Public bug reported:
The following is observed when running heavier I/O to our NVMe/TCP
target:
2024-06-11T23:16:42.773199+00:00 blr-r19-s33u kernel: INFO: rcu_tasks detected
stalls on tasks:
2024-06-11T23:16:42.773232+00:00 blr-r19-s33u kernel: 000000003db97b04: ..
nvcsw: 34791011/34791011 holdout: 1 idle_cpu: -1/1
2024-06-11T23:16:42.773236+00:00 blr-r19-s33u kernel: task:kworker/1:1H
state:R running task stack:0 pid:881 tgid:881 ppid:2
flags:0x00004000
2024-06-11T23:16:42.773239+00:00 blr-r19-s33u kernel: Workqueue: nvme_tcp_wq
nvme_tcp_io_work [nvme_tcp]
2024-06-11T23:16:42.773243+00:00 blr-r19-s33u kernel: Call Trace:
2024-06-11T23:16:42.773245+00:00 blr-r19-s33u kernel: <TASK>
2024-06-11T23:16:42.773247+00:00 blr-r19-s33u kernel: ? release_sock+0x8d/0xb0
2024-06-11T23:16:42.773249+00:00 blr-r19-s33u kernel: ?
nvme_tcp_io_work+0x7f/0xe0 [nvme_tcp]
2024-06-11T23:16:42.773254+00:00 blr-r19-s33u kernel: ?
process_one_work+0x16c/0x350
2024-06-11T23:16:42.773257+00:00 blr-r19-s33u kernel: ?
worker_thread+0x306/0x440
2024-06-11T23:16:42.773259+00:00 blr-r19-s33u kernel: ?
_raw_spin_lock_irqsave+0xe/0x20
2024-06-11T23:16:42.773262+00:00 blr-r19-s33u kernel: ?
__pfx_worker_thread+0x10/0x10
2024-06-11T23:16:42.773265+00:00 blr-r19-s33u kernel: ? kthread+0xef/0x120
2024-06-11T23:16:42.773267+00:00 blr-r19-s33u kernel: ? __pfx_kthread+0x10/0x10
2024-06-11T23:16:42.773270+00:00 blr-r19-s33u kernel: ? ret_from_fork+0x44/0x70
2024-06-11T23:16:42.773273+00:00 blr-r19-s33u kernel: ? __pfx_kthread+0x10/0x10
2024-06-11T23:16:42.773276+00:00 blr-r19-s33u kernel: ?
ret_from_fork_asm+0x1b/0x30
root@blr-r19-s33u:~# uname -a
Linux blr-r19-s33u 6.8.0-31-generic #31-Ubuntu SMP PREEMPT_DYNAMIC Sat Apr
20
00:40:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
root@blr-r19-s33u:~# uname -r
6.8.0-31-generic
root@blr-r19-s33u:~# cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy
-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo
root@blr-r19-s33u:~#
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2069207
Title:
rcu_tasks detected stalls on tasks
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