From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751781AbdFHHEz convert rfc822-to-8bit (ORCPT ); Thu, 8 Jun 2017 03:04:55 -0400 Received: from mail1.bemta8.messagelabs.com ([216.82.243.200]:37740 "EHLO mail1.bemta8.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751092AbdFHHEw (ORCPT ); Thu, 8 Jun 2017 03:04:52 -0400 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmphleJIrShJLcpLzFFi42LJePGQSZf/u0W kwdGfOhaXd81hszg9sYfZYl/HAyaLm+uXsjmweLTsu8XusWvbTiaPz5vkApijWDPzkvIrElgz Tmz6yFywOqnizvnbrA2MmyK7GLk4hASeMEq8mfyUGcKZwyjxbdoWli5GTg42AR2J6Sd2sYHYI gLnGCW+zHQFsZkF1CTO9H8EqxEWsJD4f6mTEaLGUuL4wnlQ9UYSfxf8YQWxWQRUJPZ3LGQCsX kFfCQeLzsDZjMKyEpMe3SfCWKmuMTcabPA6iUEBCSW7DnPDGGLSrx8/A8ozgFky0tsmSUIUa4 jsWD3JzYIW1ti2cLXzBDjBSVOznzCMoFRaBaSqbOQtMxC0jILScsCRpZVjBrFqUVlqUW6RuZ6 SUWZ6RkluYmZObqGBhZ6uanFxYnpqTmJScV6yfm5mxiBcVHPwMC4g/HOE99DjJIcTEqivC6PL SKF+JLyUyozEosz4otKc1KLDzHKcHAoSfA++gqUEyxKTU+tSMvMAUYoTFqCg0dJhLfhM1Cat7 ggMbc4Mx0idYrRmGPD6vVfmDg6Jmz4wiTEkpeflyolzrsWZJIASGlGaR7cIFjiuMQoKyXMy8j AwCDEU5BalJtZgir/ilGcg1FJmNf+C9AUnsy8Erh9r4BOYQI6Zck7sFNKEhFSUg2MN5X+2UhJ V7GtkLMWkanIqCgR2Sr1+IiGCdc8o2+mklV8bc4nOsOWbP9ok/uIS8h9tcvH+20OU2wm5Le4r tzqcPNK3oc6x9CHPG8WPmj9qj+nKLLjwh2LP+b988SkXqprLLkovqxKos3z39ynqY4WNd6xGh v7D95u3Wy2VrvWjHWp71UZCSklluKMREMt5qLiRAA1jeVGFwMAAA== X-Env-Sender: liufeng24@lenovo.com X-Msg-Ref: server-13.tower-144.messagelabs.com!1496905487!18968911!1 X-Originating-IP: [104.232.225.2] X-StarScan-Received: X-StarScan-Version: 9.4.19; banners=-,-,- X-VirusChecked: Checked From: Feng Feng24 Liu To: "linux-kernel@vger.kernel.org" , "linux-rt-users@vger.kernel.org" , "rostedt@goodmis.org" , "tmac@hp.com" CC: Tong Tong3 Li Subject: RE: kernel BUG at kernel/locking/rtmutex.c:1027 Thread-Topic: kernel BUG at kernel/locking/rtmutex.c:1027 Thread-Index: AdLe194NHiLLuXEBQfy4K7tydbh7uwBSzeRw Date: Thu, 8 Jun 2017 07:01:08 +0000 Message-ID: <2B18E8E1DDAE074A82D1060396451DAE263C7C1A@CNMAILEX04.lenovo.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.96.19.89] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, T Makphaibulchoke & Steve I found that you discuss about " kernel BUG at kernel/locking/rtmutex.c:997 " at https://groups.google.com/forum/#!topic/fa.linux.kernel/aV2peeXs71E Could you help to give some advice? Our kernel version is: kernel4.4.6-rt14 Whether our problem ,which I describe above, is the same problem as " kernel BUG at kernel/locking/rtmutex.c:997"? And why is the patch "[PATCH 3.14.25-rt22 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at kernel/locking/rtmutex.c:997!" not apply to the upsteam or rt-patches? Thanks a lot Thanks Feng >-----Original Message----- >From: Feng Feng24 Liu >Sent: Tuesday, June 06, 2017 11:18 PM >To: 'linux-kernel@vger.kernel.org'; 'linux-rt-users@vger.kernel.org'; >'rostedt@goodmis.org' >Cc: Tong Tong3 Li >Subject: kernel BUG at kernel/locking/rtmutex.c:1027 > >Dear RT experts, > >I upgrate our kernel from kernel-3.10 to kernel4.4.6-rt14 in our environment. But >the RT kernel alway report deadlock. > >I added the following debugging statement: > >diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index >6c40660..e979aa9 100644 >--- a/kernel/locking/rtmutex.c >+++ b/kernel/locking/rtmutex.c >@@ -994,6 +994,10 @@ static void noinline __sched >rt_spin_lock_slowlock(struct rt_mutex *lock) > pi_unlock(&self->pi_lock); > > ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0); >+ if (unlikely(ret)) { >+ debug_rt_mutex_print_deadlock(&waiter); >+ } >+ > BUG_ON(ret); > > for (;;) { > >And the result is: > >Following is the dmesg of the RT kernel: >[51893.656645] ============================================ >[51893.656645] [ BUG: circular locking deadlock detected! ] [51893.656646] Not >tainted [51893.656646] -------------------------------------------- >[51893.656647] gmond/9537 is deadlocking current task gmetad/4455 >[51893.656647] [51893.656648] [51893.656648] 1) gmetad/4455 is trying to acquire >this lock: >[51893.656649] [ffff88023fc8d340] {&(&base->lock)->lock} [51893.656650] >[51893.656650] 2) gmond/9537 is blocked on this lock: >[51893.656650] [ffff880030fe6c08] {&(&(sk)->sk_lock.slock)->lock} >[51893.656651] .. ->owner: ffff8800b9c2bc01 >[51893.656652] .. held by: gmetad: 4455 [ffff8800b9c2bc00, 120] >[51893.656653] >[51893.656653] gmond/9537's [blocked] stackdump: >[51893.656653] >[51893.656655] ffff8802157f7b28 ffff880216278c00 ffff880014c1c800 >ffff8802157f8000 [51893.656656] 0000000000000000 ffff880014c1c800 >ffff8800b9c2bc00 ffff880030fe6c08 [51893.656657] ffff8802157f7b48 >ffffffff81a7ae07 ffff8802157f7c30 0000000000000282 [51893.656658] Call Trace: >[51893.656665] [] preempt_schedule_irq+0x57/0xc0 >[51893.656668] [] do_preempt_schedule_irq+0x5/0x7 >[51893.656670] [] ? rt_spin_lock_slowlock+0x2e4/0x3a0 >[51893.656672] [] ? rt_spin_lock_slowlock+0x2cf/0x3a0 >[51893.656674] [] rt_spin_lock+0x1f/0x30 [51893.656678] >[] lock_sock_nested+0x23/0x60 [51893.656680] >[] tcp_sendmsg+0x26/0xad0 [51893.656683] >[] inet_sendmsg+0x7f/0xb0 [51893.656685] >[] sock_sendmsg+0x38/0x50 [51893.656686] >[] sock_write_iter+0x7b/0xd0 [51893.656690] >[] __vfs_write+0xad/0xe0 [51893.656692] [] >vfs_write+0xa1/0x180 [51893.656694] [] SyS_write+0x49/0xb0 >[51893.656695] [] ? context_tracking_enter+0x1d/0x30 >[51893.656697] [] entry_SYSCALL_64_fastpath+0x12/0x71 >[51893.656698] >[51893.656698] gmetad/4455's [current] stackdump: >[51893.656698] >[51893.656700] CPU: 2 PID: 4455 Comm: gmetad Not tainted 4.4.6-thinkcloud-nfv >#1 [51893.656701] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 >[51893.656702] 0000000000000000 ffff8800ba207618 ffffffff8140113e >ffff8800ba207688 [51893.656703] ffff880014c1c800 ffff8800ba207650 >ffffffff810a2f5e ffff8800ba207688 [51893.656704] 0000000000000286 >ffff8800b9c2bc00 000000000000d340 ffff88023fc8d340 [51893.656705] Call Trace: >[51893.656707] [] dump_stack+0x65/0x87 [51893.656710] >[] debug_rt_mutex_print_deadlock+0x15e/0x180 >[51893.656712] [] rt_spin_lock_slowlock+0x372/0x3a0 >[51893.656715] [] ? ip_finish_output+0x139/0x1f0 >[51893.656717] [] rt_spin_lock+0x1f/0x30 [51893.656720] >[] lock_timer_base.isra.33+0x58/0x70 [51893.656722] >[] mod_timer+0x7b/0x210 [51893.656724] [] >sk_reset_timer+0x18/0x30 [51893.656725] [] >tcp_rearm_rto+0x6b/0xb0 [51893.656727] [] >tcp_event_new_data_sent+0x83/0x90 [51893.656729] [] >tcp_write_xmit+0x174/0xe90 [51893.656730] [] >__tcp_push_pending_frames+0x31/0xa0 >[51893.656732] [] tcp_rcv_established+0x227/0x770 >[51893.656733] [] tcp_v4_do_rcv+0x10c/0x230 [51893.656734] >[] tcp_v4_rcv+0x8a9/0xa10 [51893.656737] [] >ip_local_deliver_finish+0x9c/0x240 >[51893.656738] [] ip_local_deliver+0xbd/0xd0 [51893.656740] >[] ? ip_rcv_finish+0x310/0x310 [51893.656741] >[] ip_rcv_finish+0x7d/0x310 [51893.656743] >[] ip_rcv+0x2e8/0x420 [51893.656744] [] ? >inet_del_offload+0x40/0x40 [51893.656747] [] >__netif_receive_skb_core+0x37c/0xa20 >[51893.656748] [] ? ip_output+0x80/0xc0 [51893.656750] >[] ? __ip_local_out+0x62/0xe0 [51893.656751] >[] ? ip_fragment.constprop.50+0x80/0x80 >[51893.656752] [] __netif_receive_skb+0x1d/0x60 >[51893.656754] [] process_backlog+0xba/0x1c0 [51893.656755] >[] net_rx_action+0x175/0x3a0 [51893.656759] >[] do_current_softirqs+0x20b/0x420 [51893.656761] >[] __local_bh_enable+0x60/0x80 [51893.656762] >[] release_sock+0x128/0x170 [51893.656764] >[] tcp_recvmsg+0x2f6/0xb90 [51893.656765] >[] ? preempt_count_add+0xa3/0xc0 [51893.656767] >[] ? _raw_spin_unlock_irqrestore+0x20/0x50 >[51893.656768] [] inet_recvmsg+0x90/0xb0 [51893.656769] >[] sock_recvmsg+0x3b/0x50 [51893.656770] >[] sock_read_iter+0x88/0xd0 [51893.656772] >[] __vfs_read+0xaa/0xe0 [51893.656774] [] >vfs_read+0x82/0x110 [51893.656775] [] SyS_read+0x49/0xb0 >[51893.656776] [] ? context_tracking_enter+0x1d/0x30 >[51893.656778] [] entry_SYSCALL_64_fastpath+0x12/0x71 >[51893.656778] [ turning off deadlock detection.Please report this trace. ] >[51893.656778] [51893.656796] ------------[ cut here ]------------ [51893.656796] >kernel BUG at kernel/locking/rtmutex.c:1027! >[51893.656798] invalid opcode: 0000 [#1] PREEMPT SMP [51893.656822] Modules >linked in: xt_REDIRECT nf_nat_redirect xt_nat xt_mark ip6table_raw >ip6table_mangle ip6table_filter ip6_tables xt_connmark 8021q garp mrp veth >openvswitch xt_CHECKSUM iptable_mangle xt_tcpudp xt_multiport xt_conntrack >iptable_filter xt_CT iptable_raw ipt_MASQUERADE nf_nat_masquerade_ipv4 >xt_comment iptable_nat nf_nat_ipv4 nf_nat kvm_intel kvm irqbypass >crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 glue_helper lrw ablk_helper >cryptd snd_hda_codec_generic snd_hda_intel snd_hda_codec input_leds >snd_hwdep snd_hda_core led_class tpm_tis nf_conntrack_ipv6 nf_defrag_ipv6 >nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables x_tables raid1 serio_raw pata_acpi >[last unloaded: ipmi_msghandler] [51893.656824] CPU: 2 PID: 4455 Comm: gmetad >Not tainted 4.4.6-thinkcloud-nfv #1 [51893.656824] Hardware name: Red Hat KVM, >BIOS 0.5.1 01/01/2011 [51893.656825] task: ffff8800b9c2bc00 ti: ffff8800ba204000 >task.ti: ffff8800ba204000 [51893.656828] RIP: 0010:[] >[] rt_spin_lock_slowlock+0x372/0x3a0 [51893.656829] RSP: >0018:ffff8800ba207660 EFLAGS: 00010086 [51893.656830] RAX: 000000000000003d >RBX: ffff8800ba207688 RCX: 0000000000000000 [51893.656831] RDX: >0000000000000002 RSI: ffffffff81c89168 RDI: ffffffff81cb316f [51893.656832] RBP: >ffff8800ba207718 R08: 000000000000015c R09: ffffffff8211a7e5 [51893.656832] R10: >000000000000f698 R11: 0000000000000000 R12: 0000000000000286 [51893.656833] >R13: ffff8800b9c2bc00 R14: 000000000000d340 R15: ffff88023fc8d340 [51893.656835] >FS: 00007f05d85ca700(0000) GS:ffff88023fd00000(0000) knlGS:0000000000000000 >[51893.656836] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [51893.656841] >CR2: 0000000004595ff0 CR3: 00000000b9835000 CR4: 00000000000006e0 >[51893.656845] Stack: >[51893.656847] 010000000000ffff 0000000000000000 ffff8800ba2076b0 >ffffffff818d27a9 [51893.656849] ffff8800b9c2c2e8 0000000000000001 >0000000000000000 0000000000000000 [51893.656851] ffff8800ba2076a0 >0000000000000000 0000000000000000 ffff8800b9c2bc00 [51893.656851] Call Trace: >[51893.656854] [] ? ip_finish_output+0x139/0x1f0 >[51893.656857] [] rt_spin_lock+0x1f/0x30 [51893.656859] >[] lock_timer_base.isra.33+0x58/0x70 [51893.656861] >[] mod_timer+0x7b/0x210 [51893.656863] [] >sk_reset_timer+0x18/0x30 [51893.656864] [] >tcp_rearm_rto+0x6b/0xb0 [51893.656865] [] >tcp_event_new_data_sent+0x83/0x90 [51893.656867] [] >tcp_write_xmit+0x174/0xe90 [51893.656869] [] >__tcp_push_pending_frames+0x31/0xa0 >[51893.656870] [] tcp_rcv_established+0x227/0x770 >[51893.656871] [] tcp_v4_do_rcv+0x10c/0x230 [51893.656872] >[] tcp_v4_rcv+0x8a9/0xa10 [51893.656874] [] >ip_local_deliver_finish+0x9c/0x240 >[51893.656875] [] ip_local_deliver+0xbd/0xd0 [51893.656877] >[] ? ip_rcv_finish+0x310/0x310 [51893.656878] >[] ip_rcv_finish+0x7d/0x310 [51893.656880] >[] ip_rcv+0x2e8/0x420 [51893.656881] [] ? >inet_del_offload+0x40/0x40 [51893.656883] [] >__netif_receive_skb_core+0x37c/0xa20 >[51893.656884] [] ? ip_output+0x80/0xc0 [51893.656886] >[] ? __ip_local_out+0x62/0xe0 [51893.656887] >[] ? ip_fragment.constprop.50+0x80/0x80 >[51893.656889] [] __netif_receive_skb+0x1d/0x60 >[51893.656890] [] process_backlog+0xba/0x1c0 [51893.656891] >[] net_rx_action+0x175/0x3a0 [51893.656893] >[] do_current_softirqs+0x20b/0x420 [51893.656895] >[] __local_bh_enable+0x60/0x80 [51893.656897] >[] release_sock+0x128/0x170 [51893.656898] >[] tcp_recvmsg+0x2f6/0xb90 [51893.656899] >[] ? preempt_count_add+0xa3/0xc0 [51893.656901] >[] ? _raw_spin_unlock_irqrestore+0x20/0x50 >[51893.656902] [] inet_recvmsg+0x90/0xb0 [51893.656903] >[] sock_recvmsg+0x3b/0x50 [51893.656905] >[] sock_read_iter+0x88/0xd0 [51893.656906] >[] __vfs_read+0xaa/0xe0 [51893.656908] [] >vfs_read+0x82/0x110 [51893.656909] [] SyS_read+0x49/0xb0 >[51893.656911] [] ? context_tracking_enter+0x1d/0x30 >[51893.656912] [] entry_SYSCALL_64_fastpath+0x12/0x71 >[51893.656925] Code: 4d 58 ff e9 3e fe ff ff 0f 0b 49 8b 57 18 e9 22 fd ff ff 89 c6 48 c7 >c7 a0 ba c7 81 31 c0 e8 27 83 6c ff 48 89 df e8 de 6a 62 ff <0f> 0b 0f 0b e8 c5 57 62 ff >e8 d0 4c 58 ff e9 6c fd ff ff 0f 0b [51893.656927] RIP [] >rt_spin_lock_slowlock+0x372/0x3a0 [51893.656927] RSP > >I find there is a discuss at: > https://groups.google.com/forum/#!topic/fa.linux.kernel/aV2peeXs71E >Whether it is the same problem as above? And why is these correction not apply >into rtmutex.c(4.4.6-rt14)? >Is this a defect which need to be fix? > >Thanks >Feng