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qemu 1.7.0 vhost_net crash
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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