diff options
author | Mark Johnston <markj@FreeBSD.org> | 2024-01-15 20:39:26 +0000 |
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committer | Mark Johnston <markj@FreeBSD.org> | 2024-01-15 21:36:40 +0000 |
commit | 2524b7dfb0df7e37ea9651559ce6c027b006e2a9 (patch) | |
tree | 1af1761dbff64e3ef8d7232dbea34c1ae3d8a91c /libexec | |
parent | b9e8ae1d8a424194b4e185359da4ded163f24f4e (diff) | |
download | src-2524b7dfb0df7e37ea9651559ce6c027b006e2a9.tar.gz src-2524b7dfb0df7e37ea9651559ce6c027b006e2a9.zip |
crashinfo: Print stack traces for all on-CPU threads
Add a python script which implements the bulk of this functionality.
Over time, this would ideally evolve into a library of python routines
which can be used to inspect kernel data structures and automate some
debugging tasks, similar to jhb's out-of-tree scripts, but written in a
somewhat nicer language and with better integration into the kgdb
command prompt.
Note that kgdb currently won't auto-load scripts in this directory.
This should perhaps change in the future. It probably also makes more
sense to have a crashinfo.py which provides all the kgdb output that we
want to include in core.txt, rather than having crashinfo.sh pipe in
several commands.
Reviewed by: avg, imp
Discussed with: jhb
MFC after: 3 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33817
Diffstat (limited to 'libexec')
-rw-r--r-- | libexec/Makefile | 2 | ||||
-rw-r--r-- | libexec/kgdb/Makefile | 5 | ||||
-rw-r--r-- | libexec/kgdb/acttrace.py | 63 |
3 files changed, 69 insertions, 1 deletions
diff --git a/libexec/Makefile b/libexec/Makefile index 5f7f652df6ed..ee354fa60e79 100644 --- a/libexec/Makefile +++ b/libexec/Makefile @@ -1,4 +1,3 @@ - .include <src.opts.mk> .include <bsd.compat.pre.mk> @@ -11,6 +10,7 @@ SUBDIR= ${_atf} \ flua \ getty \ ${_hyperv} \ + kgdb \ ${_mail.local} \ ${_makewhatis.local} \ ${_mknetid} \ diff --git a/libexec/kgdb/Makefile b/libexec/kgdb/Makefile new file mode 100644 index 000000000000..f6b255ab4f60 --- /dev/null +++ b/libexec/kgdb/Makefile @@ -0,0 +1,5 @@ +FILESDIR?= /usr/libexec/kgdb + +FILES= acttrace.py + +.include <bsd.prog.mk> diff --git a/libexec/kgdb/acttrace.py b/libexec/kgdb/acttrace.py new file mode 100644 index 000000000000..3229ff708de1 --- /dev/null +++ b/libexec/kgdb/acttrace.py @@ -0,0 +1,63 @@ +#- +# Copyright (c) 2022 The FreeBSD Foundation +# +# This software was developed by Mark Johnston under sponsorship from the +# FreeBSD Foundation. +# + +import gdb + + +def symval(name): + return gdb.lookup_global_symbol(name).value() + + +def tid_to_gdb_thread(tid): + for thread in gdb.inferiors()[0].threads(): + if thread.ptid[2] == tid: + return thread + else: + return None + + +def all_pcpus(): + mp_maxid = symval("mp_maxid") + cpuid_to_pcpu = symval("cpuid_to_pcpu") + + cpu = 0 + while cpu <= mp_maxid: + pcpu = cpuid_to_pcpu[cpu] + if pcpu: + yield pcpu + cpu = cpu + 1 + + +class acttrace(gdb.Command): + 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 all_pcpus(): + td = pcpu['pc_curthread'] + tid = td['td_tid'] + + gdb_thread = tid_to_gdb_thread(tid) + if gdb_thread is None: + print("failed to find GDB thread with TID {}".format(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() |