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Date: Wed, 16 Nov 2016 17:10:37 +0800
From: kbuild test robot <lkp@...el.com>
To: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: kbuild-all@...org, avagin@...il.com, davem@...emloft.net,
netdev@...r.kernel.org, xiyou.wangcong@...il.com,
Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: Re: [PATCH net] net: nsid cannot be allocated for a dead netns
Hi Nicolas,
[auto build test ERROR on net/master]
url: https://github.com/0day-ci/linux/commits/Nicolas-Dichtel/net-nsid-cannot-be-allocated-for-a-dead-netns/20161116-164739
config: i386-randconfig-x006-201646 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All error/warnings (new ones prefixed by >>):
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/timer.h:4,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
net/core/net_namespace.c: In function 'alloc_netid':
>> net/core/net_namespace.c:162:49: error: incompatible type for argument 1 of 'atomic_read'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> net/core/net_namespace.c:162:2: note: in expansion of macro 'if'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^~
In file included from arch/x86/include/asm/msr.h:66:0,
from arch/x86/include/asm/processor.h:20,
from arch/x86/include/asm/cpufeature.h:4,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:58,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/ktime.h:24,
from include/linux/timer.h:5,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
arch/x86/include/asm/atomic.h:24:28: note: expected 'const atomic_t * {aka const struct <anonymous> *}' but argument is of type 'atomic_t {aka struct <anonymous>}'
static __always_inline int atomic_read(const atomic_t *v)
^~~~~~~~~~~
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/timer.h:4,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
>> net/core/net_namespace.c:162:49: error: incompatible type for argument 1 of 'atomic_read'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^
include/linux/compiler.h:149:42: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> net/core/net_namespace.c:162:2: note: in expansion of macro 'if'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^~
In file included from arch/x86/include/asm/msr.h:66:0,
from arch/x86/include/asm/processor.h:20,
from arch/x86/include/asm/cpufeature.h:4,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:58,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/ktime.h:24,
from include/linux/timer.h:5,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
arch/x86/include/asm/atomic.h:24:28: note: expected 'const atomic_t * {aka const struct <anonymous> *}' but argument is of type 'atomic_t {aka struct <anonymous>}'
static __always_inline int atomic_read(const atomic_t *v)
^~~~~~~~~~~
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/timer.h:4,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
>> net/core/net_namespace.c:162:49: error: incompatible type for argument 1 of 'atomic_read'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^
include/linux/compiler.h:160:16: note: in definition of macro '__trace_if'
______r = !!(cond); \
^~~~
>> net/core/net_namespace.c:162:2: note: in expansion of macro 'if'
if (!atomic_read(&net->count) || !&atomic_read(peer->count))
^~
In file included from arch/x86/include/asm/msr.h:66:0,
from arch/x86/include/asm/processor.h:20,
from arch/x86/include/asm/cpufeature.h:4,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:58,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/ktime.h:24,
from include/linux/timer.h:5,
from include/linux/workqueue.h:8,
from net/core/net_namespace.c:3:
arch/x86/include/asm/atomic.h:24:28: note: expected 'const atomic_t * {aka const struct <anonymous> *}' but argument is of type 'atomic_t {aka struct <anonymous>}'
static __always_inline int atomic_read(const atomic_t *v)
^~~~~~~~~~~
vim +/atomic_read +162 net/core/net_namespace.c
1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
> 3 #include <linux/workqueue.h>
4 #include <linux/rtnetlink.h>
5 #include <linux/cache.h>
6 #include <linux/slab.h>
7 #include <linux/list.h>
8 #include <linux/delay.h>
9 #include <linux/sched.h>
10 #include <linux/idr.h>
11 #include <linux/rculist.h>
12 #include <linux/nsproxy.h>
13 #include <linux/fs.h>
14 #include <linux/proc_ns.h>
15 #include <linux/file.h>
16 #include <linux/export.h>
17 #include <linux/user_namespace.h>
18 #include <linux/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/netlink.h>
21 #include <net/net_namespace.h>
22 #include <net/netns/generic.h>
23
24 /*
25 * Our network namespace constructor/destructor lists
26 */
27
28 static LIST_HEAD(pernet_list);
29 static struct list_head *first_device = &pernet_list;
30 DEFINE_MUTEX(net_mutex);
31
32 LIST_HEAD(net_namespace_list);
33 EXPORT_SYMBOL_GPL(net_namespace_list);
34
35 struct net init_net = {
36 .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
37 };
38 EXPORT_SYMBOL(init_net);
39
40 static bool init_net_initialized;
41
42 #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */
43
44 static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
45
46 static struct net_generic *net_alloc_generic(void)
47 {
48 struct net_generic *ng;
49 size_t generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]);
50
51 ng = kzalloc(generic_size, GFP_KERNEL);
52 if (ng)
53 ng->len = max_gen_ptrs;
54
55 return ng;
56 }
57
58 static int net_assign_generic(struct net *net, int id, void *data)
59 {
60 struct net_generic *ng, *old_ng;
61
62 BUG_ON(!mutex_is_locked(&net_mutex));
63 BUG_ON(id == 0);
64
65 old_ng = rcu_dereference_protected(net->gen,
66 lockdep_is_held(&net_mutex));
67 ng = old_ng;
68 if (old_ng->len >= id)
69 goto assign;
70
71 ng = net_alloc_generic();
72 if (ng == NULL)
73 return -ENOMEM;
74
75 /*
76 * Some synchronisation notes:
77 *
78 * The net_generic explores the net->gen array inside rcu
79 * read section. Besides once set the net->gen->ptr[x]
80 * pointer never changes (see rules in netns/generic.h).
81 *
82 * That said, we simply duplicate this array and schedule
83 * the old copy for kfree after a grace period.
84 */
85
86 memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*));
87
88 rcu_assign_pointer(net->gen, ng);
89 kfree_rcu(old_ng, rcu);
90 assign:
91 ng->ptr[id - 1] = data;
92 return 0;
93 }
94
95 static int ops_init(const struct pernet_operations *ops, struct net *net)
96 {
97 int err = -ENOMEM;
98 void *data = NULL;
99
100 if (ops->id && ops->size) {
101 data = kzalloc(ops->size, GFP_KERNEL);
102 if (!data)
103 goto out;
104
105 err = net_assign_generic(net, *ops->id, data);
106 if (err)
107 goto cleanup;
108 }
109 err = 0;
110 if (ops->init)
111 err = ops->init(net);
112 if (!err)
113 return 0;
114
115 cleanup:
116 kfree(data);
117
118 out:
119 return err;
120 }
121
122 static void ops_free(const struct pernet_operations *ops, struct net *net)
123 {
124 if (ops->id && ops->size) {
125 int id = *ops->id;
126 kfree(net_generic(net, id));
127 }
128 }
129
130 static void ops_exit_list(const struct pernet_operations *ops,
131 struct list_head *net_exit_list)
132 {
133 struct net *net;
134 if (ops->exit) {
135 list_for_each_entry(net, net_exit_list, exit_list)
136 ops->exit(net);
137 }
138 if (ops->exit_batch)
139 ops->exit_batch(net_exit_list);
140 }
141
142 static void ops_free_list(const struct pernet_operations *ops,
143 struct list_head *net_exit_list)
144 {
145 struct net *net;
146 if (ops->size && ops->id) {
147 list_for_each_entry(net, net_exit_list, exit_list)
148 ops_free(ops, net);
149 }
150 }
151
152 /* should be called with nsid_lock held */
153 static int alloc_netid(struct net *net, struct net *peer, int reqid)
154 {
155 int min = 0, max = 0;
156
157 if (reqid >= 0) {
158 min = reqid;
159 max = reqid + 1;
160 }
161
> 162 if (!atomic_read(&net->count) || !&atomic_read(peer->count))
163 return -EINVAL;
164
165 return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);
---
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