From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f178.google.com ([209.85.213.178]:34860 "EHLO mail-ig0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751394AbbKIN0E (ORCPT ); Mon, 9 Nov 2015 08:26:04 -0500 Received: by igl9 with SMTP id 9so30129748igl.0 for ; Mon, 09 Nov 2015 05:26:02 -0800 (PST) Subject: Re: Process is blocked for more than 120 seconds To: Dmitry Katsubo , linux-btrfs References: <56374C7D.5080609@mail.ru> <563DECF0.8080901@mail.ru> From: Austin S Hemmelgarn Message-ID: <56409EE4.6070605@gmail.com> Date: Mon, 9 Nov 2015 08:25:56 -0500 MIME-Version: 1.0 In-Reply-To: <563DECF0.8080901@mail.ru> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms080102040301000505060401" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms080102040301000505060401 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-11-07 07:22, Dmitry Katsubo wrote: > Hi everyone, > > I have noticed the following in the log. The system continues to run, > but I am not sure for how long it will be stable. Should I start > worrying? Thanks in advance for the opinion. > This just means that a process was stuck in the D state (uninterruptible = I/O sleep) for more than 120 seconds. Depending on a number of factors, = this happening could mean: 1. Absolutely nothing (if you have low-powered or older hardware, for=20 example, I get these regularly on a first generation Raspberry Pi if I=20 don't increase the timeout significantly) 2. The program is doing a very large chunk of I/O (usually with the=20 O_DIRECT flag, although this probably isn't the case here) 3. There's a bug in the blocked program (this is rarely the case when=20 this type of thing happens) 4. There's a bug in the kernel (which is why this dumps a stack trace) 5. The filesystem itself is messed up somehow, and the kernel isn't=20 handling it properly (technically a bug, but a more specific case of it).= 6. You're hardware is misbehaving, failing, or experienced a transient=20 error. Assuming you can rule out possibilities 1 and 6, I think that 4 is the=20 most likely cause, as all of the listed programs (I'm assuming that=20 'master' is from postfix) are relatively well audited, and all of them=20 hit this at the same time. For what it's worth, if you want you can do: echo 0 > /proc/sys/kernel/hung_task_timeout_secs like the message says to stop these from appearing in the future, or use = some arbitrary number to change the timeout before these messages appear = (I usually use at least 150 on production systems, and more often 300,=20 although on something like a Raspberry Pi I often use timeouts as high=20 as 1800 seconds). >> [Mon Nov 2 06:35:57 2015] INFO: task nscd:859 blocked for more than 1= 20 seconds. >> [Mon Nov 2 06:35:57 2015] Not tainted 4.2.0-0.bpo.1-686-pae #1 >> [Mon Nov 2 06:35:57 2015] "echo 0 > /proc/sys/kernel/hung_task_timeou= t_secs" disables this message. >> [Mon Nov 2 06:35:57 2015] nscd D f1c7dd20 0 859 = 1 0x00000000 >> [Mon Nov 2 06:35:57 2015] f1c7dd40 00200082 f79de900 f1c7dd20 c10bc1= 19 ffffffe0 f3aec740 00200246 >> [Mon Nov 2 06:35:57 2015] f74ea800 f79e3f40 f77fb800 f1c7e000 f6b381= dc f6b38000 f1c7dd4c c14f1fdb >> [Mon Nov 2 06:35:57 2015] d5553960 f1c7dd70 f867672f 00000000 f77fb8= 00 c1099250 d0a4be08 d9755e68 >> [Mon Nov 2 06:35:57 2015] Call Trace: >> [Mon Nov 2 06:35:57 2015] [] ? del_timer_sync+0x49/0x50 >> [Mon Nov 2 06:35:57 2015] [] ? schedule+0x2b/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? wait_current_trans.isra.21+= 0x8f/0xf0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? wait_woken+0x80/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? start_transaction+0x3d0/0x5= d0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_delalloc_reserve_meta= data+0x32d/0x580 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0xb0/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_join_transaction+0x23= /0x30 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0x39/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0xb0/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? file_update_time+0x7e/0xc0 >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_page_mkwrite+0x80/0x3= c0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? hrtimer_cancel+0x19/0x20 >> [Mon Nov 2 06:35:57 2015] [] ? futex_wait+0x1e1/0x270 >> [Mon Nov 2 06:35:57 2015] [] ? do_page_mkwrite+0x38/0x90 >> [Mon Nov 2 06:35:57 2015] [] ? do_wp_page+0x2e2/0x6d0 >> [Mon Nov 2 06:35:57 2015] [] ? futex_wake+0x71/0x140 >> [Mon Nov 2 06:35:57 2015] [] ? kmap_atomic_prot+0xe7/0x110= >> [Mon Nov 2 06:35:57 2015] [] ? handle_mm_fault+0xd59/0x14d= 0 >> [Mon Nov 2 06:35:57 2015] [] ? __do_page_fault+0x18c/0x480= >> [Mon Nov 2 06:35:57 2015] [] ? __do_page_fault+0x480/0x480= >> [Mon Nov 2 06:35:57 2015] [] ? error_code+0x67/0x6c >> [Mon Nov 2 06:35:57 2015] INFO: task nscd:864 blocked for more than 1= 20 seconds. >> [Mon Nov 2 06:35:57 2015] Not tainted 4.2.0-0.bpo.1-686-pae #1 >> [Mon Nov 2 06:35:57 2015] "echo 0 > /proc/sys/kernel/hung_task_timeou= t_secs" disables this message. >> [Mon Nov 2 06:35:57 2015] nscd D f1c87f5c 0 864 = 1 0x00000000 >> [Mon Nov 2 06:35:57 2015] f1c87ef4 00200082 f1c87f80 f1c87f5c 000003= e7 f1c87ee4 f3aec740 ac76c560 >> [Mon Nov 2 06:35:57 2015] f74ea800 f79e3f40 f3c7b040 f1c88000 f3c7b0= 40 ffff0001 f1c87f00 c14f1fdb >> [Mon Nov 2 06:35:57 2015] f3aec77c f1c87f38 c14f4265 f1c87f1c f3aec7= 80 f3aec788 00000000 00000125 >> [Mon Nov 2 06:35:57 2015] Call Trace: >> [Mon Nov 2 06:35:57 2015] [] ? schedule+0x2b/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? rwsem_down_write_failed+0x1= 85/0x280 >> [Mon Nov 2 06:35:57 2015] [] ? call_rwsem_down_write_faile= d+0x6/0x8 >> [Mon Nov 2 06:35:57 2015] [] ? down_write+0x25/0x40 >> [Mon Nov 2 06:35:57 2015] [] ? vm_mmap_pgoff+0x4a/0xa0 >> [Mon Nov 2 06:35:57 2015] [] ? SyS_fstat64+0x28/0x30 >> [Mon Nov 2 06:35:57 2015] [] ? SyS_mmap_pgoff+0x110/0x210 >> [Mon Nov 2 06:35:57 2015] [] ? sysenter_do_call+0x12/0x12 >> [Mon Nov 2 06:35:57 2015] INFO: task nmbd:1330 blocked for more than = 120 seconds. >> [Mon Nov 2 06:35:57 2015] Not tainted 4.2.0-0.bpo.1-686-pae #1 >> [Mon Nov 2 06:35:57 2015] "echo 0 > /proc/sys/kernel/hung_task_timeou= t_secs" disables this message. >> [Mon Nov 2 06:35:57 2015] nmbd D 00000000 0 1330 = 1 0x00000000 >> [Mon Nov 2 06:35:57 2015] ef44bd74 00200086 00000000 00000000 000000= 00 00000000 f3984900 00000000 >> [Mon Nov 2 06:35:57 2015] f69e1800 f79e3f40 f3a7a800 ef44c000 d17255= a0 d17255a0 ef44bd80 c14f1fdb >> [Mon Nov 2 06:35:57 2015] d1725600 ef44bdc8 f86961b5 000d3fff 000000= 00 00001000 00000000 000d3000 >> [Mon Nov 2 06:35:57 2015] Call Trace: >> [Mon Nov 2 06:35:57 2015] [] ? schedule+0x2b/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_start_ordered_extent+= 0xd5/0x100 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? wait_woken+0x80/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? lock_and_cleanup_extent_if_= need+0x134/0x260 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? prepare_pages+0xc6/0x150 [b= trfs] >> [Mon Nov 2 06:35:57 2015] [] ? __btrfs_buffered_write+0x17= a/0x5e0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? __alloc_pages_nodemask+0x13= 3/0x880 >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_file_write_iter+0x1e5= /0x550 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? page_add_new_anon_rmap+0x6c= /0x90 >> [Mon Nov 2 06:35:57 2015] [] ? new_sync_write+0x79/0xb0 >> [Mon Nov 2 06:35:57 2015] [] ? vfs_write+0x93/0x1a0 >> [Mon Nov 2 06:35:57 2015] [] ? __do_page_fault+0x1a8/0x480= >> [Mon Nov 2 06:35:57 2015] [] ? mutex_lock+0x10/0x30 >> [Mon Nov 2 06:35:57 2015] [] ? SyS_write+0x46/0x90 >> [Mon Nov 2 06:35:57 2015] [] ? sysenter_do_call+0x12/0x12 >> [Mon Nov 2 06:35:57 2015] INFO: task master:2321 blocked for more tha= n 120 seconds. >> [Mon Nov 2 06:35:57 2015] Not tainted 4.2.0-0.bpo.1-686-pae #1 >> [Mon Nov 2 06:35:57 2015] "echo 0 > /proc/sys/kernel/hung_task_timeou= t_secs" disables this message. >> [Mon Nov 2 06:35:57 2015] master D f79e3f40 0 2321 = 1 0x00000004 >> [Mon Nov 2 06:35:57 2015] edcd9e18 00200082 cb7fd040 f79e3f40 cb7fd0= 40 ffffffe0 f3903c80 00200246 >> [Mon Nov 2 06:35:57 2015] c167cb00 f79d1f40 eef44800 edcda000 f6b381= dc f6b38000 edcd9e24 c14f1fdb >> [Mon Nov 2 06:35:57 2015] d5553960 edcd9e48 f867672f 00000000 eef448= 00 c1099250 f3309e68 c7a17d64 >> [Mon Nov 2 06:35:57 2015] Call Trace: >> [Mon Nov 2 06:35:57 2015] [] ? schedule+0x2b/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? wait_current_trans.isra.21+= 0x8f/0xf0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? wait_woken+0x80/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? start_transaction+0x3d0/0x5= d0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0xb0/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_join_transaction+0x23= /0x30 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0x39/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_dirty_inode+0xb0/0xb0= [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? file_update_time+0x7e/0xc0 >> [Mon Nov 2 06:35:57 2015] [] ? pipe_write+0x32a/0x400 >> [Mon Nov 2 06:35:57 2015] [] ? new_sync_write+0x79/0xb0 >> [Mon Nov 2 06:35:57 2015] [] ? vfs_write+0x93/0x1a0 >> [Mon Nov 2 06:35:57 2015] [] ? poll_select_set_timeout+0x6= 8/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? SyS_write+0x46/0x90 >> [Mon Nov 2 06:35:57 2015] [] ? sysenter_do_call+0x12/0x12 >> [Mon Nov 2 06:35:57 2015] INFO: task xfce4-sensors-p:2611 blocked for= more than 120 seconds. >> [Mon Nov 2 06:35:57 2015] Not tainted 4.2.0-0.bpo.1-686-pae #1 >> [Mon Nov 2 06:35:57 2015] "echo 0 > /proc/sys/kernel/hung_task_timeou= t_secs" disables this message. >> [Mon Nov 2 06:35:57 2015] xfce4-sensors-p D 00000000 0 2611 25= 60 0x00000000 >> [Mon Nov 2 06:35:57 2015] e71f9e50 00200086 00000000 00000000 5ca900= 00 ffffffe0 eeec4ac0 00200246 >> [Mon Nov 2 06:35:57 2015] c167cb00 f79d1f40 e7ea3040 e71fa000 f6f345= dc f6f34400 e71f9e5c c14f1fdb >> [Mon Nov 2 06:35:57 2015] d5553960 e71f9e80 f867672f 00000000 e7ea30= 40 c1099250 c7a17d64 ea299e84 >> [Mon Nov 2 06:35:57 2015] Call Trace: >> [Mon Nov 2 06:35:57 2015] [] ? schedule+0x2b/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? wait_current_trans.isra.21+= 0x8f/0xf0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? wait_woken+0x80/0x80 >> [Mon Nov 2 06:35:57 2015] [] ? start_transaction+0x451/0x5= d0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_start_transaction+0x2= 4/0x30 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? __unlink_start_trans+0x20/0= xb0 [btrfs] >> [Mon Nov 2 06:35:57 2015] [] ? d_rehash+0x42/0x50 >> [Mon Nov 2 06:35:57 2015] [] ? btrfs_unlink+0x28/0xb0 [btr= fs] >> [Mon Nov 2 06:35:57 2015] [] ? vfs_unlink+0xf2/0x190 >> [Mon Nov 2 06:35:57 2015] [] ? do_unlinkat+0x21b/0x280 >> [Mon Nov 2 06:35:57 2015] [] ? 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