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From: Wentao Guan <guanwentao@uniontech.com>
To: vincent.mc.li@gmail.com
Cc: alexei.starovoitov@gmail.com, bpf@vger.kernel.org,
	daniel@iogearbox.net, eddyz87@gmail.com,
	loongarch@lists.linux.dev, martin.lau@linux.dev
Subject: Re: bpf selftests timer_lockup intermittently locks up kernel
Date: Mon, 17 Aug 2026 16:47:01 +0800	[thread overview]
Message-ID: <20260817084701.2600044-1-guanwentao@uniontech.com> (raw)
In-Reply-To: <CAK3+h2xOSEZUHhou7N2cRL-aGrZCNSm45g+P7thObMe+fpgYCA@mail.gmail.com>

Hello,

You may try netconsole to capture the crash log:

Reproducer Kernel config:
CONFIG_NETCONSOLE + CONFIG_NETCONSOLE_DYNAMIC=y 

Recv server:
run: nc -u -l -p 6666 | tee /tmp/klog.txt

Reproducer:

1. modprobe netconsole/or y(skip)
2. mount -t configfs none /sys/kernel/config or mounted(skip)
3. mkdir /sys/kernel/config/netconsole/target1
4. cd /sys/kernel/config/netconsole/target1
5. echo 192.168.1.10 > local_ip # 192.168.1.10 is reproducer ip
6. echo 6666 > local_port 
7. echo 6666 > remote_port
8. echo 192.168.1.20 > remote_ip $ recv ip
9. echo 1 > enabled
10. echo 8 > /proc/sys/kernel/printk
11. optional: echo xxx > /dev/kmsg to test 

BRs
Wentao Guan

      parent reply	other threads:[~2026-08-17  8:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-24 18:26 bpf selftests timer_lockup intermittently locks up kernel Vincent Li
2026-08-17  4:04 ` Tiezhu Yang
2026-08-17  4:38   ` Kumar Kartikeya Dwivedi
2026-08-17  8:47 ` Wentao Guan [this message]

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