Linux 4.20 released

@philm mentioned in the update thread, that there might be problems with some AMD hardware, because of the new firmware/amd-ucode update.

4.20.0 has just let me down, with UT of a lousy 1d4h. For me it's therefore been no happier than 4.19.5+, with the usual symptoms:

Individual open pgms progressively began partially malfunctioning then completely not responding; couldn't kill them in Firejail; couldn't logout; couldn't change to TTY... but at least REISUB worked. The full-freeze timestamp was 11:13:03, but the wonkiness began several minutes prior.

Summary
[kdemeoz@GA-Z97-HD3-Tower ~]$ sudo journalctl -b -1 | grep kernel
Dec 28 11:01:16 GA-Z97-HD3-Tower kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
Dec 28 11:01:16 GA-Z97-HD3-Tower kernel: rcu:         Tasks blocked on level-0 rcu_node (CPUs 0-7): P10582
Dec 28 11:01:16 GA-Z97-HD3-Tower kernel: rcu:         (detected by 7, t=18002 jiffies, g=16536037, q=908637)
Dec 28 11:04:16 GA-Z97-HD3-Tower kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
Dec 28 11:04:16 GA-Z97-HD3-Tower kernel: rcu:         Tasks blocked on level-0 rcu_node (CPUs 0-7): P10582
Dec 28 11:04:16 GA-Z97-HD3-Tower kernel: rcu:         (detected by 4, t=72007 jiffies, g=16536037, q=1800529)
Dec 28 11:07:16 GA-Z97-HD3-Tower kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
Dec 28 11:07:16 GA-Z97-HD3-Tower kernel: rcu:         Tasks blocked on level-0 rcu_node (CPUs 0-7): P10582
Dec 28 11:07:16 GA-Z97-HD3-Tower kernel: rcu:         (detected by 4, t=126012 jiffies, g=16536037, q=2423729)
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: BUG: Bad page state in process sh  pfn:1df89a
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: page:fffff31ec77e2680 count:0 mapcount:0 mapping:0400000000000000 index:0x0
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: flags: 0xaffff0000000000()
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: raw: 0affff0000000000 dead000000000100 dead000000000200 0400000000000000
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: page dumped because: non-NULL mapping
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: BUG: Bad page state in process ksysguard  pfn:1df8b0
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: page:fffff31ec77e2c00 count:0 mapcount:0 mapping:0000000000000000 index:0x0
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: flags: 0x2ffff0000000000()
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: raw: 02ffff0000000000 dead000000000100 dead000000000200 0000000000000000
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: raw: 0000000000000000 0000000000000000 00000000ffffffff 0200000000000000
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: page dumped because: page still charged to cgroup
Dec 28 11:07:58 GA-Z97-HD3-Tower kernel: page->mem_cgroup:0200000000000000
Dec 28 11:10:16 GA-Z97-HD3-Tower kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
Dec 28 11:10:16 GA-Z97-HD3-Tower kernel: rcu:         Tasks blocked on level-0 rcu_node (CPUs 0-7): P10582
Dec 28 11:10:16 GA-Z97-HD3-Tower kernel: rcu:         (detected by 6, t=180017 jiffies, g=16536037, q=3016715)
Dec 28 11:13:16 GA-Z97-HD3-Tower kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
Dec 28 11:13:16 GA-Z97-HD3-Tower kernel: rcu:         Tasks blocked on level-0 rcu_node (CPUs 0-7): P10582
Dec 28 11:13:16 GA-Z97-HD3-Tower kernel: rcu:         (detected by 5, t=234024 jiffies, g=16536037, q=3236869)
[kdemeoz@GA-Z97-HD3-Tower ~]$ 

Sob.

PS - I have Intel, not AMD.

fwiw ........ :roll_eyes: Both Intel i5
I just installed 420 on an old lap top:
$ inxi -MC Machine: Type: Laptop System: Dell product: Latitude E6410 v: 0001 serial: <root required> Mobo: Dell model: 0667CC v: A01 serial: <root required> BIOS: Dell v: A05 date: 08/10/2010 CPU: Topology: Dual Core model: Intel Core i5 M 520 bits: 64 type: MT MCP L2 cache: 3072 KiB Speed: 1472 MHz min/max: 1199/2400 MHz Core speeds (MHz): 1: 1479 2: 1495 3: 1489 4: 1468
seems to work fine.
I've been running on my desktop nearly a week, no problem:

$ inxi -MC
Machine:   Type: Desktop System: Dell product: Inspiron 3847 v: N/A serial: <root required> 
           Mobo: Dell model: 088DT1 v: A00 serial: <root required> BIOS: Dell v: A02 date: 12/03/2013 
CPU:       Topology: Quad Core model: Intel Core i5-4440 bits: 64 type: MCP L2 cache: 6144 KiB 
           Speed: 798 MHz min/max: 800/3300 MHz Core speeds (MHz): 1: 798 2: 798 3: 798 4: 798 
Slight newer. 

:smile:

Can you be more specific? I don't notice any difference in performance between 4.19 and 4.20. SSD or HDD? Which scheduler? Wireless or wired? Graphics card?

No problems here

System:    Host: hoflo Kernel: 4.20.0-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.14.4 Distro: Manjaro Linux 
Machine:   Type: Desktop System: LENOVO product: 7307A1G v: ThinkCentre M58e serial: <filter> 
           Mobo: LENOVO model: N/A serial: <filter> BIOS: LENOVO v: 5HKT43AUS date: 09/07/2009 
CPU:       Topology: Dual Core model: Intel Core2 Duo E8400 bits: 64 type: MCP L2 cache: 6144 KiB 
           Speed: 2182 MHz min/max: 2003/3003 MHz Core speeds (MHz): 1: 2451 2: 2490 
Graphics:  Device-1: Intel 4 Series Integrated Graphics driver: i915 v: kernel 
           Display: x11 server: X.Org 1.20.3 driver: intel resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa DRI Intel G41 v: 2.1 Mesa 18.2.6 
Audio:     Device-1: Intel NM10/ICH7 Family High Definition Audio driver: snd_hda_intel 
           Sound Server: ALSA v: k4.20.0-1-MANJARO 
Network:   Device-1: Marvell 88E8057 PCI-E Gigabit Ethernet driver: sky2 
           IF: ens33 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 232.89 GiB used: 15.56 GiB (6.7%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 850 EVO 250GB size: 232.89 GiB 
Partition: ID-1: / size: 220.81 GiB used: 15.56 GiB (7.0%) fs: ext4 dev: /dev/sda1 
           ID-2: swap-1 size: 8.43 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda2 
Sensors:   System Temperatures: cpu: 40.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 159 Uptime: 26m Memory: 3.82 GiB used: 1.22 GiB (32.0%) Shell: bash inxi: 3.0.28 

regards
caho

I dont want to make this a support thread :wink:

more specific

SSD for f2fs (SSD 860 EVO)
HDD for XFS (ST500LT012-1DG142)

Whatever is default on Manjaros 4.19 and 4.20 kernels

Wired only

AMD Radeon R9 380


➜ inxi -Fxzc0
System:    Host: balder Kernel: 4.20.0-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: Gnome 3.30.2 
           Distro: Manjaro Linux 
Machine:   Type: Desktop System: Gigabyte product: AB350M-Gaming 3 v: N/A serial: <filter> 
           Mobo: Gigabyte model: AB350M-Gaming 3-CF v: x.x serial: <filter> UEFI: American Megatrends v: F24c date: 12/06/2018 
CPU:       Topology: 8-Core model: AMD Ryzen 7 1700 bits: 64 type: MT MCP arch: Zen rev: 1 L2 cache: 4096 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 95860 
           Speed: 1337 MHz min/max: 1550/3000 MHz Core speeds (MHz): 1: 1357 2: 1274 3: 2369 4: 2327 5: 2246 6: 2252 7: 2074 
           8: 1986 9: 3376 10: 2853 11: 1313 12: 1276 13: 2131 14: 2142 15: 1347 16: 1346 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Tonga PRO [Radeon R9 285/380] vendor: PC Partner Limited driver: amdgpu 
           v: kernel bus ID: 06:00.0 
           Display: wayland server: X.org 1.20.3 driver: amdgpu resolution: <xdpyinfo missing> 
           OpenGL: renderer: AMD Radeon R9 380 Series (TONGA DRM 3.27.0 4.20.0-1-MANJARO LLVM 7.0.0) v: 4.5 Mesa 18.3.1 
           direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Tonga HDMI Audio [Radeon R9 285/380] vendor: PC Partner Limited 
           driver: snd_hda_intel v: kernel bus ID: 06:00.1 
           Device-2: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Gigabyte driver: snd_hda_intel v: kernel 
           bus ID: 08:00.3 
           Device-3: Logitech HD Webcam C525 type: USB driver: snd-usb-audio,uvcvideo bus ID: 1-5:3 
           Sound Server: ALSA v: k4.20.0-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Gigabyte driver: r8169 v: kernel 
           port: f000 bus ID: 03:00.0 
           IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel Wireless 7260 driver: iwlwifi v: kernel port: f000 bus ID: 04:00.0 
           IF: wlp4s0 state: down mac: <filter> 
Drives:    Local Storage: total: 1.14 TiB used: 272.46 GiB (23.3%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 860 EVO 500GB @ size: 465.76 GiB 
           ID-2: /dev/sdb vendor: Seagate model: ST500LT012-1DG142 size: 465.76 GiB 
           ID-3: /dev/sdc vendor: Crucial model: CT256M550SSD1 @ size: 238.47 GiB 
Partition: ID-1: / size: 50.00 GiB used: 29.40 GiB (58.8%) fs: f2fs dev: /dev/sda2 
           ID-2: /boot size: 499.0 MiB used: 190.3 MiB (38.1%) fs: vfat dev: /dev/sda1 
           ID-3: /home size: 415.00 GiB used: 90.83 GiB (21.9%) fs: f2fs dev: /dev/sda3 
Sensors:   System Temperatures: cpu: 35.8 C mobo: 26.0 C gpu: amdgpu temp: 43 C 
           Fan Speeds (RPM): cpu: 0 fan-1: 0 fan-3: 0 gpu: amdgpu fan: 962 
           Voltages: 12v: N/A 5v: N/A 3.3v: 1.67 vbat: 1.59 
Info:      Processes: 355 Uptime: 12m Memory: 15.68 GiB used: 3.17 GiB (20.2%) Init: systemd Compilers: gcc: 8.2.1 Shell: zsh  v: 5.6.2 inxi: 3.0.28 

At the very least people with similar setups and hardware can verify your findings.

1 Like

After inastall Kernel 4.20 my lan internet speed go from 100 mib/s to 10-15mib/s,
On wifi was good.
I think that is some driver problem....
Model: "Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller"
On kernel 4.19 everithing ok.
Greetings

When playing a Youtube video using kernel 4.20 the CPU score went up to 90-95% with a stuttering video. Now I'm back on 4.19 and although the score is still around 50% with the same video it now runs smoothly.
Cause of this was systemd with 70+%
image

Installed the 4.20 kernel yesterday, and no problems so far, everything's running good as it should be :slight_smile:

Installed the 4.20 kernel as soon as it was possible and everything is working fine, I don't think that there is actual diffrence in performance, but systemd-analyze decreased slightly

After testing for a few weeks, I can confirm this also on ext4 and ntfs. On my hdd's, disk I/O is 10-15% worse on 4.20. While transferring files between a ext4 and ntfs partition on separate drives, transfers on 4.14 and 4.19 average 110-115 MB/s (as reported by midnight commander), on 4.20 it is 90-100 MB/s.

Only after turning off all spectre/meltdown mitigations is fs performance improved.

1 Like

On Arch Linux now, there is no noticeable difference between 4.20 and 4.19.
Still the same configuration and layout as it was on Manjaro. :thinking:

1 Like

Manjaro is using different build options from Arch?

and a lot if patches for different functions.

dont know what the reason could be. :confused:

I've been using the 4.20 kernel since it was release for Manjaro and havn't had any issues with on my desktop and laptop. My dad having had this strange issue of no icons on the Desktop.

It might be fs related during boot. Does dad have a hdd? Something blk-mq related maybe. I don't use it on my hdd boot system for similar issue (no desktop icon previews on boot).

This is same link.

Yes he is using a HDD instead of an SSD, never would have thought that could be a HDD issue. Thanks

fixed :joy:

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