[Qemu-devel] [Bug 1719339] [NEW] serial8250: too much work for irq3

[Qemu-devel] [Bug 1719339] [NEW] serial8250: too much work for irq3

[Denys Zagorui]

Public bug reported:

It's know issue and sometimes mentioned since 2007. But it seems not
fixed.

http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
https://bugzilla.redhat.com/show_bug.cgi?id=986761
http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

I don't think fixes like increases PASS_LIMIT
(/drivers/tty/serial/8250.c) or remove this annoying message
(https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix was
proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
if we write a lot of message into console (dmesg or dd if=/dev/zero
of=/dev/ttyS1).

/usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on -S
-object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
/master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
core=off -cpu Skylake-
Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
-m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
-nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
-no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1
-boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x8.0x7
-drive file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id
=drive-ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
-chardev
socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
-device isa-serial,chardev=charserial0,id=serial0 -chardev
socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
-device isa-serial,chardev=charserial1,id=serial1 -device virtio-
balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Denys Zagorui]

Use simpler setup for reproducing. 
Was used only qemu-system-x86_64 (without using high-level wrappers and managers of virtual machines: libvirt, virsh, virt-install, virt-manager etc..). My setup with two consoles:

/usr/local/bin/qemu-system-x86_64 -cpu host -enable-kvm -m 256 -smp 4
-kernel /home/dzagorui//bzImage -append 'root=/dev/ram0 loglevel=9 rw
console=ttyS0' -initrd /home/dzagorui/initrd.cpio -display none -chardev
socket,id=charserial0,host=127.0.0.1,port=4002,telnet,server,nowait
-device isa-serial,chardev=charserial0,id=serial0 -chardev
socket,id=charserial1,host=127.0.0.1,port=4003,telnet,server,nowait
-device isa-serial,chardev=charserial1,id=serial1

I noticed one thing, that -smp parameter affects this issue. When -smp 1 i can't reproduce this issue at all, when -smp 2 i can produce this issue only in second console (ttyS1), when -smp 4 and higher the issue produces on both consoles (ttyS1/ttyS0).
My Host cpu i5-6200U has 2 cores and 4 threads.

For reproducing was used this commands (no matter what console we use ttyS1 or ttyS0):
#dmesg > /dev/ttyS*
#dd if=/dev/zero of=/dev/ttyS*

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Denys Zagorui]

** Changed in: qemu
     Assignee: (unassigned) => Denys Zagorui (dzagorui)

** Changed in: qemu
       Status: New => In Progress

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  In Progress

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Denys Zagorui]

** Changed in: qemu
     Assignee: Denys Zagorui (dzagorui) => (unassigned)

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  In Progress

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Denys Zagorui]

** Changed in: qemu
       Status: In Progress => New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Paul Gear]

I'm seeing this on AWS EC2 when there's (apparently) high logging volume
to the console, very similarly to
https://www.reddit.com/r/sysadmin/comments/6zuqad/mongodb_aws_ec2_serial8250_too_much_work_for_irq4/

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Paul Gear]

** Tags added: canonical-is

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Paul Gear]

On further investigation of my instance, there appeared to be no high
logging volume to the console, nor anything using the /dev/ttyS0 other
than agetty.  Switching from the generic kernel to the AWS kernel seems
to have stabilised it.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3

[Paul Gear]

Further update: AWS kernel experienced the same error messages after
just over 3 hours of runtime.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  New

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Bug 1719339] Re: serial8250: too much work for irq3

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state back to "New" within the next 60 days, otherwise this report will be marked as "Expired". Or mark it as "Fix Released" if the problem has been solved with a newer version of QEMU already. Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  Incomplete

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions

[Bug 1719339] Re: serial8250: too much work for irq3

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1719339

Title:
  serial8250: too much work for irq3

Status in QEMU:
  Expired

Bug description:
  It's know issue and sometimes mentioned since 2007. But it seems not
  fixed.

  http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html
  https://bugzilla.redhat.com/show_bug.cgi?id=986761
  http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.html

  I don't think fixes like increases PASS_LIMIT
  (/drivers/tty/serial/8250.c) or remove this annoying message
  (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix
  was proposed by H. Peter Anvin  https://lkml.org/lkml/2008/2/7/485.

  Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu
  16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master
  branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty))
  if we write a lot of message into console (dmesg or dd if=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions