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Bug#877338: marked as done (linux-image-4.11.0-0.bpo.1-rt-amd64: Warning loop in unpin_current_cpu)

Your message dated Sat, 16 Oct 2021 05:46:11 -0700 (PDT)
with message-id <616ac993.1c69fb81.48560.7c16@mx.google.com>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #877338,
regarding linux-image-4.11.0-0.bpo.1-rt-amd64: Warning loop in unpin_current_cpu
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
877338: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877338
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 4.11.6-1~bpo9+1
Severity: important


RT kernel ran into warning loop, consuming most of the cpu time
running under KVM/QEMU  1 cpu
I dont know whats happening on the host because I'm just vps user


-- Package-specific info:
** Version:
Linux version 4.11.0-0.bpo.1-rt-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18) ) #1 SMP PREEMPT RT Debian 4.11.6-1~bpo9+1 (2017-07-09)

** Command line:
BOOT_IMAGE=/vmlinuz-4.11.0-0.bpo.1-rt-amd64 root=/dev/mapper/main--vg-root ro net.ifnames=0 biosdevname=0 cpu0_hotplug=0

** Tainted: O (4096)
 * Out-of-tree module has been loaded.

** Kernel log:
[10220.468495] CPU: 0 PID: 1992 Comm: systemd-journal Tainted: G        W  O    4.11.0-0.bpo.1-rt-amd64 #1 Debian 4.11.6-1~bpo9+1
[10220.468496] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
[10220.468496] Call Trace:
[10220.468497]  ? dump_stack+0x5c/0x81
[10220.468499]  ? __warn+0xd7/0xf0
[10220.468500]  ? unpin_current_cpu+0x5c/0x70
[10220.468502]  ? migrate_enable+0x1cf/0x310
[10220.468503]  ? migrate_disable+0xbe/0x130
[10220.468505]  ? ep_scan_ready_list.constprop.14+0x24f/0x270
[10220.468506]  ? unpin_current_cpu+0x5c/0x70
[10220.468508]  ? ep_poll+0x1c8/0x430
[10220.468509]  ? devkmsg_read+0x1b4/0x450
[10220.468512]  ? SyS_epoll_wait+0xc1/0xe0
[10220.468513]  ? do_syscall_64+0x7c/0xf0
[10220.468515]  ? entry_SYSCALL64_slow_path+0x25/0x25
[10220.468516] ---[ end trace 0000000000f41235 ]---
[10220.468529] ------------[ cut here ]------------
[10220.468531] WARNING: CPU: 0 PID: 1992 at /build/linux-hoqvEn/linux-4.11.6/debian/build/source_rt/kernel/cpu.c:341 unpin_current_cpu+0x5c/0x70
[10220.468531] Modules linked in: xt_nat ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 xt_TCPMSS ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_tcpudp ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_filter wireguard(O) ip6_udp_tunnel udp_tunnel sit tunnel4 ip_tunnel hid_generic ppdev bochs_drm ttm drm_kms_helper usbhid pcspkr hid serio_raw drm shpchp virtio_balloon evdev parport button ip_tables x_tables autofs4 ext4 crc16 jbd2 crc32c_generic fscrypto ecb crypto_simd cryptd glue_helper aes_x86_64 mbcache dm_mod virtio_blk uhci_hcd ehci_hcd e1000 virtio_pci virtio_ring virtio usbcore usb_common i2c_piix4 [last unloaded: joydev]
[10220.468544] CPU: 0 PID: 1992 Comm: systemd-journal Tainted: G        W  O    4.11.0-0.bpo.1-rt-amd64 #1 Debian 4.11.6-1~bpo9+1
[10220.468545] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
[10220.468545] Call Trace:
[10220.468547]  ? dump_stack+0x5c/0x81
[10220.468549]  ? __warn+0xd7/0xf0
[10220.468550]  ? unpin_current_cpu+0x5c/0x70
[10220.468552]  ? migrate_enable+0x1cf/0x310
[10220.468553]  ? migrate_disable+0xbe/0x130
[10220.468555]  ? ep_poll+0x19f/0x430
[10220.468556]  ? devkmsg_read+0x1b4/0x450
[10220.468559]  ? SyS_epoll_wait+0xc1/0xe0
[10220.468560]  ? do_syscall_64+0x7c/0xf0
[10220.468562]  ? entry_SYSCALL64_slow_path+0x25/0x25
[10220.468563] ---[ end trace 0000000000f41236 ]---


** Model information
sys_vendor: QEMU
product_name: Standard PC (i440FX + PIIX, 1996)
product_version: pc-i440fx-2.9
chassis_vendor: QEMU
chassis_version: pc-i440fx-2.9
bios_vendor: SeaBIOS
bios_version: rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org

** Loaded modules:
xt_nat
ipt_REJECT
nf_reject_ipv4
ip6t_REJECT
nf_reject_ipv6
xt_TCPMSS
ipt_MASQUERADE
nf_nat_masquerade_ipv4
xt_tcpudp
ip6table_filter
ip6_tables
iptable_nat
nf_conntrack_ipv4
nf_defrag_ipv4
nf_nat_ipv4
nf_nat
nf_conntrack
libcrc32c
iptable_filter
wireguard(O)
ip6_udp_tunnel
udp_tunnel
sit
tunnel4
ip_tunnel
joydev
hid_generic
ppdev
usbhid
hid
evdev
bochs_drm
serio_raw
ttm
drm_kms_helper
pcspkr
shpchp
drm
virtio_balloon
parport_pc
parport
button
ip_tables
x_tables
autofs4
ext4
crc16
jbd2
crc32c_generic
fscrypto
ecb
crypto_simd
cryptd
glue_helper
aes_x86_64
mbcache
dm_mod
virtio_blk
uhci_hcd
ehci_hcd
e1000
virtio_pci
virtio_ring
virtio
i2c_piix4
usbcore
usb_common

** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
	Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
	Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
	Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
	Region 4: I/O ports at c0c0 [size=16]
	Kernel modules: ata_piix, ata_generic

00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
	Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 11
	Region 4: I/O ports at c080 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci_hcd

00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 03)
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 9
	Kernel driver in use: piix4_smbus
	Kernel modules: i2c_piix4

00:02.0 VGA compatible controller [0300]: Device [1234:1111] (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Red Hat, Inc Device [1af4:1100]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Region 0: Memory at fd000000 (32-bit, prefetchable) [size=16M]
	Region 2: Memory at fea70000 (32-bit, non-prefetchable) [size=4K]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Kernel driver in use: bochs-drm
	Kernel modules: bochs_drm

00:03.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon [1af4:1002]
	Subsystem: Red Hat, Inc Virtio memory balloon [1af4:0005]
	Physical Slot: 3
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at c0a0 [size=32]
	Region 4: Memory at fe000000 (64-bit, prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: virtio-pci
	Kernel modules: virtio_pci

00:0a.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device [1af4:1001]
	Subsystem: Red Hat, Inc Virtio block device [1af4:0002]
	Physical Slot: 10
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at c000 [size=64]
	Region 1: Memory at fea71000 (32-bit, non-prefetchable) [size=4K]
	Region 4: Memory at fe004000 (64-bit, prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: virtio-pci
	Kernel modules: virtio_pci

00:12.0 Ethernet controller [0200]: Intel Corporation 82540EM Gigabit Ethernet Controller [8086:100e] (rev 03)
	Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
	Physical Slot: 18
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at fea40000 (32-bit, non-prefetchable) [size=128K]
	Region 1: I/O ports at c040 [size=64]
	Expansion ROM at fea00000 [disabled] [size=256K]
	Kernel driver in use: e1000
	Kernel modules: e1000

00:1e.0 PCI bridge [0604]: Red Hat, Inc. QEMU PCI-PCI bridge [1b36:0001] (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel modules: shpchp

00:1f.0 PCI bridge [0604]: Red Hat, Inc. QEMU PCI-PCI bridge [1b36:0001] (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel modules: shpchp


** USB devices:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub


-- System Information:
Debian Release: 9.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.11.0-0.bpo.1-rt-amd64 (SMP w/1 CPU core; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-image-4.11.0-0.bpo.1-rt-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.130
ii  kmod                                    23-2
ii  linux-base                              4.5

Versions of packages linux-image-4.11.0-0.bpo.1-rt-amd64 recommends:
pn  firmware-linux-free  <none>
pn  irqbalance           <none>

Versions of packages linux-image-4.11.0-0.bpo.1-rt-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  grub-pc                 2.02~beta3-5
pn  linux-doc-4.11          <none>

Versions of packages linux-image-4.11.0-0.bpo.1-rt-amd64 is related to:
pn  firmware-amd-graphics     <none>
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
pn  firmware-brcm80211        <none>
pn  firmware-cavium           <none>
pn  firmware-intel-sound      <none>
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
pn  firmware-iwlwifi          <none>
pn  firmware-libertas         <none>
pn  firmware-linux-nonfree    <none>
pn  firmware-misc-nonfree     <none>
pn  firmware-myricom          <none>
pn  firmware-netxen           <none>
pn  firmware-qlogic           <none>
pn  firmware-realtek          <none>
pn  firmware-samsung          <none>
pn  firmware-siano            <none>
pn  firmware-ti-connectivity  <none>
pn  xen-hypervisor            <none>

-- no debconf information

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a very old kernel or the bug is old itself
without resolution.

If you can reproduce it with

- the current version in unstable/testing
- the latest kernel from backports

please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Regards,
Salvatore

--- End Message ---
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