netdev - Re: [PATCH v2] rhashtable: add restart routine in rhashtable_free_and

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Date:   Mon, 9 Jul 2018 00:11:35 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Taehee Yoo <ap420073@...il.com>
Cc:     davem@...emloft.net, tgraf@...g.ch, netdev@...r.kernel.org,
        fw@...len.de, pablo@...filter.org
Subject: Re: [PATCH v2] rhashtable: add restart routine in
 rhashtable_free_and_destroy()

On Sun, Jul 08, 2018 at 11:55:51AM +0900, Taehee Yoo wrote:
> rhashtable_free_and_destroy() cancels re-hash deferred work
> then walks and destroys elements. at this moment, some elements can be
> still in future_tbl. that elements are not destroyed.
> 
> test case:
> nft_rhash_destroy() calls rhashtable_free_and_destroy() to destroy
> all elements of sets before destroying sets and chains.
> But rhashtable_free_and_destroy() doesn't destroy elements of future_tbl.
> so that splat occurred.
> 
> test script:
>    %cat test.nft
>    table ip aa {
> 	   map map1 {
> 		   type ipv4_addr : verdict;
> 		   elements = {
> 			   0 : jump a0,
> 			   1 : jump a0,
> 			   2 : jump a0,
> 			   3 : jump a0,
> 			   4 : jump a0,
> 			   5 : jump a0,
> 			   6 : jump a0,
> 			   7 : jump a0,
> 			   8 : jump a0,
> 			   9 : jump a0,
> 		}
> 	   }
> 	   chain a0 {
> 	   }
>    }
>    flush ruleset
>    table ip aa {
> 	   map map1 {
> 		   type ipv4_addr : verdict;
> 		   elements = {
> 			   0 : jump a0,
> 			   1 : jump a0,
> 			   2 : jump a0,
> 			   3 : jump a0,
> 			   4 : jump a0,
> 			   5 : jump a0,
> 			   6 : jump a0,
> 			   7 : jump a0,
> 			   8 : jump a0,
> 			   9 : jump a0,
> 		   }
> 	   }
> 	   chain a0 {
> 	   }
>    }
>    flush ruleset
> 
>    %while :; do nft -f test.nft; done
> 
> Splat looks like:
> [  200.795603] kernel BUG at net/netfilter/nf_tables_api.c:1363!
> [  200.806944] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
> [  200.812253] CPU: 1 PID: 1582 Comm: nft Not tainted 4.17.0+ #24
> [  200.820297] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/08/2015
> [  200.830309] RIP: 0010:nf_tables_chain_destroy.isra.34+0x62/0x240 [nf_tables]
> [  200.838317] Code: 43 50 85 c0 74 26 48 8b 45 00 48 8b 4d 08 ba 54 05 00 00 48 c7 c6 60 6d 29 c0 48 c7 c7 c0 65 29 c0 4c 8b 40 08 e8 58 e5 fd f8 <0f> 0b 48 89 da 48 b8 00 00 00 00 00 fc ff
> [  200.860366] RSP: 0000:ffff880118dbf4d0 EFLAGS: 00010282
> [  200.866354] RAX: 0000000000000061 RBX: ffff88010cdeaf08 RCX: 0000000000000000
> [  200.874355] RDX: 0000000000000061 RSI: 0000000000000008 RDI: ffffed00231b7e90
> [  200.882361] RBP: ffff880118dbf4e8 R08: ffffed002373bcfb R09: ffffed002373bcfa
> [  200.890354] R10: 0000000000000000 R11: ffffed002373bcfb R12: dead000000000200
> [  200.898356] R13: dead000000000100 R14: ffffffffbb62af38 R15: dffffc0000000000
> [  200.906354] FS:  00007fefc31fd700(0000) GS:ffff88011b800000(0000) knlGS:0000000000000000
> [  200.915533] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  200.922355] CR2: 0000557f1c8e9128 CR3: 0000000106880000 CR4: 00000000001006e0
> [  200.930353] Call Trace:
> [  200.932351]  ? nf_tables_commit+0x26f6/0x2c60 [nf_tables]
> [  200.939525]  ? nf_tables_setelem_notify.constprop.49+0x1a0/0x1a0 [nf_tables]
> [  200.947525]  ? nf_tables_delchain+0x6e0/0x6e0 [nf_tables]
> [  200.952383]  ? nft_add_set_elem+0x1700/0x1700 [nf_tables]
> [  200.959532]  ? nla_parse+0xab/0x230
> [  200.963529]  ? nfnetlink_rcv_batch+0xd06/0x10d0 [nfnetlink]
> [  200.968384]  ? nfnetlink_net_init+0x130/0x130 [nfnetlink]
> [  200.975525]  ? debug_show_all_locks+0x290/0x290
> [  200.980363]  ? debug_show_all_locks+0x290/0x290
> [  200.986356]  ? sched_clock_cpu+0x132/0x170
> [  200.990352]  ? find_held_lock+0x39/0x1b0
> [  200.994355]  ? sched_clock_local+0x10d/0x130
> [  200.999531]  ? memset+0x1f/0x40
> 
> V2:
>  - free all tables requested by Herbert Xu
> 
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt