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[Qemu-devel] [Bug 891525] Re: Guest kernel crashes when booting a NUMA g


From: Thomas Huth
Subject: [Qemu-devel] [Bug 891525] Re: Guest kernel crashes when booting a NUMA guest without explicitly specifying cpus= in -numa option
Date: Tue, 08 Nov 2016 10:21:42 -0000

Is this still an issue with the latest version of QEMU?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/891525

Title:
  Guest kernel crashes when booting a NUMA guest without explicitly
  specifying cpus= in -numa option

Status in QEMU:
  Incomplete

Bug description:
  Target: x86_64-softmmu

  Qemu Command line: address@hidden qemu-1.0-rc2]# ./x86_64-softmmu/qemu-
  system-x86_64 -smp sockets=2,cores=4,threads=2 -numa
  node,nodeid=0,mem=4g -numa node,nodeid=1,mem=1g -cpu core2duo -m 5g
  /home/bharata/f15-lvm -nographic --enable-kvm -net
  nic,macaddr=54:52:00:46:26:84,model=e1000 -net tap,script=/etc/qemu-
  if,ifname=vnet0

  Qemu version: 1.0-rc2

  When guest is started with -numa option without explicitly specifying
  the cpus=, guest kernel crashes as below:

  [    0.252159] divide error: 0000 [#1] SMP 
  [    0.252970] last sysfs file: 
  [    0.252970] CPU 1 
  [    0.252970] Modules linked in:
  [    0.252970] 
  [    0.252970] Pid: 2, comm: kthreadd Not tainted 2.6.38.6-26.rc1.fc15.x86_64 
#1 Bochs Bochs
  [    0.252970] RIP: 0010:[<ffffffff8104f4d4>]  [<ffffffff8104f4d4>] 
select_task_rq_fair+0x44a/0x571
  [    0.252970] RSP: 0000:ffff88011767fc60  EFLAGS: 00010046
  [    0.252970] RAX: 0000000000000000 RBX: ffff88015d6ad300 RCX: 
0000000000000000
  [    0.252970] RDX: 0000000000000000 RSI: 0000000000000100 RDI: 
0000000000000000
  [    0.252970] RBP: ffff88011767fd10 R08: 0000000000000100 R09: 
ffff88015d6ad338
  [    0.252970] R10: 0000000000013840 R11: 0000000000800711 R12: 
0000000000000000
  [    0.252970] R13: ffff88015fc0f810 R14: 0000000000000001 R15: 
0000000000000000
  [    0.252970] FS:  0000000000000000(0000) GS:ffff88015fc00000(0000) 
knlGS:0000000000000000
  [    0.252970] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [    0.252970] CR2: 00000000ffffffff CR3: 0000000001a03000 CR4: 
00000000000006e0
  [    0.252970] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [    0.252970] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
  [    0.252970] Process kthreadd (pid: 2, threadinfo ffff88011767e000, task 
ffff88015d671720)
  [    0.252970] Stack:
  [    0.252970]  ffffffff81475873 ffffffff81a02140 ffff88011767fce0 
ffffffff8106c5a3
  [    0.252970]  ffff88015d6ad318 000000010000000e 0000000000013840 
0000000000013840
  [    0.252970]  ffff88015d6ad318 0000007d00000001 ffff880100000000 
ffff88015d6d81e8
  [    0.252970] Call Trace:
  [    0.252970]  [<ffffffff81475873>] ? _raw_spin_lock_irq+0x1c/0x1e
  [    0.252970]  [<ffffffff8106c5a3>] ? alloc_pid+0x2e6/0x335
  [    0.252970]  [<ffffffff81048960>] select_task_rq+0x16/0x46
  [    0.252970]  [<ffffffff8104e29a>] wake_up_new_task+0x3a/0xde
  [    0.252970]  [<ffffffff810546ce>] do_fork+0x1f1/0x2bf
  [    0.252970]  [<ffffffff8100804e>] ? load_TLS+0x10/0x14
  [    0.252970]  [<ffffffff81008714>] ? __switch_to+0xc6/0x220
  [    0.252970]  [<ffffffff81010c1a>] kernel_thread+0x75/0x77
  [    0.252970]  [<ffffffff8106eacf>] ? kthread+0x0/0x8c
  [    0.252970]  [<ffffffff8100a9e0>] ? kernel_thread_helper+0x0/0x10
  [    0.252970]  [<ffffffff8106ee93>] kthreadd+0xe7/0x124
  [    0.252970]  [<ffffffff8100a9e4>] kernel_thread_helper+0x4/0x10
  [    0.252970]  [<ffffffff8106edac>] ? kthreadd+0x0/0x124
  [    0.252970]  [<ffffffff8100a9e0>] ? kernel_thread_helper+0x0/0x10
  [    0.252970] Code: 01 45 c0 8b 8d 78 ff ff ff 48 8b 75 90 89 cf e8 4a 28 ff 
ff 3b 05 bd 89 ae 00 89 c1 7c c5 48 8b 45 c0 8b 4b 08 31 d2 48 c1 e0 0a 
  [    0.252970]  f7 f1 45 85 e4 75 08 48 3b 45 b0 72 08 eb 0d 48 89 45 b8 eb 
  [    0.252970] RIP  [<ffffffff8104f4d4>] select_task_rq_fair+0x44a/0x571
  [    0.252970]  RSP <ffff88011767fc60>

  When cpus= is specified for each node explicitly, guest boots fine.

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