From: "Piotr Haber" <phaber@broadcom.com>
To: "Steven Rostedt" <rostedt@goodmis.org>,
"Frederic Weisbecker" <fweisbec@gmail.com>,
"Ingo Molnar" <mingo@redhat.com>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: [BUG] ftrace: available_filter_functions empty after unloading module
Date: Thu, 6 Dec 2012 15:56:54 +0100 [thread overview]
Message-ID: <50C0B236.4090200@broadcom.com> (raw)
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 ]---
next reply other threads:[~2012-12-06 14:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-06 14:56 Piotr Haber [this message]
2012-12-06 18:10 ` [BUG] ftrace: available_filter_functions empty after unloading module Steven Rostedt
2012-12-07 8:06 ` Piotr Haber
2012-12-07 13:57 ` Steven Rostedt
2012-12-10 11:45 ` Piotr Haber
2012-12-13 13:34 ` Steven Rostedt
2012-12-13 17:08 ` Steven Rostedt
2012-12-13 19:39 ` Steven Rostedt
2012-12-14 0:05 ` Steven Rostedt
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