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-----