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1#
2# This file contains a few gdb macros (user defined commands) to extract
3# useful information from kernel crashdump (kdump) like stack traces of
4# all the processes or a particular process and trapinfo.
5#
6# These macros can be used by copying this file in .gdbinit (put in home
7# directory or current directory) or by invoking gdb command with
8# --command=<command-file-name> option
9#
10# Credits:
11# Alexander Nyberg <alexn@telia.com>
12# V Srivatsa <vatsa@in.ibm.com>
13# Maneesh Soni <maneesh@in.ibm.com>
14#
15
16define bttnobp
17 set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
18 set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
19 set $init_t=&init_task
20 set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
21 while ($next_t != $init_t)
22 set $next_t=(struct task_struct *)$next_t
23 printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
24 printf "===================\n"
25 set var $stackp = $next_t.thread.esp
26 set var $stack_top = ($stackp & ~4095) + 4096
27
28 while ($stackp < $stack_top)
29 if (*($stackp) > _stext && *($stackp) < _sinittext)
30 info symbol *($stackp)
31 end
32 set $stackp += 4
33 end
34 set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
35 while ($next_th != $next_t)
36 set $next_th=(struct task_struct *)$next_th
37 printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
38 printf "===================\n"
39 set var $stackp = $next_t.thread.esp
40 set var $stack_top = ($stackp & ~4095) + 4096
41
42 while ($stackp < $stack_top)
43 if (*($stackp) > _stext && *($stackp) < _sinittext)
44 info symbol *($stackp)
45 end
46 set $stackp += 4
47 end
48 set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
49 end
50 set $next_t=(char *)($next_t->tasks.next) - $tasks_off
51 end
52end
53document bttnobp
54 dump all thread stack traces on a kernel compiled with !CONFIG_FRAME_POINTER
55end
56
57define btt
58 set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
59 set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
60 set $init_t=&init_task
61 set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
62 while ($next_t != $init_t)
63 set $next_t=(struct task_struct *)$next_t
64 printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
65 printf "===================\n"
66 set var $stackp = $next_t.thread.esp
67 set var $stack_top = ($stackp & ~4095) + 4096
68 set var $stack_bot = ($stackp & ~4095)
69
70 set $stackp = *($stackp)
71 while (($stackp < $stack_top) && ($stackp > $stack_bot))
72 set var $addr = *($stackp + 4)
73 info symbol $addr
74 set $stackp = *($stackp)
75 end
76
77 set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
78 while ($next_th != $next_t)
79 set $next_th=(struct task_struct *)$next_th
80 printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
81 printf "===================\n"
82 set var $stackp = $next_t.thread.esp
83 set var $stack_top = ($stackp & ~4095) + 4096
84 set var $stack_bot = ($stackp & ~4095)
85
86 set $stackp = *($stackp)
87 while (($stackp < $stack_top) && ($stackp > $stack_bot))
88 set var $addr = *($stackp + 4)
89 info symbol $addr
90 set $stackp = *($stackp)
91 end
92 set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
93 end
94 set $next_t=(char *)($next_t->tasks.next) - $tasks_off
95 end
96end
97document btt
98 dump all thread stack traces on a kernel compiled with CONFIG_FRAME_POINTER
99end
100
101define btpid
102 set var $pid = $arg0
103 set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
104 set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
105 set $init_t=&init_task
106 set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
107 set var $pid_task = 0
108
109 while ($next_t != $init_t)
110 set $next_t=(struct task_struct *)$next_t
111
112 if ($next_t.pid == $pid)
113 set $pid_task = $next_t
114 end
115
116 set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
117 while ($next_th != $next_t)
118 set $next_th=(struct task_struct *)$next_th
119 if ($next_th.pid == $pid)
120 set $pid_task = $next_th
121 end
122 set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
123 end
124 set $next_t=(char *)($next_t->tasks.next) - $tasks_off
125 end
126
127 printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm
128 printf "===================\n"
129 set var $stackp = $pid_task.thread.esp
130 set var $stack_top = ($stackp & ~4095) + 4096
131 set var $stack_bot = ($stackp & ~4095)
132
133 set $stackp = *($stackp)
134 while (($stackp < $stack_top) && ($stackp > $stack_bot))
135 set var $addr = *($stackp + 4)
136 info symbol $addr
137 set $stackp = *($stackp)
138 end
139end
140document btpid
141 backtrace of pid
142end
143
144
145define trapinfo
146 set var $pid = $arg0
147 set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
148 set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
149 set $init_t=&init_task
150 set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
151 set var $pid_task = 0
152
153 while ($next_t != $init_t)
154 set $next_t=(struct task_struct *)$next_t
155
156 if ($next_t.pid == $pid)
157 set $pid_task = $next_t
158 end
159
160 set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
161 while ($next_th != $next_t)
162 set $next_th=(struct task_struct *)$next_th
163 if ($next_th.pid == $pid)
164 set $pid_task = $next_th
165 end
166 set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
167 end
168 set $next_t=(char *)($next_t->tasks.next) - $tasks_off
169 end
170
171 printf "Trapno %ld, cr2 0x%lx, error_code %ld\n", $pid_task.thread.trap_no, \
172 $pid_task.thread.cr2, $pid_task.thread.error_code
173
174end
175document trapinfo
176 Run info threads and lookup pid of thread #1
177 'trapinfo <pid>' will tell you by which trap & possibly
178 addresthe kernel paniced.
179end
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