Ipset 6.26 produces the following splat: BUG: sleeping function called from invalid context at mm/page_alloc.c:2759 in_atomic(): 1, irqs_disabled(): 0, pid: 9664, name: ipset CPU: 18 PID: 9664 Comm: ipset Tainted: G O 3.12.47-clouder3 #1 Hardware name: Supermicro X10DRi/X10DRi, BIOS 1.1 04/14/2015 0000000000000002 ffff881fd14273c8 ffffffff8163d891 ffff881fcb4264b0 ffff881fcb4260c0 ffff881fd14273e8 ffffffff810ba5bf ffff881fd1427558 0000000000000000 ffff881fd1427568 ffffffff81142b33 ffff881f00000000 Call Trace: [<ffffffff8163d891>] dump_stack+0x58/0x7f [<ffffffff810ba5bf>] __might_sleep+0xdf/0x110 [<ffffffff81142b33>] __alloc_pages_nodemask+0x243/0xc20 [<ffffffff81181c6e>] alloc_pages_current+0xbe/0x170 [<ffffffff81188315>] new_slab+0x295/0x340 [<ffffffff81189a40>] __slab_alloc+0x2c0/0x5a0 [<ffffffff8164000c>] ? __schedule+0x2dc/0x760 [<ffffffff8118a71b>] __kmalloc+0x11b/0x230 [<ffffffffa02bd0ac>] ? ip_set_get_byname+0xec/0x100 [ip_set] [<ffffffffa02d23fb>] list_set_uadd+0x16b/0x314 [ip_set_list_set] [<ffffffff81642148>] ? _raw_write_unlock_bh+0x28/0x30 [<ffffffffa02d1cfc>] list_set_uadt+0x21c/0x320 [ip_set_list_set] [<ffffffffa02d2290>] ? list_set_create+0x1a0/0x1a0 [ip_set_list_set] [<ffffffffa02be242>] call_ad+0x82/0x200 [ip_set] [<ffffffffa02bb171>] ? find_set_type+0x51/0xa0 [ip_set] [<ffffffff8133f275>] ? nla_parse+0xf5/0x130 [<ffffffffa02be8ae>] ip_set_uadd+0x20e/0x2d0 [ip_set] [<ffffffffa02be013>] ? ip_set_create+0x2a3/0x450 [ip_set] [<ffffffffa02be6a0>] ? ip_set_udel+0x2e0/0x2e0 [ip_set] [<ffffffff815b316e>] nfnetlink_rcv_msg+0x31e/0x330 [<ffffffff815b2e91>] ? nfnetlink_rcv_msg+0x41/0x330 [<ffffffff815b2e50>] ? nfnl_lock+0x30/0x30 [<ffffffff815ae179>] netlink_rcv_skb+0xa9/0xd0 [<ffffffff815b2d45>] nfnetlink_rcv+0x15/0x20 [<ffffffff815ade5f>] netlink_unicast+0x10f/0x190 [<ffffffff815aedb0>] netlink_sendmsg+0x2c0/0x660 [<ffffffff81567f00>] sock_sendmsg+0x90/0xc0 [<ffffffff81565b03>] ? move_addr_to_user+0xa3/0xc0 [<ffffffff81568552>] ? ___sys_recvmsg+0x182/0x300 [<ffffffff81568064>] SYSC_sendto+0x134/0x180 [<ffffffff811c4e01>] ? mntput+0x21/0x30 [<ffffffff81572d2f>] ? __kfree_skb+0x3f/0xa0 [<ffffffff815680be>] SyS_sendto+0xe/0x10 [<ffffffff816434b2>] system_call_fastpath+0x16/0x1b The call chain leading to this as follow: call_add -> list_set_uadt -> list_set_uadd -> kzalloc(, GFP_KERNEL). And since GFP_KERNEL allows initiating direct reclaim thus potentially sleeping in the allocation path, this leads to the aforementioned splat. To fix it change that particular allocation type to GFP_ATOMIC, to correctly reflect that it is happening in an atomic context. Signed-off-by: Nikolay Borisov <kernel@xxxxxxxx> --- Even though this patch has been generated against the stand-alone ipset sources I just checked the 4.3-rc4 sources and the problem exists there as well. kernel/net/netfilter/ipset/ip_set_list_set.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/net/netfilter/ipset/ip_set_list_set.c b/kernel/net/netfilter/ipset/ip_set_list_set.c index b11ba96..0f9195f 100644 --- a/kernel/net/netfilter/ipset/ip_set_list_set.c +++ b/kernel/net/netfilter/ipset/ip_set_list_set.c @@ -298,7 +298,7 @@ list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext, ip_set_timeout_expired(ext_timeout(n, set)))) n = NULL; - e = kzalloc(set->dsize, GFP_KERNEL); + e = kzalloc(set->dsize, GFP_ATOMIC); if (!e) return -ENOMEM; e->id = d->id; -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
