From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qa0-f44.google.com (mail-qa0-f44.google.com [209.85.216.44]) by kanga.kvack.org (Postfix) with ESMTP id 3AB9A6B0035 for ; Tue, 5 Aug 2014 04:33:18 -0400 (EDT) Received: by mail-qa0-f44.google.com with SMTP id f12so589871qad.17 for ; Tue, 05 Aug 2014 01:33:18 -0700 (PDT) Received: from mail-qg0-f45.google.com (mail-qg0-f45.google.com [209.85.192.45]) by mx.google.com with ESMTPS id g35si1581441qgf.104.2014.08.05.01.33.17 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 05 Aug 2014 01:33:17 -0700 (PDT) Received: by mail-qg0-f45.google.com with SMTP id f51so626393qge.32 for ; Tue, 05 Aug 2014 01:33:17 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20140804103025.478913141@infradead.org> References: <20140804103025.478913141@infradead.org> Date: Tue, 5 Aug 2014 12:33:16 +0400 Message-ID: Subject: Re: [RFC][PATCH 0/7] nested sleeps, fixes and debug infra From: Ilya Dryomov Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Peter Zijlstra Cc: Ingo Molnar , oleg@redhat.com, Linus Torvalds , tglx@linutronix.de, Mike Galbraith , Linux Kernel Mailing List , netdev@vger.kernel.org, linux-mm@kvack.org On Mon, Aug 4, 2014 at 2:30 PM, Peter Zijlstra wrote: > Hi, > > Ilya recently tripped over a nested sleep which made Ingo suggest we should > have debug checks for that. So I did some, see patch 7. Of course that > triggered a whole bunch of fail the instant I tried to boot my machine. > > With this series I can boot my test box and build a kernel on it, I'm fairly > sure that's far too limited a test to have found all, but its a start. FWIW, I'm getting a lot of these during light rbd testing. CC'ed netdev and linux-mm. WARNING: CPU: 2 PID: 1978 at kernel/sched/core.c:7094 __might_sleep+0x5b/0x1e0() do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait+0x50/0xa0 Modules linked in: CPU: 2 PID: 1978 Comm: ceph-osd Not tainted 3.16.0-vm+ #109 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 0000000000001bb6 ffff8800126739e8 ffffffff8156ec1d 0000000000000000 ffff880012673a38 ffff880012673a28 ffffffff81032c27 ffff880012673a58 0000000000000200 ffff8800150fa060 00000000000007ad ffffffff817ed352 Call Trace: [] dump_stack+0x4f/0x7c [] warn_slowpath_common+0x87/0xb0 [] warn_slowpath_fmt+0x41/0x50 [] ? tcp_v4_do_rcv+0x10f/0x4a0 [] ? prepare_to_wait+0x50/0xa0 [] ? prepare_to_wait+0x50/0xa0 [] __might_sleep+0x5b/0x1e0 [] release_sock+0x13d/0x200 [] sk_stream_wait_memory+0x133/0x2d0 [] ? woken_wake_function+0x10/0x10 [] tcp_sendmsg+0xb6f/0xd70 [] inet_sendmsg+0xdf/0x100 [] ? inet_recvmsg+0x100/0x100 [] sock_sendmsg+0x67/0x90 [] ? might_fault+0x51/0xb0 [] ___sys_sendmsg+0x2d2/0x2e0 [] ? futex_wake+0x128/0x140 [] ? futex_wake+0x1/0x140 [] ? do_dup2+0xd0/0xd0 [] ? get_parent_ip+0x11/0x50 [] ? debug_smp_processor_id+0x17/0x20 [] ? delay_tsc+0x85/0xb0 [] ? __fget+0xdd/0xf0 [] ? do_dup2+0xd0/0xd0 [] ? __fget_light+0x45/0x60 [] ? __fdget+0xe/0x10 [] __sys_sendmsg+0x44/0x70 [] SyS_sendmsg+0x9/0x10 [] system_call_fastpath+0x16/0x1b WARNING: CPU: 0 PID: 380 at kernel/sched/core.c:7094 __might_sleep+0x5b/0x1e0() do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait+0x50/0xa0 Modules linked in: CPU: 0 PID: 380 Comm: kswapd0 Tainted: G W 3.16.0-vm+ #109 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 0000000000001bb6 ffff88007b64bc68 ffffffff8156ec1d 0000000000000000 ffff88007b64bcb8 ffff88007b64bca8 ffffffff81032c27 0000000000000000 0000000000000000 ffff88007c062060 0000000000000065 ffffffff8179ca1f Call Trace: [] dump_stack+0x4f/0x7c [] warn_slowpath_common+0x87/0xb0 [] warn_slowpath_fmt+0x41/0x50 [] ? prepare_to_wait+0x50/0xa0 [] ? prepare_to_wait+0x50/0xa0 [] __might_sleep+0x5b/0x1e0 [] __reset_isolation_suitable+0x83/0x140 [] reset_isolation_suitable+0x33/0x50 [] kswapd+0x2e7/0x4d0 [] ? woken_wake_function+0x10/0x10 [] ? balance_pgdat+0x5b0/0x5b0 [] kthread+0xfb/0x110 [] ? flush_kthread_worker+0x130/0x130 [] ret_from_fork+0x7c/0xb0 [] ? flush_kthread_worker+0x130/0x130 Thanks, Ilya -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org