On 15-12-2017 4:10, Akemi Yagi wrote: > On Mon, Dec 11, 2017 at 4:52 PM, 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: >> >> 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