On 29/11/12 02:21 PM, Al Viro wrote:
> On Thu, Nov 29, 2012 at 02:06:22PM -0800, Patrick McLean wrote:
>
>> I have a trivial reproducer and am happy to help debug in any way that
>> I can. That patch seems to fix the problem, and produces these
>> warnings in dmesg:
>
> OK... So we have differing entry->fh and NFS_FH(dentry->d_inode). Something
> like
> static void dump_fh(const struct nfs_fh *fh)
> {
> int i;
> printk(KERN_INFO "FH(%d)", fh->size);
> for (i = 0; i < fh->size; i++)
> printk(KERN_CONT "%c%02x", i ? ' ' : '[', fh->data[i]);
> printk(KERN_CONT "]\n");
> }
> with dump_fh(entry->fh); dump_fh(NFS_FH(dentry->d_inode)); added next to
> that WARN_ON(1) would probably be interesting. And probably would make
> sense to print filename->name as well, to see which files it is about.
>
Here is the output of the first of the 3 times it hits the WARN_ON (I can include all 3 if desired), with the filename.name at the end:
[ 8.821503] ------------[ cut here ]------------
[ 8.821512] WARNING: at fs/nfs/dir.c:463 nfs_readdir_page_filler+0x1d0/0x3d2()
[ 8.821513] Hardware name: Bochs
[ 8.821515] Modules linked in:
[ 8.821519] Pid: 630, comm: bash Not tainted 3.7.0-rc7+ #36
[ 8.821520] Call Trace:
[ 8.821528] [<ffffffff8108534c>] ? warn_slowpath_common+0x76/0x8a
[ 8.821531] [<ffffffff8117de95>] ? nfs_readdir_page_filler+0x1d0/0x3d2
[ 8.821535] [<ffffffff8117e6b3>] ? nfs_readdir_xdr_to_array+0x1c0/0x22d
[ 8.821538] [<ffffffff8117e73c>] ? nfs_readdir_filler+0x1c/0x6b
[ 8.821543] [<ffffffff810dca9a>] ? add_to_page_cache_lru+0x2c/0x36
[ 8.821546] [<ffffffff8117e720>] ? nfs_readdir_xdr_to_array+0x22d/0x22d
[ 8.821549] [<ffffffff810dcbe3>] ? do_read_cache_page+0x7d/0x12b
[ 8.821554] [<ffffffff811274f8>] ? sys_ioctl+0x7a/0x7a
[ 8.821557] [<ffffffff810dccc6>] ? read_cache_page+0x7/0x10
[ 8.821560] [<ffffffff8117e8b8>] ? nfs_readdir+0x12d/0x435
[ 8.821564] [<ffffffff8118e683>] ? nfs3_xdr_dec_create3res+0xc5/0xc5
[ 8.821568] [<ffffffff811274f8>] ? sys_ioctl+0x7a/0x7a
[ 8.821571] [<ffffffff811274f8>] ? sys_ioctl+0x7a/0x7a
[ 8.821574] [<ffffffff811277b3>] ? vfs_readdir+0x6c/0xa7
[ 8.821577] [<ffffffff811278da>] ? sys_getdents+0x7e/0xdc
[ 8.821581] [<ffffffff814ac7e9>] ? system_call_fastpath+0x16/0x1b
[ 8.821583] ---[ end trace 89263124889205c1 ]---
[ 8.821584] FH(0)]
[ 8.821586] FH(36)[01 00 07 01 89 00 00 00 00 00 00 00 e1 21 fe c4 9e 38 44 dc bf 1b d5 95 d6 76 d6 d9 a7 3c 1b 80 33 38 e3 62]
[ 8.821601] filename: proc
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