From nobody Mon Feb 9 05:53:13 2026 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C52D261B75 for ; Tue, 21 Oct 2025 09:53:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761040399; cv=none; b=Ld97KvjuBpiX/eN3x2R3zHJEFW2Yl48Khf3zD1BCWZbQiidq2kjmsrYkhORPP5zkgiL6O4RifBOJOf03XmGI3SCZkTlygNW9PT79iSLe/df1TuY23hNTBopRdtW+fDw4ggnybj2lm+POpqiOSbGc3bW6TYHj8Emx6nT+QyDtRuc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761040399; c=relaxed/simple; bh=NSSFFadB6T/heygUc17E1yzcyP9oFXhkRb9EfAlCiZw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=TgXWUtLJ7vqF90SORQhkDZ1TnE9uxPg+e67HgtqtIz5kNw24FW+kTFZqH6eFsLQlIAfBDQHYryNaX07Ixyn8fX0GGy/tc6GaK9+38QNoJEw3txQ5N+5wWOWFyBPswHK5ZAYvWjiDjQXcOwT6NkdytcwmD6qVYE4qBXm5G+DGWTs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f79.google.com with SMTP id ca18e2360f4ac-940d395fd10so718728839f.1 for ; Tue, 21 Oct 2025 02:53:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761040397; x=1761645197; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Om/NSOIxTN20TSkGJycUFW+bNm/1D3MvjGtvk5SMTrs=; b=JxNvUp43gbbNDaP0U0tSPzX5lJdg5+k2iU/+yaneZWqltkXYNoNmouYqtbwgfl5jXp oC7e4Fp/4esLcJAKZZDmZ+EmXDczE2GbAa/6POnHuUdFWFfJrf7YZWZKM5EshhfBh/NP T4u9kBN4gq6LUoyRDM1pz9f3ExjNKQZfggEpVQ83Tyj6AjTrNNLmM4AdLdskHLRtbJv5 p79kx7qHumrw8amsQ7HfIMbdV7MloHrTUAGxsRkVNNwVQNtR/f44kWZa0sEkZjRzyL0L CDibrEJ+69E2WCcJz6kTxypMNAqamCSwMY9VYL8+cuUV6ZTzIQe3RfSM4AChGOrKzngI JGSw== X-Gm-Message-State: AOJu0Yw1n436711Y9BnJLYWKYAq/5Nvf4FL26sv6NcpqiEdqTam0PXQd HUfXgx8ppVuF2z007axnzWRU1hsrOCwH8ZuOMyg5C+dcwzY5dFXacxjSCkrwVYhghUVfTqVyyzV zoLcG4SndlCGpk1+F9zX4/bFdG+iS3pTuOtSWer50x1KIRyxRfELd7PgO4wF9eg== X-Google-Smtp-Source: AGHT+IGlUKIuISb9G86JK7B90ABNJ68+3nlq9IJmPL0+Y2qkmlVPsHOT7bBtSjuhKG9WEuKJBfwgbsBd2QpGCkvURQQ0DuMeSzwj Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:60cd:b0:93e:8a05:5f3b with SMTP id ca18e2360f4ac-93e8a05632dmr1757744439f.13.1761040397533; Tue, 21 Oct 2025 02:53:17 -0700 (PDT) Date: Tue, 21 Oct 2025 02:53:17 -0700 In-Reply-To: <68f6a4c8.050a0220.1be48.0011.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f7580d.050a0220.346f24.000b.GAE@google.com> Subject: Forwarded: Re: [syzbot] [bpf?] WARNING in bpf_bprintf_prepare (3) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [bpf?] WARNING in bpf_bprintf_prepare (3) Author: listout@listout.xyz On 20.10.2025 14:08, syzbot wrote: > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: a1e83d4c0361 selftests/bpf: Fix redefinition of 'off' as = d.. > git tree: bpf > console output: https://syzkaller.appspot.com/x/log.txt?x=3D12d21de2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D9ad7b090a1865= 4a7 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db0cff308140f79a= 9c4cb > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b797= 6-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D160cf542580= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D128d5c58580000 >=20 > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/2f6a7a0cd1b7/dis= k-a1e83d4c.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/873984cfc71e/vmlinu= x-a1e83d4c.xz > kernel image: https://storage.googleapis.com/syzbot-assets/16711d84070c/b= zImage-a1e83d4c.xz >=20 > The issue was bisected to: >=20 > commit 7c33e97a6ef5d84e98b892c3e00c6d1678d20395 > Author: Sahil Chandna > Date: Tue Oct 14 18:56:35 2025 +0000 >=20 > bpf: Do not disable preemption in bpf_test_run(). >=20 > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D172fe49258= 0000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D14afe49258= 0000 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D10afe492580000 >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+b0cff308140f79a9c4cb@syzkaller.appspotmail.com > Fixes: 7c33e97a6ef5 ("bpf: Do not disable preemption in bpf_test_run().") #syz test diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 8b7d0b90fea7..1d0047073eda 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -36,7 +36,7 @@ struct bpf_test_timer { static void bpf_test_timer_enter(struct bpf_test_timer *t) __acquires(rcu) { - rcu_read_lock_dont_migrate(); + migrate_disable(); t->time_start =3D ktime_get_ns(); } =20 @@ -44,7 +44,8 @@ static void bpf_test_timer_leave(struct bpf_test_timer *t) __releases(rcu) { t->time_start =3D 0; - rcu_read_unlock_migrate(); + migrate_enable(); + rcu_read_unlock(); } =20 static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iteratio= ns, --=20 Regards, listout