| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Mon, 13 Mar 2023 05:30:36 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: mingkun bian <bianmingkun@...il.com>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>, kerneljasonxing@...il.com,
netdev@...r.kernel.org
Subject: Re: [ISSUE]soft lockup in __inet_lookup_established() function which
one sock exist in two hash buckets(tcp_hashinfo.ehash)
On Fri, Mar 10, 2023 at 10:46 PM mingkun bian <bianmingkun@...il.com> wrote:
>
> Hi,
>
> I am sorry that a newer kernel is not available to us for a period
> of time for other reasons, this issue is still found in 4.19 of arm,
> maybe this issue has nothing to do with kernel version, please tell me
> if you find any patch about this issue.
>
The 'maybe' question needs to be answered by you...
4.19 is too vague.
Also you mention arm, but your crash output refers to x86_64.
What exact kernel version have you tried ?
> Thanks.
>
> On Sat, 11 Mar 2023 at 05:38, Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
> >
> > From: mingkun bian <bianmingkun@...il.com>
> > Date: Fri, 10 Mar 2023 22:51:31 +0800
> > > Hi,
> > >
> > > I am sorry to submit the same post, because the format of the
> > > previous post is wrong.
> > >
> > > I have encountered the same issue which causes loop in
> > > __inet_lookup_established for 22 seconds, then kernel crash,
> > > similarly, we have thousands of devices with heavy network traffic,
> > > but only a few of them crash every day due to this reason.
> > >
> > > https://lore.kernel.org/lkml/CAL+tcoDAY=Q5pohEPgkBTNghxTb0AhmbQD58dPDghyxmrcWMRQ@mail.gmail.com/T/#mb7b613de68d86c9a302ccf227292ac273cbe7f7c
> > >
> > > Kernel version is 4.18.0, I analyzed the vmcore and find the point
> >
> > Thanks for the report, but you should not use 4.18.0 at least, which
> > is no longer supported. Could you try reproducing it on the net-next
> > tree or another stable versions listed below ?
> >
> > https://www.kernel.org/category/releases.html
> >
> > Thanks,
> > Kuniyuki
> >
> >
> > > of infinite loop is that one sock1 pointers exist in two hash
> > > buckets(tcp_hashinfo.ehash),
> > >
> > > tcp_hashinfo.ehash is as following:
> > > buckets0:
> > > buckets1:->sock1*->0x31(sock1->sk_nulls_node.next = 0x31, which
> > > means that sock1* is the end of buckets1), sock1* should not be here
> > > at buckets1,the real vmcore also has only one sock* in buckets1.
> > > buckets2:
> > > buckets3:->sock1*->0x31, sock1* is in the correct position at buckets3
> > > buckets4:->sock2*
> > > ...
> > > buckets:N->sockn*
> > >
> > > then a skb(inet_ehashfn=0x1) came, it matched to buckets1, and the
> > > condition validation(sk->sk_hash != hash) failed, then entered
> > > condition validation(get_nulls_value(node) != slot) ,
> > > get_nulls_value(node) = 3
> > > slot = 1
> > > finally, go to begin, and infinite loop.
> > >
> > > begin:
> > > sk_nulls_for_each_rcu(sk, node, &head->chain) {
> > > if (sk->sk_hash != hash)
> > > continue;
> > > }
> > > ...
> > > if (get_nulls_value(node) != slot)
> > > goto begin;
> > >
> > > why does sock1 can exist in two hash buckets, are there some
> > > scenarios where the sock is not deleted from the tcp_hashinfo.ehash
> > > before sk_free?
> > >
> > >
> > > The detailed three vmcore information is as follow：
> > > vmcore1' info:
> > > 1. print the skb, skb is 0xffff94824975e000 which stored in stack.
> > >
> > > crash> p *(struct tcphdr *)(((struct
> > > sk_buff*)0xffff94824975e000)->head + ((struct
> > > sk_buff*)0xffff94824975e000)->transport_header)
> > > $4 = {
> > > source = 24125,
> > > dest = 47873,
> > > seq = 4005063716,
> > > ack_seq = 1814397867,
> > > res1 = 0,
> > > doff = 8,
> > > fin = 0,
> > > syn = 0,
> > > rst = 0,
> > > psh = 1,
> > > ack = 1,
> > > urg = 0,
> > > ece = 0,
> > > cwr = 0,
> > > window = 33036,
> > > check = 19975,
> > > urg_ptr = 0
> > > }
> > >
> > > 2. print the sock1, tcp is in TIME_WAIT,the detailed analysis process
> > > is as follows:
> > > a. R14 is 0xffffad2e0dc8a210, which is &hashinfo->ehash[slot].
> > >
> > > crash> p *((struct inet_ehash_bucket*)0xffffad2e0dc8a210)
> > > $14 = {
> > > chain = {
> > > first = 0xffff9483ba400f48
> > > }
> > > }
> > >
> > > b. sock* = 0xffff9483ba400f48 - offset(sock, sk_nulls_node) = 0xffff9483ba400ee0
> > >
> > > we can see sock->sk_nulls_node is:
> > > skc_nulls_node = {
> > > next = 0x4efbf,
> > > pprev = 0xffffad2e0dd2cef8
> > > }
> > >
> > > c. skb inet_ehashfn is 0x13242 which is in R15.
> > >
> > > sock->skc_node is 0x4efbf, then its real slot is 0x4efbf >> 1 = 0x277df
> > > then bukets[0x277df] is (0x277df - 0x13242) * 8 + 0xffffad2e0dc8a210 =
> > > 0xFFFFAD2E0DD2CEF8
> > >
> > > d. print bukets[0x277df], find 0xffff9483ba400f48 is the same as
> > > bukets[0x13242]
> > >
> > > crash> p *((struct inet_ehash_bucket*)0xFFFFAD2E0DD2CEF8)
> > > $32 = {
> > > chain = {
> > > first = 0xffff9483ba400f48
> > > }
> > > }
> > >
> > > crash> p *((struct inet_timewait_sock*)0xffff9483ba400ee0)
> > > $5 = {
> > > __tw_common = {
> > > {
> > > skc_addrpair = 1901830485687183552,
> > > {
> > > skc_daddr = 442804416,
> > > skc_rcv_saddr = 442804416
> > > }
> > > },
> > > {
> > > skc_hash = 2667739103,
> > > skc_u16hashes = {30687, 40706}
> > > },
> > > {
> > > skc_portpair = 3817294857,
> > > {
> > > skc_dport = 19465,
> > > skc_num = 58247
> > > }
> > > },
> > > skc_family = 2,
> > > skc_state = 6 '\006',
> > > skc_reuse = 0 '\000',
> > > skc_reuseport = 0 '\000',
> > > skc_ipv6only = 0 '\000',
> > > skc_net_refcnt = 0 '\000',
> > > skc_bound_dev_if = 0,
> > > {
> > > skc_bind_node = {
> > > next = 0x0,
> > > pprev = 0xffff9492a8950538
> > > },
> > > skc_portaddr_node = {
> > > next = 0x0,
> > > pprev = 0xffff9492a8950538
> > > }
> > > },
> > > skc_prot = 0xffffffff9b9a9840,
> > > skc_net = {
> > > net = 0xffffffff9b9951c0
> > > },
> > > skc_v6_daddr = {
> > > in6_u = {
> > > u6_addr8 =
> > > "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
> > > u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
> > > u6_addr32 = {0, 0, 0, 0}
> > > }
> > > },
> > > skc_v6_rcv_saddr = {
> > > in6_u = {
> > > u6_addr8 =
> > > "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
> > > u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
> > > u6_addr32 = {0, 0, 0, 0}
> > > }
> > > },
> > > skc_cookie = {
> > > counter = 0
> > > },
> > > {
> > > skc_flags = 18446744072025102208,
> > > skc_listener = 0xffffffff9b995780,
> > > skc_tw_dr = 0xffffffff9b995780
> > > },
> > > skc_dontcopy_begin = 0xffff9483ba400f48,
> > > {
> > > skc_node = {
> > > next = 0x4efbf,
> > > pprev = 0xffffad2e0dd2cef8
> > > },
> > > skc_nulls_node = {
> > > next = 0x4efbf,
> > > pprev = 0xffffad2e0dd2cef8
> > > }
> > > },
> > > skc_tx_queue_mapping = 0,
> > > skc_rx_queue_mapping = 0,
> > > {
> > > skc_incoming_cpu = -1680142171,
> > > skc_rcv_wnd = 2614825125,
> > > skc_tw_rcv_nxt = 2614825125
> > > },
> > > skc_refcnt = {
> > > refs = {
> > > counter = 3
> > > }
> > > },
> > > skc_dontcopy_end = 0xffff9483ba400f64,
> > > {
> > > skc_rxhash = 320497927,
> > > skc_window_clamp = 320497927,
> > > skc_tw_snd_nxt = 320497927
> > > }
> > > },
> > > tw_mark = 0,
> > > tw_substate = 6 '\006',
> > > tw_rcv_wscale = 10 '\n',
> > > tw_sport = 34787,
> > > tw_kill = 0,
> > > tw_transparent = 0,
> > > tw_flowlabel = 0,
> > > tw_pad = 0,
> > > tw_tos = 0,
> > > tw_timer = {
> > > entry = {
> > > next = 0xffff9483ba401d48,
> > > pprev = 0xffff9481680177f8
> > > },
> > > expires = 52552264960,
> > > function = 0xffffffff9ad67ba0,
> > > flags = 1339031587,
> > > rh_reserved1 = 0,
> > > rh_reserved2 = 0,
> > > rh_reserved3 = 0,
> > > rh_reserved4 = 0
> > > },
> > > tw_tb = 0xffff9492a8950500
> > > }
> > > 3.call stack
> > > [48256841.222682] panic+0xe8/0x25c
> > > [48256841.222766] ? secondary_startup_64+0xb6/0xc0
> > > [48256841.222853] watchdog_timer_fn+0x209/0x210
> > > [48256841.222939] ? watchdog+0x30/0x30
> > > [48256841.223027] __hrtimer_run_queues+0xe5/0x260
> > > [48256841.223117] hrtimer_interrupt+0x122/0x270
> > > [48256841.223209] ? sched_clock+0x5/0x10
> > > [48256841.223296] smp_apic_timer_interrupt+0x6a/0x140
> > > [48256841.223384] apic_timer_interrupt+0xf/0x20
> > > [48256841.223471] RIP: 0010:__inet_lookup_established+0xe9/0x170
> > > [48256841.223562] Code: f6 74 33 44 3b 62 a4 75 3d 48 3b 6a 98 75 37
> > > 8b 42 ac 85 c0 75 24 4c 3b 6a c8 75 2a 5b 5d 41 5c 41 5d 41 5e 48 89
> > > f8 41 5f c3 <48> d1 ea 49 39 d7 0f 85 5a ff ff ff 31 ff eb e2 39 44 24
> > > 38 74 d6
> > > [48256841.224242] RSP: 0018:ffff9497e0e83bf8 EFLAGS: 00000202
> > > ORIG_RAX: ffffffffffffff13
> > > [48256841.224904] RAX: ffffad2e0dbf1000 RBX: 0000000088993242 RCX:
> > > 0000000034d20a82
> > > [48256841.225576] RDX: 000000000004efbf RSI: 00000000527c6da0 RDI:
> > > 0000000000000000
> > > [48256841.226268] RBP: 1e31b4763470e11b R08: 0000000001bb5e3d R09:
> > > 00000000000001bb
> > > [48256841.226969] R10: 0000000000005429 R11: 0000000000000000 R12:
> > > 0000000001bb5e3d
> > > [48256841.227646] R13: ffffffff9b9951c0 R14: ffffad2e0dc8a210 R15:
> > > 0000000000013242
> > > [48256841.228330] ? apic_timer_interrupt+0xa/0x20
> > > [48256841.228714] ? __inet_lookup_established+0x3f/0x170
> > > [48256841.229097] tcp_v4_early_demux+0xb0/0x170
> > > [48256841.229487] ip_rcv_finish+0x17c/0x430
> > > [48256841.229865] ip_rcv+0x27c/0x380
> > > [48256841.230242] __netif_receive_skb_core+0x9e9/0xac0
> > > [48256841.230623] ? inet_gro_receive+0x21b/0x2d0
> > > [48256841.230999] ? recalibrate_cpu_khz+0x10/0x10
> > > [48256841.231378] netif_receive_skb_internal+0x42/0xf0
> > > [48256841.231777] napi_gro_receive+0xbf/0xe0
> > >
> > >
> > > vmcore2' info:
> > > 1. print the skb
> > > crash> p *(struct tcphdr *)(((struct
> > > sk_buff*)0xffff9d60c008b500)->head + ((struct
> > > sk_buff*)0xffff9d60c008b500)->transport_header)
> > > $28 = {
> > > source = 35911,
> > > dest = 20480,
> > > seq = 1534560442,
> > > ack_seq = 0,
> > > res1 = 0,
> > > doff = 10,
> > > fin = 0,
> > > syn = 1,
> > > rst = 0,
> > > psh = 0,
> > > ack = 0,
> > > urg = 0,
> > > ece = 0,
> > > cwr = 0,
> > > window = 65535,
> > > check = 56947,
> > > urg_ptr = 0
> > > }
> > > 2. print the sock1, tcp is in TIME_WAIT, but the sock is ipv4, I do
> > > not know why skc_v6_daddr and rh_reserved is not zero, maybe memory
> > > out of bounds?
> > > crash> p *((struct inet_timewait_sock*)0xFFFF9D6F1997D540)
> > > $29 = {
> > > __tw_common = {
> > > {
> > > skc_addrpair = 388621010873919680,
> > > {
> > > skc_daddr = 426027200,
> > > skc_rcv_saddr = 90482880
> > > }
> > > },
> > > {
> > > skc_hash = 884720419,
> > > skc_u16hashes = {49955, 13499}
> > > },
> > > {
> > > skc_portpair = 156018620,
> > > {
> > > skc_dport = 42940,
> > > skc_num = 2380
> > > }
> > > },
> > > skc_family = 2,
> > > skc_state = 6 '\006',
> > > skc_reuse = 1 '\001',
> > > skc_reuseport = 0 '\000',
> > > skc_ipv6only = 0 '\000',
> > > skc_net_refcnt = 0 '\000',
> > > skc_bound_dev_if = 0,
> > > {
> > > skc_bind_node = {
> > > next = 0xffff9d8993851448,
> > > pprev = 0xffff9d89c3510458
> > > },
> > > skc_portaddr_node = {
> > > next = 0xffff9d8993851448,
> > > pprev = 0xffff9d89c3510458
> > > }
> > > },
> > > skc_prot = 0xffffffff9c7a9840,
> > > skc_net = {
> > > net = 0xffffffff9c7951c0
> > > },
> > > skc_v6_daddr = {
> > > in6_u = {
> > > u6_addr8 = "$P\325\001\354M\213D\021p\323\337\n",
> > > u6_addr16 = {20516, 42222, 54662, 60417, 35661, 4420, 54128, 2783},
> > > u6_addr32 = {2767081508, 3959543174, 289704781, 182440816}
> > > }
> > > },
> > > skc_v6_rcv_saddr = {
> > > in6_u = {
> > > u6_addr8 = "˲\231ª\212*pzf\212\277\325\065",
> > > u6_addr16 = {45771, 49817, 35498, 28714, 26234, 49034, 13781, 34008},
> > > u6_addr32 = {3264852683, 1881836202, 3213518458, 2228762069}
> > > }
> > > },
> > > skc_cookie = {
> > > counter = 0
> > > },
> > > {
> > > skc_flags = 18446744072039782272,
> > > skc_listener = 0xffffffff9c795780,
> > > skc_tw_dr = 0xffffffff9c795780
> > > },
> > > skc_dontcopy_begin = 0xffff9d6f1997d5a8,
> > > {
> > > skc_node = {
> > > next = 0x78647,
> > > pprev = 0xffffb341cddea918
> > > },
> > > skc_nulls_node = {
> > > next = 0x78647,
> > > pprev = 0xffffb341cddea918
> > > }
> > > },
> > > skc_tx_queue_mapping = 51317,
> > > skc_rx_queue_mapping = 9071,
> > > {
> > > skc_incoming_cpu = -720721118,
> > > skc_rcv_wnd = 3574246178,
> > > skc_tw_rcv_nxt = 3574246178
> > > },
> > > skc_refcnt = {
> > > refs = {
> > > counter = 3
> > > }
> > > },
> > > skc_dontcopy_end = 0xffff9d6f1997d5c4,
> > > {
> > > skc_rxhash = 2663156681,
> > > skc_window_clamp = 2663156681,
> > > skc_tw_snd_nxt = 2663156681
> > > }
> > > },
> > > tw_mark = 0,
> > > tw_substate = 6 '\006',
> > > tw_rcv_wscale = 10 '\n',
> > > tw_sport = 19465,
> > > tw_kill = 0,
> > > tw_transparent = 0,
> > > tw_flowlabel = 201048,
> > > tw_pad = 1,
> > > tw_tos = 0,
> > > tw_timer = {
> > > entry = {
> > > next = 0xffff9d6f1997d4c8,
> > > pprev = 0xffff9d6f1997c6f8
> > > },
> > > expires = 52813074277,
> > > function = 0xffffffff9bb67ba0,
> > > flags = 1313865770,
> > > rh_reserved1 = 14775289730400096190,
> > > rh_reserved2 = 10703603942626563734,
> > > rh_reserved3 = 17306812468345150807,
> > > rh_reserved4 = 9531906593543422642
> > > },
> > > tw_tb = 0xffff9d897232a500
> > > }
> > >
> > > vmcore3' info:
> > > 1. print the skbcrash> p *(struct tcphdr *)(((struct
> > > sk_buff*)0xffffa039e93aaf00)->head + ((struct
> > > sk_buff*)0xffffa039e93aaf00)->transport_header)
> > > $6 = {
> > > source = 9269,
> > > dest = 47873,
> > > seq = 147768854,
> > > ack_seq = 1282978926,
> > > res1 = 0,
> > > doff = 5,
> > > fin = 0,
> > > syn = 0,
> > > rst = 0,
> > > psh = 0,
> > > ack = 1,
> > > urg = 0,
> > > ece = 0,
> > > cwr = 0,
> > > window = 47146,
> > > check = 55446,
> > > urg_ptr = 0
> > > }
> > > 2. print the sock1, tcp is in TIME_WAIT
> > > crash> p *((struct inet_timewait_sock*)0xFFFFA0444BAADBA0)
> > > $7 = {
> > > __tw_common = {
> > > {
> > > skc_addrpair = 2262118455826491584,
> > > {
> > > skc_daddr = 392472768,
> > > skc_rcv_saddr = 526690496
> > > }
> > > },
> > > {
> > > skc_hash = 382525308,
> > > skc_u16hashes = {57212, 5836}
> > > },
> > > {
> > > skc_portpair = 1169509385,
> > > {
> > > skc_dport = 19465,
> > > skc_num = 17845
> > > }
> > > },
> > > skc_family = 2,
> > > skc_state = 6 '\006',
> > > skc_reuse = 0 '\000',
> > > skc_reuseport = 0 '\000',
> > > skc_ipv6only = 0 '\000',
> > > skc_net_refcnt = 0 '\000',
> > > skc_bound_dev_if = 0,
> > > {
> > > skc_bind_node = {
> > > next = 0x0,
> > > pprev = 0xffffa0528fefba98
> > > },
> > > skc_portaddr_node = {
> > > next = 0x0,
> > > pprev = 0xffffa0528fefba98
> > > }
> > > },
> > > skc_prot = 0xffffffffa33a9840,
> > > skc_net = {
> > > net = 0xffffffffa33951c0
> > > },
> > > skc_v6_daddr = {
> > > in6_u = {
> > > u6_addr8 =
> > > "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
> > > u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
> > > u6_addr32 = {0, 0, 0, 0}
> > > }
> > > },
> > > skc_v6_rcv_saddr = {
> > > in6_u = {
> > > u6_addr8 =
> > > "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
> > > u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
> > > u6_addr32 = {0, 0, 0, 0}
> > > }
> > > },
> > > skc_cookie = {
> > > counter = 20818915981
> > > },
> > > {
> > > skc_flags = 18446744072153028480,
> > > skc_listener = 0xffffffffa3395780,
> > > skc_tw_dr = 0xffffffffa3395780
> > > },
> > > skc_dontcopy_begin = 0xffffa0444baadc08,
> > > {
> > > skc_node = {
> > > next = 0x9bef9,
> > > pprev = 0xffffb36fcde60be0
> > > },
> > > skc_nulls_node = {
> > > next = 0x9bef9,
> > > pprev = 0xffffb36fcde60be0
> > > }
> > > },
> > > skc_tx_queue_mapping = 0,
> > > skc_rx_queue_mapping = 0,
> > > {
> > > skc_incoming_cpu = -2041214926,
> > > skc_rcv_wnd = 2253752370,
> > > skc_tw_rcv_nxt = 2253752370
> > > },
> > > skc_refcnt = {
> > > refs = {
> > > counter = 3
> > > }
> > > },
> > > skc_dontcopy_end = 0xffffa0444baadc24,
> > > {
> > > skc_rxhash = 653578381,
> > > skc_window_clamp = 653578381,
> > > skc_tw_snd_nxt = 653578381
> > > }
> > > },
> > > tw_mark = 0,
> > > tw_substate = 6 '\006',
> > > tw_rcv_wscale = 10 '\n',
> > > tw_sport = 46405,
> > > tw_kill = 0,
> > > tw_transparent = 0,
> > > tw_flowlabel = 0,
> > > tw_pad = 0,
> > > tw_tos = 0,
> > > tw_timer = {
> > > entry = {
> > > next = 0xffffa0444baac808,
> > > pprev = 0xffffa0388b5477f8
> > > },
> > > expires = 33384532933,
> > > function = 0xffffffffa2767ba0,
> > > flags = 1313865761,
> > > rh_reserved1 = 0,
> > > rh_reserved2 = 0,
> > > rh_reserved3 = 0,
> > > rh_reserved4 = 0
> > > },
> > > tw_tb = 0xffffa05cc8322d40
> > > }
Powered by blists - more mailing lists