forked from Minki/linux
ba51b6be38
Hit the following splat testing VRF change for ipsec:
[ 113.475692] ===============================
[ 113.476194] [ INFO: suspicious RCU usage. ]
[ 113.476667] 4.2.0-rc6-1+deb7u2+clUNRELEASED #3.2.65-1+deb7u2+clUNRELEASED Not tainted
[ 113.477545] -------------------------------
[ 113.478013] /work/monster-14/dsa/kernel.git/include/linux/rcupdate.h:568 Illegal context switch in RCU read-side critical section!
[ 113.479288]
[ 113.479288] other info that might help us debug this:
[ 113.479288]
[ 113.480207]
[ 113.480207] rcu_scheduler_active = 1, debug_locks = 1
[ 113.480931] 2 locks held by setkey/6829:
[ 113.481371] #0: (&net->xfrm.xfrm_cfg_mutex){+.+.+.}, at: [<ffffffff814e9887>] pfkey_sendmsg+0xfb/0x213
[ 113.482509] #1: (rcu_read_lock){......}, at: [<ffffffff814e767f>] rcu_read_lock+0x0/0x6e
[ 113.483509]
[ 113.483509] stack backtrace:
[ 113.484041] CPU: 0 PID: 6829 Comm: setkey Not tainted 4.2.0-rc6-1+deb7u2+clUNRELEASED #3.2.65-1+deb7u2+clUNRELEASED
[ 113.485422] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014
[ 113.486845] 0000000000000001 ffff88001d4c7a98 ffffffff81518af2 ffffffff81086962
[ 113.487732] ffff88001d538480 ffff88001d4c7ac8 ffffffff8107ae75 ffffffff8180a154
[ 113.488628] 0000000000000b30 0000000000000000 00000000000000d0 ffff88001d4c7ad8
[ 113.489525] Call Trace:
[ 113.489813] [<ffffffff81518af2>] dump_stack+0x4c/0x65
[ 113.490389] [<ffffffff81086962>] ? console_unlock+0x3d6/0x405
[ 113.491039] [<ffffffff8107ae75>] lockdep_rcu_suspicious+0xfa/0x103
[ 113.491735] [<ffffffff81064032>] rcu_preempt_sleep_check+0x45/0x47
[ 113.492442] [<ffffffff8106404d>] ___might_sleep+0x19/0x1c8
[ 113.493077] [<ffffffff81064268>] __might_sleep+0x6c/0x82
[ 113.493681] [<ffffffff81133190>] cache_alloc_debugcheck_before.isra.50+0x1d/0x24
[ 113.494508] [<ffffffff81134876>] kmem_cache_alloc+0x31/0x18f
[ 113.495149] [<ffffffff814012b5>] skb_clone+0x64/0x80
[ 113.495712] [<ffffffff814e6f71>] pfkey_broadcast_one+0x3d/0xff
[ 113.496380] [<ffffffff814e7b84>] pfkey_broadcast+0xb5/0x11e
[ 113.497024] [<ffffffff814e82d1>] pfkey_register+0x191/0x1b1
[ 113.497653] [<ffffffff814e9770>] pfkey_process+0x162/0x17e
[ 113.498274] [<ffffffff814e9895>] pfkey_sendmsg+0x109/0x213
In pfkey_sendmsg the net mutex is taken and then pfkey_broadcast takes
the RCU lock.
Since pfkey_broadcast takes the RCU lock the allocation argument is
pointless since GFP_ATOMIC must be used between the rcu_read_{,un}lock.
The one call outside of rcu can be done with GFP_KERNEL.
Fixes:
|
||
|---|---|---|
| .. | ||
| 6lowpan | ||
| 9p | ||
| 802 | ||
| 8021q | ||
| appletalk | ||
| atm | ||
| ax25 | ||
| batman-adv | ||
| bluetooth | ||
| bridge | ||
| caif | ||
| can | ||
| ceph | ||
| core | ||
| dcb | ||
| dccp | ||
| decnet | ||
| dns_resolver | ||
| dsa | ||
| ethernet | ||
| hsr | ||
| ieee802154 | ||
| ipv4 | ||
| ipv6 | ||
| ipx | ||
| irda | ||
| iucv | ||
| key | ||
| l2tp | ||
| lapb | ||
| llc | ||
| mac80211 | ||
| mac802154 | ||
| mpls | ||
| netfilter | ||
| netlabel | ||
| netlink | ||
| netrom | ||
| nfc | ||
| openvswitch | ||
| packet | ||
| phonet | ||
| rds | ||
| rfkill | ||
| rose | ||
| rxrpc | ||
| sched | ||
| sctp | ||
| sunrpc | ||
| switchdev | ||
| tipc | ||
| unix | ||
| vmw_vsock | ||
| wimax | ||
| wireless | ||
| x25 | ||
| xfrm | ||
| compat.c | ||
| Kconfig | ||
| Makefile | ||
| socket.c | ||
| sysctl_net.c | ||