Bug 1284109

Summary: [abrt] WARNING: CPU: 1 PID: 9 at kernel/cgroup_pids.c:97 pids_cancel.constprop.6+0x31/0x40()
Product: [Fedora] Fedora Reporter: Giulio 'juliuxpigface' <juliux.pigface>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: bjwyman, gansalmon, itamar, jonathan, jones.peter.busi, kernel-maint, labbott, madhu.chinakonda, mchehab, nicolas.mailhot
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Unspecified   
URL: https://retrace.fedoraproject.org/faf/reports/bthash/2903c9a9afc5566ce353019467f846ff8207f8b6
Whiteboard: abrt_hash:a178361b7c0d60a8a0eb427a0ddec8d1b89335dc;
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-04-06 17:51:00 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
File: dmesg none

Description Giulio 'juliuxpigface' 2015-11-20 21:38:55 UTC 
Description of problem:
I've found this while checking the output of 'abrt-cli ls'.
I've done a couple of boot on Fedora Rawhide KDE, but I don't know where I've actually encountered this.

Additional info:
reporter:       libreport-2.6.3
WARNING: CPU: 1 PID: 9 at kernel/cgroup_pids.c:97 pids_cancel.constprop.6+0x31/0x40()
Modules linked in: snd_hda_codec_generic ppdev snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm virtio_balloon joydev snd_timer snd soundcore i2c_piix4 acpi_cpufreq parport_pc tpm_tis parport tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc xfs libcrc32c virtio_net virtio_blk virtio_console qxl drm_kms_helper ttm serio_raw drm virtio_pci virtio_ring virtio ata_generic pata_acpi
CPU: 1 PID: 9 Comm: rcuos/0 Not tainted 4.4.0-0.rc1.git2.1.fc24.x86_64 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150318_183358- 04/01/2014
 0000000000000000 0000000098f81d3f ffff88007c503cb8 ffffffff814253a9
 0000000000000000 ffff88007c503cf0 ffffffff810ab5c2 ffff88007a53af00
 ffff880079787e00 ffff880079787e00 ffff880079789000 ffff880074767128
Call Trace:
 [<ffffffff814253a9>] dump_stack+0x4b/0x72
 [<ffffffff810ab5c2>] warn_slowpath_common+0x82/0xc0
 [<ffffffff810ab70a>] warn_slowpath_null+0x1a/0x20
 [<ffffffff81164851>] pids_cancel.constprop.6+0x31/0x40
 [<ffffffff81164acd>] pids_free+0x3d/0xa0
 [<ffffffff81162f23>] cgroup_free+0x53/0xe0
 [<ffffffff810a8112>] __put_task_struct+0x42/0x140
 [<ffffffff810acdd2>] delayed_put_task_struct+0xa2/0x110
 [<ffffffff810acd30>] ? child_wait_callback+0x60/0x60
 [<ffffffff811290a6>] rcu_nocb_kthread+0x226/0x5e0
 [<ffffffff81128ff4>] ? rcu_nocb_kthread+0x174/0x5e0
 [<ffffffff810fa590>] ? wake_atomic_t_function+0x70/0x70
 [<ffffffff81128e80>] ? rcu_cpu_notify+0x470/0x470
 [<ffffffff810d0d31>] kthread+0x101/0x120
 [<ffffffff811063d9>] ? trace_hardirqs_on_caller+0x129/0x1b0
 [<ffffffff810d0c30>] ? kthread_create_on_node+0x250/0x250
 [<ffffffff818743df>] ret_from_fork+0x3f/0x70
 [<ffffffff810d0c30>] ? kthread_create_on_node+0x250/0x250
Comment 1 Giulio 'juliuxpigface' 2015-11-20 21:39:04 UTC 
Created attachment 1097340 [details]
File: dmesg
Comment 2 Josh Boyer 2015-11-30 13:43:34 UTC 
*** Bug 1286530 has been marked as a duplicate of this bug. ***
Comment 3 Laura Abbott 2018-04-06 17:51:00 UTC 
Doing some pruning, this bug looks to be years old. Please test on a newer kernel and reopen if the problem still exists.