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| author |   David Lebrun <david.lebrun@uclouvain.be> | 2017-01-12 21:30:01 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-01-13 12:29:55 -0500 |
| commit | fa79581ea66ca43d56ef065346ac5be767fcb418 (patch) | |
| tree | d683a22fc392c9eca7ff842e00c8c36df94b8005 /net/ipv6/seg6_iptunnel.c | |
| parent | net: systemport: Decouple flow control from __bcm_sysport_tx_reclaim (diff) | |
| download | linux-dev-fa79581ea66ca43d56ef065346ac5be767fcb418.tar.xz linux-dev-fa79581ea66ca43d56ef065346ac5be767fcb418.zip | |
ipv6: sr: fix several BUGs when preemption is enabled
When CONFIG_PREEMPT=y, CONFIG_IPV6=m and CONFIG_SEG6_HMAC=y,
seg6_hmac_init() is called during the initialization of the ipv6 module.
This causes a subsequent call to smp_processor_id() with preemption
enabled, resulting in the following trace.
[ 20.451460] BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1
[ 20.452556] caller is debug_smp_processor_id+0x17/0x19
[ 20.453304] CPU: 0 PID: 1 Comm: systemd Not tainted 4.9.0-rc5-00973-g46738b1 #1
[ 20.454406] ffffc9000062fc18 ffffffff813607b2 0000000000000000 ffffffff81a7f782
[ 20.455528] ffffc9000062fc48 ffffffff813778dc 0000000000000000 00000000001dcf98
[ 20.456539] ffffffffa003bd08 ffffffff81af93e0 ffffc9000062fc58 ffffffff81377905
[ 20.456539] Call Trace:
[ 20.456539] [<ffffffff813607b2>] dump_stack+0x63/0x7f
[ 20.456539] [<ffffffff813778dc>] check_preemption_disabled+0xd1/0xe3
[ 20.456539] [<ffffffff81377905>] debug_smp_processor_id+0x17/0x19
[ 20.460260] [<ffffffffa0061f3b>] seg6_hmac_init+0xfa/0x192 [ipv6]
[ 20.460260] [<ffffffffa0061ccc>] seg6_init+0x39/0x6f [ipv6]
[ 20.460260] [<ffffffffa006121a>] inet6_init+0x21a/0x321 [ipv6]
[ 20.460260] [<ffffffffa0061000>] ? 0xffffffffa0061000
[ 20.460260] [<ffffffff81000457>] do_one_initcall+0x8b/0x115
[ 20.460260] [<ffffffff811328a3>] do_init_module+0x53/0x1c4
[ 20.460260] [<ffffffff8110650a>] load_module+0x1153/0x14ec
[ 20.460260] [<ffffffff81106a7b>] SYSC_finit_module+0x8c/0xb9
[ 20.460260] [<ffffffff81106a7b>] ? SYSC_finit_module+0x8c/0xb9
[ 20.460260] [<ffffffff81106abc>] SyS_finit_module+0x9/0xb
[ 20.460260] [<ffffffff810014d1>] do_syscall_64+0x62/0x75
[ 20.460260] [<ffffffff816834f0>] entry_SYSCALL64_slow_path+0x25/0x25
Moreover, dst_cache_* functions also call smp_processor_id(), generating
a similar trace.
This patch uses raw_cpu_ptr() in seg6_hmac_init() rather than this_cpu_ptr()
and disable preemption when using dst_cache_* functions.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/seg6_iptunnel.c')
| -rw-r--r-- | net/ipv6/seg6_iptunnel.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c index bbfca22c34ae..1d60cb132835 100644 --- a/net/ipv6/seg6_iptunnel.c +++ b/net/ipv6/seg6_iptunnel.c @@ -265,7 +265,9 @@ int seg6_output(struct net *net, struct sock *sk, struct sk_buff *skb) slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate); #ifdef CONFIG_DST_CACHE + preempt_disable(); dst = dst_cache_get(&slwt->cache); + preempt_enable(); #endif if (unlikely(!dst)) { @@ -286,7 +288,9 @@ int seg6_output(struct net *net, struct sock *sk, struct sk_buff *skb) } #ifdef CONFIG_DST_CACHE + preempt_disable(); dst_cache_set_ip6(&slwt->cache, dst, &fl6.saddr); + preempt_enable(); #endif } |