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Message-ID: <50C0B236.4090200@broadcom.com> Date: Thu, 6 Dec 2012 15:56:54 +0100 From: "Piotr Haber" <phaber@...adcom.com> To: "Steven Rostedt" <rostedt@...dmis.org>, "Frederic Weisbecker" <fweisbec@...il.com>, "Ingo Molnar" <mingo@...hat.com> cc: "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org> Subject: [BUG] ftrace: available_filter_functions empty after unloading module 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: [<ffffffff810574ff>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8105755a>] warn_slowpath_null+0x1a/0x20 [<ffffffff810fdd7d>] __ftrace_hash_rec_update.part.34+0x20d/0x250 [<ffffffff810fea15>] ftrace_hash_move+0x1c5/0x1e0 [<ffffffff81100388>] ftrace_regex_release+0x98/0x150 [<ffffffff8118f7ac>] __fput+0xcc/0x290 [<ffffffff8118f97e>] ____fput+0xe/0x10 [<ffffffff810798e7>] task_work_run+0xa7/0xe0 [<ffffffff81015a64>] do_notify_resume+0x74/0x80 [<ffffffff81289eee>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8157ed12>] int_signal+0x12/0x17 ---[ end trace 476f7270ba7905df ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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