[Bug 1862874] Re: java may stuck for a long time in system mode with "-cpu max"

[Thomas Huth]

The QEMU project is currently moving 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 the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.


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

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https://bugs.launchpad.net/bugs/1862874

Title:
  java may stuck for a long time in system mode with "-cpu max"

Status in QEMU:
  Incomplete

Bug description:
  Bug Description:
  Run "java -version" in guest VM, java may stuck for a long time (several 
hours) and then recover.

  Steps to reproduce:
  1. Launch VM by attached simple script: launch.sh
  2. Execute "java -version" and then print "date" in a loop
      while :
      do
        /home/bot/jdk/bin/java -version
        date
      done
  3. A long time gap will be observed: may > 24 hours.

  Technical details:
  * host: x86_64 Linux 4.15.0-70-generic
  * qemu v4.2.0
  * java: tried two versions: openjdk-11-jre-headless or compiled java-13 
  * command-line: (See details in launch.sh)
  /home/bot/qemu/qemu-build/qemu-4.2.0/binaries/bin/qemu-system-x86_64 \
    -drive "file=${img},format=qcow2" \
    -drive "file=${user_data},format=raw" \
    -cpu max \
    -m 24G \
    -serial mon:stdio \
    -smp 8 \
    -nographic \
  ;

  * Observed by java core dump generated by "kill -SIGSEGV" when java stucked:
  Different pthreads are blocked on their own condition variables:

    Id   Target Id         Frame
    1    Thread 0x7f48a041a080 (LWP 22470) __GI_raise (sig=sig@entry=6)
      at ../sysdeps/unix/sysv/linux/raise.c:51
    2    Thread 0x7f487197d700 (LWP 22473) 0x00007f489f5c49f3 in 
futex_wait_cancelable (private=<optimized out>, expected=0, 
futex_word=0x7f48980197c0)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:88
    3    Thread 0x7f4861b89700 (LWP 22483) 0x00007f489f5c4ed9 in 
futex_reltimed_wait_cancelable (private=<optimized out>, 
reltime=0x7f4861b88960, expected=0,
      futex_word=0x7f489801b084)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:142
    4    Thread 0x7f4861e8c700 (LWP 22480) 0x00007f489f5c76d6 in 
futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, 
futex_word=0x7f48980107c0)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:205
    5    Thread 0x7f4861c8a700 (LWP 22482) 0x00007f489f5c4ed9 in 
futex_reltimed_wait_cancelable (private=<optimized out>, 
reltime=0x7f4861c89800, expected=0,
      futex_word=0x7f489801ed44)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:142
    6    Thread 0x7f48a0418700 (LWP 22471) 0x00007f4880b13200 in ?? ()
    7    Thread 0x7f48703ea700 (LWP 22478) 0x00007f489f5c49f3 in 
futex_wait_cancelable (private=<optimized out>, expected=0, 
futex_word=0x7f489801dfc0)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:88
    8    Thread 0x7f48702e9700 (LWP 22479) 0x00007f489f5c49f3 in 
futex_wait_cancelable (private=<optimized out>, expected=0, 
futex_word=0x7f489838cd84)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:88
    9    Thread 0x7f4870f71700 (LWP 22475) 0x00007f489f5c49f3 in 
futex_wait_cancelable (private=<optimized out>, expected=0, 
futex_word=0x7f489801a300)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:88
    10   Thread 0x7f487187b700 (LWP 22474) 0x00007f489f5c76d6 in 
futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, 
futex_word=0x7f48980cf770)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:205
    11   Thread 0x7f4871a7f700 (LWP 22472) 0x00007f489f5c76d6 in 
futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, 
futex_word=0x7f489809ba30)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:205
    12   Thread 0x7f4861d8b700 (LWP 22481) 0x00007f489f5c4ed9 in 
futex_reltimed_wait_cancelable (private=<optimized out>, 
reltime=0x7f4861d8a680, expected=0,
      futex_word=0x7f489801ed44)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:142
    13   Thread 0x7f48704ec700 (LWP 22477) 0x00007f489f5c4ed9 in 
futex_reltimed_wait_cancelable (private=<optimized out>, 
reltime=0x7f48704eb910, expected=0,
      futex_word=0x7f489801d120)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:142
    14   Thread 0x7f4870e6f700 (LWP 22476) 0x00007f489f5c4ed9 in 
futex_reltimed_wait_cancelable (private=<optimized out>, 
reltime=0x7f4870e6eb20, expected=0,
      futex_word=0x7f489828abd0)
      at ../sysdeps/unix/sysv/linux/futex-internal.h:142

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