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Date: Tue, 28 Nov 2023 23:12:05 +0100
From: Antony Antony <antony@...nome.org>
To: Christian Hopps <chopps@...pps.org>
Cc: devel@...ux-ipsec.org, netdev@...r.kernel.org,
Christian Hopps <chopps@...n.net>
Subject: Re: [devel-ipsec] [RFC ipsec-next v2 0/8] Add IP-TFS mode to xfrm
Hi Chris,
I got a crash when running inside a namespace using veth. I got twice. It
is not 100% reproducable.
Note: I have KASAN enabled.
[ 226.323824] BUG: KASAN: null-ptr-deref in
iptfs_output_collect+0x1f5/0x61a
[ 226.325155] Read of size 8 at addr 0000000000000478 by task ping/5276
[ 226.325980]
[ 226.326220] CPU: 2 PID: 5276 Comm: ping Not tainted 6.6.0-rc1-00528-gadd9146753b7 #95
[ 226.327219] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 226.328396] Call Trace:
[ 226.328791] <TASK>
[ 226.329099] dump_stack_lvl+0x33/0x42
[ 226.329597] kasan_report+0xa0/0xc3
[ 226.330074] ? iptfs_output_collect+0x1f5/0x61a
[ 226.330678] iptfs_output_collect+0x1f5/0x61a
[ 226.331259] ip_send_skb+0x25/0x58
[ 226.331724] raw_sendmsg+0xec4/0xfee
[ 226.332223] ? raw_hash_sk+0x224/0x224
[ 226.332741] ? kasan_unpoison+0x44/0x52
[ 226.333258] ? kernel_init_pages+0x42/0x51
[ 226.333810] ? post_alloc_hook+0xba/0xe0
[ 226.334339] ? prep_new_page+0x44/0x51
[ 226.334849] ? ma_data_end+0x6e/0x88
[ 226.335338] ? preempt_count_sub+0x14/0xb5
[ 226.335894] ? zone_watermark_fast.isra.0+0x12b/0x12b
[ 226.336577] ? __might_resched+0x8d/0x248
[ 226.337116] ? __might_sleep+0x27/0xa2
[ 226.337626] ? first_zones_zonelist+0x2c/0x43
[ 226.338211] ? do_raw_spin_lock+0x72/0xbb
[ 226.338752] ? __might_resched+0x8d/0x248
[ 226.339291] ? __might_sleep+0x27/0xa2
[ 226.339801] ? inet_send_prepare+0x59/0x59
[ 226.340356] ? sock_sendmsg_nosec+0x42/0x6c
[ 226.340924] sock_sendmsg_nosec+0x42/0x6c
[ 226.341465] __sys_sendto+0x172/0x1e1
[ 226.341964] ? __x64_sys_getpeername+0x44/0x44
[ 226.342558] ? folio_batch_add_and_move+0x6a/0x7d
[ 226.343189] ? find_vma+0x6b/0x8b
[ 226.343646] ? find_vma_intersection+0x8a/0x8a
[ 226.344246] ? handle_mm_fault+0xfa/0x163
[ 226.344788] ? preempt_latency_start+0x41/0x4c
[ 226.345385] ? preempt_count_sub+0x14/0xb5
[ 226.345937] __x64_sys_sendto+0x76/0x82
[ 226.346456] do_syscall_64+0x58/0x78
[ 226.346946] entry_SYSCALL_64_after_hwframe+0x46/0xb0
[ 226.347611] RIP: 0033:0x7f378b00ba73
[ 226.348095] Code: 8b 15 a9 83 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 80 3d 71 0b 0d 00 00 41 89 ca 74 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 75 c3 0f 1f 40 00 55 48 83 ec 30 44 89 4c 24
[ 226.350433] RSP: 002b:00007fff58f9c148 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[ 226.351400] RAX: ffffffffffffffda RBX: 00005591b05fa340 RCX: 00007f378b00ba73
[ 226.352318] RDX: 0000000000000040 RSI: 00005591b06003c0 RDI: 0000000000000003
[ 226.353233] RBP: 00005591b06003c0 R08: 00005591b05fc5c0 R09: 0000000000000010
[ 226.354147] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040
[ 226.355061] R13: 00007fff58f9d830 R14: 0000001d00000001 R15: 00005591b05fd680
[ 226.355978] </TASK>
[ 226.356301] ==================================================================
[ 226.357274] Disabling lock debugging due to kernel taint
[ 226.357973] BUG: kernel NULL pointer dereference, address: 0000000000000478
[ 226.358865] #PF: supervisor read access in kernel mode
[ 226.359540] #PF: error_code(0x0000) - not-present page
[ 226.360220] PGD 0 P4D 0
[ 226.360594] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
[ 226.361346] CPU: 2 PID: 5276 Comm: ping Tainted: G B 6.6.0-rc1-00528-gadd9146753b7 #95
[ 226.362520] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 226.363693] RIP: 0010:iptfs_output_collect+0x1f5/0x61a
[ 226.364376] Code: c1 ff ff 65 ff 0d 12 29 35 7e 75 05 e8 c3 f0 31 ff 48 8d 7b 10 e8 4b 16 6b ff 4c 8b 73 10 49 8d be 78 04 00 00 e8 3b 16 6b ff <4d> 8b b6 78 04 00 00 49 8d be c0 01 00 00 e8 28 16 6b ff 49 8b 86
[ 226.366704] RSP: 0018:ffffc9000a357998 EFLAGS: 00010296
[ 226.367389] RAX: 0000000000000001 RBX: ffff8881123a7a00 RCX: fffffbfff075e9f5
[ 226.368308] RDX: fffffbfff075e9f5 RSI: fffffbfff075e9f5 RDI: ffffffff83af4fa0
[ 226.369237] RBP: ffff88810f45ac00 R08: 0000000000000008 R09: 0000000000000001
[ 226.370154] R10: ffffffff83af4fa7 R11: fffffbfff075e9f4 R12: 0000000000000000
[ 226.371070] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888114cbeb01
[ 226.371984] FS: 00007f378ad4fc40(0000) GS:ffff88815ad00000(0000) knlGS:0000000000000000
[ 226.373029] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 226.373777] CR2: 0000000000000478 CR3: 00000001083e9000 CR4: 0000000000350ee0
[ 226.374693] Call Trace:
[ 226.375042] <TASK>
[ 226.375352] ? __die_body+0x1a/0x58
[ 226.375828] ? page_fault_oops+0x459/0x4c7
[ 226.376387] ? irq_work_queue+0x2c/0x41
[ 226.376915] ? dump_pagetable+0x1db/0x1db
[ 226.377453] ? vprintk_emit+0x187/0x195
[ 226.377972] ? iptfs_output_collect+0x1f5/0x61a
[ 226.378576] ? _printk+0xb2/0xe1
[ 226.379021] ? syslog_print+0x340/0x340
[ 226.379541] ? do_user_addr_fault+0x156/0x59f
[ 226.380713] ? exc_page_fault+0xaa/0xc3
[ 226.381234] ? asm_exc_page_fault+0x22/0x30
[ 226.381795] ? iptfs_output_collect+0x1f5/0x61a
[ 226.382399] ? iptfs_output_collect+0x1f5/0x61a
[ 226.383002] ip_send_skb+0x25/0x58
[ 226.383469] raw_sendmsg+0xec4/0xfee
[ 226.383958] ? raw_hash_sk+0x224/0x224
[ 226.385083] ? kasan_unpoison+0x44/0x52
[ 226.385866] ? kernel_init_pages+0x42/0x51
[ 226.386687] ? post_alloc_hook+0xba/0xe0
[ 226.387559] ? prep_new_page+0x44/0x51
[ 226.388522] ? ma_data_end+0x6e/0x88
[ 226.389365] ? preempt_count_sub+0x14/0xb5
[ 226.390575] ? zone_watermark_fast.isra.0+0x12b/0x12b
[ 226.391555] ? __might_resched+0x8d/0x248
[ 226.392127] ? __might_sleep+0x27/0xa2
[ 226.392794] ? first_zones_zonelist+0x2c/0x43
[ 226.393684] ? do_raw_spin_lock+0x72/0xbb
[ 226.394501] ? __might_resched+0x8d/0x248
[ 226.395324] ? __might_sleep+0x27/0xa2
[ 226.396204] ? inet_send_prepare+0x59/0x59
[ 226.397042] ? sock_sendmsg_nosec+0x42/0x6c
[ 226.397879] sock_sendmsg_nosec+0x42/0x6c
[ 226.398704] __sys_sendto+0x172/0x1e1
[ 226.399465] ? __x64_sys_getpeername+0x44/0x44
[ 226.400367] ? folio_batch_add_and_move+0x6a/0x7d
[ 226.401327] ? find_vma+0x6b/0x8b
[ 226.401812] ? find_vma_intersection+0x8a/0x8a
[ 226.402442] ? handle_mm_fault+0xfa/0x163
[ 226.403014] ? preempt_latency_start+0x41/0x4c
[ 226.403641] ? preempt_count_sub+0x14/0xb5
[ 226.404224] __x64_sys_sendto+0x76/0x82
[ 226.404790] do_syscall_64+0x58/0x78
[ 226.405306] entry_SYSCALL_64_after_hwframe+0x46/0xb0
[ 226.406010] RIP: 0033:0x7f378b00ba73
[ 226.406524] Code: 8b 15 a9 83 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 80 3d 71 0b 0d 00 00 41 89 ca 74 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 75 c3 0f 1f 40 00 55 48 83 ec 30 44 89 4c 24
[ 226.408990] RSP: 002b:00007fff58f9c148 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[ 226.410020] RAX: ffffffffffffffda RBX: 00005591b05fa340 RCX: 00007f378b00ba73
[ 226.410992] RDX: 0000000000000040 RSI: 00005591b06003c0 RDI: 0000000000000003
[ 226.411968] RBP: 00005591b06003c0 R08: 00005591b05fc5c0 R09: 0000000000000010
[ 226.412948] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040
[ 226.413923] R13: 00007fff58f9d830 R14: 0000001d00000001 R15: 00005591b05fd680
[ 226.414904] </TASK>
[ 226.415243] Modules linked in:
[ 226.415697] CR2: 0000000000000478
[ 226.416181] ---[ end trace 0000000000000000 ]---
[ 226.416848] RIP: 0010:iptfs_output_collect+0x1f5/0x61a
[ 226.417569] Code: c1 ff ff 65 ff 0d 12 29 35 7e 75 05 e8 c3 f0 31 ff 48 8d 7b 10 e8 4b 16 6b ff 4c 8b 73 10 49 8d be 78 04 00 00 e8 3b 16 6b ff <4d> 8b b6 78 04 00 00 49 8d be c0 01 00 00 e8 28 16 6b ff 49 8b 86
[ 226.420031] RSP: 0018:ffffc9000a357998 EFLAGS: 00010296
[ 226.420764] RAX: 0000000000000001 RBX: ffff8881123a7a00 RCX: fffffbfff075e9f5
[ 226.421733] RDX: fffffbfff075e9f5 RSI: fffffbfff075e9f5 RDI: ffffffff83af4fa0
[ 226.422704] RBP: ffff88810f45ac00 R08: 0000000000000008 R09: 0000000000000001
[ 226.423671] R10: ffffffff83af4fa7 R11: fffffbfff075e9f4 R12: 0000000000000000
[ 226.424646] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888114cbeb01
[ 226.425616] FS: 00007f378ad4fc40(0000) GS:ffff88815ad00000(0000) knlGS:0000000000000000
[ 226.426709] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 226.427501] CR2: 0000000000000478 CR3: 00000001083e9000 CR4: 0000000000350ee0
[ 226.428492] Kernel panic - not syncing: Fatal exception in interrupt
[ 226.429587] Kernel Offset: disabled
[ 226.430096] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
(gdb) list *iptfs_output_collect+0x1f5
0xffffffff81ce40d6 is in iptfs_output_collect (./include/net/net_namespace.h:385).
380 }
381
382 static inline struct net *read_pnet(const possible_net_t *pnet)
383 {
384 #ifdef CONFIG_NET_NS
385 return pnet->net;
386 #else
387 return &init_net;
388 #endif
389 }
On Sun, Nov 12, 2023 at 10:52:11PM -0500, Christian Hopps via Devel wrote:
> From: Christian Hopps <chopps@...n.net>
>
> This patchset adds a new xfrm mode implementing on-demand IP-TFS. IP-TFS
> (AggFrag encapsulation) has been standardized in RFC9347.
>
> Link: https://www.rfc-editor.org/rfc/rfc9347.txt
>
> This feature supports demand driven (i.e., non-constant send rate) IP-TFS to
> take advantage of the AGGFRAG ESP payload encapsulation. This payload type
> supports aggregation and fragmentation of the inner IP packet stream which in
> turn yields higher small-packet bandwidth as well as reducing MTU/PMTU issues.
> Congestion control is unimplementated as the send rate is demand driven rather
> than constant.
>
> In order to allow loading this fucntionality as a module a set of callbacks
> xfrm_mode_cbs has been added to xfrm as well.
> --
> Devel mailing list
> Devel@...ux-ipsec.org
> https://linux-ipsec.org/mailman/listinfo/devel
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