The patch titled
Subject: scripts/gdb: add command to check list consistency
has been added to the -mm tree. Its filename is
scripts-gdb-add-command-to-check-list-consistency.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-add-command-to-check-list-consistency.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-add-command-to-check-list-consistency.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
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------------------------------------------------------
From: Thiébaud Weksteen <thiebaud@xxxxxxxxxxx>
Subject: scripts/gdb: add command to check list consistency
Add a gdb script to verify the consistency of lists.
Signed-off-by: Thiébaud Weksteen <thiebaud@xxxxxxxxxxx>
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/lists.py | 89 +++++++++++++++++++++++++++++++++++
scripts/gdb/vmlinux-gdb.py | 1
2 files changed, 90 insertions(+)
diff -puN /dev/null scripts/gdb/linux/lists.py
--- /dev/null
+++ a/scripts/gdb/linux/lists.py
@@ -0,0 +1,89 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+# list tools
+#
+# Copyright (c) Thiebaud Weksteen, 2015
+#
+# Authors:
+# Thiebaud Weksteen <thiebaud@xxxxxxxxxxx>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+
+from linux import utils
+
+list_head = utils.CachedType("struct list_head")
+
+
+def list_check(head):
+ nb = 0
+ c = head
+ if (c.type != list_head.get_type()):
+ raise gdb.GdbError('The argument should be of type (struct list_head)')
+ try:
+ gdb.write("Starting with: {}\n".format(c))
+ except gdb.MemoryError:
+ gdb.write('head is not accessible\n')
+ return
+ while True:
+ p = c['prev'].dereference()
+ n = c['next'].dereference()
+ try:
+ if p['next'] != c.address:
+ gdb.write('prev.next != current: '
+ 'current@{current_addr}={current} '
+ 'prev@{p_addr}={p}\n'.format(
+ current_addr=c.address,
+ current=c,
+ p_addr=p.address,
+ p=p,
+ ))
+ return
+ except gdb.MemoryError:
+ gdb.write('prev is not accessible: '
+ 'current@{current_addr}={current}\n'.format(
+ current_addr=c.address,
+ current=c
+ ))
+ return
+ try:
+ if n['prev'] != c.address:
+ gdb.write('next.prev != current: '
+ 'current@{current_addr}={current} '
+ 'next@{n_addr}={n}\n'.format(
+ current_addr=c.address,
+ current=c,
+ n_addr=n.address,
+ n=n,
+ ))
+ return
+ except gdb.MemoryError:
+ gdb.write('next is not accessible: '
+ 'current@{current_addr}={current}\n'.format(
+ current_addr=c.address,
+ current=c
+ ))
+ return
+ c = n
+ nb += 1
+ if c == head:
+ gdb.write("list is consistent: {} node(s)\n".format(nb))
+ return
+
+
+class LxListChk(gdb.Command):
+ """Verify a list consistency"""
+
+ def __init__(self):
+ super(LxListChk, self).__init__("lx-list-check", gdb.COMMAND_DATA)
+
+ def invoke(self, arg, from_tty):
+ argv = gdb.string_to_argv(arg)
+ if len(argv) != 1:
+ raise gdb.GdbError("lx-list-check takes one argument")
+ list_check(gdb.parse_and_eval(argv[0]))
+
+LxListChk()
diff -puN scripts/gdb/vmlinux-gdb.py~scripts-gdb-add-command-to-check-list-consistency scripts/gdb/vmlinux-gdb.py
--- a/scripts/gdb/vmlinux-gdb.py~scripts-gdb-add-command-to-check-list-consistency
+++ a/scripts/gdb/vmlinux-gdb.py
@@ -28,3 +28,4 @@ else:
import linux.dmesg
import linux.tasks
import linux.cpus
+ import linux.lists
_
Patches currently in -mm which might be from thiebaud@xxxxxxxxxxx are
scripts-gdb-add-command-to-check-list-consistency.patch
scripts-gdb-also-allow-list_head-pointer-as-lx-list-check-paramter.patch
scripts-gdb-enable-completion-for-lx-list-check-parameter.patch
scripts-gdb-fix-typo-in-exception-name.patch
scripts-gdb-fix-pep8-compliance.patch
scripts-gdb-add-ps-command.patch
scripts-gdb-remove-useless-global-instruction.patch
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