[CentOS-virt] Xen PV DomU running Kernel 4.14.5-1.el7.elrepo.x86_64: xl -v vcpu-set <domU> <val> triggers domU kernel WARNING, then domU becomes unresponsive
George Dunlap
dunlapg at umich.edu
Mon Dec 18 11:02:22 UTC 2017
Adi,
Thanks for your detailed report -- would you mind reposting this to
xen-devel at lists.xenproject.org? This looks like a general Xen / Linux
bug (not specific to the Virt SIG packages), and there are a lot more
eyeballs there.
Thanks,
-George
On Tue, Dec 12, 2017 at 12:52 AM, Adi Pircalabu <adi at ddns.com.au> 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-----
>
> --
> Adi Pircalabu
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