From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423646Ab2LFO5H (ORCPT ); Thu, 6 Dec 2012 09:57:07 -0500 Received: from mms2.broadcom.com ([216.31.210.18]:4171 "EHLO mms2.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423612Ab2LFO5F (ORCPT ); Thu, 6 Dec 2012 09:57:05 -0500 X-Server-Uuid: 4500596E-606A-40F9-852D-14843D8201B2 Message-ID: <50C0B236.4090200@broadcom.com> Date: Thu, 6 Dec 2012 15:56:54 +0100 From: "Piotr Haber" User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.24) Gecko/20111103 Lightning/1.0b2 Thunderbird/3.1.16 MIME-Version: 1.0 To: "Steven Rostedt" , "Frederic Weisbecker" , "Ingo Molnar" cc: "Linux Kernel Mailing List" Subject: [BUG] ftrace: available_filter_functions empty after unloading module X-Enigmail-Version: 1.1.1 X-WSS-ID: 7CDE6E1B3R015706424-01-01 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, not sure if this is a bug or just my misuse of ftrace. I get this warring after unloading a module that i traced before (used function tracer and 'brcmsmac*' as filter in set_ftrace_filter). After that reading available_filter_functions gives "No such device". Regards Piotr ------------[ cut here ]------------ WARNING: at kernel/trace/ftrace.c:1564 __ftrace_hash_rec_update.part.34+0x20d/0x250() Hardware name: Latitude E6420 Modules linked in: brcmsmac(O) brcmutil(O) bcma(O) mac80211(O) cfg80211(O) rfkill(O) arc4 cordic fuse ip6table_filter ip6_tables ebtable_nat ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter ip_tables bridge stp llc snd_hda_codec_hdmi snd_hda_codec_idt coretemp kvm_intel snd_hda_intel kvm snd_hda_codec nouveau ttm drm_kms_helper drm ghash_clmulni_intel aesni_intel snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm ablk_helper snd_seq_dummy snd_seq_oss i2c_algo_bit i2c_core mxm_wmi cryptd lrw pl2303 usbserial snd_seq_midi aes_x86_64 snd_rawmidi xts snd_seq_midi_event gf128mul snd_seq video snd_timer ppdev dell_laptop dell_wmi serio_raw sparse_keymap dcdbas snd_seq_device snd microcode lpc_ich mfd_core parport_pc wmi soundcore snd_page_alloc lp parport ipv6 ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom crc32c_intel ahci libahci sdhci_pci sdhci mmc_core e1000e [last unloaded: rfkill] Pid: 2498, comm: bash Tainted: G O 3.7.0-rc8 #3 Call Trace: [] warn_slowpath_common+0x7f/0xc0 [] warn_slowpath_null+0x1a/0x20 [] __ftrace_hash_rec_update.part.34+0x20d/0x250 [] ftrace_hash_move+0x1c5/0x1e0 [] ftrace_regex_release+0x98/0x150 [] __fput+0xcc/0x290 [] ____fput+0xe/0x10 [] task_work_run+0xa7/0xe0 [] do_notify_resume+0x74/0x80 [] ? trace_hardirqs_on_thunk+0x3a/0x3f [] int_signal+0x12/0x17 ---[ end trace 476f7270ba7905df ]---