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Paul E. McKenney 1144182a87 net: suppress RCU lockdep false positive in sock_update_classid ... > =================================================== > [ INFO: suspicious rcu_dereference_check() usage. ] > --------------------------------------------------- > include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection! > > other info that might help us debug this: > > > rcu_scheduler_active = 1, debug_locks = 0 > 1 lock held by swapper/1: > #0: (net_mutex){+.+.+.}, at: [<ffffffff813e9010>] > register_pernet_subsys+0x1f/0x47 > > stack backtrace: > Pid: 1, comm: swapper Not tainted 2.6.35.4-28.fc14.x86_64 #1 > Call Trace: > [<ffffffff8107bd3a>] lockdep_rcu_dereference+0xaa/0xb3 > [<ffffffff813e04b9>] sock_update_classid+0x7c/0xa2 > [<ffffffff813e054a>] sk_alloc+0x6b/0x77 > [<ffffffff8140b281>] __netlink_create+0x37/0xab > [<ffffffff813f941c>] ? rtnetlink_rcv+0x0/0x2d > [<ffffffff8140cee1>] netlink_kernel_create+0x74/0x19d > [<ffffffff8149c3ca>] ? __mutex_lock_common+0x339/0x35b > [<ffffffff813f7e9c>] rtnetlink_net_init+0x2e/0x48 > [<ffffffff813e8d7a>] ops_init+0xe9/0xff > [<ffffffff813e8f0d>] register_pernet_operations+0xab/0x130 > [<ffffffff813e901f>] register_pernet_subsys+0x2e/0x47 > [<ffffffff81db7bca>] rtnetlink_init+0x53/0x102 > [<ffffffff81db835c>] netlink_proto_init+0x126/0x143 > [<ffffffff81db8236>] ? netlink_proto_init+0x0/0x143 > [<ffffffff810021b8>] do_one_initcall+0x72/0x186 > [<ffffffff81d78ebc>] kernel_init+0x23b/0x2c9 > [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10 > [<ffffffff8149e2d0>] ? restore_args+0x0/0x30 > [<ffffffff81d78c81>] ? kernel_init+0x0/0x2c9 > [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10 The sock_update_classid() function calls task_cls_classid(current), but the calling task cannot go away, so there is no danger of the associated structures disappearing. Insert an RCU read-side critical section to suppress the false positive. Reported-by: Subrata Modak <subrata@linux.vnet.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>		15 years ago
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9p	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	15 years ago
802	…
8021q	vlan: dont drop packets from unknown vlans in promiscuous mode	15 years ago
appletalk	…
atm	br2684: fix scheduling while atomic	15 years ago
ax25	ax25: missplaced sock_put(sk)	15 years ago
bluetooth	Bluetooth: Fix incorrect setting of remote_tx_win for L2CAP ERTM	15 years ago
bridge	bridge: Clear INET control block of SKBs passed into ip_fragment().	15 years ago
caif	net/caif/cfrfml.c: use asm/unaligned.h	15 years ago
can	can: add limit for nframes and clean up signed/unsigned variables	15 years ago
core	net: suppress RCU lockdep false positive in sock_update_classid	15 years ago
dcb	…
dccp	net: dccp: fix sign bug	15 years ago
decnet	…
dns_resolver	DNS: If the DNS server returns an error, allow that to be cached [ver #2]	15 years ago
dsa	phylib: available for any speed ethernet	15 years ago
econet	…
ethernet	Net: ethernet: pe2.c: fix EXPORT_SYMBOL macro code style issue	15 years ago
ieee802154	…
ipv4	Merge commit 'v2.6.36-rc7' into core/rcu	15 years ago
ipv6	ipv6: add IPv6 to neighbour table overflow warning	15 years ago
ipx	…
irda	irda: off by one	15 years ago
iucv	…
key	…
l2tp	l2tp: test for ethernet header in l2tp_eth_dev_recv()	15 years ago
lapb	…
llc	net/llc: storing negative error codes in unsigned short	15 years ago
mac80211	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6	15 years ago
netfilter	Merge commit 'v2.6.36-rc7' into core/rcu	15 years ago
netlabel	…
netlink	netlink: Make NETLINK_USERSOCK work again.	15 years ago
netrom	…
packet	…
phonet	Phonet: Correct header retrieval after pskb_may_pull	15 years ago
rds	net: fix a lockdep splat	15 years ago
rfkill	…
rose	rose: Fix signedness issues wrt. digi count.	15 years ago
rxrpc	Add a dummy printk function for the maintenance of unused printks	15 years ago
sched	sch_atm: Fix potential NULL deref.	15 years ago
sctp	sctp: Do not reset the packet during sctp_packet_config().	15 years ago
sunrpc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	15 years ago
tipc	…
unix	UNIX: Do not loop forever at unix_autobind().	15 years ago
wanrouter	net: autoconvert trivial BKL users to private mutex	15 years ago
wimax	…
wireless	wext: fix potential private ioctl memory content leak	15 years ago
x25	…
xfrm	xfrm: Allow different selector family in temporary state	15 years ago
Kconfig	net: RPS needs to depend upon USE_GENERIC_SMP_HELPERS	15 years ago
Makefile	DNS: Separate out CIFS DNS Resolver code	15 years ago
TUNABLE	…
compat.c	…
nonet.c	…
socket.c	net: support time stamping in phy devices.	15 years ago
sysctl_net.c	…