There are a couple of xen updates in the 4.9.66 and 4.9.68 kernels: https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.66 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.68 Let me build a newer Dom0 kernel and see if that helps. Thanks, Johnny Hughes On 12/11/2017 06:52 PM, Adi Pircalabu wrote: > Has anyone seen this recently? I couldn't replicate it on: > - CentOS 6 running kernel-2.6.32-696.16.1.el6.x86_64, > kernel-lt-4.4.105-1.el6.elrepo.x86_64 > - CentOS 7 running 4.9.67-1.el7.centos.x86_64 > > But I can replicate it consistently running "xl -v vcpu-set <domU> > <val>" on: > - CentOS 6 running 4.14.5-1.el6.elrepo.x86_64 > - CentOS 7 running 4.14.5-1.el7.elrepo.x86_64 > > dom0 versions tested with similar results in the domU: > - 4.6.6-6.el7 on kernel 4.9.63-29.el7.x86_64 > - 4.6.3-15.el6 on kernel 4.9.37-29.el6.x86_64 > > Noticed behaviour: > - These commands stall: > top > ls -l /var/tmp > ls -l /tmp > - Stuck in D state on the CentOS 7 domU: > root 5 0.0 0.0 0 0 ? D 11:20 0:00 > [kworker/u8:0] > root 316 0.0 0.0 0 0 ? D 11:20 0:00 > [jbd2/xvda1-8] > root 1145 0.0 0.2 116636 4776 ? Ds 11:20 0:00 -bash > root 1289 0.0 0.1 25852 2420 ? Ds 11:35 0:00 > /usr/bin/systemd-tmpfiles --clean > root 1290 0.0 0.1 125248 2696 pts/1 D+ 11:44 0:00 ls > --color=auto -l /tmp/ > root 1293 0.0 0.1 125248 2568 pts/2 D+ 11:44 0:00 ls > --color=auto -l /var/tmp > root 1296 0.0 0.2 116636 4908 pts/3 Ds+ 11:44 0:00 -bash > root 1358 0.0 0.1 125248 2612 pts/4 D+ 11:47 0:00 ls > --color=auto -l /var/tmp > > At a first glance it appears the issue is in 4.14.5 kernel. Stack traces > follow: > > -----CentOS 6 kernel-ml-4.14.5-1.el6.elrepo.x86_64 start here----- > ------------[ cut here ]------------ > WARNING: CPU: 4 PID: 60 at block/blk-mq.c:1144 > __blk_mq_run_hw_queue+0x9e/0xc0 > Modules linked in: intel_cstate(-) ipt_REJECT nf_reject_ipv4 > nf_conntrack_ipv4 nf_defrag_ipv4 xt_multiport iptable_filter ip_tables > ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 xt_state > nf_conntrack libcrc32c ip6table_filter ip6_tables dm_mod dax > xen_netfront crc32_pclmul crct10dif_pclmul ghash_clmulni_intel > crc32c_intel pcbc aesni_intel glue_helper crypto_simd cryptd aes_x86_64 > coretemp hwmon x86_pkg_temp_thermal sb_edac intel_rapl_perf pcspkr ext4 > jbd2 mbcache xen_blkfront > CPU: 4 PID: 60 Comm: kworker/4:1H Not tainted 4.14.5-1.el6.elrepo.x86_64 #1 > Workqueue: kblockd blk_mq_run_work_fn > task: ffff8802711a2780 task.stack: ffffc90041af4000 > RIP: e030:__blk_mq_run_hw_queue+0x9e/0xc0 > RSP: e02b:ffffc90041af7c48 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: ffff88027117fa80 RCX: 0000000000000001 > RDX: ffff88026b053ee0 RSI: ffff88027351bca0 RDI: ffff88026b072800 > RBP: ffffc90041af7c68 R08: ffffc90041af7eb8 R09: ffff8802711a2810 > R10: 0000000000007ff0 R11: 0000000000000001 R12: ffff88026b072800 > R13: ffffe8ffffd04d00 R14: 0000000000000000 R15: ffffe8ffffd04d05 > FS: 00002b7b7c89b700(0000) GS:ffff880273500000(0000) > knlGS:0000000000000000 > CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffff600400 CR3: 000000026d953000 CR4: 0000000000042660 > Call Trace: > blk_mq_run_work_fn+0x31/0x40 > process_one_work+0x174/0x440 > ? xen_mc_flush+0xad/0x1b0 > ? schedule+0x3a/0xa0 > worker_thread+0x6b/0x410 > ? default_wake_function+0x12/0x20 > ? __wake_up_common+0x84/0x130 > ? maybe_create_worker+0x120/0x120 > ? schedule+0x3a/0xa0 > ? _raw_spin_unlock_irqrestore+0x16/0x20 > ? maybe_create_worker+0x120/0x120 > kthread+0x111/0x150 > ? __kthread_init_worker+0x40/0x40 > ret_from_fork+0x25/0x30 > Code: 89 df e8 06 2f d9 ff 4c 89 e7 41 89 c5 e8 0b 6e 00 00 44 89 ee 48 > 89 df e8 20 2f d9 ff 48 8b 5d e8 4c 8b 65 f0 4c 8b 6d f8 c9 c3 <0f> ff > eb aa 4c 89 e7 e8 e6 6d 00 00 48 8b 5d e8 4c 8b 65 f0 4c > ---[ end trace fe2aaf4e723042fd ]--- > -----CentOS 6 kernel-ml-4.14.5-1.el6.elrepo.x86_64 end here----- > > -----CentOS 7 kernel-ml-4.14.5-1.el7.elrepo.x86_64 start here----- > [ 116.528885] ------------[ cut here ]------------ > [ 116.528894] WARNING: CPU: 3 PID: 38 at block/blk-mq.c:1144 > __blk_mq_run_hw_queue+0x89/0xa0 > [ 116.528898] Modules linked in: intel_cstate(-) ip_set_hash_ip ip_set > nfnetlink x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul > ghash_clmulni_intel pcbc aesni_intel crypto_simd glue_helper cryptd > intel_rapl_perf pcspkr nfsd auth_rpcgss nfs_acl lockd grace sunrpc > ip_tables ext4 mbcache jbd2 xen_netfront xen_blkfront crc32c_intel > [ 116.528919] CPU: 3 PID: 38 Comm: kworker/3:1H Not tainted > 4.14.5-1.el7.elrepo.x86_64 #1 > [ 116.529007] Code: 00 e8 7c c5 45 00 4c 89 e7 e8 14 4b d7 ff 48 89 df > 41 89 c5 e8 19 66 00 00 44 89 ee 4c 89 e7 e8 2e 4b d7 ff 5b 41 5c 41 5d > 5d c3 <0f> ff eb b4 48 89 df e8 fb 65 00 00 5b 41 5c 41 5d 5d c3 0f ff > [ 116.529034] ---[ end trace a7814e3ec9a330c6 ]--- > [ 147.424117] ------------[ cut here ]------------ > [ 147.424150] WARNING: CPU: 2 PID: 24 at block/blk-mq.c:1144 > __blk_mq_run_hw_queue+0x89/0xa0 > [ 147.424160] Modules linked in: ip_set_hash_ip ip_set nfnetlink > x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul > ghash_clmulni_intel pcbc aesni_intel crypto_simd glue_helper cryptd > intel_rapl_perf pcspkr nfsd auth_rpcgss nfs_acl lockd grace sunrpc > ip_tables ext4 mbcache jbd2 xen_netfront xen_blkfront crc32c_intel > [ 147.424222] CPU: 2 PID: 24 Comm: kworker/2:0H Tainted: G W > 4.14.5-1.el7.elrepo.x86_64 #1 > [ 147.424238] Workqueue: kblockd blk_mq_run_work_fn > [ 147.424247] task: ffff88007c539840 task.stack: ffffc900403e4000 > [ 147.424259] RIP: e030:__blk_mq_run_hw_queue+0x89/0xa0 > [ 147.424270] RSP: e02b:ffffc900403e7e30 EFLAGS: 00010202 > [ 147.424279] RAX: 0000000000000001 RBX: ffff880003b83800 RCX: > ffff88007d11bca0 > [ 147.424288] RDX: ffff88007c656c88 RSI: 00000000000000a0 RDI: > ffff880003b83800 > [ 147.424298] RBP: ffffc900403e7e48 R08: 0000000000000000 R09: > 0000000000000000 > [ 147.424309] R10: 0000000000007ff0 R11: 00000000000074e5 R12: > ffff88007c436900 > [ 147.424319] R13: ffff88007d11bc80 R14: ffff88007d121b00 R15: > ffff880003b83848 > [ 147.424340] FS: 0000000000000000(0000) GS:ffff88007d100000(0000) > knlGS:ffff88007d100000 > [ 147.424350] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 147.424359] CR2: 00007f504f19a700 CR3: 0000000079bed000 CR4: > 0000000000042660 > [ 147.424370] Call Trace: > [ 147.424384] blk_mq_run_work_fn+0x2c/0x30 > [ 147.424400] process_one_work+0x149/0x360 > [ 147.424411] worker_thread+0x4d/0x3e0 > [ 147.424421] kthread+0x109/0x140 > [ 147.424432] ? rescuer_thread+0x380/0x380 > [ 147.424441] ? kthread_park+0x60/0x60 > [ 147.424455] ret_from_fork+0x25/0x30 > [ 147.424463] Code: 00 e8 7c c5 45 00 4c 89 e7 e8 14 4b d7 ff 48 89 df > 41 89 c5 e8 19 66 00 00 44 89 ee 4c 89 e7 e8 2e 4b d7 ff 5b 41 5c 41 5d > 5d c3 <0f> ff eb b4 48 89 df e8 fb 65 00 00 5b 41 5c 41 5d 5d c3 0f ff > [ 147.424554] ---[ end trace a7814e3ec9a330c7 ]--- > -----CentOS 7 kernel-ml-4.14.5-1.el7.elrepo.x86_64 end here----- >
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