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 15-12-2017 4:10, Akemi Yagi wrote:
On Mon, Dec 11, 2017 at 4:52 PM, Adi Pircalabu <adi@xxxxxxxxxxx>
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:

Adi Pircalabu

Can you test-install 4.15-rcX​
 to see if the problem persists in the latest kernel?:

​http://elrepo.org/people/ajb/devel/kernel-ml/el7/x86_64/RPMS/ [1]

Akemi

Thanks for that, tested it on both CentOS 6 and 7 PV domU and I get similar panics:

-----CentOS 6-----
[...]
dracut: Switching root
		Welcome to CentOS
Starting udev: udev: starting version 147
input: PC Speaker as /devices/platform/pcspkr/input/input0
xen_netfront: Initialising Xen virtual ethernet driver
BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: coretemp_cpu_online+0x116/0x190 [coretemp]
PGD 7b5c7067 P4D 7b5c7067 PUD 7b5cd067 PMD 0
Oops: 0002 [#1] SMP
Modules linked in: coretemp(+) hwmon xen_netfront pcspkr ext4 jbd2 mbcache xen_blkfront dm_mirror dm_region_hash dm_log dm_mod dax CPU: 0 PID: 12 Comm: cpuhp/0 Not tainted 4.15.0-0.rc1.el6.elrepo.x86_64 #1
task: ffff88007c8f43c0 task.stack: ffffc90040390000
RIP: e030:coretemp_cpu_online+0x116/0x190 [coretemp]
RSP: e02b:ffffc90040393cd8 EFLAGS: 00010246
RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffff88007c87c248
RDX: 0000000000000000 RSI: ffff880077720c28 RDI: ffff8800069ea020
RBP: ffffc90040393d18 R08: 0000000000000000 R09: ffffc90040393a08
R10: 0000000000000000 R11: 000000000000005f R12: 0000000000000000
R13: ffff8800069ea000 R14: ffff88007f60a040 R15: 0000000000000000
FS: 00007f685ca0a700(0000) GS:ffff88007f600000(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 000000000683a000 CR4: 0000000000042660
Call Trace:
 ? coretemp_add_core+0x50/0x50 [coretemp]
 cpuhp_invoke_callback+0xe9/0x700
 ? put_prev_task_fair+0x26/0x40
 ? __schedule+0x2d0/0x6e0
 ? __wake_up_common+0x84/0x130
 ? __wake_up_common+0x84/0x130
 cpuhp_thread_fun+0xee/0x170
 smpboot_thread_fn+0x10c/0x160
 ? smpboot_create_threads+0x80/0x80
 kthread+0x10a/0x140
 ? kthread_probe_data+0x40/0x40
 ret_from_fork+0x1f/0x30
Code: 11 15 41 e1 49 89 c5 b8 f4 ff ff ff 4d 85 ed 0f 84 66 ff ff ff 4c 89 ef e8 88 11 41 e1 85 c0 75 6e 48 8b 05 75 17 00 00 4d 63 ff <4e> 89 2c f8 49 81 fd 00 f0 ff ff 44 89 e8 0f 87 3c ff ff ff 49
RIP: coretemp_cpu_online+0x116/0x190 [coretemp] RSP: ffffc90040393cd8
CR2: 0000000000000010
---[ end trace 8253bafacf228cf2 ]---
-----CentOS 6-----
-----CentOS 7-----
[...]
[  OK  ] Found device /dev/xvda2.
         Activating swap /dev/xvda2...
[    4.998940] alg: No test for pcbc(aes) (pcbc-aes-aesni)
[ 5.001054] Adding 1048572k swap on /dev/xvda2. Priority:-2 extents:1 across:1048572k SSFS
[  OK  ] Activated swap /dev/xvda2.
[  OK  ] Reached target Swap.
[ 5.020760] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[    5.020767] IP: coretemp_cpu_online+0xf8/0x1f7 [coretemp]
[    5.020769] PGD 0 P4D 0
[    5.020771] Oops: 0002 [#1] SMP
[ 5.020773] Modules linked in: coretemp(+) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel crypto_simd glue_helper cryptd pcspkr intel_rapl_perf nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables ext4 mbcache jbd2 xen_netfront xen_blkfront crc32c_intel [ 5.020786] CPU: 0 PID: 12 Comm: cpuhp/0 Not tainted 4.15.0-0.rc3.el7.elrepo.x86_64 #1
[    5.020789] RIP: e030:coretemp_cpu_online+0xf8/0x1f7 [coretemp]
[    5.020790] RSP: e02b:ffffc90040387e10 EFLAGS: 00010246
[ 5.020793] RAX: 0000000000000010 RBX: ffff8800040d8800 RCX: 0000000000000000 [ 5.020794] RDX: ffff880079761e70 RSI: ffff88007c438cc8 RDI: ffff8800040d8820 [ 5.020796] RBP: ffffc90040387e40 R08: 0000000000000000 R09: ffffffff81f8aff0 [ 5.020798] R10: ffff88007d01f400 R11: 0000000000000000 R12: 0000000000000000 [ 5.020800] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88007d00a020 [ 5.020804] FS: 0000000000000000(0000) GS:ffff88007d000000(0000) knlGS:0000000000000000
[    5.020806] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5.020808] CR2: 0000000000000010 CR3: 0000000004731000 CR4: 0000000000042660
[    5.020810] Call Trace:
[    5.020814]  ? create_core_data+0x5f0/0x5f0 [coretemp]
[    5.020817]  cpuhp_invoke_callback+0xae/0x5c0
[    5.020820]  ? __schedule+0x295/0x880
[    5.020823]  cpuhp_thread_fun+0xce/0x170
[    5.020825]  smpboot_thread_fn+0x110/0x160
[    5.020827]  kthread+0x102/0x140
[    5.020828]  ? sort_range+0x30/0x30
[    5.020831]  ? kthread_associate_blkcg+0xa0/0xa0
[    5.020833]  ret_from_fork+0x1f/0x30
[ 5.020834] Code: 21 a0 41 0f b7 f6 e8 38 73 30 e1 48 89 c3 b8 f4 ff ff ff 48 85 db 74 c0 48 89 df e8 d3 69 30 e1 85 c0 75 7c 48 8b 05 40 18 00 00 <4a> 89 1c f0 48 81 fb 00 f0 ff ff 0f 87 e7 00 00 00 49 8b 47 4c [ 5.020852] RIP: coretemp_cpu_online+0xf8/0x1f7 [coretemp] RSP: ffffc90040387e10
[    5.020854] CR2: 0000000000000010
[    5.020856] ---[ end trace 9ce91afe6b362317 ]---
[    5.020858] Kernel panic - not syncing: Fatal exception
[    5.020861] Kernel Offset: disabled
-----CentOS 7-----

For CentOS 7 I've also tried booting it using vcpus = 1 and no maxvcpus with the same outcome. Looks like 4.15-rc is a no go for me :)

Cheers,

---
Adi Pircalabu
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