Re: [syzbot] [net] INFO: rcu detected stall in sys_close (5)

Re: [syzbot] [net] INFO: rcu detected stall in sys_close (5)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+e46fbd5289363464bc13@syzkaller.appspotmail.com

Tested on:

commit:         1c59d383 Merge tag 'linux-kselftest-nolibc-6.6-rc1' of..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1469ebb7a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9678e210dd5e4a5f
dashboard link: https://syzkaller.appspot.com/bug?extid=e46fbd5289363464bc13
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12df4c8fa80000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net] INFO: rcu detected stall in sys_close (5)

[syzbot]

syzbot has bisected this issue to:

commit ec97ecf1ebe485a17cd8395a5f35e6b80b57665a
Author: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Date:   Wed Jan 22 18:22:33 2020 +0000

    net: sched: add Flow Queue PIE packet scheduler

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101bb718680000
start commit:   727dbda16b83 Merge tag 'hardening-v6.6-rc1' of git://git.k..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=121bb718680000
console output: https://syzkaller.appspot.com/x/log.txt?x=141bb718680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45047a5b8c295201
dashboard link: https://syzkaller.appspot.com/bug?extid=e46fbd5289363464bc13
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14780797a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17c1fc9fa80000

Reported-by: syzbot+e46fbd5289363464bc13@syzkaller.appspotmail.com
Fixes: ec97ecf1ebe4 ("net: sched: add Flow Queue PIE packet scheduler")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: [syzbot] [net] INFO: rcu detected stall in sys_close (5)

[Eric Dumazet]

On Wed, Aug 30, 2023 at 12:57 AM syzbot
<syzbot+e46fbd5289363464bc13@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit ec97ecf1ebe485a17cd8395a5f35e6b80b57665a
> Author: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
> Date:   Wed Jan 22 18:22:33 2020 +0000
>
>     net: sched: add Flow Queue PIE packet scheduler
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101bb718680000
> start commit:   727dbda16b83 Merge tag 'hardening-v6.6-rc1' of git://git.k..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=121bb718680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=141bb718680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=45047a5b8c295201
> dashboard link: https://syzkaller.appspot.com/bug?extid=e46fbd5289363464bc13
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14780797a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17c1fc9fa80000
>
> Reported-by: syzbot+e46fbd5289363464bc13@syzkaller.appspotmail.com
> Fixes: ec97ecf1ebe4 ("net: sched: add Flow Queue PIE packet scheduler")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Yeah, I figured that out, and sent :

https://patchwork.kernel.org/project/netdevbpf/patch/20230829123541.3745013-1-edumazet@google.com/