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#
# Copyright (c) 2022 The FreeBSD Foundation
#
# This software was developed by Mark Johnston under sponsorship from the
# FreeBSD Foundation.
#
# SPDX-License-Identifier: BSD-2-Clause
#
import gdb
from freebsd import *
from pcpu import *
class acttrace(gdb.Command):
"""
Print the stack trace of all threads that were on-CPU at the time of
the panic.
"""
def __init__(self):
super(acttrace, self).__init__("acttrace", gdb.COMMAND_USER)
def invoke(self, arg, from_tty):
# Save the current thread so that we can switch back after.
curthread = gdb.selected_thread()
for pcpu in pcpu_foreach():
td = pcpu['pc_curthread']
tid = td['td_tid']
gdb_thread = tid_to_gdb_thread(tid)
if gdb_thread is None:
raise gdb.error(f"failed to find GDB thread with TID {tid}")
else:
gdb_thread.switch()
p = td['td_proc']
print("Tracing command {} pid {} tid {} (CPU {})".format(
p['p_comm'], p['p_pid'], td['td_tid'], pcpu['pc_cpuid']))
gdb.execute("bt")
print()
curthread.switch()
# Registers the command with gdb, doesn't do anything.
acttrace()
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