On 10/13/2014 11:07 AM, Trond Myklebust wrote:
> SteveD reports the following Oops:
> RIP: 0010:[<ffffffffa053461d>] [<ffffffffa053461d>] __put_nfs_open_context+0x1d/0x100 [nfs]
> RSP: 0018:ffff880fed687b90 EFLAGS: 00010286
> RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000006
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffff880fed687bc0 R08: 0000000000000092 R09: 000000000000047a
> R10: 0000000000000000 R11: ffff880fed6878d6 R12: ffff880fed687d20
> R13: ffff880fed687d20 R14: 0000000000000070 R15: ffffea000aa33ec0
> FS: 00007fce290f0740(0000) GS:ffff8807ffc60000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000070 CR3: 00000007f2e79000 CR4: 00000000000007e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Stack:
> 0000000000000000 ffff880036c5e510 ffff880fed687d20 ffff880fed687d20
> ffff880036c5e200 ffffea000aa33ec0 ffff880fed687bd0 ffffffffa0534710
> ffff880fed687be8 ffffffffa053d5f0 ffff880036c5e200 ffff880fed687c08
> Call Trace:
> [<ffffffffa0534710>] put_nfs_open_context+0x10/0x20 [nfs]
> [<ffffffffa053d5f0>] nfs_pgio_data_destroy+0x20/0x40 [nfs]
> [<ffffffffa053d672>] nfs_pgio_error+0x22/0x40 [nfs]
> [<ffffffffa053d8f4>] nfs_generic_pgio+0x74/0x2e0 [nfs]
> [<ffffffffa06b18c3>] pnfs_generic_pg_writepages+0x63/0x210 [nfsv4]
> [<ffffffffa053d579>] nfs_pageio_doio+0x19/0x50 [nfs]
> [<ffffffffa053eb84>] nfs_pageio_complete+0x24/0x30 [nfs]
> [<ffffffffa053cb25>] nfs_direct_write_schedule_iovec+0x115/0x1f0 [nfs]
> [<ffffffffa053675f>] ? nfs_get_lock_context+0x4f/0x120 [nfs]
> [<ffffffffa053d252>] nfs_file_direct_write+0x262/0x420 [nfs]
> [<ffffffffa0532d91>] nfs_file_write+0x131/0x1d0 [nfs]
> [<ffffffffa0532c60>] ? nfs_need_sync_write.isra.17+0x40/0x40 [nfs]
> [<ffffffff812127b8>] do_io_submit+0x3b8/0x840
> [<ffffffff81212c50>] SyS_io_submit+0x10/0x20
> [<ffffffff81610f29>] system_call_fastpath+0x16/0x1b
>
> This is due to the calls to nfs_pgio_error() in nfs_generic_pgio(), which
> happen before the nfs_pgio_header's open context is referenced in
> nfs_pgio_rpcsetup().
>
> Reported-by: Steve Dickson <SteveD@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 3.16.x
> Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Tested-by: Steve Dickson <steved@xxxxxxxxxx>
steved.
> ---
> fs/nfs/pagelist.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
> index 94e16ec88312..08085de879ed 100644
> --- a/fs/nfs/pagelist.c
> +++ b/fs/nfs/pagelist.c
> @@ -526,7 +526,8 @@ EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
> */
> void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
> {
> - put_nfs_open_context(hdr->args.context);
> + if (hdr->args.context)
> + put_nfs_open_context(hdr->args.context);
> if (hdr->page_array.pagevec != hdr->page_array.page_array)
> kfree(hdr->page_array.pagevec);
> }
>
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