[Qemu-devel] [Bug 1528214] Re: qemu 1.7.0 vhost_net crash

[wang liming]

my envionment is  centos6.5
and libvirt version is 1.2.14

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Title:
  qemu 1.7.0 vhost_net crash

Status in QEMU:
  New

Bug description:
  i find the crash in  /var/crash 
  the crash content is :
  <4>Pid: 6949, comm: qemu-system-x86 Not tainted 2.6.32-431.el6.x86_64 #1 
Powerleader PR2530G2/SC612DI-8F
  <4>RIP: 0010:[<ffffffff8118a849>]  [<ffffffff8118a849>] fput+0x9/0x30
  <4>RSP: 0018:ffff88015b601d98  EFLAGS: 00010292
  <4>RAX: 0000000000000382 RBX: ffff881e46590000 RCX: 00000000000001c3
  <4>RDX: 0000000000000000 RSI: ffff881e46590130 RDI: 0000000000000000
  <4>RBP: ffff88015b601d98 R08: ffff881e46598518 R09: 0000000000000000
  <4>R10: 0000000000000000 R11: 0000000000000246 R12: ffff881e46590010
  <4>R13: 0000000000000000 R14: ffff880c29812748 R15: 0000000000000000
  <4>FS:  00007f6a74d20700(0000) GS:ffff8810b8840000(0000) 
knlGS:0000000000000000
  <4>CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
  <4>CR2: 0000000000000030 CR3: 0000001c544cc000 CR4: 00000000001427e0
  <4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  <4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  <4>Process qemu-system-x86 (pid: 6949, threadinfo ffff88015b600000, task 
ffff880c1ed9c040)
  <4>Stack:
  <4> ffff88015b601e58 ffffffffa02ac3c8 ffff881e46590000 0000000000000000
  <4><d> ffff881e46590080 ffff881e46590078 ffff88015b601e38 0000000000000286
  <4><d> ffffffff00000000 0000000000000001 ffff88015b601e58 0000000000000282
  <4>Call Trace:
  <4> [<ffffffffa02ac3c8>] vhost_net_ioctl+0x328/0x5d0 [vhost_net]
  <4> [<ffffffff8119db42>] vfs_ioctl+0x22/0xa0
  <4> [<ffffffff8119dce4>] do_vfs_ioctl+0x84/0x580
  <4> [<ffffffff8118a7d1>] ? __fput+0x1a1/0x210
  <4> [<ffffffff8119e261>] sys_ioctl+0x81/0xa0
  <4> [<ffffffff810e1e5e>] ? __audit_syscall_exit+0x25e/0x290
  <4> [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
  <4>Code: fe ff ff 31 d2 48 89 de 83 cf ff ff d0 e9 da fe ff ff 48 89 df e8 28 
64 04 00 e9 bb fe ff ff 0f 1f 00 55 48 89 e5 0f 1f 44 00 00 <f0> 48 ff 4f 30 0f 
94 c0 84 c0 75 0b c9 c3 66 0f 1f
  84 00 00 00 
  <1>RIP  [<ffffffff8118a849>] fput+0x9/0x30
  <4> RSP <ffff88015b601d98>
  <4>CR2: 0000000000000030

  how the bug occure

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