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Subject9p: BUG: unable to handle kernel paging request at ffff880035698000
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Hi,

I was using the KVM tool for tests with trinity on top of a virtio-9p filesystem, and started seeing the BUGs below when I've put some pressure on the 9p fs (not much, just started writing the logs from trinity to a 9p fs).

This reproduces not so easily, but it happens 2-3 times a day.

[ 156.384520] BUG: unable to handle kernel paging request at ffff880035698000
[ 156.386845] IP: [<ffffffff825be143>] p9_release_pages+0x43/0x60
[ 156.388766] PGD 321d063 PUD 3221063 PMD 1ffa9067 PTE 35698160
[ 156.388766] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 156.393871] CPU 0
[ 156.393871] Pid: 10293, comm: trinity Not tainted 3.3.0-rc4-next-20120220-sasha-00003-g949d91b #14
[ 156.400127] RIP: 0010:[<ffffffff825be143>] [<ffffffff825be143>] p9_release_pages+0x43/0x60
[ 156.402161] RSP: 0018:ffff8800356edbf8 EFLAGS: 00010202
[ 156.402161] RAX: 0000000000000001 RBX: ffff880035697ff8 RCX: 0000000000000000
[ 156.402161] RDX: ffff8800330cb000 RSI: 0000000000000001 RDI: ffffea0000cfed40
[ 156.402161] RBP: ffff8800356edc18 R08: 0000000000000001 R09: 0000000000000000
[ 156.402161] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[ 156.407866] R13: 0000000000000001 R14: ffff880038a58070 R15: 0000000000000000
[ 156.407866] FS: 00007fb4bf398700(0000) GS:ffff88003de00000(0000) knlGS:0000000000000000
[ 156.407866] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.410381] CR2: ffff880035698000 CR3: 00000000355b2000 CR4: 00000000000406f0
[ 156.410949] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 156.410949] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 156.413619] Process trinity (pid: 10293, threadinfo ffff8800356ec000, task ffff8800330cb000)
[ 156.415369] Stack:
[ 156.415369] ffff8800356edc98 ffff8800356edc98 0000000000000000 ffff8800356edc98
[ 156.417242] ffff8800356edcf8 ffffffff825bed35 0000000000000076 0000000000000017
[ 156.417242] ffff8800356edcb0 ffff8800330cb000 0000000000001000 0000000000000286
[ 156.417242] Call Trace:
[ 156.417242] [<ffffffff825bed35>] p9_virtio_zc_request+0xd5/0x510
[ 156.417242] [<ffffffff810d3a10>] ? wake_up_bit+0x40/0x40
[ 156.417242] [<ffffffff825ba548>] p9_client_zc_rpc+0xe8/0x4f0
[ 156.417242] [<ffffffff810e9155>] ? sched_clock_local+0x25/0x90
[ 156.417242] [<ffffffff810df381>] ? get_parent_ip+0x11/0x50
[ 156.424263] [<ffffffff810df381>] ? get_parent_ip+0x11/0x50
[ 156.424263] [<ffffffff825babf2>] p9_client_write+0xe2/0x1e0
[ 156.424263] [<ffffffff81592e15>] v9fs_file_write_internal+0x65/0x140
[ 156.424263] [<ffffffff81592f7c>] v9fs_file_write+0x8c/0xb0
[ 156.424263] [<ffffffff811d6258>] vfs_write+0xc8/0x190
[ 156.424263] [<ffffffff811d640f>] sys_write+0x4f/0x90
[ 156.424263] [<ffffffff82663f39>] system_call_fastpath+0x16/0x1b
[ 156.424263] Code: ff 74 31 85 f6 74 2d 45 31 e4 eb 0e 0f 1f 40 00 45 39 e5 0f 1f 44 00 00 74 1a 66 0f 1f 44 00 00 e8 53 ef bb fe$
[ 156.432262] RIP [<ffffffff825be143>] p9_release_pages+0x43/0x60
[ 156.432262] RSP <ffff8800356edbf8>
[ 156.434735] CR2: ffff880035698000



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