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Bug#1111496: Unstable kauditd after DSA 5973-1 on QEMU VMs

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  Bug#1111496: Unstable kauditd after DSA 5973-1 on QEMU VMs Paweł Bogusławski <pawel.boguslawski@ib.pl> - 2025-08-18 18:20 +0200
    Bug#1111496: marked as done (Unstable kauditd after DSA 5973-1 on  QEMU VMs) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-08-27 09:10 +0200

#88912 — Bug#1111496: Unstable kauditd after DSA 5973-1 on QEMU VMs

Package: linux-image-amd64
Version: 6.1.147-1

After updating kernel from linux-image-6.1.0-37-amd64 to 
linux-image-6.1.0-38-amd64 virtual
machines (qemu/kvm) sometimes stop booting after auditd.service is 
started (hard reset required).

Noticed that sometimes restarting auditd with

systemctl restart auditd

makes kauditd to saturate CPU:

2025-08-18 16:52:09 myhost kernel: [  161.943629] rcu: INFO: rcu_preempt 
self-detected stall on CPU
2025-08-18 16:52:09 myhost kernel: [  161.943633] rcu: 1-....: (1 GPs 
behind) idle=8664/1/0x4000000000000000 softirq=50309/50310 fqs=2621
2025-08-18 16:52:09 myhost kernel: [  161.943645]      (t=5250 jiffies 
g=14713 q=6748 ncpus=2)
2025-08-18 16:52:09 myhost kernel: [  161.943648] CPU: 1 PID: 28 Comm: 
kauditd Not tainted 6.1.0-38-amd64 #1  Debian 6.1.147-1
2025-08-18 16:52:09 myhost kernel: [  161.943650] Hardware name: QEMU 
Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
2025-08-18 16:52:09 myhost kernel: [  161.943653] RIP: 
0010:__netlink_lookup+0x7e/0x150
2025-08-18 16:52:09 myhost kernel: [  161.943661] Code: 04 24 89 ce 31 
ca c1 c6 0e 29 f2 89 d6 31 d0 c1 c6 0b 29 f0 89 c6 31 c1 c1 ce 07 29 f1 
89 ce 31 ca c1 c6 10 29 f2 89 d6 31 d0 <c1> c6 04 29 f0 31 c1 c1 c0 0e 
29 c1 8b 45 00 31 ca c1 c9 08 8d 70
2025-08-18 16:52:09 myhost kernel: [  161.943662] RSP: 
0018:ffffb481c00f7de0 EFLAGS: 00000282
2025-08-18 16:52:09 myhost kernel: [  161.943664] RAX: 000000009729b464 
RBX: ffff9de94129c750 RCX: 00000000c99eae01
2025-08-18 16:52:09 myhost kernel: [  161.943665] RDX: 00000000bc1dd355 
RSI: 00000000bc1dd355 RDI: ffff9de94129c750
2025-08-18 16:52:09 myhost kernel: [  161.943666] RBP: ffff9de949f18100 
R08: ffff9de9493b8b48 R09: ffff9de949f18169
2025-08-18 16:52:09 myhost kernel: [  161.943667] R10: 0000000000000000 
R11: 0000000000000000 R12: ffff9de94ac4cb00
2025-08-18 16:52:09 myhost kernel: [  161.943668] R13: 00000000000050dd 
R14: 0000000000000001 R15: ffffffff96895cc0
2025-08-18 16:52:09 myhost kernel: [  161.943669] FS: 
0000000000000000(0000) GS:ffff9de97ed00000(0000) knlGS:0000000000000000
2025-08-18 16:52:09 myhost kernel: [  161.943670] CS:  0010 DS: 0000 ES: 
0000 CR0: 0000000080050033
2025-08-18 16:52:09 myhost kernel: [  161.943671] CR2: 00007f896f0ff445 
CR3: 000000001d810005 CR4: 0000000000170ee0
2025-08-18 16:52:09 myhost kernel: [  161.943676] Call Trace:
2025-08-18 16:52:09 myhost kernel: [  161.943684]  <TASK>
2025-08-18 16:52:09 myhost kernel: [  161.943692] 
netlink_unicast+0x130/0x3d0
2025-08-18 16:52:09 myhost kernel: [  161.943695]  ? 
audit_net_exit+0x30/0x30
2025-08-18 16:52:09 myhost kernel: [  161.943698] 
kauditd_send_queue+0xab/0x180
2025-08-18 16:52:09 myhost kernel: [  161.943702]  ? 
audit_log_lost+0x90/0x90
2025-08-18 16:52:09 myhost kernel: [  161.943704] kauditd_thread+0x12e/0x2d0
2025-08-18 16:52:09 myhost kernel: [  161.943706]  ? cpuusage_read+0x10/0x10
2025-08-18 16:52:09 myhost kernel: [  161.943709]  ? auditd_reset+0x90/0x90
2025-08-18 16:52:09 myhost kernel: [  161.943710] kthread+0xda/0x100
2025-08-18 16:52:09 myhost kernel: [  161.943715]  ? 
kthread_complete_and_exit+0x20/0x20
2025-08-18 16:52:09 myhost kernel: [  161.943717] ret_from_fork+0x22/0x30
2025-08-18 16:52:09 myhost kernel: [  161.943732]  </TASK>

No such problem when choosing prev kernel "6.1.0-37-amd64" in grub or 
after new kernel deinstallation with

apt-get remove linux-image-6.1.0-38-amd64

-- 

Regards,

Paweł Bogusławski
E:pawel.boguslawski@ib.pl

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#88995 — Bug#1111496: marked as done (Unstable kauditd after DSA 5973-1 on QEMU VMs)

[Multipart message — attachments visible in raw view] — view raw

Your message dated Wed, 27 Aug 2025 07:02:56 +0000
with message-id <E1urABM-007yKv-2o@fasolo.debian.org>
and subject line Bug#1111017: fixed in linux 6.1.148-1
has caused the Debian Bug report #1111017,
regarding Unstable kauditd after DSA 5973-1 on QEMU VMs
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
1111017: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1111017
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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