From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2184AF50F; Tue, 12 Nov 2024 02:24:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731378285; cv=none; b=u4KumY8geQF+BoZAmFlywiRBp85OwaU933qu5yfj24n8UJbjoUnhls8xFBmPJWNg3GIzj+dUJlGyIyQs/4zXo2fvNdXj2HWKfpzQwRIIs2DROmPA84huNCB1b5q74/30pXew4ohc7g2iaFz8Lmbd6nARQwkaorE0ta84nP4Af6M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731378285; c=relaxed/simple; bh=KVKMXh4FE95DmyLC3d/lW+4dH0pIFisXMVeS2B6sp6E=; h=From:To:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=Ko5+RCVNs6/qdFO4VPh0NzOzXqtoSUDoszLo/6ZeylTttR/4OGAUTg5jebBytKKt6bJEiB1btP/ML4DY7Uryl5KdIVZ4kEgkY0yEOWtT9csadlil9fe+x/Ol4ZWju1gdYLavw/UjpeBSBY8PeMrHzKRc4r6DepFof2XdJZKUllU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=bfYxQyaM; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=SQBfM083; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="bfYxQyaM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="SQBfM083" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1731378280; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7IraCr5pUZE8N7jYvVRfjYhiLHWwDnE2AZVmguY66tw=; b=bfYxQyaM6xtTIVfxxTpdJFe9HDFvDRvPhkyFDPZflCDx7MdxsmNvawiJI1msTlQqeU7O9G 8MpkCBWHQ5hs1ywP1Odxao/x1ckYg10k7wzhzjZdFvJm5BDbGtwNReokD3py5xuXIoNYqW HjUMOCiMK6X5G5bqylNV/wk7v6ZG9/PmGqu241VYHFkObn0P3Fp1+XT9zjoT98W5oCAEAi cq1NLXDfdEM5OBCDpMJTtVMfOGwkf5NwoL8i2EtDLbdKHABuOODBCksl00PCedytj0ZV2N imXkfg3hCIzvxdkss+3Ysr4nYhdwC/jcEg+72tlco3Boa8rDoF+tlo26wOeYuA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1731378280; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7IraCr5pUZE8N7jYvVRfjYhiLHWwDnE2AZVmguY66tw=; b=SQBfM083NBEYl8ahu8d9nwOH3//abzVN6ZdXA85A4oHHoFJzfSUIRLNYEr+NKKy+xPDumQ 2iCqn6wLJHMLuQDA== To: syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, frederic@kernel.org, haoluo@google.com, houtao@huaweicloud.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, peterz@infradead.org, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Subject: Re: [syzbot] [bpf?] WARNING: locking bug in trie_delete_elem In-Reply-To: <672d2a52.050a0220.15a23d.01a1.GAE@google.com> References: <672d2a52.050a0220.15a23d.01a1.GAE@google.com> Date: Tue, 12 Nov 2024 03:24:44 +0100 Message-ID: <87bjylnq8j.ffs@tglx> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Thu, Nov 07 2024 at 13:00, syzbot wrote: > syzbot has bisected this issue to: > > commit 4febce44cfebcb490b196d5d10ae9f403ca4c956 > Author: Thomas Gleixner > Date: Tue Oct 1 08:42:03 2024 +0000 > > posix-timers: Cure si_sys_private race > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=129f2d87980000 > start commit: f9f24ca362a4 Add linux-next specific files for 20241031 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=169f2d87980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9 > dashboard link: https://syzkaller.appspot.com/bug?extid=b506de56cbbb63148c33 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1387655f980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ac5540580000 > > Reported-by: syzbot+b506de56cbbb63148c33@syzkaller.appspotmail.com > Fixes: 4febce44cfeb ("posix-timers: Cure si_sys_private race") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection I seriously doubt that this bisection is even remotely correct. This commit has absolutely nothing to do with the lockdep splat and trie_delete_elem(). Thanks, tglx