XPost: linux.debian.bugs.dist
From: carnil@debian.org
Control: tags -1 + moreinfo
On Fri, Nov 14, 2025 at 11:40:13PM -0800, Nick Owens wrote:
> Package: src:linux
> Version: 6.12.43-1
> Severity: important
>
> Dear Maintainer,
>
> * What led up to the situation?
> machine is a server on commodity hardware. it runs some vms, and runs
prometheus/node-exporter/grafana.
> * What exactly did you do (or not do) that was effective (or
> ineffective)?
> the machine is left on like a server for many days at a time.
> * What was the outcome of this action?
> after some days, the machine locks up. i can't login over ssh and the
console is unusable. there are many reports of hung tasks in the kernel that
appear to be blocked on mutex acquisition.
> * What outcome did you expect instead?
> no hang.
>
>
> -- Package-specific info:
> ** Version:
> Linux version 6.12.43+deb13-amd64 (debian-kernel@lists.debian.org)
(x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for
Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Debian 6.12.43-1 (2025-08-27)
>
> ** Command line:
> BOOT_IMAGE=/boot/vmlinuz-6.12.43+deb13-amd64 root=/dev/mapper/root-root ro
console=tty0 console=ttyS0,115200 rcu_nocbs=0-15
>
> ** Not tainted
>
> ** Kernel log:
> (note: i am attaching logs of a boot that hung here)
>
> Sep 28 16:17:22 sokoban kernel: INFO: task systemd-network:1260549 blocked
for more than 120 seconds.
> Sep 28 16:17:22 sokoban kernel: Tainted: G OE
6.10.3-amd64 #1 Debian 6.10.3-1
> Sep 28 16:17:22 sokoban kernel: "echo 0 > /proc/sys/kernel/hun
_task_timeout_secs" disables this message.
> Sep 28 16:17:22 sokoban kernel: task:systemd-network state:D stack:0
pid:1260549 tgid:1260549 ppid:1 flags:0x00000006
> Sep 28 16:17:22 sokoban kernel: Call Trace:
> Sep 28 16:17:22 sokoban kernel:
> Sep 28 16:17:22 sokoban kernel: __schedule+0x3eb/0xb40
> Sep 28 16:17:22 sokoban kernel: schedule+0x27/0xf0
> Sep 28 16:17:22 sokoban kernel: schedule_preempt_disabled+0x15/0x30
> Sep 28 16:17:22 sokoban kernel: __mutex_lock.constprop.0+0x339/0x630
> Sep 28 16:17:22 sokoban kernel: netlink_dump+0x338/0x3b0
> Sep 28 16:17:22 sokoban kernel: __netlink_dump_start+0x1dd/0x2a0
> Sep 28 16:17:22 sokoban kernel: ? __pfx_rtnl_dump_ifinfo+0x10/0x10
> Sep 28 16:17:22 sokoban kernel: rtnetlink_rcv_msg+0x2ac/0x3f0
> Sep 28 16:17:22 sokoban kernel: ? __pfx_rtnl_dumpit+0x10/0x10
> Sep 28 16:17:22 sokoban kernel: ? __pfx_rtnl_dump_ifinfo+0x10/0x10
> Sep 28 16:17:22 sokoban kernel: ? __pfx_rtnetlink_rcv_msg+0x10/0x10
> Sep 28 16:17:22 sokoban kernel: netlink_rcv_skb+0x5b/0x110
> Sep 28 16:17:22 sokoban kernel: netlink_unicast+0x19c/0x290
> Sep 28 16:17:22 sokoban kernel: netlink_sendmsg+0x222/0x490
> Sep 28 16:17:22 sokoban kernel: __sys_sendto+0x1df/0x1f0
> Sep 28 16:17:22 sokoban kernel: __x64_sys_sendto+0x24/0x30
> Sep 28 16:17:22 sokoban kernel: do_syscall_64+0x82/0x190
> Sep 28 16:17:22 sokoban kernel: ? srso_return_thunk+0x5/0x5f
> Sep 28 16:17:22 sokoban kernel: ? syscall_exit_to_user_mode+0x77/0x210
> Sep 28 16:17:22 sokoban kernel: ? srso_return_thunk+0x5/0x5f
> Sep 28 16:17:22 sokoban kernel: ? do_syscall_64+0x8e/0x190
> Sep 28 16:17:22 sokoban kernel: ? srso_return_thunk+0x5/0x5f
> Sep 28 16:17:22 sokoban kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
> Sep 28 16:17:22 sokoban kernel: RIP: 0033:0x7fcfe471e643
> Sep 28 16:17:22 sokoban kernel: RSP: 002b:00007ffe0821c038 EFLAGS: 00000202
ORIG_RAX: 000000000000002c
> Sep 28 16:17:22 sokoban kernel: RAX: ffffffffffffffda RBX: 000055a3f48a2c90
RCX: 00007fcfe471e643
> Sep 28 16:17:22 sokoban kernel: RDX: 0000000000000020 RSI: 000055a3f48f3670
RDI: 0000000000000003
> Sep 28 16:17:22 sokoban kernel: RBP: 000055a3f48f3240 R08: 00007ffe0821c040
R09: 0000000000000080
> Sep 28 16:17:22 sokoban kernel: R10: 0000000000000000 R11: 0000000000000202
R12: 00007ffe0821c104
> Sep 28 16:17:22 sokoban kernel: R13: 00007ffe0821c170 R14: 000055a3f48a0f50
R15: 0000000000000003
> Sep 28 16:17:22 sokoban kernel:
> Sep 28 16:17:22 sokoban kernel: INFO: task prometheus-node:1270917 blocked
for more than 121 seconds.
> Sep 28 16:17:23 sokoban kernel: Tainted: G OE
6.10.3-amd64 #1 Debian 6.10.3-1
> Sep 28 16:17:23 sokoban kernel: "echo 0 > /proc/sys/kernel/hun
_task_timeout_secs" disables this message.
> Sep 28 16:17:23 sokoban kernel: task:prometheus-node state:D stack:0
pid:1270917 tgid:1270917 ppid:1 flags:0x00000006
> Sep 28 16:17:23 sokoban kernel: Call Trace:
> Sep 28 16:17:23 sokoban kernel:
> Sep 28 16:17:23 sokoban kernel: __schedule+0x3eb/0xb40
> Sep 28 16:17:23 sokoban kernel: schedule+0x27/0xf0
> Sep 28 16:17:23 sokoban kernel: schedule_preempt_disabled+0x15/0x30
> Sep 28 16:17:23 sokoban kernel: __mutex_lock.constprop.0+0x339/0x630
> Sep 28 16:17:23 sokoban kernel: netlink_dump+0x338/0x3b0
> Sep 28 16:17:23 sokoban kernel: __netlink_dump_start+0x1dd/0x2a0
> Sep 28 16:17:23 sokoban kernel: ? __pfx_rtnl_dump_ifinfo+0x10/0x10
> Sep 28 16:17:23 sokoban kernel: rtnetlink_rcv_msg+0x2ac/0x3f0
> Sep 28 16:17:23 sokoban kernel: ? __pfx_rtnl_dumpit+0x10/0x10
> Sep 28 16:17:23 sokoban kernel: ? __pfx_rtnl_dump_ifinfo+0x10/0x10
> Sep 28 16:17:23 sokoban kernel: ? __pfx_rtnetlink_rcv_msg+0x10/0x10
> Sep 28 16:17:23 sokoban kernel: netlink_rcv_skb+0x5b/0x110
> Sep 28 16:17:23 sokoban kernel: netlink_unicast+0x19c/0x290
> Sep 28 16:17:23 sokoban kernel: netlink_sendmsg+0x222/0x490
> Sep 28 16:17:23 sokoban kernel: __sys_sendto+0x1df/0x1f0
> Sep 28 16:17:23 sokoban kernel: __x64_sys_sendto+0x24/0x30
> Sep 28 16:17:23 sokoban kernel: do_syscall_64+0x82/0x190
> Sep 28 16:17:23 sokoban kernel: ? do_syscall_64+0x8e/0x190
> Sep 28 16:17:23 sokoban kernel: ? srso_return_thunk+0x5/0x5f
> Sep 28 16:17:23 sokoban kernel: ? release_sock+0x1d/0xa0
> Sep 28 16:17:23 sokoban kernel: ? srso_return_thunk+0x5/0x5f
[continued in next message]
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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