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

[Thomas Huth]

Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU and the kernel? Or could we close this
ticket nowadays? ... also, since this looks like a kernel bug instead of
a QEMU bug, have you tried to report it to the KVM or virtio mailing
list instead?

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

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Title:
  qemu 1.7.0 vhost_net crash

Status in QEMU:
  Incomplete

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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