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cli: Assume --kernel if no target is specified #5

Merged
merged 2 commits into from
Jun 28, 2019
Merged

cli: Assume --kernel if no target is specified #5

merged 2 commits into from
Jun 28, 2019

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htejun
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@htejun htejun commented Jun 18, 2019

cli currently requires one of --kernel, --core or --pid to be
specified. Let's assume --kernel so that we can get away with older
env(1) which doesn't understand -S option when writing debug scripts
which uses drgn as the interpreter. While this is a bit of a kludge,
other options aren't useful on the shebang lines anyway given that
they need an extra dynamic argument.

htejun added 2 commits June 18, 2019 08:13
@htejun
cli: Assume --kernel if no target is specified
f29706e 
cli currently requires one of --kernel, --core or --pid to be
specified.  Let's assume --kernel so that we can get away with older
env(1) which doesn't understand -S option when writing debug scripts
which uses drgn as the interpreter.  While this is a bit of a kludge,
other options aren't useful on the shebang lines anyway given that
they need an extra dynamic argument.
@htejun
doc: Drop -k and explanations on env -S
fa13ad4 
cli assumes -k by default now.  Drop explicit -k and explanations on
env -S.
@osandov osandov merged commit 88bced3 into osandov:master Jun 28, 2019
@osandov
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osandov commented Jun 28, 2019

Thanks, @htejun!

peilin-ye added a commit to peilin-ye/drgn that referenced this pull request Jan 7, 2022
@peilin-ye
libdrgn: Always fall back to libdwfl ELF relocation
b1285f8 
Simply doing "drgn" segmentation-faults on my machine:

(gdb) bt
 #0  apply_elf_rela_x86_64 (relocating=relocating@entry=0x7fc843650c90, r_offset=0, r_type=2, r_addend=0,
     sym_value=<optimized out>) at ../../libdrgn/arch_x86_64.c:498
 #1  0x00007fc88cbd523b in relocate_elf_section (platform=0x7fc843650c80, shdrnum=59, sh_addrs=0x7fc808000b20,
     symtab_scn=<optimized out>, reloc_scn=0x17614c8, scn=<optimized out>) at ../../libdrgn/debug_info.c:761
 osandov#2  relocate_elf_file (elf=<optimized out>) at ../../libdrgn/debug_info.c:865
 osandov#3  drgn_debug_info_find_sections (module=<optimized out>) at ../../libdrgn/debug_info.c:883
 osandov#4  drgn_debug_info_read_module (load=load@entry=0x7ffea9d70870, dindex_state=0x7ffea9d70810, head=0x163c6b0)
     at ../../libdrgn/debug_info.c:970
 osandov#5  0x00007fc88cbd5474 in drgn_debug_info_update_index._omp_fn.1 () at ../../libdrgn/debug_info.c:1037
 osandov#6  0x00007fc88cb19769 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
 osandov#7  0x00007fc88cb21f00 in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
 osandov#8  0x00007fc88cb1f7aa in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
 osandov#9  0x00007fc88dfb7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
 osandov#10 0x00007fc88dafe4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Always returning NULL in libdrgn/debug_info.c:relocate_elf_file() fixes
the issue.  I don't know, maybe it's a bug in drgn's implementation of
ELF relocation, but add this hack for now.

Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
@kuznet9 kuznet9 mentioned this pull request Aug 13, 2023
Open
imran-kn added a commit to imran-kn/drgn-work that referenced this pull request Mar 18, 2024
@imran-kn
contrib: add helpers to dump call stacks of a mutex owner and waiters.
69cb794 
These don't have tets cases so can't go under helpers.
I have put these under contrib so that they are available
for use.

  python3 -m drgn -s vmlinux -c vmcore contrib/locks.py --help

  usage: locks.py [-h] lock_type info_type [locks ...]

  positional arguments:
    lock_type   type of lock i.e mutex. semaphore, rwsemaphore etc.
    info_type   "owner" or "waiter" or "all"
    locks       list of lock addresses

  options:
    -h, --help  show this help message and exit

For example following command will give us call stack for owner
waiters of specified mutex(es):

  python3 -m drgn -s vmlinux -c vmcore contrib/locks.py mutex all ffffffffc0143400
  ..................
  Dumping call stack for waiter of mutex: ffffffffc0143400

  call stack for pid: 215
  #0  context_switch (kernel/sched/core.c:5238:2)
  osandov#1  __schedule (kernel/sched/core.c:6551:8)
  osandov#2  schedule (kernel/sched/core.c:6627:3)
  osandov#3  schedule_preempt_disabled (kernel/sched/core.c:6686:2)
  osandov#4  __mutex_lock_common (kernel/locking/mutex.c:679:3)
  osandov#5  __mutex_lock (kernel/locking/mutex.c:747:9)
  osandov#6  0xffffffffc01411f6
  ..................

  call stack for pid: 216
  #0  context_switch (kernel/sched/core.c:5238:2)
  osandov#1  __schedule (kernel/sched/core.c:6551:8)
  osandov#2  schedule (kernel/sched/core.c:6627:3)
  osandov#3  schedule_preempt_disabled (kernel/sched/core.c:6686:2)
  osandov#4  __mutex_lock_common (kernel/locking/mutex.c:679:3)
  osandov#5  __mutex_lock (kernel/locking/mutex.c:747:9)
  osandov#6  0xffffffffc014112b
  ..................

  Dumping call stack for owner of mutex: ffffffffc0143400

  call stack for pid: 214
  #0  delay_tsc (arch/x86/lib/delay.c:79:3)
  osandov#1  0xffffffffc0141308
  ..................

  Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
imran-kn added a commit to imran-kn/drgn-work that referenced this pull request Mar 18, 2024
@imran-kn
contrib: add helpers to dump call stacks of semaphore's waiters.
e749e3f 
python3 -m drgn -s vmlinux -c vmcore contrib/locks.py --help

usage: locks.py [-h] lock_type info_type [locks ...]

positional arguments:
lock_type   type of lock i.e mutex. semaphore, rwsemaphore etc.
info_type   "owner" or "waiter" or "all"
locks       list of lock addresses

options:
-h, --help  show this help message and exit

For example following command will give us call stack for owner
waiters of specified mutex(es):

python3 -m drgn -s vmlinux -c vmcore contrib/locks.py semaphore waiter ffffffffc0097340
Dumping call stack for waiter(s) of semaphore: ffffffffc0097340

call stack for pid: 1178
 #0  context_switch (kernel/sched/core.c:2811:2)
 osandov#1  __schedule (kernel/sched/core.c:3387:8)
 osandov#2  schedule (kernel/sched/core.c:3431:3)
 osandov#3  schedule_timeout (kernel/time/timer.c:1724:3)
 osandov#4  __down_common (kernel/locking/semaphore.c:221:13)
 osandov#5  __down (kernel/locking/semaphore.c:238:2)
 osandov#6  down (kernel/locking/semaphore.c:62:3)
 osandov#7  0xffffffffc0095045

..................

 call stack for pid: 1180
 #0  context_switch (kernel/sched/core.c:2811:2)
 osandov#1  __schedule (kernel/sched/core.c:3387:8)
 osandov#2  schedule (kernel/sched/core.c:3431:3)
 osandov#3  schedule_timeout (kernel/time/timer.c:1724:3)
 osandov#4  __down_common (kernel/locking/semaphore.c:221:13)
 osandov#5  __down (kernel/locking/semaphore.c:238:2)
 osandov#6  down (kernel/locking/semaphore.c:62:3)
 osandov#7  0xffffffffc0095045
 .............

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
imran-kn added a commit to imran-kn/drgn-work that referenced this pull request Mar 18, 2024
@imran-kn
contrib: locks: add rwsem helpers.
2937bf2 
Add some ready-made helpers for rwsem and make the script
modular so that options can be added/removed for one lock
type, independently from other lock types.

Some example of using the script have been given below:

python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py -h
usage: drgn script to dump lock information [-h] {mutex,semaphore,rwsem} ...

options:
  -h, --help            show this help message and exit

subcommands:
  {mutex,semaphore,rwsem}
    mutex               get mutex info.
    semaphore           get semaphore info.
    rwsem               get read-write semaphore info.

python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py semaphore -h
usage: drgn script to dump lock information semaphore [-h] [--info | --waiter-list | --waiter-callstack] [locks ...]

positional arguments:
  locks               list of lock addresses

options:
  -h, --help          show this help message and exit
  --info              dump given semaphore's info like waiter(s) etc.
  --waiter-list       provide a list, of waiters of given semaphore(s)
  --waiter-callstack  provide callstack of all waiters of given semaphore(s)

python3 -m drgn -s vmlinux -c vmcore contrib/locks.py semaphore --waiter-list ffffffffc0097340
  The waiters of semaphore: ffffffffc0097340 are as follows:
    (struct task_struct *)0xffff992afc618000 pid: 1178 state: D
    (struct task_struct *)0xffff992afc7ae200 pid: 1181 state: D
    (struct task_struct *)0xffff992afc61ee40 pid: 1179 state: D
    (struct task_struct *)0xffff992afc619880 pid: 1180 state: D

python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py semaphore --waiter-list ffffffffc0262340
  The waiters of semaphore: ffffffffc0262340 are as follows:
    (struct task_struct *)0xffff96c3fc6ec980 pid: 1178 state: S
    (struct task_struct *)0xffff96c3fc6eee40 pid: 1177 state: S
    (struct task_struct *)0xffff96c3fc5a55c0 pid: 1175 state: S
    (struct task_struct *)0xffff96c3fc6ee200 pid: 1176 state: S

python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py semaphore --waiter-callstack ffffffffc0262340
Dumping call stack for waiter(s) of semaphore: ffffffffc0262340

call stack for pid: 1178
 #0  context_switch (kernel/sched/core.c:2811:2)
 osandov#1  __schedule (kernel/sched/core.c:3387:8)
 osandov#2  schedule (kernel/sched/core.c:3431:3)
 osandov#3  schedule_timeout (kernel/time/timer.c:1724:3)
 osandov#4  __down_common (kernel/locking/semaphore.c:221:13)
 osandov#5  __down_interruptible (kernel/locking/semaphore.c:243:9)
 osandov#6  down_interruptible (kernel/locking/semaphore.c:85:12)
 osandov#7  0xffffffffc0260045
.....................

call stack for pid: 1176
 #0  context_switch (kernel/sched/core.c:2811:2)
 osandov#1  __schedule (kernel/sched/core.c:3387:8)
 osandov#2  schedule (kernel/sched/core.c:3431:3)
 osandov#3  schedule_timeout (kernel/time/timer.c:1724:3)
 osandov#4  __down_common (kernel/locking/semaphore.c:221:13)
 osandov#5  __down_interruptible (kernel/locking/semaphore.c:243:9)
 osandov#6  down_interruptible (kernel/locking/semaphore.c:85:12)
 osandov#7  0xffffffffc0260045
call stack for pid: 1176
.....................

python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py mutex -h
usage: drgn script to dump lock information mutex [-h] [--info | --waiter-list | --waiter-callstack | --owner-callstack] [locks ...]

positional arguments:
  locks               list of lock addresses

options:
  -h, --help          show this help message and exit
  --info              dump given mutex's info like owner, waiter(s) etc.
  --waiter-list       provide a list, of waiters of given mutex(es)
  --waiter-callstack  provide callstack of all waiters of given mutex(es)
  --owner-callstack   provide callstack of owner of given mutex(es)

python3 -m drgn -s vmlinux -c vmcore contrib/locks.py mutex --info ffffffffc0143400
  mutex: ffffffffc0143400 is owned by (struct task_struct *)0xffffa1fe42393900 pid: 214 state: R
  The waiters of mutex: ffffffffc0143400 are as follows:
    (struct task_struct *)0xffffa1fe42395580 pid: 215 state: D
    (struct task_struct *)0xffffa1fe42a58000 pid: 216 state: D
    (struct task_struct *)0xffffa1fe42389c80 pid: 217 state: D

python3 -m drgn -s vmlinux -c vmcore contrib/locks.py mutex --waiter-list ffffffffc0143400
  The waiters of mutex: ffffffffc0143400 are as follows:
    (struct task_struct *)0xffffa1fe42395580 pid: 215 state: D
    (struct task_struct *)0xffffa1fe42a58000 pid: 216 state: D
    (struct task_struct *)0xffffa1fe42389c80 pid: 217 state: D

python3 -m drgn -s vmlinux -c vmcore contrib/locks.py mutex --waiter-callstack ffffffffc0143400
Dumping call stack for waiter of mutex: ffffffffc0143400

call stack for pid: 215
 #0  context_switch (kernel/sched/core.c:5238:2)
 osandov#1  __schedule (kernel/sched/core.c:6551:8)
 osandov#2  schedule (kernel/sched/core.c:6627:3)
 osandov#3  schedule_preempt_disabled (kernel/sched/core.c:6686:2)
 osandov#4  __mutex_lock_common (kernel/locking/mutex.c:679:3)
 osandov#5  __mutex_lock (kernel/locking/mutex.c:747:9)
 osandov#6  0xffffffffc01411f6
........................

python3 -m drgn -s vmlinux -c vmcore-multiple-readers contrib/locks.py rwsem -h
usage: drgn script to dump lock information rwsem [-h] [--info | --waiter-list | --waiter-callstack | --owner-callstack] [locks ...]

positional arguments:
  locks               list of lock addresses

options:
  -h, --help          show this help message and exit
  --info              dump given rwsem's info like owner, waiter(s) etc.
  --waiter-list       provide a list, of waiters of given rwsem(s)
  --waiter-callstack  provide callstack of all waiters of given rwsem(s)
  --owner-callstack   provide callstack of owner of given rwsem(s)

python3 -m drgn -s vmlinux -c vmcore-reader-writer-reader-reader contrib/locks.py rwsem --info ffffffffc036d3c0
  rwsem: ffffffffc036d3c0 is owned by one or more readers.
  The waiters of rwsem are as follows:
    (struct task_struct *)0xffff9e593d4e3100: (pid)1175: type: down_write state: D
    (struct task_struct *)0xffff9e593d4e1880: (pid)1176: type: down_read state: D
    (struct task_struct *)0xffff9e593d4e6200: (pid)1177: type: down_read state: D

python3 -m drgn -s vmlinux -c vmcore-reader-writer-reader-reader contrib/locks.py rwsem --waiter-callstack ffffffffc036d3c0
Dumping call stack for waiter of rwsem: ffffffffc036d3c0

call stack for pid: 1175
 #0  context_switch (kernel/sched/core.c:2814:2)
 osandov#1  __schedule (kernel/sched/core.c:3389:8)
 osandov#2  schedule (kernel/sched/core.c:3433:3)
 osandov#3  __rwsem_down_write_failed_common (kernel/locking/rwsem-xadd.c:588:4)
 osandov#4  call_rwsem_down_write_failed+0x13/0x1f (arch/x86/lib/rwsem.S:105)
 osandov#5  __down_write (./arch/x86/include/asm/rwsem.h:126:2)
 osandov#6  down_write (kernel/locking/rwsem.c:56:2)
 osandov#7  0xffffffffc036b2b6
................................

python3 -m drgn -s vmlinux -c vmcore-writer-reader-reader-reader contrib/locks.py rwsem --info ffffffffc02033c0
  rwsem: ffffffffc02033c0 owned by writer (struct task_struct *)0xffff9162fdb58c40  (pid)1173  (state)R
  The waiters of rwsem are as follows:
    (struct task_struct *)0xffff9162fdb5ee40: (pid)1174: type: down_read state: D
    (struct task_struct *)0xffff9162fd8355c0: (pid)1175: type: down_read state: D
    (struct task_struct *)0xffff9162fd836200: (pid)1176: type: down_read state: D

For newer kernels number of read owners can be obtained:

python3 -m drgn -s vmlinux -c vmcore-multiple-readers contrib/locks.py rwsem --info ffffffffc00c9340
  rwsem: ffffffffc00c9340 is owned by 2 reader(s).
  There are no waiters for rwsem: ffffffffc00c9340.

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
imran-kn added a commit to imran-kn/drgn-work that referenced this pull request Mar 18, 2024
@imran-kn
contrib: locks: add optimistic-spinner info in rwsem helpers.
96bffa9 
For example:

python3 -m drgn -s vmlinux -c vmcore-writer-reader-reader-reader contrib/locks.py rwsem --spinner-callstack ffffffffc03083c0
rwsem: ffffffffc03083c0 has 1 spinners and their call-stack is as follows:

call stack for pid: 239
 #0  __read_once_size (./include/linux/compiler.h:268:2)
 osandov#1  arch_atomic64_read (./arch/x86/include/asm/atomic64_64.h:22:9)
 osandov#2  atomic64_read (./include/asm-generic/atomic-instrumented.h:837:9)
 osandov#3  atomic_long_read (./include/asm-generic/atomic-long.h:28:9)
 osandov#4  rwsem_owner_flags (kernel/locking/rwsem.c:298:24)
 osandov#5  rwsem_spin_on_owner (kernel/locking/rwsem.c:737:9)
 osandov#6  rwsem_optimistic_spin (kernel/locking/rwsem.c:812:17)
 osandov#7  rwsem_down_read_slowpath (kernel/locking/rwsem.c:1018:6)
 osandov#8  __down_read_killable (kernel/locking/rwsem.c:1366:14)
 osandov#9  down_read_killable (kernel/locking/rwsem.c:1532:6)
 osandov#10 0xffffffffc030622c
.................

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
imran-kn added a commit to imran-kn/drgn-work that referenced this pull request Mar 18, 2024
@imran-kn
contrib: locks: add optimistic-spinner info in mutex helpers.
62add44 
For example:
python3 -m drgn -s vmlinux -c vmcore-1 contrib/locks.py mutex --spinner-callstack ffffffffc02af340
mutex: ffffffffc02af340 has 4 spinners and their call-stack is as follows:

call stack for pid: 250
 #0  __read_once_size (./include/linux/compiler.h:268:2)
 osandov#1  osq_lock (kernel/locking/osq_lock.c:137:10)
 osandov#2  mutex_optimistic_spin (kernel/locking/mutex.c:667:8)
 osandov#3  __mutex_lock_common (kernel/locking/mutex.c:971:6)
 osandov#4  __mutex_lock (kernel/locking/mutex.c:1109:9)
 osandov#5  0xffffffffc02ad045
 ......................

call stack for pid: 251
 #0  __read_once_size (./include/linux/compiler.h:268:2)
 osandov#1  osq_lock (kernel/locking/osq_lock.c:137:10)
 osandov#2  mutex_optimistic_spin (kernel/locking/mutex.c:667:8)
 osandov#3  __mutex_lock_common (kernel/locking/mutex.c:971:6)
 osandov#4  __mutex_lock (kernel/locking/mutex.c:1109:9)
 osandov#5  0xffffffffc02ad045
 .....................

call stack for pid: 248
 #0  __read_once_size (./include/linux/compiler.h:268:2)
 osandov#1  osq_lock (kernel/locking/osq_lock.c:137:10)
 osandov#2  mutex_optimistic_spin (kernel/locking/mutex.c:667:8)
 osandov#3  __mutex_lock_common (kernel/locking/mutex.c:971:6)
 osandov#4  __mutex_lock (kernel/locking/mutex.c:1109:9)
 osandov#5  0xffffffffc02ad045
.....................

call stack for pid: 249
 #0  __read_once_size (./include/linux/compiler.h:268:2)
 osandov#1  arch_atomic64_read (./arch/x86/include/asm/atomic64_64.h:22:9)
 osandov#2  atomic64_read (./include/asm-generic/atomic-instrumented.h:837:9)
 osandov#3  atomic_long_read (./include/asm-generic/atomic-long.h:28:9)
 osandov#4  __mutex_owner (kernel/locking/mutex.c:75:32)
 osandov#5  mutex_spin_on_owner (kernel/locking/mutex.c:566:9)
 osandov#6  mutex_optimistic_spin (kernel/locking/mutex.c:683:8)
 osandov#7  __mutex_lock_common (kernel/locking/mutex.c:971:6)
 osandov#8  __mutex_lock (kernel/locking/mutex.c:1109:9)
 osandov#9  0xffffffffc02ad045
....................

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
kylee0215 added a commit to kylee0215/drgn that referenced this pull request 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 pull request 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 pull request 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 pull request 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>
kylee0215 added a commit to kylee0215/drgn that referenced this pull request Oct 29, 2024
@kylee0215
contrib: add script to dump page_owner information
4a3f7b2 
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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2 participants
@htejun @osandov