• Russell King's avatar
    NFS: mount failure causes bad page state · f16c9603
    Russell King authored
    While testing a kernel based upon ecd744ee
    (with wrong boot arguments), I got the following bad page state entry while
    NFS was trying to mount it's rootfs:
    
    IP-Config: Complete:
          device=eth0, addr=192.168.1.101, mask=255.255.255.0, gw=255.255.255.255,
         host=192.168.1.101, domain=, nis-domain=(none),
         bootserver=192.168.1.100, rootserver=192.168.1.100, rootpath=
    Looking up port of RPC 100003/2 on 192.168.1.100
    rpcbind: server 192.168.1.100 not responding, timed out
    Root-NFS: Unable to get nfsd port number from server, using default
    Looking up port of RPC 100005/1 on 192.168.1.100
    rpcbind: server 192.168.1.100 not responding, timed out
    Root-NFS: Unable to get mountd port number from server, using default
    mount: server 192.168.1.100 not responding, timed out
    Root-NFS: Server returned error -5 while mounting /nfs/rootfs/
    VFS: Unable to mount root fs via NFS, trying floppy.
    Bad page state in process 'swapper'
    page:c02b1260 flags:0x00000400 mapping:00000000 mapcount:0 count:0
    Trying to fix it up, but a reboot is needed
    Backtrace:
    [<c0023e34>] (dump_stack+0x0/0x14) from [<c0062570>] (bad_page+0x70/0xac)
    [<c0062500>] (bad_page+0x0/0xac) from [<c0064914>] (free_hot_cold_page+0x80/0x178)
    [<c0064894>] (free_hot_cold_page+0x0/0x178) from [<c0064a74>] (free_hot_page+0x14/0x18)
    [<c0064a60>] (free_hot_page+0x0/0x18) from [<c0067078>] (put_page+0xf8/0x154)
    [<c0066f80>] (put_page+0x0/0x154) from [<c007dbc8>] (kfree+0xc8/0xd0)
    [<c007db00>] (kfree+0x0/0xd0) from [<c00cbb54>] (nfs_get_sb+0x230/0x710)
    [<c00cb924>] (nfs_get_sb+0x0/0x710) from [<c0084334>] (vfs_kern_mount+0x58/0xac)[<c00842dc>] (vfs_kern_mount+0x0/0xac) from [<c00843c0>] (do_kern_mount+0x38/0xf4)
    [<c0084388>] (do_kern_mount+0x0/0xf4) from [<c0099c7c>] (do_mount+0x1e8/0x614)
    ...
    
    This seems to be caused by use of an uninitialised structure due to NULL
    options being passed to nfs_validate_mount_data().  Ensure that the
    parsed mount data is always initialised.
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
         (Trond: added fix for the same bug in nfs4_validate_mount_data()).
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    f16c9603
super.c 46.3 KB