kernel October 2014

kernel@lists.fedoraproject.org

24 participants
22 discussions

Re: [kernel/f21] Make sure acpi brightness_switch is disabled (like forever in Fedora)
by Hans de Goede 29 Jul '15

29 Jul '15

Hi Josh, On 07/28/2014 07:04 PM, Josh Boyer wrote: > commit e6fe382d1d53d4cdf9b544729dc823d4eab0217c > Author: Josh Boyer <jwboyer(a)fedoraproject.org> > Date: Mon Jul 28 13:03:01 2014 -0400 > > Make sure acpi brightness_switch is disabled (like forever in Fedora) > > Upstream reverted the change to turn the ACPI brightness_switch_enabled > parameter off by default. Revert the revert so we go back to the state > Fedora has traditionally been in. Ack, I was planning on doing this myself but you beat me to it, thanks for taking care of this. Note that 3.17 will have this patch: https://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=… Which fixes the 2 steps being taken for one keypress problem while keeping the acpi brightness_switch behavior enabled, so that people who have an acpi-video controlled backlight and a userspace which does not do backlight control (e.g. windowmaker). So for 3.17 we should IMHO drop the revert-revert and stick with upstream behavior. Alternatively we could apply that patch now instead of the revert-revert. Regards, Hans

3 7

fedora 14 kernel performance with ip forwarding workload
by Jesse Brandeburg 04 Jun '15

04 Jun '15

The other day I was running the stock fedora kernel on my ip forwarding setup, to see what the performance was, and the performance wasn't very good. system is S5520HC dual socket 2.93GHz Xeon 5570 (Nehalem) with 3 quad port 82580 adapters (12 ports). Traffic is bidirectional 64 byte packets being forwarded and received on each port, basically port to port routing. I am only using 12 flows currently. The driver is igb, and I am using an affinity script that lines up each pair of ports that are forwarding traffic into optimal configurations for cache locality. I am also disabling remote_node_defrag_ratio to stop cross node traffic. With the fedora default kernel from F14 it appears that CONFIG_NETFILTER=y means that I cannot unload all of netfilter even if I stop iptables service. perf showed netfilter being prominent, and removing it gives me much higher throughput. Is there a reason CONFIG_NETFILTER=y ? Isn't it a good thing to be able to disable netfilter if you want to? Jesse

5 9

FYI failed boot with 3.18.0-0.rc1.git1.2
by Bruno Wolff III 03 Nov '14

03 Nov '14

This one is more likely due to something in the initrd than the kernel. The boot got to where dbus was activated and then services started failing. Again I was in a hurrry and just went back to 3.18.0-0.rc0.git9.5 and the system booted normally.

2 4

CVE fixes in kernel-3.16.7-200.fc20
by Reindl Harald 31 Oct '14

31 Oct '14

i wonder if 3.16.7 contains all the 3.16.3 CVE-fixes from https://koji.fedoraproject.org/koji/buildinfo?buildID=587751 and the previous 3.16.6 ones from Fedora because https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.16.7 dont mention them?

2 2

fuse: failed to open /dev/fuse: Permission denied
by Reindl Harald 30 Oct '14

30 Oct '14

am i the only one which can't mount fuse as normal user with 3.16.6-203.fc20.x86_64? ______________________________________________ [harry@rh:~]$ mount /mnt/arrakis fuse: failed to open /dev/fuse: Permission denied [harry@rh:~]$ mount /mnt/mail-gw fuse: failed to open /dev/fuse: Permission denied [harry@rh:~]$ stat /dev/fuse Datei: „/dev/fuse“ Größe: 0 Blöcke: 0 EA Block: 4096 zeichenorientierte Spezialdatei Gerät: 5h/5d Inode: 14891 Verknüpfungen: 1 Gerätetyp: a,e5 Zugriff: (0600/crw-------) Uid: ( 0/ root) Gid: ( 0/ root) Zugriff : 2014-10-30 10:31:37.205256870 +0100 Modifiziert: 2014-10-30 10:31:37.205256870 +0100 Geändert : 2014-10-30 10:31:37.492258405 +0100 Geburt : -

2 2

INFO: task echo:622 blocked for more than 120 seconds. - 3.18.0-0.rc0.git
by poma 30 Oct '14

30 Oct '14

02:00.0 VGA compatible controller: NVIDIA Corporation G98 [GeForce 8400 GS Rev. 2] (rev a1) Chipset: G98 (NV98) Family : NV50 The same for all four kernel: - 3.18.0-0.rc0.git8.1.fc22.x86_64 - 3.18.0-0.rc0.git9.1.fc22.x86_64 - 3.18.0-0.rc0.git9.3.fc22.x86_64 - 3.18.0-0.rc0.git9.4.fc22.x86_64 after "fb: switching to nouveaufb from VESA VGA" display is powered off. The magic SysRq key sequence is necessary to reboot. Yet reached this this one recital: ... [ 5.860996] [drm] Initialized nouveau 1.2.1 20120801 for 0000:02:00.0 on minor 0 ... [ 240.229058] INFO: task echo:622 blocked for more than 120 seconds. [ 240.229594] Not tainted 3.18.0-0.rc0.git9.3.fc22.x86_64 #1 [ 240.230149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.230661] echo D ffff8800c82a3480 12472 622 1 0x00000004 [ 240.231230] ffff8800ca2e3ac8 0000000000000096 ffff8800c82a3480 00000000001d5f00 [ 240.231784] ffff8800ca2e3fd8 00000000001d5f00 ffff880128bf0000 ffff8800c82a3480 [ 240.232344] ffffffff82c30990 7fffffffffffffff ffffffff81ee2698 ffffffff81ee2690 [ 240.232931] Call Trace: [ 240.233467] [<ffffffff8185baf9>] schedule+0x29/0x70 [ 240.234025] [<ffffffff81860d1c>] schedule_timeout+0x26c/0x410 [ 240.234562] [<ffffffff81028c4a>] ? native_sched_clock+0x2a/0xa0 [ 240.235118] [<ffffffff811078bc>] ? mark_held_locks+0x7c/0xb0 [ 240.235645] [<ffffffff81861da0>] ? _raw_spin_unlock_irq+0x30/0x50 [ 240.236198] [<ffffffff81107a4d>] ? trace_hardirqs_on_caller+0x15d/0x200 [ 240.236729] [<ffffffff8185d52c>] wait_for_completion+0x10c/0x150 [ 240.237290] [<ffffffff810e51f0>] ? wake_up_state+0x20/0x20 [ 240.237842] [<ffffffff8112a559>] _rcu_barrier+0x159/0x200 [ 240.238375] [<ffffffff8112a655>] rcu_barrier+0x15/0x20 [ 240.238913] [<ffffffff8171813f>] netdev_run_todo+0x6f/0x310 [ 240.239449] [<ffffffff817251ae>] rtnl_unlock+0xe/0x10 [ 240.239999] [<ffffffff8170ea35>] unregister_netdev+0x25/0x30 [ 240.240546] [<ffffffffa00222d2>] rtl_remove_one+0x62/0x230 [r8169] [ 240.241104] [<ffffffff814682cf>] pci_device_remove+0x3f/0xc0 [ 240.241642] [<ffffffff8155b34f>] __device_release_driver+0x7f/0xf0 [ 240.242180] [<ffffffff8155b3e5>] device_release_driver+0x25/0x40 [ 240.242712] [<ffffffff8146234c>] pci_stop_bus_device+0x9c/0xb0 [ 240.243259] [<ffffffff8146248e>] pci_stop_and_remove_bus_device_locked+0x1e/0x40 [ 240.243785] [<ffffffff8146b44c>] remove_store+0x7c/0x90 [ 240.244321] [<ffffffff81555f98>] dev_attr_store+0x18/0x30 [ 240.244858] [<ffffffff81302789>] sysfs_kf_write+0x49/0x60 [ 240.245375] [<ffffffff81301ac9>] kernfs_fop_write+0xf9/0x180 [ 240.245921] [<ffffffff8127305a>] vfs_write+0xba/0x200 [ 240.246439] [<ffffffff8186379c>] ? retint_swapgs+0x13/0x1b [ 240.246978] [<ffffffff81273bac>] SyS_write+0x5c/0xd0 [ 240.247491] [<ffffffff81862b69>] system_call_fastpath+0x12/0x17 [ 240.248025] 6 locks held by echo/622: [ 240.248532] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff81273143>] vfs_write+0x1a3/0x200 [ 240.249104] #1: (&of->mutex){+.+.+.}, at: [<ffffffff81301a97>] kernfs_fop_write+0xc7/0x180 [ 240.249651] #2: (s_active#131){++++++}, at: [<ffffffff81300ce4>] kernfs_remove_self+0xf4/0x170 [ 240.250229] #3: (pci_rescan_remove_lock){+.+.+.}, at: [<ffffffff8145f167>] pci_lock_rescan_remove+0x17/0x20 [ 240.250779] #4: (&dev->mutex){......}, at: [<ffffffff8155b3dd>] device_release_driver+0x1d/0x40 [ 240.251358] #5: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 241.303095] systemd[1]: start request repeated too quickly for lightdm.service [ 241.323052] systemd[1]: Unit lightdm.service entered failed state. [ 241.333101] systemd[1]: lightdm.service failed. [ 359.038325] INFO: task kworker/u16:2:81 blocked for more than 120 seconds. [ 359.039475] Not tainted 3.18.0-0.rc0.git9.3.fc22.x86_64 #1 [ 359.040004] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 359.040571] kworker/u16:2 D ffff880128131a40 10896 81 2 0x00000000 [ 359.041162] Workqueue: netns cleanup_net [ 359.041701] ffff8801275bba88 0000000000000096 ffff880128131a40 00000000001d5f00 [ 359.042280] ffff8801275bbfd8 00000000001d5f00 ffff880128bf3480 ffff880128131a40 [ 359.042856] ffff880128131a40 ffffffff81ee25e8 0000000000000246 ffff880128131a40 [ 359.043436] Call Trace: [ 359.043975] [<ffffffff8185c0a1>] schedule_preempt_disabled+0x31/0x80 [ 359.044542] [<ffffffff8185d8f3>] mutex_lock_nested+0x183/0x440 [ 359.045108] [<ffffffff8112a435>] ? _rcu_barrier+0x35/0x200 [ 359.045647] [<ffffffff81028c4a>] ? native_sched_clock+0x2a/0xa0 [ 359.046218] [<ffffffff8112a435>] ? _rcu_barrier+0x35/0x200 [ 359.046767] [<ffffffff8185f914>] ? __mutex_unlock_slowpath+0xc4/0x1c0 [ 359.047333] [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 359.047875] [<ffffffff8112a655>] rcu_barrier+0x15/0x20 [ 359.048433] [<ffffffff8171813f>] netdev_run_todo+0x6f/0x310 [ 359.048969] [<ffffffff8170cd35>] ? rollback_registered_many+0x265/0x2e0 [ 359.049528] [<ffffffff817251ae>] rtnl_unlock+0xe/0x10 [ 359.050062] [<ffffffff8170eb96>] default_device_exit_batch+0x156/0x180 [ 359.050624] [<ffffffff810fd6b0>] ? abort_exclusive_wait+0xb0/0xb0 [ 359.051185] [<ffffffff81706c43>] ops_exit_list.isra.1+0x53/0x60 [ 359.051720] [<ffffffff817077f0>] cleanup_net+0x100/0x1f0 [ 359.052271] [<ffffffff810ccdb8>] process_one_work+0x218/0x850 [ 359.052806] [<ffffffff810ccd1f>] ? process_one_work+0x17f/0x850 [ 359.053356] [<ffffffff810cd4d7>] ? worker_thread+0xe7/0x4a0 [ 359.053891] [<ffffffff810cd45b>] worker_thread+0x6b/0x4a0 [ 359.054444] [<ffffffff810cd3f0>] ? process_one_work+0x850/0x850 [ 359.054977] [<ffffffff810d37ab>] kthread+0x10b/0x130 [ 359.055521] [<ffffffff81028cc9>] ? sched_clock+0x9/0x10 [ 359.056054] [<ffffffff810d36a0>] ? kthread_create_on_node+0x250/0x250 [ 359.056600] [<ffffffff81862abc>] ret_from_fork+0x7c/0xb0 [ 359.057145] [<ffffffff810d36a0>] ? kthread_create_on_node+0x250/0x250 [ 359.057668] 4 locks held by kworker/u16:2/81: [ 359.058212] #0: ("%s""netns"){.+.+.+}, at: [<ffffffff810ccd1f>] process_one_work+0x17f/0x850 [ 359.058784] #1: (net_cleanup_work){+.+.+.}, at: [<ffffffff810ccd1f>] process_one_work+0x17f/0x850 [ 359.059376] #2: (net_mutex){+.+.+.}, at: [<ffffffff8170777c>] cleanup_net+0x8c/0x1f0 [ 359.059949] #3: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 359.060566] INFO: task echo:622 blocked for more than 120 seconds. [ 359.061131] Not tainted 3.18.0-0.rc0.git9.3.fc22.x86_64 #1 [ 359.061666] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 359.062218] echo D ffff8800c82a3480 12472 622 1 0x00000004 [ 359.062783] ffff8800ca2e3ac8 0000000000000096 ffff8800c82a3480 00000000001d5f00 [ 359.063365] ffff8800ca2e3fd8 00000000001d5f00 ffff880128bf0000 ffff8800c82a3480 [ 359.063915] ffffffff82c30990 7fffffffffffffff ffffffff81ee2698 ffffffff81ee2690 [ 359.064499] Call Trace: [ 359.065029] [<ffffffff8185baf9>] schedule+0x29/0x70 [ 359.065590] [<ffffffff81860d1c>] schedule_timeout+0x26c/0x410 [ 359.066141] [<ffffffff81028c4a>] ? native_sched_clock+0x2a/0xa0 [ 359.066664] [<ffffffff811078bc>] ? mark_held_locks+0x7c/0xb0 [ 359.067208] [<ffffffff81861da0>] ? _raw_spin_unlock_irq+0x30/0x50 [ 359.067723] [<ffffffff81107a4d>] ? trace_hardirqs_on_caller+0x15d/0x200 [ 359.068265] [<ffffffff8185d52c>] wait_for_completion+0x10c/0x150 [ 359.068789] [<ffffffff810e51f0>] ? wake_up_state+0x20/0x20 [ 359.069334] [<ffffffff8112a559>] _rcu_barrier+0x159/0x200 [ 359.069846] [<ffffffff8112a655>] rcu_barrier+0x15/0x20 [ 359.070378] [<ffffffff8171813f>] netdev_run_todo+0x6f/0x310 [ 359.070890] [<ffffffff817251ae>] rtnl_unlock+0xe/0x10 [ 359.071417] [<ffffffff8170ea35>] unregister_netdev+0x25/0x30 [ 359.071951] [<ffffffffa00222d2>] rtl_remove_one+0x62/0x230 [r8169] [ 359.072499] [<ffffffff814682cf>] pci_device_remove+0x3f/0xc0 [ 359.073015] [<ffffffff8155b34f>] __device_release_driver+0x7f/0xf0 [ 359.073557] [<ffffffff8155b3e5>] device_release_driver+0x25/0x40 [ 359.074067] [<ffffffff8146234c>] pci_stop_bus_device+0x9c/0xb0 [ 359.074602] [<ffffffff8146248e>] pci_stop_and_remove_bus_device_locked+0x1e/0x40 [ 359.075141] [<ffffffff8146b44c>] remove_store+0x7c/0x90 [ 359.075658] [<ffffffff81555f98>] dev_attr_store+0x18/0x30 [ 359.076192] [<ffffffff81302789>] sysfs_kf_write+0x49/0x60 [ 359.076710] [<ffffffff81301ac9>] kernfs_fop_write+0xf9/0x180 [ 359.077249] [<ffffffff8127305a>] vfs_write+0xba/0x200 [ 359.077758] [<ffffffff8186379c>] ? retint_swapgs+0x13/0x1b [ 359.078283] [<ffffffff81273bac>] SyS_write+0x5c/0xd0 [ 359.078796] [<ffffffff81862b69>] system_call_fastpath+0x12/0x17 [ 359.079326] 6 locks held by echo/622: [ 359.079829] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff81273143>] vfs_write+0x1a3/0x200 [ 359.080405] #1: (&of->mutex){+.+.+.}, at: [<ffffffff81301a97>] kernfs_fop_write+0xc7/0x180 [ 359.080957] #2: (s_active#131){++++++}, at: [<ffffffff81300ce4>] kernfs_remove_self+0xf4/0x170 [ 359.081531] #3: (pci_rescan_remove_lock){+.+.+.}, at: [<ffffffff8145f167>] pci_lock_rescan_remove+0x17/0x20 [ 359.082133] #4: (&dev->mutex){......}, at: [<ffffffff8155b3dd>] device_release_driver+0x1d/0x40 [ 359.082699] #5: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 380.911219] systemd-journald[386]: Received request to flush runtime journal from PID 1 [ 383.238185] systemd-journald[386]: Received request to flush runtime journal from PID 1 [ 383.559763] systemd[1]: Unit lightdm.service entered failed state. [ 383.569825] systemd[1]: lightdm.service failed. [ 385.570803] systemd[1]: lightdm.service failed. [ 479.091518] INFO: task kworker/u16:2:81 blocked for more than 120 seconds. [ 479.092050] Not tainted 3.18.0-0.rc0.git9.3.fc22.x86_64 #1 [ 479.092608] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 479.093093] kworker/u16:2 D ffff880128131a40 10896 81 2 0x00000000 [ 479.093650] Workqueue: netns cleanup_net [ 479.094110] ffff8801275bba88 0000000000000096 ffff880128131a40 00000000001d5f00 [ 479.094594] ffff8801275bbfd8 00000000001d5f00 ffff880128bf3480 ffff880128131a40 [ 479.095040] ffff880128131a40 ffffffff81ee25e8 0000000000000246 ffff880128131a40 [ 479.095485] Call Trace: [ 479.095874] [<ffffffff8185c0a1>] schedule_preempt_disabled+0x31/0x80 [ 479.096246] [<ffffffff8185d8f3>] mutex_lock_nested+0x183/0x440 [ 479.096634] [<ffffffff8112a435>] ? _rcu_barrier+0x35/0x200 [ 479.096986] [<ffffffff81028c4a>] ? native_sched_clock+0x2a/0xa0 [ 479.097367] [<ffffffff8112a435>] ? _rcu_barrier+0x35/0x200 [ 479.097712] [<ffffffff8185f914>] ? __mutex_unlock_slowpath+0xc4/0x1c0 [ 479.098061] [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 479.098425] [<ffffffff8112a655>] rcu_barrier+0x15/0x20 [ 479.098771] [<ffffffff8171813f>] netdev_run_todo+0x6f/0x310 [ 479.099109] [<ffffffff8170cd35>] ? rollback_registered_many+0x265/0x2e0 [ 479.099485] [<ffffffff817251ae>] rtnl_unlock+0xe/0x10 [ 479.099828] [<ffffffff8170eb96>] default_device_exit_batch+0x156/0x180 [ 479.100181] [<ffffffff810fd6b0>] ? abort_exclusive_wait+0xb0/0xb0 [ 479.100572] [<ffffffff81706c43>] ops_exit_list.isra.1+0x53/0x60 [ 479.100935] [<ffffffff817077f0>] cleanup_net+0x100/0x1f0 [ 479.101323] [<ffffffff810ccdb8>] process_one_work+0x218/0x850 [ 479.101689] [<ffffffff810ccd1f>] ? process_one_work+0x17f/0x850 [ 479.102039] [<ffffffff810cd4d7>] ? worker_thread+0xe7/0x4a0 [ 479.102420] [<ffffffff810cd45b>] worker_thread+0x6b/0x4a0 [ 479.102773] [<ffffffff810cd3f0>] ? process_one_work+0x850/0x850 [ 479.103138] [<ffffffff810d37ab>] kthread+0x10b/0x130 [ 479.103529] [<ffffffff81028cc9>] ? sched_clock+0x9/0x10 [ 479.103912] [<ffffffff810d36a0>] ? kthread_create_on_node+0x250/0x250 [ 479.104315] [<ffffffff81862abc>] ret_from_fork+0x7c/0xb0 [ 479.104714] [<ffffffff810d36a0>] ? kthread_create_on_node+0x250/0x250 [ 479.105111] 4 locks held by kworker/u16:2/81: [ 479.105543] #0: ("%s""netns"){.+.+.+}, at: [<ffffffff810ccd1f>] process_one_work+0x17f/0x850 [ 479.105997] #1: (net_cleanup_work){+.+.+.}, at: [<ffffffff810ccd1f>] process_one_work+0x17f/0x850 [ 479.106485] #2: (net_mutex){+.+.+.}, at: [<ffffffff8170777c>] cleanup_net+0x8c/0x1f0 [ 479.106966] #3: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 [ 479.107496] INFO: task echo:622 blocked for more than 120 seconds. [ 479.107958] Not tainted 3.18.0-0.rc0.git9.3.fc22.x86_64 #1 [ 479.108450] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 479.108941] echo D ffff8800c82a3480 12472 622 1 0x00000004 [ 479.109494] ffff8800ca2e3ac8 0000000000000096 ffff8800c82a3480 00000000001d5f00 [ 479.110038] ffff8800ca2e3fd8 00000000001d5f00 ffff880128bf0000 ffff8800c82a3480 [ 479.110596] ffffffff82c30990 7fffffffffffffff ffffffff81ee2698 ffffffff81ee2690 [ 479.111143] Call Trace: [ 479.111694] [<ffffffff8185baf9>] schedule+0x29/0x70 [ 479.112236] [<ffffffff81860d1c>] schedule_timeout+0x26c/0x410 [ 479.112786] [<ffffffff81028c4a>] ? native_sched_clock+0x2a/0xa0 [ 479.113331] [<ffffffff811078bc>] ? mark_held_locks+0x7c/0xb0 [ 479.113853] [<ffffffff81861da0>] ? _raw_spin_unlock_irq+0x30/0x50 [ 479.114393] [<ffffffff81107a4d>] ? trace_hardirqs_on_caller+0x15d/0x200 [ 479.114917] [<ffffffff8185d52c>] wait_for_completion+0x10c/0x150 [ 479.115459] [<ffffffff810e51f0>] ? wake_up_state+0x20/0x20 [ 479.115975] [<ffffffff8112a559>] _rcu_barrier+0x159/0x200 [ 479.116510] [<ffffffff8112a655>] rcu_barrier+0x15/0x20 [ 479.117028] [<ffffffff8171813f>] netdev_run_todo+0x6f/0x310 [ 479.117553] [<ffffffff817251ae>] rtnl_unlock+0xe/0x10 [ 479.118067] [<ffffffff8170ea35>] unregister_netdev+0x25/0x30 [ 479.118617] [<ffffffffa00222d2>] rtl_remove_one+0x62/0x230 [r8169] [ 479.119140] [<ffffffff814682cf>] pci_device_remove+0x3f/0xc0 [ 479.119688] [<ffffffff8155b34f>] __device_release_driver+0x7f/0xf0 [ 479.120196] [<ffffffff8155b3e5>] device_release_driver+0x25/0x40 [ 479.120722] [<ffffffff8146234c>] pci_stop_bus_device+0x9c/0xb0 [ 479.121243] [<ffffffff8146248e>] pci_stop_and_remove_bus_device_locked+0x1e/0x40 [ 479.121782] [<ffffffff8146b44c>] remove_store+0x7c/0x90 [ 479.122323] [<ffffffff81555f98>] dev_attr_store+0x18/0x30 [ 479.122838] [<ffffffff81302789>] sysfs_kf_write+0x49/0x60 [ 479.123364] [<ffffffff81301ac9>] kernfs_fop_write+0xf9/0x180 [ 479.123882] [<ffffffff8127305a>] vfs_write+0xba/0x200 [ 479.124416] [<ffffffff8186379c>] ? retint_swapgs+0x13/0x1b [ 479.124928] [<ffffffff81273bac>] SyS_write+0x5c/0xd0 [ 479.125460] [<ffffffff81862b69>] system_call_fastpath+0x12/0x17 [ 479.125968] 6 locks held by echo/622: [ 479.126498] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff81273143>] vfs_write+0x1a3/0x200 [ 479.127054] #1: (&of->mutex){+.+.+.}, at: [<ffffffff81301a97>] kernfs_fop_write+0xc7/0x180 [ 479.127624] #2: (s_active#131){++++++}, at: [<ffffffff81300ce4>] kernfs_remove_self+0xf4/0x170 [ 479.128192] #3: (pci_rescan_remove_lock){+.+.+.}, at: [<ffffffff8145f167>] pci_lock_rescan_remove+0x17/0x20 [ 479.128773] #4: (&dev->mutex){......}, at: [<ffffffff8155b3dd>] device_release_driver+0x1d/0x40 [ 479.129361] #5: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff8112a435>] _rcu_barrier+0x35/0x200 ... Ref. http://koji.fedoraproject.org/koji/packageinfo?packageID=8

3 11

should we consider making CoDel the default to combat bufferbloat?
by Matthew Miller 29 Oct '14

29 Oct '14

Reading https://lwn.net/Articles/616241/, getting myself in happily over my level of actual knowledge about the state of things. >From that article, it seems like it might be worth trying net.core.default_qdisc = fq_codel by default. Just tossing this out there for the consideration of someone who really knows what they're talking about in this area. -- Matthew Miller <mattdm(a)fedoraproject.org> Fedora Project Leader

9 13

Overlayfs in rawhide
by Josh Boyer 27 Oct '14

27 Oct '14

Hi All, A quick FYI for those that don't follow kernel news often. Overlayfs has been merged into the mainline kernel with 3.18-rc2. We've been carrying this in the kernel-playground COPR for a while and it is now enabled in the standard Fedora kernels. Enjoy and report bugs upstream ;). josh

3 2

[PATCH] kernel.spec: enable building of perf with libnuma support
by Petr Holasek 24 Oct '14

24 Oct '14

Patch makes perf package dependent on numactl-devel and so enables numa subsystem benchmarks for perf bench command. numactl-devel is added to the buildroot just for x86 archs, because we don't ship libnuma for any others architectures. Can be easily reproduced by calling 'perf bench numa mem -a': - current output: 'Unknown subsystem:numa' - built with this patch: 'Running numa/mem benchmark...' Signed-off-by: Petr Holasek <pholasek(a)redhat.com> --- kernel.spec | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel.spec b/kernel.spec index 838712d..6a2a04c 100644 --- a/kernel.spec +++ b/kernel.spec @@ -386,6 +386,9 @@ BuildRequires: sparse %if %{with_perf} BuildRequires: elfutils-devel zlib-devel binutils-devel newt-devel python-devel perl(ExtUtils::Embed) bison flex BuildRequires: audit-libs-devel +%ifarch %{ix86} x86_64 +BuildRequires: numactl-devel +%endif %endif %if %{with_tools} BuildRequires: pciutils-devel gettext ncurses-devel @@ -1754,7 +1757,7 @@ BuildKernel %make_target %kernel_image %endif %global perf_make \ - make -s %{?cross_opts} %{?_smp_mflags} -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1 HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1 prefix=%{_prefix} + make -s %{?cross_opts} %{?_smp_mflags} -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1 HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_STRLCPY=1 NO_BIONIC=1 prefix=%{_prefix} %if %{with_perf} # perf %{perf_make} DESTDIR=$RPM_BUILD_ROOT all -- 1.9.3

5 9

FYI: I have seen one rc0.git9 early boot crash
by Bruno Wolff III 17 Oct '14

17 Oct '14

I didn't have time to futz with things further this morning, but one of three machines I tried 3.18.0-0.rc0.git9.2.fc22.1 crashed very early in the boot process. Since I was in a hurry I just tried 3.18.0-0.rc0.git8.2.fc22.1 and it worked. I probably won't get a chance to play with it tonight, but if I can get consistent failures (with whatever the latest version is when I do get time), I'll open a bug.

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kernel October 2014