On Mon, Apr 20, 2015 at 06:00:08PM +0200, Giuseppe Cantavenera wrote:
> nfsd triggered a BUG_ON in net_generic(...) when rpc_pipefs_event(...)
> in fs/nfsd/nfs4recover.c was called before assigning ntfsd_net_id.
> The following was observed on a MIPS 32-core processor:
> kernel: Call Trace:
> kernel: [<ffffffffc00bc5e4>] rpc_pipefs_event+0x7c/0x158 [nfsd]
> kernel: [<ffffffff8017a2a0>] notifier_call_chain+0x70/0xb8
> kernel: [<ffffffff8017a4e4>] __blocking_notifier_call_chain+0x4c/0x70
> kernel: [<ffffffff8053aff8>] rpc_fill_super+0xf8/0x1a0
> kernel: [<ffffffff8022204c>] mount_ns+0xb4/0xf0
> kernel: [<ffffffff80222b48>] mount_fs+0x50/0x1f8
> kernel: [<ffffffff8023dc00>] vfs_kern_mount+0x58/0xf0
> kernel: [<ffffffff802404ac>] do_mount+0x27c/0xa28
> kernel: [<ffffffff80240cf0>] SyS_mount+0x98/0xe8
> kernel: [<ffffffff80135d24>] handle_sys64+0x44/0x68
> kernel:
> kernel:
> Code: 0040f809 00000000 2e020001 <00020336> 3c12c00d
> 3c02801a de100000 6442eb98 0040f809
> kernel: ---[ end trace 7471374335809536 ]---
>
> Fixed this behaviour by calling register_pernet_subsys(&nfsd_net_ops) before
> registering rpc_pipefs_event(...) with the notifier chain.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Giuseppe Cantavenera <giuseppe.cantavenera.ext@xxxxxxxxx>
> Signed-off-by: Lorenzo Restelli <lorenzo.restelli.ext@xxxxxxxxx>
> ---
> v2: Rebased, retested, added CC for the stable tree,
> minor changes to the commit message
Got it, thanks.--b.
>
> The previous version was not from the mainline,
> sorry for that.
>
> Regards,
> Giuseppe
>
> fs/nfsd/nfsctl.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index aa47d75..9690cb4 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -1250,15 +1250,15 @@ static int __init init_nfsd(void)
> int retval;
> printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).\n");
>
> - retval = register_cld_notifier();
> - if (retval)
> - return retval;
> retval = register_pernet_subsys(&nfsd_net_ops);
> if (retval < 0)
> - goto out_unregister_notifier;
> - retval = nfsd4_init_slabs();
> + return retval;
> + retval = register_cld_notifier();
> if (retval)
> goto out_unregister_pernet;
> + retval = nfsd4_init_slabs();
> + if (retval)
> + goto out_unregister_notifier;
> retval = nfsd4_init_pnfs();
> if (retval)
> goto out_free_slabs;
> @@ -1290,10 +1290,10 @@ out_exit_pnfs:
> nfsd4_exit_pnfs();
> out_free_slabs:
> nfsd4_free_slabs();
> -out_unregister_pernet:
> - unregister_pernet_subsys(&nfsd_net_ops);
> out_unregister_notifier:
> unregister_cld_notifier();
> +out_unregister_pernet:
> + unregister_pernet_subsys(&nfsd_net_ops);
> return retval;
> }
>
> @@ -1308,8 +1308,8 @@ static void __exit exit_nfsd(void)
> nfsd4_exit_pnfs();
> nfsd_fault_inject_cleanup();
> unregister_filesystem(&nfsd_fs_type);
> - unregister_pernet_subsys(&nfsd_net_ops);
> unregister_cld_notifier();
> + unregister_pernet_subsys(&nfsd_net_ops);
> }
>
> MODULE_AUTHOR("Olaf Kirch <okir@xxxxxxxxxxxx>");
> --
> 1.9.1
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