Bug 768627

Summary: [abrt] kernel: WARNING: at kernel/trace/trace.c:2812 tracing_ctrl_write+0x110/0x120()
Product: [Fedora] Fedora Reporter: Ferry Huberts <mailings>
Component: latencytopAssignee: Michal Schmidt <mschmidt>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 16CC: gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mschmidt, srostedt, yann
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Unspecified   
Whiteboard: abrt_hash:b7d0eaad72c539e6f83bf85853aa34647eda795a
Fixed In Version: latencytop-0.5-8.fc16 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-03-01 09:26:55 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
File: smolt_data none

Description Ferry Huberts 2011-12-17 12:38:53 UTC 
libreport version: 2.0.7
abrt_version:   2.0.6
cmdline:        BOOT_IMAGE=/vmlinuz-3.1.5-2.fc16.x86_64 root=/dev/mapper/vg_stinkpadw520-lv_root ro rd.lvm.lv=vg_stinkpadw520/lv_swap rd.md=0 rd.dm=0 rd.luks.uuid=luks-29a52a86-a488-4105-81ac-5fa5e777d4d8 rd.lvm.lv=vg_stinkpadw520/lv_root KEYTABLE=us SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 quiet
kernel:         3.1.5-2.fc16.x86_64
reason:         WARNING: at kernel/trace/trace.c:2812 tracing_ctrl_write+0x110/0x120()
time:           za 17 dec 2011 13:33:43 CET

smolt_data:     Text file, 3057 bytes

backtrace:
:WARNING: at kernel/trace/trace.c:2812 tracing_ctrl_write+0x110/0x120()
:Hardware name: 42844MG
:tracing_enabled is deprecated. Use tracing_on
:Modules linked in: vfat fat mmc_block tcp_lp nls_utf8 ppdev parport_pc lp parport fuse ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat xt_CHECKSUM lockd iptable_mangle tun bridge stp llc rfcomm bnep nf_conntrack_ipv4 nf_defrag_ipv4 ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables snd_hda_codec_conexant arc4 cdc_wdm cdc_acm cdc_ncm usbnet mii snd_hda_intel snd_hda_codec joydev snd_hwdep uvcvideo btusb videodev i2c_i801 snd_seq iTCO_wdt media bluetooth v4l2_compat_ioctl32 microcode snd_seq_device iwlagn iTCO_vendor_support thinkpad_acpi snd_pcm mac80211 snd_timer snd cfg80211 soundcore snd_page_alloc e1000e rfkill virtio_net kvm_intel kvm uinput sunrpc xts gf128mul dm_crypt sdhci_pci sdhci firewire_ohci mmc_core firewire_core crc_itu_t wmi i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: scsi_wait_scan]
:Pid: 8530, comm: latencytop Not tainted 3.1.5-2.fc16.x86_64 #1
:Call Trace:
: [<ffffffff8106b6ef>] warn_slowpath_common+0x7f/0xc0
: [<ffffffff8106b7e6>] warn_slowpath_fmt+0x46/0x50
: [<ffffffff810f0890>] tracing_ctrl_write+0x110/0x120
: [<ffffffff811728b3>] vfs_write+0xb3/0x180
: [<ffffffff81172bda>] sys_write+0x4a/0x90
: [<ffffffff815d8bc2>] system_call_fastpath+0x16/0x1b

event_log:
:2011-12-17-13:36:33> Smolt profile successfully saved
:2011-12-17-13:37:44> Submitting oops report to http://submit.kerneloops.org/submitoops.php
:2011-12-17-13:38:47  Kernel oops has not been sent due to Couldn't connect to server
:2011-12-17-13:38:47* (exited with 1)
Comment 1 Ferry Huberts 2011-12-17 12:38:56 UTC 
Created attachment 548195 [details]
File: smolt_data
Comment 2 Steven Rostedt 2011-12-19 18:41:19 UTC 
This warning is caused by the following line:

		/* Only need to warn if this is used to change the state */
		WARN_ONCE(1, "tracing_enabled is deprecated. Use tracing_on");

What used it? A user or a tool. The file /sys/debug/tracing/tracing_enabled is going away. It is much slower than tracing_on and it never did what it was intended to do. I added this warning to find those that are still using it so we can fix those tools and then eventually remove this file.
Comment 3 Dave Jones 2011-12-19 18:45:17 UTC 
ah...

:Pid: 8530, comm: latencytop
Comment 4 Steven Rostedt 2012-02-06 15:37:35 UTC 
Note, Arjan (maintainer of latencytop) knows of this issue and has supposedly fixed the tool to not reference this file.
Comment 5 Dave Jones 2012-02-10 22:57:10 UTC 
*** Bug 789480 has been marked as a duplicate of this bug. ***
Comment 6 Fedora Update System 2012-02-20 08:58:44 UTC 
latencytop-0.5-8.fc16 has been submitted as an update for Fedora 16.
https://admin.fedoraproject.org/updates/latencytop-0.5-8.fc16
Comment 7 Fedora Update System 2012-02-21 01:26:43 UTC 
Package latencytop-0.5-8.fc16:
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing latencytop-0.5-8.fc16'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-2067/latencytop-0.5-8.fc16
then log in and leave karma (feedback).
Comment 8 Fedora Update System 2012-03-01 09:26:55 UTC 
latencytop-0.5-8.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.