Re: 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

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On 12/19/2017 09:12 AM, Johnny Hughes wrote:
> 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
> 
> 

OK .. I have built and pushed to the testing tag the following dom0 kernels:

kernel-4.9.70-29.el7
kernel-4.9.70-29.el6

they will show up in a couple hours here:

https://buildlogs.centos.org/centos/6/virt/x86_64/xen/

https://buildlogs.centos.org/centos/7/virt/x86_64/xen/



> 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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