qubes.WaitForSession processes keep accumulating with preloaded DispVMs #10443
Description
Qubes OS release
r4.3
Brief summary
qubes.WaitForSession processes keep accumulating with preloaded DispVMs, consuming CPU cycles quite noticeably after a point.
Steps to reproduce
- Launch and shut down many preloaded DispVMs in succession.
Expected behavior
At most N WaitForSession processes, where N is the amount of paused DispVMs.
Actual behavior
It seems that in the case of my system (in-place upgraded from r4.2), qubes.WaitForSession processes just never die after preloaded dispVMs are created and then shut down.
user@dom0 ~ % pgrep -f qubes.WaitForSession | wc -l
49
user@dom0 ~ % ps aux | grep WaitForSession
user 6265 0.2 0.0 231068 3624 ? S Nov30 2:23 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 6732 0.3 0.0 231068 3556 ? S Nov30 2:26 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 6863 0.2 0.0 231068 3704 ? S Nov30 2:21 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 9097 0.3 0.0 231068 3548 ? S Nov30 2:26 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 10856 0.3 0.0 231068 3504 ? S Nov30 2:27 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 19430 0.2 0.0 231068 3592 ? S Nov30 2:22 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 91126 0.3 0.0 231068 3612 ? S 00:00 2:15 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 162332 0.2 0.0 231068 3700 ? S 01:00 1:57 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 240638 0.2 0.0 231068 3616 ? S 02:00 1:47 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 325954 0.2 0.0 231068 3744 ? S 03:00 1:35 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 336899 0.2 0.0 231068 3556 ? S 03:07 1:36 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 424706 0.2 0.0 231068 3616 ? S 04:00 1:24 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 517814 0.2 0.0 231068 3596 ? S 04:52 1:13 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 519546 0.2 0.0 231068 3524 ? S 04:53 1:14 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 520134 0.2 0.0 231068 3532 ? S 04:53 1:13 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 520541 0.2 0.0 231068 3428 ? S 04:53 1:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 521147 0.2 0.0 231068 3752 ? S 04:54 1:13 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 523254 0.2 0.0 231068 3616 ? S 04:54 1:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 524657 0.2 0.0 231068 3692 ? S 04:55 1:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 536324 0.2 0.0 231068 3592 ? S 05:00 1:11 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 699367 0.2 0.0 231068 3484 ? S 06:00 0:59 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 869480 0.2 0.0 231068 3616 ? S 07:00 0:47 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1046521 0.2 0.0 231068 3576 ? S 08:00 0:34 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1230678 0.1 0.0 231068 3544 ? S 09:00 0:23 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1370061 0.1 0.0 231068 3516 ? S 09:43 0:14 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1379141 0.1 0.0 231068 3752 ? S 09:45 0:14 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1386614 0.1 0.0 231068 3540 ? S 09:47 0:14 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1440324 0.1 0.0 231068 3492 ? S 10:00 0:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1457882 0.1 0.0 231068 3472 ? S 10:04 0:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1459206 0.1 0.0 231068 3612 ? S 10:04 0:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1460821 0.1 0.0 231068 3648 ? S 10:04 0:12 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1574371 0.1 0.0 231068 3648 ? S 10:28 0:09 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1577553 0.1 0.0 231068 3756 ? S 10:29 0:10 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1598899 0.1 0.0 231068 3596 ? S 10:33 0:09 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1698953 0.1 0.0 231068 3420 ? S 10:53 0:08 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1703588 0.1 0.0 231068 3660 ? S 10:54 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1705115 0.1 0.0 231068 3620 ? S 10:54 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1706148 0.1 0.0 231068 3680 ? S 10:54 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1707542 0.1 0.0 231068 3516 ? S 10:55 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1712583 0.1 0.0 231068 3648 ? S 10:55 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1715736 0.1 0.0 231068 3652 ? S 10:56 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1735875 0.1 0.0 231068 3612 ? S 11:00 0:07 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1844016 0.1 0.0 231068 3504 ? S 11:18 0:06 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1979269 0.1 0.0 231068 3656 ? S 11:40 0:03 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 1980881 0.1 0.0 231068 3456 ? S 11:40 0:03 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 2026380 0.1 0.0 231068 3648 ? S 11:47 0:02 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 2035088 0.1 0.0 231068 3664 ? S 11:49 0:02 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 2037280 0.1 0.0 231068 3596 ? S 11:49 0:02 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
user 2104307 0.1 0.0 231068 3776 ? S 12:00 0:02 /usr/bin/bash /etc/qubes-rpc/qubes.WaitForSession
After launching and shutting down 2 more:
user@dom0 ~ % pgrep -f qubes.WaitForSession | wc -l
51
Additional information
CPU usage difference after killing all the processes (which also screws up the rest of the preloaded DispVMs, sadly):
Dropped from around 15% per-core at 50 processes.
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This issue pertains to the use of Salt (aka SaltStack) in Qubes OS.This issue pertains to a Qubes core component.Priority: default. Default priority for new issues, to be replaced given sufficient information.This issue affects Qubes OS 4.3.Technical diagnosis of this issue has been performed.A pull request has been submitted for this issue.
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