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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/819.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 819
-title = "watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [swapper/1:0]"
-state = "closed"
-created_at = "2022-01-14T14:13:28.390Z"
-closed_at = "2023-01-27T13:03:23.834Z"
-labels = ["Migration"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/819"
-host-os = "proxmox 6.4"
-host-arch = "x86_64"
-qemu-version = "pve-qemu-kvm_5.2"
-guest-os = "Debian 10.10"
-guest-arch = "x86_64"
-description = """During virtual disk live move/migration, VMs get severe stuttering and even cpu soft lockups, as described here:
-
-https://bugzilla.kernel.org/show_bug.cgi?id=199727
-
-This also happens on some of our virtual machines when i/o load inside VM is high or workload is fsync centric.
-
-i'm searching for a solution to mitigate this problem, i.e. i can live with the stuttering/delays of several seconds, but getting cpu soft lockups of 22s or higher is inacceptable. 
-
-i have searched the web for a long long time now, but did not find a solution , nor did i find a way on how to troubleshoot this more in depth to find the real root cause.
-
-if this issue report will not getting accepted because of "non native qemu" (i.e. proxmox platform) , please tell me which qemu/distro i can/should use instead (which has easy usable live migration feature) to try reproducing the problem."""
-reproduce = """1. do a live migration of one or more virtual machine disks
-2. watch "ioping -WWWYy test.dat" inside VM (being moved) for disk latency
-3. you disk latency is heavily varying , from time to time it goes up to vaues of tens seconds, even leading to kernel messages like " kernel:[ 2155.520846] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [swapper/1:0]"
-
-```
-4 KiB >>> test.dat (ext4 /dev/sda1): request=55 time=1.07 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=56 time=1.24 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=57 time=567.4 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=58 time=779.0 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=59 time=589.0 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=60 time=1.57 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=61 time=847.7 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=62 time=933.0 ms
-4 KiB >>> test.dat (ext4 /dev/sda1): request=63 time=891.4 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=64 time=820.8 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=65 time=1.02 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=66 time=2.44 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=67 time=620.7 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=68 time=1.03 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=69 time=1.24 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=70 time=1.42 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=71 time=1.36 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=72 time=1.41 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=73 time=1.33 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=74 time=2.36 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=75 time=1.46 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=76 time=1.45 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=77 time=1.28 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=78 time=1.41 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=79 time=2.33 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=80 time=1.39 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=81 time=1.35 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=82 time=1.54 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=83 time=1.52 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=84 time=1.50 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=85 time=2.00 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=86 time=1.47 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=87 time=1.26 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=88 time=1.29 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=89 time=2.05 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=90 time=1.44 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=91 time=1.43 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=92 time=1.72 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=93 time=1.77 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=94 time=2.56 s
-
-Message from syslogd@iotest2 at Jan 14 14:51:12 ...
- kernel:[ 2155.520846] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [swapper/1:0]
-4 KiB >>> test.dat (ext4 /dev/sda1): request=95 time=22.5 s (slow)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=96 time=3.56 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=97 time=1.52 s (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=98 time=1.69 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=99 time=1.90 s
-4 KiB >>> test.dat (ext4 /dev/sda1): request=100 time=1.15 s (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=101 time=890.0 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=102 time=959.6 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=103 time=926.5 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=104 time=791.5 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=105 time=577.8 ms (fast)
-4 KiB >>> test.dat (ext4 /dev/sda1): request=106 time=867.7 ms (fast)
-```"""
-additional = "n/a"