NAME
task - task_struct and thread_info contents
SYNOPSIS
task [-R member[,member]] [-dx] [pid | taskp] ...
DESCRIPTION
This command dumps a formatted display of the contents of a task's
task_struct and thread_info structures. Multiple task or PID numbers
may be entered; if no arguments are entered, the task_struct and
thread_info structures of the current context are displayed. The -R option,
which may also be invoked indirectly via "foreach task", pares the output
down to one or more structure members.
pid a process PID.
taskp a hexadecimal task_struct pointer.
-R member a comma-separated list of one or more task_struct and/or
thread_info structure members. If any member contains an embedded
structure, or is an array, the output may be restricted to the
embedded structure or an array element by expressing the member
argument as "member.member" or "member[index]"; embedded member
specifications may extend beyond one level deep, by expressing the
member argument as "member.member.member...".
-x override default output format with hexadecimal format.
-d override default output format with decimal format.
EXAMPLES
Dump the task_struct and thread_info structures of the current context
in hexadecimal format:
crash> task -x
PID: 3176 TASK: f2451550 CPU: 1 COMMAND: "memtest"
struct task_struct {
state = 0x0,
stack = 0xf05b6000,
usage = {
counter = 0x2
},
flags = 0x402040,
ptrace = 0x0,
lock_depth = 0xffffffff,
prio = 0x78,
static_prio = 0x78,
normal_prio = 0x78,
rt_priority = 0x0,
...
perf_event_ctxp = {0x0, 0x0},
memcg_batch = {
do_batch = 0x0,
memcg = 0x0,
bytes = 0x0,
memsw_bytes = 0x0
}
}
struct thread_info {
task = 0xf2451550,
exec_domain = 0xc0a60860,
flags = 0x88,
status = 0x0,
cpu = 0x1,
preempt_count = 0x4010000,
addr_limit = {
seg = 0xc0000000
},
restart_block = {
...
Display the ngroups and groups task_struct members for PID 2958:
crash> task -R ngroups,groups 2958
PID: 2958 TASK: c6718000 CPU: 0 COMMAND: "bash"
ngroups = 6,
groups = {504, 8, 9, 1000, 1007, 1006, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
Display the embedded sched_entity structure's on_rq member:
crash> task -R se.on_rq
PID: 6529 TASK: ffff880116538790 CPU: 1 COMMAND: "bash"
se.on_rq = 1,
Display the 3rd pid_link structure in the embedded pids[] array:
crash> task -R pids[2]
PID: 6529 TASK: ffff880116538790 CPU: 0 COMMAND: "bash"
pids[2] = {
node = {
next = 0xffff8801165391b0,
pprev = 0xffff880209d011b0
},
pid = 0xffff8801f0876e00
}
NOTE: When this command is invoked directly (i.e., not from "foreach"), it
is not necessary to include the "-R" before the task_struct/thread_info
member name(s).
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