linux.git/scripts/gdb/linux/proc.py, branch v6.12.80

scripts/gdb: fix lx-mounts command error

2024-09-02T03:43:28+00:00

(gdb) lx-mounts
      mount          super_block     devname pathname fstype options
Python Exception : There is no member named list.
Error occurred in Python: There is no member named list.

We encounter the above issue after commit 2eea9ce4310d ("mounts: keep
list of mounts in an rbtree"). The commit move a mount from list into
rbtree.

So we can instead use rbtree to iterate all mounts information.

Link: https://lkml.kernel.org/r/20240723064902.124154-4-kuan-ying.lee@canonical.com
Fixes: 2eea9ce4310d ("mounts: keep list of mounts in an rbtree")
Signed-off-by: Kuan-Ying Lee 
Cc: Jan Kiszka 
Cc: Kieran Bingham 
Cc: 
Signed-off-by: Andrew Morton

scripts/gdb: create linux/vfs.py for VFS related GDB helpers

2023-04-18T23:39:34+00:00

Patch series "GDB VFS utils".

I've created a couple GDB convenience functions that I found useful when
debugging some VFS issues and figure others might find them useful.  For
instance, they are useful in setting conditional breakpoints on VFS
functions where you only care if the dentry path is a certain value.  I
took the opportunity to create a new "vfs" python module to give VFS
related utilities a home.


This patch (of 2):

This will allow for more VFS specific GDB helpers to be collected in one
place.  Move utils.dentry_name into the vfs modules.  Also a local
variable in proc.py was changed from vfs to mnt to prevent a naming
collision with the new vfs module.

[akpm@linux-foundation.org: add SPDX-License-Identifier]
Link: https://lkml.kernel.org/r/cover.1677631565.git.development@efficientek.com
Link: https://lkml.kernel.org/r/7bba4c065a8c2c47f1fc5b03a7278005b04db251.1677631565.git.development@efficientek.com
Signed-off-by: Glenn Washburn 
Cc: Alexander Viro 
Cc: Antonio Borneo 
Cc: Jan Kiszka 
Cc: John Ogness 
Cc: Kieran Bingham 
Cc: Petr Mladek 
Signed-off-by: Andrew Morton

scripts/gdb/proc: add struct mount & struct super_block addr in lx-mounts command

2020-10-16T18:11:22+00:00

This is many times found useful while debugging some FS related
issue.


      mount          super_block     devname pathname fstype options
0xffff888a0bfa4b40 0xffff888a0bfc1000 none / rootfs rw 0 0
0xffff888a033f75c0 0xffff8889fcf65000 /dev/root / ext4 rw,relatime 0 0
0xffff8889fc8ce040 0xffff888a0bb51000 devtmpfs /dev devtmpfs rw,relatime 0 0

Signed-off-by: Ritesh Harjani 
Signed-off-by: Andrew Morton 
Reviewed-by: Jan Kiszka 
Cc: Kieran Bingham 
Link: http://lkml.kernel.org/r/a3c4177e1597b3e06d66d55e07d72c0c46a03571.1597742951.git.riteshh@linux.ibm.com
Signed-off-by: Linus Torvalds

scripts/gdb: silence pep8 checks

2019-05-15T02:52:52+00:00

These scripts have some pep8 style warnings.  Fix them up so that this
directory is all pep8 clean.

Link: http://lkml.kernel.org/r/20190329220844.38234-6-swboyd@chromium.org
Signed-off-by: Stephen Boyd 
Cc: Douglas Anderson 
Cc: Nikolay Borisov 
Cc: Kieran Bingham 
Cc: Jan Kiszka 
Cc: Jackie Liu 
Cc: Jason Wessel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: replace flags (MS_xyz -> SB_xyz)

2019-03-08T02:32:02+00:00

Since commit 1751e8a6cb93 ("Rename superblock flags (MS_xyz ->
SB_xyz)"), scripts/gdb should be updated to replace MS_xyz with SB_xyz.

This change didn't directly affect the running operation of scripts/gdb
until commit e262e32d6bde "vfs: Suppress MS_* flag defs within the
kernel unless explicitly enabled" removed the definitions used by
constants.py.

Update constants.py.in to utilise the new internal flags, matching the
implementation at fs/proc_namespace.c::show_sb_opts.

Note to stable, e262e32d6bde landed in v5.0-rc1 (which was just
released), so we'll want this picked back to 5.0 stable once this patch
hits mainline (akpm just picked it up).  Without this, debugging a
kernel a kernel via GDB+QEMU is broken in the 5.0 release.

[kieran.bingham@ideasonboard.com: add fixes tag, reword commit message]
Link: http://lkml.kernel.org/r/20190305103014.25847-1-kieran.bingham@ideasonboard.com
Fixes: e262e32d6bde "vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled"
Signed-off-by: Jackie Liu 
Signed-off-by: Kieran Bingham 
Tested-by: Nick Desaulniers 
Tested-by: Kieran Bingham 
Cc: Felipe Balbi 
Cc: Dan Robertson 
Cc: Jan Kiszka 
Cc: David Howells 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: fix lx-version string output

2019-01-04T21:13:47+00:00

A bug is present in GDB which causes early string termination when
parsing variables.  This has been reported [0], but we should ensure
that we can support at least basic printing of the core kernel strings.

For current gdb version (has been tested with 7.3 and 8.1), 'lx-version'
only prints one character.

  (gdb) lx-version
  L(gdb)

This can be fixed by casting 'linux_banner' as (char *).

  (gdb) lx-version
  Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018

[0] https://sourceware.org/bugzilla/show_bug.cgi?id=20077

[kbingham@kernel.org: add detail to commit message]
Link: http://lkml.kernel.org/r/20181111162035.8356-1-kieran.bingham@ideasonboard.com
Fixes: 2d061d999424 ("scripts/gdb: add version command")
Signed-off-by: Du Changbin 
Signed-off-by: Kieran Bingham 
Acked-by: Jan Kiszka 
Cc: Jan Kiszka 
Cc: Jason Wessel 
Cc: Daniel Thompson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add lx-fdtdump command

2017-07-12T23:26:00+00:00

lx-fdtdump dumps the flattened device tree passed to the kernel from the
bootloader to the filename specified as the command argument.  If no
argument is provided it defaults to fdtdump.dtb.  This then allows
further post processing on the machine running GDB.  The fdt header is
also also printed in the GDB console.  For example:

  (gdb) lx-fdtdump
  fdt_magic:         0xD00DFEED
  fdt_totalsize:     0xC108
  off_dt_struct:     0x38
  off_dt_strings:    0x3804
  off_mem_rsvmap:    0x28
  version:           17
  last_comp_version: 16
  Dumped fdt to fdtdump.dtb

  >fdtdump fdtdump.dtb | less

This command is useful as the bootloader can often re-write parts of the
device tree, and this can sometimes cause the kernel to not boot.

Link: http://lkml.kernel.org/r/1481280065-5336-2-git-send-email-kbingham@kernel.org
Signed-off-by: Peter Griffin 
Signed-off-by: Kieran Bingham 
Cc: Jason Wessel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add mount point list command

2016-05-24T00:04:14+00:00

lx-mounts will identify current mount points based on the 'init_task'
namespace by default, as we do not yet have a kernel thread list
implementation to select the current running thread.

Optionally, a user can specify a PID to list from that process'
namespace

Link: http://lkml.kernel.org/r/e614c7bc32d2350b4ff1627ec761a7148e65bfe6.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham 
Signed-off-by: Jan Kiszka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add io resource readers

2016-05-24T00:04:14+00:00

Provide iomem_resource and ioports_resource printers and command hooks

It can be quite interesting to halt the kernel as it's booting and check
to see this list as it is being populated.

It should be useful in the event that a kernel is not booting, you can
identify what memory resources have been registered

Link: http://lkml.kernel.org/r/f0a6b9fa9c92af4d7ed2e7343ccc84150e9c6fc5.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham 
Signed-off-by: Jan Kiszka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add cmdline reader command

2016-03-22T22:36:02+00:00

lx-cmdline Report the Linux Commandline used in the current kernel

[jan.kiszka@siemens.com: remove blank line from help output and fix pep8 warning]
Signed-off-by: Kieran Bingham 
Signed-off-by: Jan Kiszka 
Cc: Jason Wessel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds