Hello,

I've been struggle with this for months now.
Whenever there's a resume from suspend some random AppVms are killed. Although 
this doesn't happen all the time it happens often enough on resume sufficiently 
to indicate an issue.
It seems that the clock skew is too large resulting in a kernel panic that 
kills the AppVM as the error below shows.

Is anyone experiencing the same issue? Is there any solution to this?

Thank you in advance.

[38009.358471] clocksource: timekeeping watchdog on CPU0: Marking clocksource 
'tsc' as unstable because the skew is too large:
[38009.358521] clocksource: 'xen' wd_now: 2697b2c28a19 wd_last: 2696858155d9 
mask: ffffffffffffffff
[38009.358558] clocksource: 'tsc' cs_now: ffffff40e6dd060e cs_last: 
4900d58115e2 mask: ffffffffffffffff
[38009.358594] tsc: Marking TSC unstable due to clocksource watchdog
[79151.795501] borgmatic[2418]: segfault at 6060cafd8549 ip 00006060ca2ae054 sp 
00007ffe9d9bbad8 error 4 in python3.5[6060ca158000+3f0000]
[79151.795535] Code: 08 4c 8b 5e 08 4c 89 5b f0 4c 89 4e 08 4d 89 0b 48 89 73 
e8 4c 89 43 f8 eb 92 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 47 08 <f6> 80 a9 
00 00 00 40 75 03 31 c0 c3 53 48 8b 80 48 01 00 00 48 89
[79152.712396] general protection fault: 0000 [#1] SMP PTI
[79152.712416] CPU: 1 PID: 2425 Comm: systemctl Tainted: G O 
4.19.84-1.pvops.qubes.x86_64 #1
[79152.712444] RIP: 0010:__pv_queued_spin_lock_slowpath+0x199/0x270
[79152.712462] Code: eb bd 83 e0 03 c1 ea 12 4c 8d 6d 44 48 c1 e0 04 41 be 01 
00 00 00 4c 8d a0 80 10 02 00 8d 42 ff 48 98 4c 03 24 c5 20 77 17 82 <49> 89 2c 
24 b8 00 80 00 00 eb 15 84 c0 75 0a 41 0f b6 54 24 44 84
[79152.712509] RSP: 0018:ffffc900006c7b60 EFLAGS: 00010002
[79152.712524] RAX: 0000000000003ffe RBX: ffff8880f47b0764 RCX: 0000000000000001
[79152.712544] RDX: 0000000000003fff RSI: 0000000000000000 RDI: ffff8880f47b0764
[79152.712565] RBP: ffff8880f5b21080 R08: 0000000000000000 R09: ffffc90000637e90
[79152.712585] R10: ffffc900006c7e20 R11: 0000000000000001 R12: 64616f6c00708019
[79152.712605] R13: ffff8880f5b210c4 R14: 0000000000000001 R15: 0000000000080000
[79152.712626] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) 
knlGS:0000000000000000
[79152.712647] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[79152.712664] CR2: 00007f088e3efab4 CR3: 000000000220a004 CR4: 00000000003606e0
[79152.712687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[79152.712707] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[79152.712727] Call Trace:
[79152.712739] _raw_spin_lock_irqsave+0x32/0x40
[79152.712755] try_to_wake_up+0x3d/0x490
[79152.712767] __wake_up_common+0x96/0x180
[79152.712780] ep_poll_callback+0x1ac/0x2f0
[79152.712791] __wake_up_common+0x96/0x180
[79152.712803] __wake_up_common_lock+0x7c/0xc0
[79152.712819] sock_def_wakeup+0x32/0x40
[79152.712831] unix_release_sock+0x288/0x2d0
[79152.712844] unix_release+0x19/0x30
[79152.712855] __sock_release+0x3d/0xc0
[79152.712866] sock_close+0x11/0x20
[79152.712878] __fput+0xe2/0x210
[79152.712891] task_work_run+0x8a/0xb0
[79152.712903] do_exit+0x2eb/0xc30
[79152.712915] ? __do_page_fault+0x278/0x4f0
[79152.712926] do_group_exit+0x3a/0xa0
[79152.712938] __x64_sys_exit_group+0x14/0x20
[79152.716375] do_syscall_64+0x5b/0x190
[79152.716391] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[79152.716407] RIP: 0033:0x7f088fac8618
[79152.716422] Code: Bad RIP value.
[79152.716433] RSP: 002b:00007fffd239eba8 EFLAGS: 00000246 ORIG_RAX: 
00000000000000e7
[79152.716455] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f088fac8618
[79152.716475] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[79152.716496] RBP: 00007f088fda58e0 R08: 00000000000000e7 R09: fffffffffffffee8
[79152.716516] R10: 00007f088df83158 R11: 0000000000000246 R12: 00007f088fda58e0
[79152.716537] R13: 00007f088fdaac20 R14: 0000000000000000 R15: 0000000000000000
[79152.716558] Modules linked in: ip6table_filter ip6_tables xt_conntrack 
ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 
nf_defrag_ipv4 libcrc32c binfmt_misc intel_rapl crct10dif_pclmul crc32_pclmul 
crc32c_intel ghash_clmulni_intel xen_netfront intel_rapl_perf snd_pcm snd_timer 
snd soundcore pcspkr xen_netback u2mfn(O) xen_gntdev xen_gntalloc xen_blkback 
xen_evtchn parport_pc xenfs ppdev xen_privcmd lp parport overlay xen_blkfront
[79152.716680] ---[ end trace 1f4d28c382e93215 ]---
[79152.716703] RIP: 0010:__pv_queued_spin_lock_slowpath+0x199/0x270
[79152.716721] Code: eb bd 83 e0 03 c1 ea 12 4c 8d 6d 44 48 c1 e0 04 41 be 01 
00 00 00 4c 8d a0 80 10 02 00 8d 42 ff 48 98 4c 03 24 c5 20 77 17 82 <49> 89 2c 
24 b8 00 80 00 00 eb 15 84 c0 75 0a 41 0f b6 54 24 44 84
[79152.716768] RSP: 0018:ffffc900006c7b60 EFLAGS: 00010002
[79152.716782] RAX: 0000000000003ffe RBX: ffff8880f47b0764 RCX: 0000000000000001
[79152.716803] RDX: 0000000000003fff RSI: 0000000000000000 RDI: ffff8880f47b0764
[79152.716823] RBP: ffff8880f5b21080 R08: 0000000000000000 R09: ffffc90000637e90
[79152.716844] R10: ffffc900006c7e20 R11: 0000000000000001 R12: 64616f6c00708019
[79152.716864] R13: ffff8880f5b210c4 R14: 0000000000000001 R15: 0000000000080000
[79152.716885] FS: 0000000000000000(0000) GS:ffff8880f5b00000(0000) 
knlGS:0000000000000000
[79152.716906] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[79152.716923] CR2: 00007f088fac85ee CR3: 000000000220a004 CR4: 00000000003606e0
[79152.716946] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[79152.716967] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[79152.716987] Kernel panic - not syncing: Fatal exception
[79152.717276] Kernel Offset: disabled

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