I got this message at runtime:
[ 326.069622] BUG: scheduling while atomic: swapper/0/0/0x40000100
[ 326.076037] Modules linked in: autofs4
[ 326.080079] [<c0013db8>] (unwind_backtrace+0x0/0x11c) from [<c04cfb84>]
(__schedule_bug+0x48/0x5c)
[ 326.089550] [<c04cfb84>] (__schedule_bug+0x48/0x5c) from [<c04e0f4c>]
(__schedule+0x68/0x5bc)
[ 326.098575] [<c04e0f4c>] (__schedule+0x68/0x5bc) from [<c0063f0c>]
(__cond_resched+0x24/0x34)
[ 326.107581] [<c0063f0c>] (__cond_resched+0x24/0x34) from [<c04e152c>]
(_cond_resched+0x34/0x44)
[ 326.116781] [<c04e152c>] (_cond_resched+0x34/0x44) from [<c00e9b28>]
(kmem_cache_alloc_trace+0x2c/0x158)
[ 326.126798] [<c00e9b28>] (kmem_cache_alloc_trace+0x2c/0x158) from
[<c04b874c>] (lowpan_header_create.part.3+0x30)
[ 326.138186] [<c04b874c>] (lowpan_header_create.part.3+0x30/0x79c) from
[<c03ebc04>] (neigh_connected_output+0x98)
[ 326.149488] [<c03ebc04>] (neigh_connected_output+0x98/0xd0) from
[<c0467d5c>] (ip6_finish_output2+0x374/0x45c)
[ 326.160052] [<c0467d5c>] (ip6_finish_output2+0x374/0x45c) from [<c0479bcc>]
(ndisc_send_skb+0x174/0x22c)
[ 326.170061] [<c0479bcc>] (ndisc_send_skb+0x174/0x22c) from [<c047afe4>]
(ndisc_send_ns+0x8c/0x94)
[ 326.179418] [<c047afe4>] (ndisc_send_ns+0x8c/0x94) from [<c047b0e8>]
(ndisc_solicit+0xfc/0x110)
[ 326.188593] [<c047b0e8>] (ndisc_solicit+0xfc/0x110) from [<c03ec348>]
(neigh_probe+0x60/0x84)
[ 326.197590] [<c03ec348>] (neigh_probe+0x60/0x84) from [<c03ed118>]
(neigh_timer_handler+0x1d4/0x238)
[ 326.207225] [<c03ed118>] (neigh_timer_handler+0x1d4/0x238) from [<c00451fc>]
(call_timer_fn+0x74/0x134)
[ 326.217138] [<c00451fc>] (call_timer_fn+0x74/0x134) from [<c0046984>]
(run_timer_softirq+0x258/0x2d4)
[ 326.226881] [<c0046984>] (run_timer_softirq+0x258/0x2d4) from [<c003fb84>]
(__do_softirq+0x118/0x248)
[ 326.236612] [<c003fb84>] (__do_softirq+0x118/0x248) from [<c003ff64>]
(irq_exit+0x44/0x84)
[ 326.245337] [<c003ff64>] (irq_exit+0x44/0x84) from [<c000e780>]
(handle_IRQ+0x7c/0xb8)
[ 326.253693] [<c000e780>] (handle_IRQ+0x7c/0xb8) from [<c000857c>]
(omap3_intc_handle_irq+0x54/0x68)
[ 326.263243] [<c000857c>] (omap3_intc_handle_irq+0x54/0x68) from [<c04e2900>]
(__irq_svc+0x40/0x50)
[ 326.272687] Exception stack(0xc074bf68 to 0xc074bfb0)
[ 326.278018] bf60: ffffffed 00000000 002f8000 00000000
c074a000 c07b6608
[ 326.286640] bf80: c04ec10c c0757618 80004059 413fc082 00000000 00000000
00000000 c074bfb0
[ 326.295262] bfa0: c000e904 c000e908 60000013 ffffffff
[ 326.300601] [<c04e2900>] (__irq_svc+0x40/0x50) from [<c000e908>]
(default_idle+0x24/0x2c)
[ 326.309228] [<c000e908>] (default_idle+0x24/0x2c) from [<c000ea7c>]
(cpu_idle+0x9c/0xf0)
[ 326.317787] [<c000ea7c>] (cpu_idle+0x9c/0xf0) from [<c06ff7dc>]
(start_kernel+0x258/0x2a4)
It seems lowpan_header_create is calling from a irq context.
So kzalloc need a GFP_ATOMIC flag instead GFP_KERNEL.
Also improve a comment codestyle.
There exist a similar fix for mac802154/wpan.c
Signed-off-by: Alexander Aring <alex.ar...@gmail.com>
---
net/ieee802154/6lowpan.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index f651da6..bc61d18 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -380,12 +380,13 @@ static int lowpan_header_create(struct sk_buff *skb,
u8 *head;
struct ieee802154_addr sa, da;
+ /* TODO:
+ * if this package isn't ipv6 one, where should it be routed?
+ */
if (type != ETH_P_IPV6)
return 0;
- /* TODO:
- * if this package isn't ipv6 one, where should it be routed?
- */
- head = kzalloc(100, GFP_KERNEL);
+
+ head = kzalloc(100, GFP_ATOMIC);
if (head == NULL)
return -ENOMEM;
--
1.8.1.2
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