From: Jiri Slaby <jirislaby@kernel•org>
To: Thomas Gleixner <tglx@kernel•org>, Peter Zijlstra <peterz@infradead•org>
Cc: "Matthieu Baerts" <matttbe@kernel•org>,
"Stefan Hajnoczi" <stefanha@redhat•com>,
"Stefano Garzarella" <sgarzare@redhat•com>,
kvm@vger•kernel.org, virtualization@lists•linux.dev,
Netdev <netdev@vger•kernel.org>,
rcu@vger•kernel.org, "MPTCP Linux" <mptcp@lists•linux.dev>,
"Linux Kernel" <linux-kernel@vger•kernel.org>,
"Shinichiro Kawasaki" <shinichiro.kawasaki@wdc•com>,
"Paul E. McKenney" <paulmck@kernel•org>,
"Dave Hansen" <dave.hansen@linux•intel.com>,
"luto@kernel•org" <luto@kernel•org>,
"Michal Koutný" <MKoutny@suse•com>,
"Waiman Long" <longman@redhat•com>
Subject: Re: Stalls when starting a VSOCK listening socket: soft lockups, RCU stalls, timeout
Date: Thu, 5 Mar 2026 18:33:11 +0100 [thread overview]
Message-ID: <47cba228-bba7-4e58-a69d-ea41f8de6602@kernel.org> (raw)
In-Reply-To: <87zf4m2qvo.ffs@tglx>
On 05. 03. 26, 17:16, Thomas Gleixner wrote:
>> Dump of any other's mm_cids needed?
>
> It would be helpful to see the content of all PCPU CIDs and
> tsk::mm_cid::* for all tasks which belong to that process.
Not sure which of the two processes. So both:
crash> rd __per_cpu_offset 4
ffffffff94c38160: ffff8cc799a6c000 ffff8cc799aec000 ................
ffffffff94c38170: ffff8cc799b6c000 ffff8cc799bec000 ................
====== PID 7680 (spinning in mm_get_cid()) ======
4 tasks with
mm = 0xffff8cc406824680
mm_cid.pcpu = 0x66222619df00,
crash> task -x -R mm_cid ffff8cc4038525c0 ffff8cc40ad40000
ffff8cc40683cb80 ffff8cc418424b80
PID: 7680 TASK: ffff8cc4038525c0 CPU: 1 COMMAND: "asm"
mm_cid = {
active = 0x1,
cid = 0x80000000
},
PID: 7681 TASK: ffff8cc40ad40000 CPU: 3 COMMAND: "asm"
mm_cid = {
active = 0x1,
cid = 0x40000000
},
PID: 7682 TASK: ffff8cc40683cb80 CPU: 0 COMMAND: "asm"
mm_cid = {
active = 0x1,
cid = 0x40000002
},
PID: 7684 TASK: ffff8cc418424b80 CPU: 2 COMMAND: "asm"
mm_cid = {
active = 0x1,
cid = 0x40000001
},
crash> struct mm_cid_pcpu -x 0xfffff2e9bfc09f00
struct mm_cid_pcpu {
cid = 0x40000002
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfc89f00
struct mm_cid_pcpu {
cid = 0x0
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfd09f00
struct mm_cid_pcpu {
cid = 0x40000001
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfd89f00
struct mm_cid_pcpu {
cid = 0x40000000
}
====== PID 7508 (sleeping, holding the rq lock) ======
6 tasks with
mm = 0xffff8cc407222340
mm_cid.pcpu = 0x66222619df40,
crash> task -x -R mm_cid ffff8cc43d090000 ffff8cc43d094b80
ffff8cc494a00000 ffff8cc494a04b80 ffff8cc4038b8000 ffff8cc4038bcb80
PID: 7504 TASK: ffff8cc43d090000 CPU: 0 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000001
},
PID: 7505 TASK: ffff8cc43d094b80 CPU: 1 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000003
},
PID: 7506 TASK: ffff8cc494a00000 CPU: 3 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000000
},
PID: 7507 TASK: ffff8cc494a04b80 CPU: 2 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000002
},
PID: 7508 TASK: ffff8cc4038b8000 CPU: 1 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000003
},
PID: 7630 TASK: ffff8cc4038bcb80 CPU: 2 COMMAND: "compile"
mm_cid = {
active = 0x1,
cid = 0x40000002
},
crash> struct mm_cid_pcpu -x 0xfffff2e9bfc09f40
struct mm_cid_pcpu {
cid = 0x40000001
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfc89f40
struct mm_cid_pcpu {
cid = 0x40000003
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfd09f40
struct mm_cid_pcpu {
cid = 0x40000002
}
crash> struct mm_cid_pcpu -x 0xfffff2e9bfd89f40
struct mm_cid_pcpu {
cid = 0x40000000
}
Anything else :)?
--
js
suse labs
next prev parent reply other threads:[~2026-03-05 17:33 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-06 11:54 Stalls when starting a VSOCK listening socket: soft lockups, RCU stalls, timeout Matthieu Baerts
2026-02-06 16:38 ` Stefano Garzarella
2026-02-06 17:13 ` Matthieu Baerts
2026-02-26 10:37 ` Jiri Slaby
2026-03-02 5:28 ` Jiri Slaby
2026-03-02 11:46 ` Peter Zijlstra
2026-03-02 14:30 ` Waiman Long
2026-03-05 7:00 ` Jiri Slaby
2026-03-05 11:53 ` Jiri Slaby
2026-03-05 12:20 ` Jiri Slaby
2026-03-05 16:16 ` Thomas Gleixner
2026-03-05 17:33 ` Jiri Slaby [this message]
2026-03-05 19:25 ` Thomas Gleixner
2026-03-06 5:48 ` Jiri Slaby
2026-03-06 9:57 ` Thomas Gleixner
2026-03-06 10:16 ` Jiri Slaby
2026-03-06 16:28 ` Thomas Gleixner
2026-03-06 11:06 ` Matthieu Baerts
2026-03-06 16:57 ` Matthieu Baerts
2026-03-06 18:31 ` Jiri Slaby
2026-03-06 18:44 ` Matthieu Baerts
2026-03-06 21:40 ` Matthieu Baerts
2026-03-06 15:24 ` Peter Zijlstra
2026-03-07 9:01 ` Thomas Gleixner
2026-03-07 22:29 ` Thomas Gleixner
2026-03-08 9:15 ` Thomas Gleixner
2026-03-08 16:55 ` Jiri Slaby
2026-03-08 16:58 ` Thomas Gleixner
2026-03-08 17:23 ` Matthieu Baerts
2026-03-09 8:43 ` Thomas Gleixner
2026-03-09 12:23 ` Matthieu Baerts
2026-03-10 8:09 ` Thomas Gleixner
2026-03-10 8:20 ` Thomas Gleixner
2026-03-10 8:56 ` Jiri Slaby
2026-03-10 9:00 ` Jiri Slaby
2026-03-10 10:03 ` Thomas Gleixner
2026-03-10 10:06 ` Thomas Gleixner
2026-03-10 11:24 ` Matthieu Baerts
2026-03-10 11:54 ` Peter Zijlstra
2026-03-10 12:28 ` Thomas Gleixner
2026-03-10 13:40 ` Matthieu Baerts
2026-03-10 13:47 ` Thomas Gleixner
2026-03-10 15:51 ` Matthieu Baerts
2026-03-03 13:23 ` Matthieu Baerts
2026-03-05 6:46 ` Jiri Slaby
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47cba228-bba7-4e58-a69d-ea41f8de6602@kernel.org \
--to=jirislaby@kernel$(echo .)org \
--cc=MKoutny@suse$(echo .)com \
--cc=dave.hansen@linux$(echo .)intel.com \
--cc=kvm@vger$(echo .)kernel.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=longman@redhat$(echo .)com \
--cc=luto@kernel$(echo .)org \
--cc=matttbe@kernel$(echo .)org \
--cc=mptcp@lists$(echo .)linux.dev \
--cc=netdev@vger$(echo .)kernel.org \
--cc=paulmck@kernel$(echo .)org \
--cc=peterz@infradead$(echo .)org \
--cc=rcu@vger$(echo .)kernel.org \
--cc=sgarzare@redhat$(echo .)com \
--cc=shinichiro.kawasaki@wdc$(echo .)com \
--cc=stefanha@redhat$(echo .)com \
--cc=tglx@kernel$(echo .)org \
--cc=virtualization@lists$(echo .)linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox