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=-3.7 required=3.0 tests=BAYES_00,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 8EAEAC48BD1 for ; Fri, 11 Jun 2021 12:01:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6AF58613BA for ; Fri, 11 Jun 2021 12:01:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231425AbhFKMDc (ORCPT ); Fri, 11 Jun 2021 08:03:32 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:39453 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230370AbhFKMDb (ORCPT ); Fri, 11 Jun 2021 08:03:31 -0400 Received: by mail-io1-f72.google.com with SMTP id n1-20020a6b8b010000b02904be419d64eeso8863113iod.6 for ; Fri, 11 Jun 2021 05:01:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=3h3zYX7S/XU1pNnyF7wjc3S3Ti3iJgcXhX6UDGf6V8M=; b=BjqK43AlW6+zEJL4WrJ7FiluV/eojBtZHFXfVcJl9A9m1rn9mjDUlGKZ21yoaqZvVK 79g9jc2QkeG/MPbXhx2g99aEVn2PCx5EnuAECIuLMBBrHZEP5xEatHCIX0X8xlco9VSA A/fnNbMnPSPyp4nypYnDIGNEk49z+leKtoiMgtjOZQmopu5Ed5MgkB/sXjuR2t//qp/4 D1o6rcJN4uwXGar5M0d5FmjqQrD7ZrhDcukswWgEkEfRZ61lFuaunJn0SuSy6cs7BXR/ ABJFI7Q2xIqYaL1aEsk2Wv41MAD2ItbmLQOW11MWGPkNT7A+gZs0R8Zvl5hzRnr2WDm3 GS/Q== X-Gm-Message-State: AOAM532FeEybUSg5Rjhl25DflPisXWRBeC3Y+zdJgbulbDJJtn++vCtF P86hdsAl3IcCIciW9t0IO4nkd3GWQITkrI+yv9bhtQEU8gD/ X-Google-Smtp-Source: ABdhPJw4UJ7yns8oXn/uH/8mm0acq+gRxMXvWTotY8C21asQzDdGsoZ6dibrP2HT7+KWX0GR29/uSNB9tpX5d8f4zMjDRRV5bEig MIME-Version: 1.0 X-Received: by 2002:a92:7c02:: with SMTP id x2mr2979702ilc.8.1623412878113; Fri, 11 Jun 2021 05:01:18 -0700 (PDT) Date: Fri, 11 Jun 2021 05:01:18 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ec812705c47c4342@google.com> Subject: [syzbot] WARNING: suspicious RCU usage in kernfs_iop_get_link From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 614124be Linux 5.13-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12a6cdbbd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=30f476588412c065 dashboard link: https://syzkaller.appspot.com/bug?extid=9fa589353c6e1587c6b3 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9fa589353c6e1587c6b3@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 5.13.0-rc5-syzkaller #0 Not tainted ----------------------------- kernel/sched/core.c:8304 Illegal context switch in RCU-sched read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 0 no locks held by systemd-udevd/13755. stack backtrace: CPU: 0 PID: 13755 Comm: systemd-udevd Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep+0x266/0x2c0 kernel/sched/core.c:8304 might_alloc include/linux/sched/mm.h:201 [inline] slab_pre_alloc_hook mm/slab.h:497 [inline] slab_alloc_node mm/slub.c:2834 [inline] slab_alloc mm/slub.c:2921 [inline] kmem_cache_alloc_trace+0x277/0x2c0 mm/slub.c:2938 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [inline] kernfs_iop_get_link fs/kernfs/symlink.c:135 [inline] kernfs_iop_get_link+0x61/0x6e0 fs/kernfs/symlink.c:126 pick_link fs/namei.c:1741 [inline] step_into+0x168e/0x1c80 fs/namei.c:1798 open_last_lookups fs/namei.c:3308 [inline] path_openat+0x491/0x27e0 fs/namei.c:3491 do_filp_open+0x190/0x3d0 fs/namei.c:3521 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0ff9316840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffeb81b55a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000701 RCX: 00007f0ff9316840 RDX: 0000000000000001 RSI: 0000000000080000 RDI: 00007ffeb81b55b0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000012 R10: 0000000000000064 R11: 0000000000000246 R12: 00007ffeb81b6600 R13: 00007ffeb81b7690 R14: 0000000000000000 R15: 0000000000000000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.