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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 E5D48C433ED for ; Sat, 3 Apr 2021 08:12:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B06C6611ED for ; Sat, 3 Apr 2021 08:12:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235228AbhDCIMj (ORCPT ); Sat, 3 Apr 2021 04:12:39 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:38420 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231575AbhDCIM2 (ORCPT ); Sat, 3 Apr 2021 04:12:28 -0400 Received: by mail-il1-f200.google.com with SMTP id v2so7002256ilm.5 for ; Sat, 03 Apr 2021 01:12:26 -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=x0tb8aRwBMOB9wEzyPXDOs5wOe4Z+X9201R16LozKKg=; b=rAxgyvLDkSgyHAEsrE837kgBid5QUCAr3MP4j6S7E70vLoYCLVSfH8/IoHeLKJHQkL 608HLk9iUUZqwWYhREaKh7k5PkFuJc8m2dDjqoxPt2LTze6IKzxuJJZLHJNjNlvJwd9X TtEezxE4x8T9eW1ve/w3WA5UKtQZ4rSsWgZbLez/gt+iG5xh+qIW0QvTn/D8aYJLYmWo 0E2yZVXSZpnNxhbiZr+W0ZS7hLPTvPblj+huvm/UaqaOJ4IZTqnuUoLkM0/+38Svn+JP 0yNPmh6EzMLPnirupERwX6JYbeoF6TbheK214P/s29RBiYwlh7c7vKXrkzp5SwguYm+G pksQ== X-Gm-Message-State: AOAM530PjVg8KUv7Bk93y8zx4edfSFJhjdSSfxbm0NxyHehqqUt4N+JN /tEukpOXfpMRQphcBPd1KckdOMuP2flC8ql69ljTuqilkWnf X-Google-Smtp-Source: ABdhPJzuRQ/wN0qL1tGnfDgnztvoA2/kLcpzKz/2keSm7ccJneA32WTtYyQ3CoKWw3CRg8Qn5gtf3MYxMakDIHHQnIn17e5ZEmmG MIME-Version: 1.0 X-Received: by 2002:a5e:8610:: with SMTP id z16mr13232111ioj.57.1617437546427; Sat, 03 Apr 2021 01:12:26 -0700 (PDT) Date: Sat, 03 Apr 2021 01:12:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000066b6f405bf0d0660@google.com> Subject: [syzbot] WARNING: suspicious RCU usage in __schedule From: syzbot To: broonie@kernel.org, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, mbenes@suse.cz, syzkaller-bugs@googlegroups.com, will@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: 1e43c377 Merge tag 'xtensa-20210329' of git://github.com/j.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1432bd1ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=78a83786814e7724 dashboard link: https://syzkaller.appspot.com/bug?extid=be81a058b10931003a4a userspace arch: arm 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+be81a058b10931003a4a@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 5.12.0-rc5-syzkaller-00003-g1e43c377a79f #0 Not tainted ----------------------------- kernel/sched/core.c:4841 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 migration/1/17. stack backtrace: CPU: 1 PID: 17 Comm: migration/1 Not tainted 5.12.0-rc5-syzkaller-00003-g1e43c377a79f #0 Hardware name: linux,dummy-virt (DT) Stopper: 0x0 <- 0x0 Call trace: dump_backtrace+0x0/0x3e0 arch/arm64/include/asm/pointer_auth.h:76 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:191 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x120/0x1a8 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x130/0x148 kernel/locking/lockdep.c:6428 schedule_debug kernel/sched/core.c:4841 [inline] __schedule+0x1244/0x1bc4 kernel/sched/core.c:4967 schedule+0xac/0x22c kernel/sched/core.c:5152 smpboot_thread_fn+0x278/0x7f4 kernel/smpboot.c:161 kthread+0x320/0x3bc kernel/kthread.c:292 ret_from_fork+0x10/0x3c arch/arm64/kernel/entry.S:958 --- 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.