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Florian Westphal
7defddefa9
In the initial ipset rhashtable conversion RFC series syzbot reported following splat: BUG: sleeping function [..] at kernel/irq_work.c:289 in_atomic(): 1, [..] irq_work_sync.. kernel/irq_work.c:289 rhashtable_free_and_destroy.. lib/rhashtable.c:1295 hash_netport4_destroy.. net/netfilter/ipset/ip_set_hash_gen.h:420 ip_set_destroy_set_rcu.. net/netfilter/ipset/ip_set_core.c:1169 rcu_core.. kernel/rcu/tree.c:2897 This is because post-rhashtable-conversion hash implementation needs to schedule in the destroy callback. At this time this isn't allowed. Replace existing call_rcu() based destruction with rcu_work api. Also allows to undo split of set destruction and gc work cancelling in a future patch. Signed-off-by: Florian Westphal <[email protected]> Signed-off-by: Pablo Neira Ayuso <[email protected]>