From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B061CC33CB1 for ; Fri, 17 Jan 2020 09:39:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E62920730 for ; Fri, 17 Jan 2020 09:39:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729121AbgAQJjM (ORCPT ); Fri, 17 Jan 2020 04:39:12 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:39369 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728596AbgAQJjL (ORCPT ); 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2002:a92:88d0:: with SMTP id m77mr2373438ilh.9.1579253950789; Fri, 17 Jan 2020 01:39:10 -0800 (PST) Date: Fri, 17 Jan 2020 01:39:10 -0800 In-Reply-To: <0000000000003e5aa90598ed7415@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bf411c059c52b660@google.com> Subject: Re: BUG: sleeping function called from invalid context in lock_sock_nested From: syzbot To: andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, eric.dumazet@gmail.com, herbert@gondor.apana.org.au, john.fastabend@gmail.com, kafai@fb.com, linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, yhs@fb.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 93ad0f96 net: wan: lapbether.c: Use built-in RCU list chec.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=1159eb8ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7e89bd00623fe71e dashboard link: https://syzkaller.appspot.com/bug?extid=c2f1558d49e25cc36e5e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1070cad1e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17de84a5e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c2f1558d49e25cc36e5e@syzkaller.appspotmail.com BUG: sleeping function called from invalid context at net/core/sock.c:2935 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3198, name: kworker/0:112 4 locks held by kworker/0:112/3198: #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2235 #1: ffffc9000951fdc0 ((work_completion)(&map->work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2239 #2: ffffffff899a3f00 (rcu_read_lock){....}, at: sock_hash_free+0x0/0x540 net/core/sock_map.c:317 #3: ffffc90002478d20 (&htab->buckets[i].lock){+...}, at: sock_hash_free+0x131/0x540 net/core/sock_map.c:865 Preemption disabled at: [] sock_hash_free+0x131/0x540 net/core/sock_map.c:865 CPU: 0 PID: 3198 Comm: kworker/0:112 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events bpf_map_free_deferred Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1fb/0x23e kernel/sched/core.c:6800 __might_sleep+0x95/0x190 kernel/sched/core.c:6753 lock_sock_nested+0x39/0x120 net/core/sock.c:2935 lock_sock include/net/sock.h:1531 [inline] sock_hash_free+0x29f/0x540 net/core/sock_map.c:868 bpf_map_free_deferred+0xb3/0x100 kernel/bpf/syscall.c:327 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 BUG: scheduling while atomic: kworker/0:112/3198/0x00000202 4 locks held by kworker/0:112/3198: #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2235 #1: ffffc9000951fdc0 ((work_completion)(&map->work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2239 #2: ffffffff899a3f00 (rcu_read_lock){....}, at: sock_hash_free+0x0/0x540 net/core/sock_map.c:317 #3: ffffc90002478d20 (&htab->buckets[i].lock){+...}, at: sock_hash_free+0x131/0x540 net/core/sock_map.c:865 Modules linked in: Preemption disabled at: [] sock_hash_free+0x131/0x540 net/core/sock_map.c:865