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Date: Sat, 2 Apr 2016 15:55:53 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: "David S. Miller" <davem@...emloft.net>,
Nicolas Dichtel <nicolas.dichtel@...nd.com>,
Thomas Graf <tgraf@...g.ch>, netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>
Cc: syzkaller <syzkaller@...glegroups.com>,
Kostya Serebryany <kcc@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Sasha Levin <sasha.levin@...cle.com>
Subject: net: memory leak due to CLONE_NEWNET
Hello,
The following program leads to memory leaks in:
unreferenced object 0xffff88005c10d208 (size 96):
comm "a.out", pid 10753, jiffies 4296778619 (age 43.118s)
hex dump (first 32 bytes):
e8 31 85 2d 00 88 ff ff 0f 00 00 00 00 00 00 00 .1.-............
00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
backtrace:
[<ffffffff8679bb23>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:915
[< inline >] kmemleak_alloc_recursive include/linux/kmemleak.h:47
[< inline >] slab_post_alloc_hook mm/slab.h:406
[< inline >] slab_alloc_node mm/slub.c:2602
[< inline >] slab_alloc mm/slub.c:2610
[<ffffffff8179b4c0>] kmem_cache_alloc_trace+0x160/0x3d0 mm/slub.c:2627
[< inline >] kmalloc include/linux/slab.h:478
[< inline >] tc_action_net_init include/net/act_api.h:122
[<ffffffff8574e62e>] csum_init_net+0x15e/0x450 net/sched/act_csum.c:593
[<ffffffff8564ffc9>] ops_init+0xa9/0x3a0 net/core/net_namespace.c:109
[<ffffffff85650474>] setup_net+0x1b4/0x3e0 net/core/net_namespace.c:287
[<ffffffff85651a56>] copy_net_ns+0xd6/0x1a0 net/core/net_namespace.c:367
[<ffffffff813d01bf>] create_new_namespaces+0x37f/0x740 kernel/nsproxy.c:106
[<ffffffff813d0b69>] unshare_nsproxy_namespaces+0xa9/0x1d0
kernel/nsproxy.c:205
[< inline >] SYSC_unshare kernel/fork.c:2019
[<ffffffff81365283>] SyS_unshare+0x3b3/0x800 kernel/fork.c:1969
[<ffffffff867b9400>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff88005c10e1c8 (size 96):
comm "a.out", pid 10753, jiffies 4296778620 (age 43.117s)
hex dump (first 32 bytes):
e8 0b 85 2d 00 88 ff ff 0f 00 00 00 00 00 ad de ...-............
00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
backtrace:
[<ffffffff8679bb23>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:915
[< inline >] kmemleak_alloc_recursive include/linux/kmemleak.h:47
[< inline >] slab_post_alloc_hook mm/slab.h:406
[< inline >] slab_alloc_node mm/slub.c:2602
[< inline >] slab_alloc mm/slub.c:2610
[<ffffffff8179b4c0>] kmem_cache_alloc_trace+0x160/0x3d0 mm/slub.c:2627
[< inline >] kmalloc include/linux/slab.h:478
[< inline >] tc_action_net_init include/net/act_api.h:122
[<ffffffff85753f7e>] ife_init_net+0x15e/0x450 net/sched/act_ife.c:838
[<ffffffff8564ffc9>] ops_init+0xa9/0x3a0 net/core/net_namespace.c:109
[<ffffffff85650474>] setup_net+0x1b4/0x3e0 net/core/net_namespace.c:287
[<ffffffff85651a56>] copy_net_ns+0xd6/0x1a0 net/core/net_namespace.c:367
[<ffffffff813d01bf>] create_new_namespaces+0x37f/0x740 kernel/nsproxy.c:106
[<ffffffff813d0b69>] unshare_nsproxy_namespaces+0xa9/0x1d0
kernel/nsproxy.c:205
[< inline >] SYSC_unshare kernel/fork.c:2019
[<ffffffff81365283>] SyS_unshare+0x3b3/0x800 kernel/fork.c:1969
[<ffffffff867b9400>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880025a55b08 (size 96):
comm "a.out", pid 10702, jiffies 4296768144 (age 61.526s)
hex dump (first 32 bytes):
28 ed 55 2b 00 88 ff ff 0f 00 00 00 00 00 00 00 (.U+............
00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........
backtrace:
[<ffffffff8679bb23>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:915
[< inline >] kmemleak_alloc_recursive include/linux/kmemleak.h:47
[< inline >] slab_post_alloc_hook mm/slab.h:406
[< inline >] slab_alloc_node mm/slub.c:2602
[< inline >] slab_alloc mm/slub.c:2610
[<ffffffff8179b4c0>] kmem_cache_alloc_trace+0x160/0x3d0 mm/slub.c:2627
[< inline >] kmalloc include/linux/slab.h:478
[< inline >] tc_action_net_init include/net/act_api.h:122
[<ffffffff8574890e>] nat_init_net+0x15e/0x450 net/sched/act_nat.c:311
[<ffffffff8564ffc9>] ops_init+0xa9/0x3a0 net/core/net_namespace.c:109
[<ffffffff85650474>] setup_net+0x1b4/0x3e0 net/core/net_namespace.c:287
[<ffffffff85651a56>] copy_net_ns+0xd6/0x1a0 net/core/net_namespace.c:367
[<ffffffff813d01bf>] create_new_namespaces+0x37f/0x740 kernel/nsproxy.c:106
[<ffffffff813d0b69>] unshare_nsproxy_namespaces+0xa9/0x1d0
kernel/nsproxy.c:205
[< inline >] SYSC_unshare kernel/fork.c:2019
[<ffffffff81365283>] SyS_unshare+0x3b3/0x800 kernel/fork.c:1969
[<ffffffff867b9400>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
[<ffffffffffffffff>] 0xffffffffffffffff
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <linux/sched.h>
int main()
{
int pid, status;
pid = fork();
if (pid == 0) {
unshare(CLONE_NEWNET);
exit(0);
}
while (waitpid(pid, &status, 0) != pid) {
}
return 0;
}
grep "kmalloc-96" /proc/slabinfo confirms the leak.
I am on commit 05cf8077e54b20dddb756eaa26f3aeb5c38dd3cf (Apr 1).
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