Last active
September 8, 2017 14:53
-
-
Save urso/4e2c074b11ca6118f6a32a50ba3f13d4 to your computer and use it in GitHub Desktop.
add 'allgroutines <cmd>' to gdb (e.g. `(gdb) allgroutines bt`)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from __future__ import print_function | |
""" GDB 'allgoroutines' command for executing gdb command within the context of every goroutine at once """ | |
class GoroutineStacks(gdb.Command): | |
"Print stacktrace for all goroutines." | |
def __init__(self): | |
gdb.Command.__init__(self, "allgoroutines", gdb.COMMAND_STACK, gdb.COMPLETE_NONE) | |
def invoke(self, arg, _from_tty): | |
command = arg | |
def onGoRoutine(g, pc, sp): | |
try: | |
pc = int(pc) | |
except gdb.error: | |
pc = int(str(pc).split(None, 1)[0], 16) | |
save_frame = gdb.selected_frame() | |
gdb.parse_and_eval('$save_sp = $sp') | |
gdb.parse_and_eval('$save_pc = $pc') | |
gdb.parse_and_eval('$sp = {0}'.format(str(sp))) | |
gdb.parse_and_eval('$pc = {0}'.format(str(pc))) | |
try: | |
print("goroutine {} {} {}".format(g['goid'], command, 20*"=")) | |
gdb.execute(command) | |
finally: | |
gdb.parse_and_eval('$sp = $save_sp') | |
gdb.parse_and_eval('$pc = $save_pc') | |
save_frame.select() | |
eachGoRoutine(onGoRoutine) | |
def eachGoRoutine(cb): | |
vp = gdb.lookup_type('void').pointer() | |
allgs = SliceValue(gdb.parse_and_eval("'runtime.allgs'")) | |
for ptr in allgs: | |
if ptr['atomicstatus'] == 6: # 'gdead' | |
continue | |
pc, sp = ptr['sched']['pc'], ptr['sched']['sp'] | |
if sp != 0: | |
# goroutine is stopped -> report pc/sp as is stored in workqueue | |
cb(ptr, pc.cast(vp), sp.cast(vp)) | |
continue | |
pc, sp = ptr['syscallpc'], ptr['syscallsp'] | |
if sp != 0: | |
# goroutine waiting for syscall completion | |
cb(ptr, pc.cast(vp), sp.cast(vp)) | |
continue | |
# Otherwise, the goroutine is running, so it doesn't have | |
# saved scheduler state. Find G's OS thread. | |
m = ptr['m'] | |
if m == 0: | |
continue # hmmm.... No OS thread assigned | |
for thr in gdb.selected_inferior().threads(): | |
if thr.ptid[1] == m['procid']: | |
break | |
else: | |
continue # can not find OS thread in gdb | |
curthr = gdb.selected_thread() | |
try: | |
thr.switch() | |
pc = gdb.parse_and_eval('$pc') | |
sp = gdb.parse_and_eval('$sp') | |
finally: | |
curthr.switch() | |
cb(ptr, pc.cast(vp), sp.cast(vp)) | |
GoroutineStacks() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment