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, URIBL_BLOCKED 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 8CF35C3F2CE for ; Thu, 5 Mar 2020 02:15:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B99420842 for ; Thu, 5 Mar 2020 02:15:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725938AbgCECPN (ORCPT ); Wed, 4 Mar 2020 21:15:13 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:42639 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725797AbgCECPN (ORCPT ); Wed, 4 Mar 2020 21:15:13 -0500 Received: by mail-il1-f197.google.com with SMTP id 142so3343544ilc.9 for ; Wed, 04 Mar 2020 18:15:12 -0800 (PST) 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=KosNoMY9v17iDXcHTJBpDff1UGW+eB08bYAxxRTDr4w=; b=jnxomXQw8wZFQgUglDXnrrVtMU24n76RMm8Nscdp4mmXj27E8DA0KQmBqP+RCYJGes 1gotNtUmxf6zdioXYUNL8q1YKM9UpNP2ajszJllnqQh9E1ec0ZL7MNxUkpWKKqWymvLr i8/+818pXrrBbqcV9d4aIq71rnolHK1klZZcl4rpZjTAUIRF3adxMTnKMnIKU+rZgmuE h2uqu2SH+AWDGHkHMUOtF3q4hCBYz3c3e/we8D7GTn8/omQ5didezItMS5MdKSx9t4ST 4dqYggkGiuihZ2l6tOWEcyyuY6fUw/fqtSGb900WxNUqEWd9k9vse228Mm6lDSwCTKY3 E+Uw== X-Gm-Message-State: ANhLgQ3Aonm/p045i4TxLLeq4iGJXfbWd8tyWxAlK9wAylJPEfrOt7qQ GXtFqF+L8vsC3ItVW7z/Hb682d1b9F+qgr79uxb9Jrx1JaK5 X-Google-Smtp-Source: ADFU+vsYJrUQjDBgJFlBKDBKJz9xhrZVbcp0HALhImbeGn7/IPIYMCJhCT9mv2aPc0njJ/aGptKhckCzS56BX425CN+2WQBvwOZ5 MIME-Version: 1.0 X-Received: by 2002:a92:1310:: with SMTP id 16mr6027477ilt.45.1583374512443; Wed, 04 Mar 2020 18:15:12 -0800 (PST) Date: Wed, 04 Mar 2020 18:15:12 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005c66c305a0121be1@google.com> Subject: BUG: sleeping function called from invalid context in do_page_fault From: syzbot To: bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: f8788d86 Linux 5.6-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16c2fd29e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9833e26bab355358 dashboard link: https://syzkaller.appspot.com/bug?extid=7f59c1e54e5ce4d95cf7 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7f59c1e54e5ce4d95cf7@syzkaller.appspotmail.com BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1400 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 4262, name: udevd 1 lock held by udevd/4262: #0: ffff888093e19518 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1383 [inline] #0: ffff888093e19518 (&mm->mmap_sem#2){++++}, at: do_page_fault+0x34b/0x12e1 arch/x86/mm/fault.c:1517 irq event stamp: 5474812 hardirqs last enabled at (5474811): [] kmem_cache_free+0x98/0x320 mm/slab.c:3695 hardirqs last disabled at (5474812): [] syscall_return_slowpath arch/x86/entry/common.c:277 [inline] hardirqs last disabled at (5474812): [] do_syscall_64+0x20a/0x790 arch/x86/entry/common.c:304 softirqs last enabled at (5473952): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319 softirqs last disabled at (5473911): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (5473911): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 CPU: 1 PID: 4262 Comm: udevd Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:6798 __might_sleep+0x95/0x190 kernel/sched/core.c:6751 do_user_addr_fault arch/x86/mm/fault.c:1400 [inline] do_page_fault+0x378/0x12e1 arch/x86/mm/fault.c:1517 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0010:prepare_exit_to_usermode arch/x86/entry/common.c:189 [inline] RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:278 [inline] RIP: 0010:do_syscall_64+0x2c9/0x790 arch/x86/entry/common.c:304 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc900015d7f20 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888093e16640 RCX: ffffffff8100a857 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc900015d7f48 R08: ffff888093e16640 R09: ffffed10127c2cc9 R10: ffffed10127c2cc8 R11: ffff888093e16647 R12: ffffc900015d7f58 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.