to kylee0215/drgn that referenced this issue Sep 4, 2024
@kylee0215
contrib: add script to dump page_owner info
dfa8d9f 
Sample output:

Page allocated via order 0, gfp_mask: 0x140cca, pid: 74, tgid: 74 (b'kworker/u32:2'), ts 1189257596 ns, free_ts 0 ns
PFN: 262203, Flags: 0x3fffe000004003c
#0  set_page_owner (./include/linux/page_owner.h:32:3)
osandov#1  post_alloc_hook (mm/page_alloc.c:1502:2)
osandov#2  prep_new_page (mm/page_alloc.c:1510:2)
osandov#3  get_page_from_freelist (mm/page_alloc.c:3489:4)
osandov#4  __alloc_pages_noprof (mm/page_alloc.c:4747:9)
osandov#5  alloc_pages_mpol_noprof (mm/mempolicy.c:2263:9)
osandov#6  folio_alloc_mpol_noprof (mm/mempolicy.c:2281:9)
osandov#7  shmem_alloc_folio (mm/shmem.c:1726:10)
osandov#8  shmem_alloc_and_add_folio (mm/shmem.c:1786:11)
osandov#9  shmem_get_folio_gfp (mm/shmem.c:2192:10)
osandov#10 shmem_get_folio (mm/shmem.c:2297:9)
osandov#11 shmem_write_begin (mm/shmem.c:2902:8)
osandov#12 generic_perform_write (mm/filemap.c:4019:12)
osandov#13 shmem_file_write_iter (mm/shmem.c:3078:8)
osandov#14 __kernel_write_iter (fs/read_write.c:523:8)
osandov#15 __kernel_write (fs/read_write.c:543:9)
osandov#16 kernel_write (fs/read_write.c:564:9)
osandov#17 kernel_write (fs/read_write.c:554:9)
osandov#18 xwrite (init/initramfs.c:33:16)
osandov#19 do_copy (init/initramfs.c:405:7)
osandov#20 write_buffer (init/initramfs.c:452:10)
osandov#21 unpack_to_rootfs (init/initramfs.c:505:14)
...

Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
kylee0215 added a commit to kylee0215/drgn that referenced this issue Sep 4, 2024
@kylee0215
contrib: add script to dump page_owner info
b5c4458 
python3 -m drgn -s ./vmlinux -c ./vmcore contrib/page_owner.py --pfn 262144

Sample output:

Page last allocated via order 0, gfp_mask: 0x140cca, pid: 74, tgid: 74 (kworker/u32:2), ts 1189257596 ns, free_ts 0 ns
PFN: 262203, Flags: 0x3fffe000004003c
#0  set_page_owner (./include/linux/page_owner.h:32:3)
osandov#1  post_alloc_hook (mm/page_alloc.c:1502:2)
osandov#2  prep_new_page (mm/page_alloc.c:1510:2)
osandov#3  get_page_from_freelist (mm/page_alloc.c:3489:4)
osandov#4  __alloc_pages_noprof (mm/page_alloc.c:4747:9)
osandov#5  alloc_pages_mpol_noprof (mm/mempolicy.c:2263:9)
osandov#6  folio_alloc_mpol_noprof (mm/mempolicy.c:2281:9)
osandov#7  shmem_alloc_folio (mm/shmem.c:1726:10)
osandov#8  shmem_alloc_and_add_folio (mm/shmem.c:1786:11)
osandov#9  shmem_get_folio_gfp (mm/shmem.c:2192:10)
osandov#10 shmem_get_folio (mm/shmem.c:2297:9)
osandov#11 shmem_write_begin (mm/shmem.c:2902:8)
osandov#12 generic_perform_write (mm/filemap.c:4019:12)
osandov#13 shmem_file_write_iter (mm/shmem.c:3078:8)
osandov#14 __kernel_write_iter (fs/read_write.c:523:8)
osandov#15 __kernel_write (fs/read_write.c:543:9)
osandov#16 kernel_write (fs/read_write.c:564:9)
osandov#17 kernel_write (fs/read_write.c:554:9)
osandov#18 xwrite (init/initramfs.c:33:16)
osandov#19 do_copy (init/initramfs.c:405:7)
osandov#20 write_buffer (init/initramfs.c:452:10)
osandov#21 unpack_to_rootfs (init/initramfs.c:505:14)
...

Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
kylee0215 added a commit to kylee0215/drgn that referenced this issue Sep 4, 2024
@kylee0215
contrib: add script to dump page_owner info
ae95d0a 
python3 -m drgn -s ./vmlinux -c ./vmcore contrib/page_owner.py --pfn 262144

Sample output:

page_owner tracks the page as allocated
Page last allocated via order 0, gfp_mask: 0x140cca, pid: 74, tgid: 74 (kworker/u32:2), ts 1187644920 ns, free_ts 0 ns
PFN: 262144, Flags: 0x3fffe000004003c
#0  set_page_owner (./include/linux/page_owner.h:32:3)
osandov#1  post_alloc_hook (mm/page_alloc.c:1502:2)
osandov#2  prep_new_page (mm/page_alloc.c:1510:2)
osandov#3  get_page_from_freelist (mm/page_alloc.c:3489:4)
osandov#4  __alloc_pages_noprof (mm/page_alloc.c:4747:9)
osandov#5  alloc_pages_mpol_noprof (mm/mempolicy.c:2263:9)
osandov#6  folio_alloc_mpol_noprof (mm/mempolicy.c:2281:9)
osandov#7  shmem_alloc_folio (mm/shmem.c:1726:10)
osandov#8  shmem_alloc_and_add_folio (mm/shmem.c:1786:11)
osandov#9  shmem_get_folio_gfp (mm/shmem.c:2192:10)
osandov#10 shmem_get_folio (mm/shmem.c:2297:9)
osandov#11 shmem_write_begin (mm/shmem.c:2902:8)
osandov#12 generic_perform_write (mm/filemap.c:4019:12)
osandov#13 shmem_file_write_iter (mm/shmem.c:3078:8)
osandov#14 __kernel_write_iter (fs/read_write.c:523:8)
osandov#15 __kernel_write (fs/read_write.c:543:9)
osandov#16 kernel_write (fs/read_write.c:564:9)
osandov#17 kernel_write (fs/read_write.c:554:9)
osandov#18 xwrite (init/initramfs.c:33:16)
osandov#19 do_copy (init/initramfs.c:405:7)
osandov#20 write_buffer (init/initramfs.c:452:10)
osandov#21 unpack_to_rootfs (init/initramfs.c:505:14)
page_owner free stack trace missing
...

Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
kylee0215 added a commit to kylee0215/drgn that referenced this issue Sep 4, 2024
@kylee0215
contrib: add script to dump page_owner information
f91b0c6 
python3 -m drgn -s ./vmlinux -c ./vmcore contrib/page_owner.py --pfn 262144

Sample output:

page_owner tracks the page as allocated
Page last allocated via order 0, gfp_mask: 0x140cca, pid: 74, tgid: 74 (kworker/u32:2), ts 1187644920 ns, free_ts 0 ns
PFN: 262144, Flags: 0x3fffe000004003c
#0  set_page_owner (./include/linux/page_owner.h:32:3)
osandov#1  post_alloc_hook (mm/page_alloc.c:1502:2)
osandov#2  prep_new_page (mm/page_alloc.c:1510:2)
osandov#3  get_page_from_freelist (mm/page_alloc.c:3489:4)
osandov#4  __alloc_pages_noprof (mm/page_alloc.c:4747:9)
osandov#5  alloc_pages_mpol_noprof (mm/mempolicy.c:2263:9)
osandov#6  folio_alloc_mpol_noprof (mm/mempolicy.c:2281:9)
osandov#7  shmem_alloc_folio (mm/shmem.c:1726:10)
osandov#8  shmem_alloc_and_add_folio (mm/shmem.c:1786:11)
osandov#9  shmem_get_folio_gfp (mm/shmem.c:2192:10)
osandov#10 shmem_get_folio (mm/shmem.c:2297:9)
osandov#11 shmem_write_begin (mm/shmem.c:2902:8)
osandov#12 generic_perform_write (mm/filemap.c:4019:12)
osandov#13 shmem_file_write_iter (mm/shmem.c:3078:8)
osandov#14 __kernel_write_iter (fs/read_write.c:523:8)
osandov#15 __kernel_write (fs/read_write.c:543:9)
osandov#16 kernel_write (fs/read_write.c:564:9)
osandov#17 kernel_write (fs/read_write.c:554:9)
osandov#18 xwrite (init/initramfs.c:33:16)
osandov#19 do_copy (init/initramfs.c:405:7)
osandov#20 write_buffer (init/initramfs.c:452:10)
osandov#21 unpack_to_rootfs (init/initramfs.c:505:14)
page_owner free stack trace missing
...

Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
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