[Bug 201825] Guest freezes during high IO load, host partially freezes, stack points to try_async_pf

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https://bugzilla.kernel.org/show_bug.cgi?id=201825

--- Comment #8 from Larkin Lowrey (llowrey@xxxxxxxxxxxxxxxxx) ---
Here it is again, even with 'no-kvmapf' kernel param.

[ 9411.787491] CPU: 30 PID: 4467 Comm: CPU 0/KVM Not tainted
4.20.3-200.fc29.x86_64 #1
[ 9411.787492] Hardware name: Supermicro H8DG6/H8DGi/H8DG6/H8DGi, BIOS 3.5c    
  03/18/2016
[ 9411.787492] RIP: 0010:find_get_entry+0x82/0x1e0
[ 9411.787494] Code: 00 00 74 e4 48 3d 06 04 00 00 74 dc 48 85 c0 0f 84 32 01
00 00 a8 01 75 5f 48 8b 40 08 48 8d 78 ff a8 01 48 0f 44 fe 8b 47 34 <85> c0 74
ba 8d 48 01 48 8d 57 34 f0 0f b1 4f 34 75 55 48 8b 47 08
[ 9411.787495] RSP: 0018:ffff9bfd8c3b3900 EFLAGS: 00000202
[ 9411.787496] RAX: 0000000000000201 RBX: 00007f0dbb890000 RCX:
0000000000000010
[ 9411.787497] RDX: ffffe775e5f52400 RSI: ffffe775e5f52400 RDI:
ffffe775e5f50000
[ 9411.787498] RBP: 0000000000000000 R08: ffff9bfd8c3b3900 R09:
0000000000000000
[ 9411.787498] R10: 0000000000070c90 R11: 0000000000000001 R12:
0000000000000000
[ 9411.787499] R13: ffff8b1a4b861180 R14: 0000000000070c90 R15:
ffffffff9127ede0
[ 9411.787500] FS:  00007f132dc9f700(0000) GS:ffff8b1a4eb80000(0000)
knlGS:0000000000000000
[ 9411.787500] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9411.787501] CR2: 000002bd05930000 CR3: 00000016c836a000 CR4:
00000000000406e0
[ 9411.787502] Call Trace:
[ 9411.787502]  pagecache_get_page+0x30/0x340
[ 9411.787503]  lookup_swap_cache+0x47/0x110
[ 9411.787503]  do_swap_page+0x9e/0x820
[ 9411.787504]  ? __switch_to_asm+0x40/0x70
[ 9411.787504]  __handle_mm_fault+0x883/0x1380
[ 9411.787505]  handle_mm_fault+0xda/0x200
[ 9411.787505]  __get_user_pages+0x273/0x7c0
[ 9411.787506]  ? swake_up_one+0x27/0x40
[ 9411.787506]  get_user_pages_unlocked+0xf4/0x1c0
[ 9411.787507]  __gfn_to_pfn_memslot+0x126/0x410 [kvm]
[ 9411.787508]  try_async_pf+0xbb/0x230 [kvm]
[ 9411.787508]  ? _cond_resched+0x15/0x30
[ 9411.787509]  ? kvm_host_page_size+0x72/0x80 [kvm]
[ 9411.787509]  tdp_page_fault+0x142/0x280 [kvm]
[ 9411.787510]  kvm_check_async_pf_completion+0x98/0x110 [kvm]
[ 9411.787511]  kvm_arch_vcpu_ioctl_run+0x5fd/0x1b20 [kvm]
[ 9411.787511]  kvm_vcpu_ioctl+0x22f/0x5e0 [kvm]
[ 9411.787512]  do_vfs_ioctl+0xa4/0x630
[ 9411.787512]  ? syscall_trace_enter+0x192/0x2c0
[ 9411.787513]  ksys_ioctl+0x60/0x90
[ 9411.787513]  __x64_sys_ioctl+0x16/0x20
[ 9411.787514]  do_syscall_64+0x5b/0x160
[ 9411.787514]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9411.787515] RIP: 0033:0x7f133059409b
[ 9411.787516] Code: 0f 1e fa 48 8b 05 ed bd 0c 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d bd bd 0c 00 f7 d8 64 89 01 48
[ 9411.787517] RSP: 002b:00007f132dc9e6c8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 9411.787518] RAX: ffffffffffffffda RBX: 00007f132d499001 RCX:
00007f133059409b
[ 9411.787519] RDX: 0000000000000000 RSI: 000000000000ae80 RDI:
0000000000000015
[ 9411.787520] RBP: 0000000000000001 R08: 0000562025efda50 R09:
00000000000000ff
[ 9411.787520] R10: 0000000000000001 R11: 0000000000000246 R12:
0000562025ee09c0
[ 9411.787521] R13: 0000000000000000 R14: 00007f132d498000 R15:
0000562026fa9000

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