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

From: Launchpad Bug Tracker <1861653@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1861653] Re: CPU of qemu-system-aarch64 always stuck
Date: Mon, 05 Jul 2021 04:17:25 -0000	[thread overview]
Message-ID: <162545864592.12677.8758861024214132942.malone@loganberry.canonical.com> (raw)
In-Reply-To: 158071042004.19865.7386710530747108432.malonedeb@wampee.canonical.com

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

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

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Title:
  CPU of qemu-system-aarch64 always stuck

Status in QEMU:
  Expired

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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