linux-kernel - Re: [PATCH v2 0/3] auth_gss: netns refcount leaks when use-gss-proxy==1

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Date:   Tue, 14 May 2019 21:03:31 -0400
From:   "J. Bruce Fields" <bfields@...ldses.org>
To:     Wenbin Zeng <wenbin.zeng@...il.com>
Cc:     viro@...iv.linux.org.uk, davem@...emloft.net, jlayton@...nel.org,
        trond.myklebust@...merspace.com, anna.schumaker@...app.com,
        wenbinzeng@...cent.com, dsahern@...il.com,
        nicolas.dichtel@...nd.com, willy@...radead.org,
        edumazet@...gle.com, jakub.kicinski@...ronome.com,
        tyhicks@...onical.com, chuck.lever@...cle.com, neilb@...e.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH v2 0/3] auth_gss: netns refcount leaks when
 use-gss-proxy==1

Whoops, I was slow to test these.  I'm getting failuring krb5 nfs
mounts, and the following the server's logs.  Dropping the three patches
for now.

--b.

[   40.894408] remove_proc_entry: removing non-empty directory 'net/rpc', leaking at least 'use-gss-proxy'
[   40.897352] WARNING: CPU: 2 PID: 31 at fs/proc/generic.c:683 remove_proc_entry+0x17d/0x190
[   40.899373] Modules linked in: nfsd nfs_acl lockd grace auth_rpcgss sunrpc
[   40.901335] CPU: 2 PID: 31 Comm: kworker/u8:1 Not tainted 5.1.0-10733-g4f10d1cb695e #2220
[   40.903759] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20180724_192412-buildhw-07.phx2.fedoraproject.org-1.fc29 04/01/2014
[   40.906972] Workqueue: netns cleanup_net
[   40.907828] RIP: 0010:remove_proc_entry+0x17d/0x190
[   40.908904] Code: 52 82 48 85 c0 48 8d 90 48 ff ff ff 48 0f 45 c2 48 8b 93 a8 00 00 00 4c 8b 80 d0 00 00 00 48 8b 92 d0 00 00 00 e8 a7 24 dc ff <0f> 0b e9 52 ff ff ff e8 a7 21 dc ff 0f 1f 80 00 00 00 00 0f 1f 44
[   40.912689] RSP: 0018:ffffc90000123d80 EFLAGS: 00010282
[   40.913495] RAX: 0000000000000000 RBX: ffff888079f96e40 RCX: 0000000000000000
[   40.914747] RDX: ffff88807fd24e80 RSI: ffff88807fd165b8 RDI: 00000000ffffffff
[   40.916107] RBP: ffff888079f96ef0 R08: 0000000000000000 R09: 0000000000000000
[   40.917253] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807cd76d68
[   40.918508] R13: ffffffffa0057000 R14: ffff8880683db200 R15: ffffffff82970240
[   40.919642] FS:  0000000000000000(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000
[   40.920956] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   40.921867] CR2: 00007f9d70010cb8 CR3: 000000007cc5c006 CR4: 00000000001606e0
[   40.923044] Call Trace:
[   40.923364]  sunrpc_exit_net+0xcc/0x190 [sunrpc]
[   40.924069]  ops_exit_list.isra.0+0x36/0x70
[   40.924713]  cleanup_net+0x1cb/0x2c0
[   40.925182]  process_one_work+0x219/0x620
[   40.925780]  worker_thread+0x3c/0x390
[   40.926312]  ? process_one_work+0x620/0x620
[   40.927015]  kthread+0x11d/0x140
[   40.927430]  ? kthread_park+0x80/0x80
[   40.927822]  ret_from_fork+0x3a/0x50
[   40.928281] irq event stamp: 11688
[   40.928780] hardirqs last  enabled at (11687): [<ffffffff811225fe>] console_unlock+0x41e/0x590
[   40.930319] hardirqs last disabled at (11688): [<ffffffff81001b2c>] trace_hardirqs_off_thunk+0x1a/0x1c
[   40.932123] softirqs last  enabled at (11684): [<ffffffff820002c5>] __do_softirq+0x2c5/0x4c5
[   40.933657] softirqs last disabled at (11673): [<ffffffff810bf970>] irq_exit+0x80/0x90