[Bug 1861653] [NEW] CPU of qemu-system-aarch64 always stuck

[zwq]

Public bug reported:

I started qemu with these arguments:
 qemu-system-aarch64 -M virt-2.9 -cpu cortex-a72 -smp 
cores=8,threads=1,sockets=1 -m 2G -device nec-usb-xhci -device usb-kbd -device 
usb-tablet -pflash /sdcard/QEMU_EFI.img -pflash /sdcard/QEMU_VARS.img -device 
virtio-blk-device,drive=Ubuntu -drive if=none,id=Ubuntu,file=Ubuntu.vhd 
-nographic -net user -net nic,model=rtl8139 -kernel linux -initrd initrd.gz
The setup program of Ubuntu devel aarch64 ran normally.But after several 
hours,the CPUs emulated by qemu-system-aarch64 went wrong.
Here are the messages displayed on the tty
[15842.164745] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9]                                                                 
        [15930.163589] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9]
[16110.163540] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9] 
[16290.162801] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [ksoftirqd/0:9]
[16470.163927] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9] 
[16650.163246] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9] 
[16830.163216] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9] 
[17010.164504] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [ksoftirqd/0:9]

Then I tried CentOS 7.1908 aarch64 with almost the same arguments.
After several hours,it went wrong too.
[17480 . 201 1 58] rcu : (3 ticks this GP) idle=362/0/0x3 softirq=61631 /61 631 
fqs=10077
[17480 . 204889] (detected by 3 , t=24007 jiffies , g=218453 , q=5285) [1 7480 
. 21 7986] Task dump for CPU 7 :
[17480.222379] swapper/7R running task  0 
0  0x0000002a [17480.229073] Call trace :
[1 7480.241518] switch t0+0x104/0x1 f8
[17480.249839]  Ox7fffffffffffffff
[17660.232314] rcu : INFO: rcu sched detected stalls on CPUs/ tasks :
[17660.233580] rcu : (3 ticks this GP) idle=362/0/0x3 softirq=61631 /61 631 
fqs=17770
[17660.235837] (detected by 3,t=42012 jiffies , g=218453 , q=7039) 
[17660 . 237955] Task dump for CPU 7 :
[17660.238900] swapper/ 7  R running task  0   0
[17660.242967] Call trace :
[17660.246192]  switch t0+0x104/0x1 f8
[17660.253215]  Ox7fffffffffffffff

Obviously qemu-system-aarch64 caused these bugs.

qemu version: 4.x(I have tested version 4.0 & 4.1.0 & 4.2.0)
host architecture: aarch64(Qualcomm Snapdragon series)
host system:Ubuntu devel 20.04& Debian 10(I have tested on many devices)

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1861653

Title:
  CPU of qemu-system-aarch64 always stuck

Status in QEMU:
  New

Bug description:
  I started qemu with these arguments:
   qemu-system-aarch64 -M virt-2.9 -cpu cortex-a72 -smp 
cores=8,threads=1,sockets=1 -m 2G -device nec-usb-xhci -device usb-kbd -device 
usb-tablet -pflash /sdcard/QEMU_EFI.img -pflash /sdcard/QEMU_VARS.img -device 
virtio-blk-device,drive=Ubuntu -drive if=none,id=Ubuntu,file=Ubuntu.vhd 
-nographic -net user -net nic,model=rtl8139 -kernel linux -initrd initrd.gz
  The setup program of Ubuntu devel aarch64 ran normally.But after several 
hours,the CPUs emulated by qemu-system-aarch64 went wrong.
  Here are the messages displayed on the tty
  [15842.164745] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9]                                                                 
        [15930.163589] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9]
  [16110.163540] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9] 
  [16290.162801] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9]
  [16470.163927] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9] 
  [16650.163246] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9] 
  [16830.163216] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! 
[ksoftirqd/0:9] 
  [17010.164504] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[ksoftirqd/0:9]

  Then I tried CentOS 7.1908 aarch64 with almost the same arguments.
  After several hours,it went wrong too.
  [17480 . 201 1 58] rcu : (3 ticks this GP) idle=362/0/0x3 softirq=61631 /61 
631 fqs=10077
  [17480 . 204889] (detected by 3 , t=24007 jiffies , g=218453 , q=5285) [1 
7480 . 21 7986] Task dump for CPU 7 :
  [17480.222379] swapper/7R running task        0 
  0  0x0000002a [17480.229073] Call trace :
  [1 7480.241518]       switch t0+0x104/0x1 f8
  [17480.249839]        Ox7fffffffffffffff
  [17660.232314] rcu : INFO: rcu sched detected stalls on CPUs/ tasks :
  [17660.233580] rcu : (3 ticks this GP) idle=362/0/0x3 softirq=61631 /61 631 
fqs=17770
  [17660.235837] (detected by 3,t=42012 jiffies , g=218453 , q=7039) 
  [17660 . 237955] Task dump for CPU 7 :
  [17660.238900] swapper/ 7  R running task  0   0
  [17660.242967] Call trace :
  [17660.246192]        switch t0+0x104/0x1 f8
  [17660.253215]        Ox7fffffffffffffff

  Obviously qemu-system-aarch64 caused these bugs.

  qemu version: 4.x(I have tested version 4.0 & 4.1.0 & 4.2.0)
  host architecture: aarch64(Qualcomm Snapdragon series)
  host system:Ubuntu devel 20.04& Debian 10(I have tested on many devices)

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