On Tue, 05 Aug 2014 21:20:27 +0800
Kinglong Mee <kinglongmee@xxxxxxxxx> wrote:
> After testing nfs4 lock, I restart the nfsd service, got messages as,
>
> [ 5677.403419] nfsd: last server has exited, flushing export cache
> [ 5677.463728] =============================================================================
> [ 5677.463942] BUG nfsd4_files (Tainted: G B OE): Objects remaining in nfsd4_files on kmem_cache_close()
> [ 5677.464055] -----------------------------------------------------------------------------
>
> [ 5677.464203] INFO: Slab 0xffffea0000233400 objects=28 used=1 fp=0xffff880008cd3d98 flags=0x3ffc0000004080
> [ 5677.464318] CPU: 0 PID: 3772 Comm: rmmod Tainted: G B OE 3.16.0-rc2+ #29
> [ 5677.464420] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
> [ 5677.464538] 0000000000000000 0000000036af2c9f ffff88000ce97d68 ffffffff816eacfa
> [ 5677.464643] ffffea0000233400 ffff88000ce97e40 ffffffff811cda44 ffffffff00000020
> [ 5677.464774] ffff88000ce97e50 ffff88000ce97e00 656a624f00000008 616d657220737463
> [ 5677.464875] Call Trace:
> [ 5677.464925] [<ffffffff816eacfa>] dump_stack+0x45/0x56
> [ 5677.464983] [<ffffffff811cda44>] slab_err+0xb4/0xe0
> [ 5677.465040] [<ffffffff811d0457>] ? __kmalloc+0x117/0x290
> [ 5677.465099] [<ffffffff81100eec>] ? on_each_cpu_cond+0xac/0xf0
> [ 5677.465158] [<ffffffff811d1bc0>] ? kmem_cache_close+0x110/0x2e0
> [ 5677.465218] [<ffffffff811d1be0>] kmem_cache_close+0x130/0x2e0
> [ 5677.465279] [<ffffffff8135a0c1>] ? kobject_cleanup+0x91/0x1b0
> [ 5677.465338] [<ffffffff811d22be>] __kmem_cache_shutdown+0xe/0x10
> [ 5677.465399] [<ffffffff8119bd28>] kmem_cache_destroy+0x48/0x100
> [ 5677.465466] [<ffffffffa05ef78d>] nfsd4_free_slabs+0x2d/0x50 [nfsd]
> [ 5677.465530] [<ffffffffa05fa987>] exit_nfsd+0x34/0x6ad [nfsd]
> [ 5677.465589] [<ffffffff81104ac2>] SyS_delete_module+0x162/0x200
> [ 5677.465649] [<ffffffff81013b69>] ? do_notify_resume+0x59/0x90
> [ 5677.465759] [<ffffffff816f2369>] system_call_fastpath+0x16/0x1b
> [ 5677.465822] INFO: Object 0xffff880008cd0000 @offset=0
> [ 5677.465882] INFO: Allocated in nfsd4_process_open1+0x61/0x350 [nfsd] age=7599 cpu=0 pid=3253
> [ 5677.466115] __slab_alloc+0x3b0/0x4b1
> [ 5677.466166] kmem_cache_alloc+0x1e4/0x240
> [ 5677.466220] nfsd4_process_open1+0x61/0x350 [nfsd]
> [ 5677.466276] nfsd4_open+0xee/0x860 [nfsd]
> [ 5677.466329] nfsd4_proc_compound+0x4d7/0x7f0 [nfsd]
> [ 5677.466384] nfsd_dispatch+0xbb/0x200 [nfsd]
> [ 5677.466447] svc_process_common+0x453/0x6f0 [sunrpc]
> [ 5677.466506] svc_process+0x103/0x170 [sunrpc]
> [ 5677.466559] nfsd+0x117/0x190 [nfsd]
> [ 5677.466609] kthread+0xd8/0xf0
> [ 5677.466656] ret_from_fork+0x7c/0xb0
> [ 5677.466775] kmem_cache_destroy nfsd4_files: Slab cache still has objects
> [ 5677.466839] CPU: 0 PID: 3772 Comm: rmmod Tainted: G B OE 3.16.0-rc2+ #29
> [ 5677.466937] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
> [ 5677.467049] 0000000000000000 0000000036af2c9f ffff88000ce97eb0 ffffffff816eacfa
> [ 5677.467150] ffff880020bb2d00 ffff88000ce97ed0 ffffffff8119bdd9 0000000000000000
> [ 5677.467250] ffffffffa06065c0 ffff88000ce97ee0 ffffffffa05ef78d ffff88000ce97ef0
> [ 5677.467351] Call Trace:
> [ 5677.467397] [<ffffffff816eacfa>] dump_stack+0x45/0x56
> [ 5677.467454] [<ffffffff8119bdd9>] kmem_cache_destroy+0xf9/0x100
> [ 5677.467516] [<ffffffffa05ef78d>] nfsd4_free_slabs+0x2d/0x50 [nfsd]
> [ 5677.467579] [<ffffffffa05fa987>] exit_nfsd+0x34/0x6ad [nfsd]
> [ 5677.467639] [<ffffffff81104ac2>] SyS_delete_module+0x162/0x200
> [ 5677.467765] [<ffffffff81013b69>] ? do_notify_resume+0x59/0x90
> [ 5677.467826] [<ffffffff816f2369>] system_call_fastpath+0x16/0x1b
>
> Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
> ---
> fs/nfsd/nfs4state.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 56999cb..e87005d 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -1037,6 +1037,7 @@ static void
> free_ol_stateid_reaplist(struct list_head *reaplist)
> {
> struct nfs4_ol_stateid *stp;
> + struct nfs4_file *fp;
>
> might_sleep();
>
> @@ -1044,7 +1045,10 @@ free_ol_stateid_reaplist(struct list_head *reaplist)
> stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
> st_locks);
> list_del(&stp->st_locks);
> + fp = stp->st_stid.sc_file;
> stp->st_stid.sc_free(&stp->st_stid);
> + if (fp)
> + put_nfs4_file(fp);
> }
> }
>
Well spotted. I missed that when moved the nfs4_file handling out of
sc_free.
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
