使用Crash工具查看一个TCP listen sock内存布局实例

利用crash工具，我们可以很方便的查看正在运行内核的一些全局变量的数据结构，如TCP的ehash、bhash哈希桶，全局变量的查看比较简单。Crash工具还允许我们查看调用堆栈内部的局部变量，下面示例查看一个进程的listen sock结构（实际上从file->private_data中查看更为方便）

******@Inspiron:~$nc -lk 45678
#接着在另一个终端上运行下面命令
root@Inspiron:/home/******$ps -aux | grep 45678
******
5184 0.0 0.0 9184 816 pts/23 S+ 23:20 0:00 nc -lk 45678
root 5187 0.0 0.0 15984 944 pts/20 S+ 23:20 0:00 grep --color=auto 45678
root@Inspiron:/home/******$crash
crash 7.1.4
Copyright(C)2002-2015 RedHat,Inc.
Copyright(C)2004,2005,2006,2010 IBM Corporation
Copyright(C)1999-2006 Hewlett-PackardCo
Copyright(C)2005,2006,2011,2012 FujitsuLimited
Copyright(C)2006,2007 VA LinuxSystemsJapan K.K.
Copyright(C)2005,2011 NEC Corporation
Copyright(C)1999,2002,2007 SiliconGraphics,Inc.
Copyright(C)1999,2000,2001,2002 MissionCriticalLinux,Inc.
This program is free software, covered by the GNU GeneralPublicLicense,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter"help copying" to see the conditions.
This program has absolutely no warranty. Enter"help warranty"for details.
GNU gdb (GDB)7.6
Copyright(C)2013FreeSoftwareFoundation,Inc.
LicenseGPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type"show copying"
and "show warranty"for details.
This GDB was configured as "x86_64-unknown-linux-gnu"...
crash: read error: kernel virtual address: ffffffff81a11e30 type:"cpu_possible_mask"
crash: this kernel may be configured with CONFIG_STRICT_DEVMEM, which
renders /dev/mem unusable as a live memory source.
crash: trying /proc/kcore as an alternative to /dev/mem
KERNEL:/lib/modules/4.4.13+/build/vmlinux
DUMPFILE:/proc/kcore
CPUS:4
DATE:MonNov 723:20:532016
UPTIME:02:28:15
LOAD AVERAGE:1.10,0.86,0.77
TASKS:663
NODENAME: ******-Inspiron-N5010
RELEASE:4.4.13+
VERSION:#5 SMP Sat Nov 5 15:51:12 CST 2016
MACHINE: x86_64 (2526Mhz)
MEMORY:3.9 GB
PID:5191
COMMAND:"crash"
TASK: ffff88006fc80000 [THREAD_INFO: ffff8800672bc000]
CPU:1
STATE: TASK_RUNNING (ACTIVE)
crash>set pid 5184
set: invalid task or pid value: pid
PID:5184
COMMAND:"nc"
TASK: ffff880035687080 [THREAD_INFO: ffff88006ca34000]
CPU:2
STATE: TASK_INTERRUPTIBLE
crash> bt
PID:5184 TASK: ffff880035687080 CPU:2 COMMAND:"nc"
#0 [ffff88006ca37ca0] __schedule at ffffffff81825b8e
#1 [ffff88006ca37cf0] schedule at ffffffff81826275
#2 [ffff88006ca37d08] schedule_timeout at ffffffff81829395
#3 [ffff88006ca37db8] inet_csk_accept at ffffffff81766b8b
#4 [ffff88006ca37e30] inet_accept at ffffffff8179897c
#5 [ffff88006ca37e68] SYSC_accept4 at ffffffff816fe523
#6 [ffff88006ca37f40] sys_accept at ffffffff81700110
#7 [ffff88006ca37f50] entry_SYSCALL_64_fastpath at ffffffff8182a372
RIP:00007fb0c2b504b0 RSP:00007ffd3bde40c8 RFLAGS:00000246
RAX: ffffffffffffffda RBX:0000000001978010 RCX:00007fb0c2b504b0
RDX:00007ffd3bde4154 RSI:00007ffd3bde41e0 RDI:0000000000000003
RBP:0000000000000000 R8:0000000000000000 R9:0000000000000000
R10:000000000000071a R11:0000000000000246 R12:0000000000000005
R13:0000000000405a21 R14:0000000000000000 R15:0000000000000000
ORIG_RAX:000000000000002b CS:0033 SS:002b
crash> bt -f
PID:5184 TASK: ffff880035687080 CPU:2 COMMAND:"nc"
#0 [ffff88006ca37ca0] __schedule at ffffffff81825b8e
ffff88006ca37ca8: ffffffff811e9d79 ffff880132818c80
ffff88006ca37cb8: ffff880035687080 ffff88006ca38000
ffff88006ca37cc8: ffff88006ca37e3c 7fffffffffffffff
ffff88006ca37cd8: ffff880035687080 ffff880106ad8780
ffff88006ca37ce8: ffff88006ca37d00 ffffffff81826275
#1 [ffff88006ca37cf0] schedule at ffffffff81826275
ffff88006ca37cf8:7fffffffffffffff ffff88006ca37db0
ffff88006ca37d08: ffffffff81829395
#2 [ffff88006ca37d08] schedule_timeout at ffffffff81829395
ffff88006ca37d10:7fffffffffffffff ffffffff81d6021d
ffff88006ca37d20:00000000000000000000000000000000
ffff88006ca37d30:00000000000000000000000000000000
ffff88006ca37d40:00000000000000000000000600000001
ffff88006ca37d50:00000000000000000000000000000246
ffff88006ca37d60:7fffffffffffffff ffff88006ca37d78
ffff88006ca37d70: ffffffff81829eae 0000000028c4ff93
ffff88006ca37d80: ffffffff817033ad 7fffffffffffffff
ffff88006ca37d90: ffff88006ca37e3c 7fffffffffffffff
ffff88006ca37da0: ffff880035687080 ffff880106ad8780
ffff88006ca37db0: ffff88006ca37e28 ffffffff81766b8b
#3 [ffff88006ca37db8] inet_csk_accept at ffffffff81766b8b
ffff88006ca37dc0: ffff880035687080 ffff880035687080
ffff88006ca37dd0:0000000000000001 ffff880035687080
ffff88006ca37de0: ffffffff810c2a80 ffff88006c990908
ffff88006ca37df0: ffff88006c990908 0000000028c4ff93
ffff88006ca37e00: ffff88009a505b80 ffff88009a505400
ffff88006ca37e10:000000000000000400007ffd3bde41e0
ffff88006ca37e20: ffff88009a505400 ffff88006ca37e60
#从inet_csk_accept反汇编代码中可以确定listen sock存储与R15寄存器，在函数调用过程中，R15寄存器存于调用堆栈中，如下代码push %r15
crash> dis -l schedule_timeout
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1494
0xffffffff818291e0<schedule_timeout>: data32 data32 data32 xchg %ax,%ax [FTRACE NOP]
0xffffffff818291e5<schedule_timeout+5>: push %rbp
0xffffffff818291e6<schedule_timeout+6>: mov %rsp,%rbp
0xffffffff818291e9<schedule_timeout+9>: push %r15
0xffffffff818291eb<schedule_timeout+11>: push %r14
0xffffffff818291ed<schedule_timeout+13>: push %r13
0xffffffff818291ef<schedule_timeout+15>: push %r12
0xffffffff818291f1<schedule_timeout+17>: push %rbx
0xffffffff818291f2<schedule_timeout+18>: and $0xfffffffffffffff0,%rsp
0xffffffff818291f6<schedule_timeout+22>: sub $0x70,%rsp
0xffffffff818291fa<schedule_timeout+26>: mov %gs:0x28,%rax
0xffffffff81829203<schedule_timeout+35>: mov %rax,0x68(%rsp)
0xffffffff81829208<schedule_timeout+40>: xor %eax,%eax
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1498
0xffffffff8182920a<schedule_timeout+42>: movabs $0x7fffffffffffffff,%rax
0xffffffff81829214<schedule_timeout+52>: cmp %rax,%rdi
0xffffffff81829217<schedule_timeout+55>: je 0xffffffff8182938c<schedule_timeout+428>
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1518
0xffffffff8182921d<schedule_timeout+61>: test %rdi,%rdi
0xffffffff81829220<schedule_timeout+64>: js 0xffffffff81829422<schedule_timeout+578>
/home/******/MyRes/linux-source-4.4.0/kernel/time/timer.c:1527
#从bt -f显示的调用堆栈中确定在运行inet_csk_accept函数的时候，R15寄存器的值为ffff880106ad8780，取出listen sock地址
crash> struct sock ffff880106ad8780
struct sock {
__sk_common ={
{
skc_addrpair =0,
{
skc_daddr =0,
skc_rcv_saddr =0
}
},
{
skc_hash =0,
skc_u16hashes ={0,0}
},
{
skc_portpair =2993553408,
{
skc_dport =0,
skc_num =45678
}
},
skc_family =2,
skc_state =10'\n',
skc_reuse =1'\001',
skc_reuseport =0'\000',
skc_ipv6only =0'\000',
skc_net_refcnt =1'\001',
debug =0'\000',
skc_bound_dev_if =0,
{
skc_bind_node ={
next =0x0,
pprev =0xffff88006c9909e8
},
skc_portaddr_node ={
next =0x0,
pprev =0xffff88006c9909e8
}
},
skc_prot =0xffffffff81efa160<tcp_prot>,
skc_net ={
net =0xffffffff81ef3e00<init_net>
},
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 =768,
skc_listener =0x300,
skc_tw_dr =0x300
},
skc_dontcopy_begin =0xffff880106ad87e8,
{
skc_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
},
skc_nulls_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
}
},
skc_tx_queue_mapping =-1,
{
skc_incoming_cpu =-1,
skc_rcv_wnd =4294967295,
skc_tw_rcv_nxt =4294967295
},
skc_refcnt ={
counter =1
},
skc_dontcopy_end =0xffff880106ad8804,
{
skc_rxhash =0,
skc_window_clamp =0,
skc_tw_snd_nxt =0
}
},
sk_lock ={
slock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
owned =0,
wq ={
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
task_list ={
next =0xffff880106ad8818,
prev =0xffff880106ad8818
}
}
},
sk_receive_queue ={
next =0xffff880106ad8828,
prev =0xffff880106ad8828,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_backlog ={
rmem_alloc ={
counter =0
},
len =0,
head =0x0,
tail =0x0
},
sk_forward_alloc =0,
sk_txhash =0,
sk_napi_id =0,
sk_ll_usec =0,
sk_drops ={
counter =0
},
sk_rcvbuf =87380,
sk_filter =0x0,
{
sk_wq =0xffff88006c990900,
sk_wq_raw =0xffff88006c990900
},
sk_policy ={0x0,0x0},
sk_rx_dst =0x0,
sk_dst_cache =0x0,
sk_wmem_alloc ={
counter =1
},
sk_omem_alloc ={
counter =0
},
sk_sndbuf =16384,
sk_write_queue ={
next =0xffff880106ad88b0,
prev =0xffff880106ad88b0,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_shutdown =0,
sk_no_check_tx =0,
sk_no_check_rx =0,
sk_userlocks =8,
sk_protocol =6,
sk_type =1,
sk_wmem_queued =0,
sk_allocation =37748928,
sk_pacing_rate =4294967295,
sk_max_pacing_rate =4294967295,
sk_route_caps =0,
sk_route_nocaps =0,
sk_gso_type =0,
sk_gso_max_size =0,
sk_gso_max_segs =0,
sk_rcvlowat =1,
sk_lingertime =0,
sk_error_queue ={
next =0xffff880106ad8908,
prev =0xffff880106ad8908,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_prot_creator =0xffffffff81efa160<tcp_prot>,
sk_callback_lock ={
raw_lock ={
cnts ={
counter =0
},
wait_lock ={
val ={
counter =0
}
}
}
},
sk_err =0,
sk_err_soft =0,
sk_ack_backlog =0,
sk_max_ack_backlog =1,
sk_priority =0,
sk_cgrp_prioidx =1,
sk_peer_pid =0x0,
sk_peer_cred =0x0,
sk_rcvtimeo =9223372036854775807,
sk_sndtimeo =9223372036854775807,
sk_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177d710<tcp_keepalive_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
},
sk_stamp ={
tv64 =-1000000000
},
sk_tsflags =0,
sk_tskey =0,
sk_socket =0xffff88009a505b80,
sk_user_data =0x0,
sk_frag ={
page =0x0,
offset =0,
size =0
},
sk_send_head =0x0,
sk_peek_off =-1,
sk_write_pending =0,
sk_security =0xffff88006caaf340,
sk_mark =0,
sk_classid =0,
sk_cgrp =0x0,
sk_state_change =0xffffffff81701ee0<sock_def_wakeup>,
sk_data_ready =0xffffffff81702930<sock_def_readable>,
sk_write_space =0xffffffff8170f670<sk_stream_write_space>,
sk_error_report =0xffffffff81702840<sock_def_error_report>,
sk_backlog_rcv =0xffffffff81781da0<tcp_v4_do_rcv>,
sk_destruct =0xffffffff817998f0<inet_sock_destruct>
}
crash> struct inet_connection_sock ffff880106ad8780
struct inet_connection_sock {
icsk_inet ={
sk ={
__sk_common ={
{
skc_addrpair =0,
{
skc_daddr =0,
skc_rcv_saddr =0
}
},
{
skc_hash =0,
skc_u16hashes ={0,0}
},
{
skc_portpair =2993553408,
{
skc_dport =0,
skc_num =45678
}
},
skc_family =2,
skc_state =10'\n',
skc_reuse =1'\001',
skc_reuseport =0'\000',
skc_ipv6only =0'\000',
skc_net_refcnt =1'\001',
debug =0'\000',
skc_bound_dev_if =0,
{
skc_bind_node ={
next =0x0,
pprev =0xffff88006c9909e8
},
skc_portaddr_node ={
next =0x0,
pprev =0xffff88006c9909e8
}
},
skc_prot =0xffffffff81efa160<tcp_prot>,
skc_net ={
net =0xffffffff81ef3e00<init_net>
},
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 =768,
skc_listener =0x300,
skc_tw_dr =0x300
},
skc_dontcopy_begin =0xffff880106ad87e8,
{
skc_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
},
skc_nulls_node ={
next =0x4000000d,
pprev =0xffffffff821f61a8<tcp_hashinfo+168>
}
},
skc_tx_queue_mapping =-1,
{
skc_incoming_cpu =-1,
skc_rcv_wnd =4294967295,
skc_tw_rcv_nxt =4294967295
},
skc_refcnt ={
counter =1
},
skc_dontcopy_end =0xffff880106ad8804,
{
skc_rxhash =0,
skc_window_clamp =0,
skc_tw_snd_nxt =0
}
},
sk_lock ={
slock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
owned =0,
wq ={
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
task_list ={
next =0xffff880106ad8818,
prev =0xffff880106ad8818
}
}
},
sk_receive_queue ={
next =0xffff880106ad8828,
prev =0xffff880106ad8828,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_backlog ={
rmem_alloc ={
counter =0
},
len =0,
head =0x0,
tail =0x0
},
sk_forward_alloc =0,
sk_txhash =0,
sk_napi_id =0,
sk_ll_usec =0,
sk_drops ={
counter =0
},
sk_rcvbuf =87380,
sk_filter =0x0,
{
sk_wq =0xffff88006c990900,
sk_wq_raw =0xffff88006c990900
},
sk_policy ={0x0,0x0},
sk_rx_dst =0x0,
sk_dst_cache =0x0,
sk_wmem_alloc ={
counter =1
},
sk_omem_alloc ={
counter =0
},
sk_sndbuf =16384,
sk_write_queue ={
next =0xffff880106ad88b0,
prev =0xffff880106ad88b0,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_shutdown =0,
sk_no_check_tx =0,
sk_no_check_rx =0,
sk_userlocks =8,
sk_protocol =6,
sk_type =1,
sk_wmem_queued =0,
sk_allocation =37748928,
sk_pacing_rate =4294967295,
sk_max_pacing_rate =4294967295,
sk_route_caps =0,
sk_route_nocaps =0,
sk_gso_type =0,
sk_gso_max_size =0,
sk_gso_max_segs =0,
sk_rcvlowat =1,
sk_lingertime =0,
sk_error_queue ={
next =0xffff880106ad8908,
prev =0xffff880106ad8908,
qlen =0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
}
},
sk_prot_creator =0xffffffff81efa160<tcp_prot>,
sk_callback_lock ={
raw_lock ={
cnts ={
counter =0
},
wait_lock ={
val ={
counter =0
}
}
}
},
sk_err =0,
sk_err_soft =0,
sk_ack_backlog =0,
sk_max_ack_backlog =1,
sk_priority =0,
sk_cgrp_prioidx =1,
sk_peer_pid =0x0,
sk_peer_cred =0x0,
sk_rcvtimeo =9223372036854775807,
sk_sndtimeo =9223372036854775807,
sk_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177d710<tcp_keepalive_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
},
sk_stamp ={
tv64 =-1000000000
},
sk_tsflags =0,
sk_tskey =0,
sk_socket =0xffff88009a505b80,
sk_user_data =0x0,
sk_frag ={
page =0x0,
offset =0,
size =0
},
sk_send_head =0x0,
sk_peek_off =-1,
sk_write_pending =0,
sk_security =0xffff88006caaf340,
sk_mark =0,
sk_classid =0,
sk_cgrp =0x0,
sk_state_change =0xffffffff81701ee0<sock_def_wakeup>,
sk_data_ready =0xffffffff81702930<sock_def_readable>,
sk_write_space =0xffffffff8170f670<sk_stream_write_space>,
sk_error_report =0xffffffff81702840<sock_def_error_report>,
sk_backlog_rcv =0xffffffff81781da0<tcp_v4_do_rcv>,
sk_destruct =0xffffffff817998f0<inet_sock_destruct>
},
pinet6 =0x0,
inet_saddr =0,
uc_ttl =-1,
cmsg_flags =0,
inet_sport =28338,
inet_id =0,
inet_opt =0x0,
rx_dst_ifindex =0,
tos =0'\000',
min_ttl =0'\000',
mc_ttl =1'\001',
pmtudisc =1'\001',
recverr =0'\000',
is_icsk =1'\001',
freebind =0'\000',
hdrincl =0'\000',
mc_loop =1'\001',
transparent =0'\000',
mc_all =1'\001',
nodefrag =0'\000',
bind_address_no_port =0'\000',
rcv_tos =0'\000',
convert_csum =0'\000',
uc_index =0,
mc_index =0,
mc_addr =0,
mc_list =0x0,
cork ={
base ={
flags =0,
addr =0,
opt =0x0,
fragsize =0,
length =0,
dst =0x0,
tx_flags =0'\000',
ttl =0'\000',
tos =0,
priority =0'\000'
},
fl ={
u ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'\000',
flowic_scope =0'\000',
flowic_proto =0'\000',
flowic_flags =0'\000',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
ip4 ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'\000',
flowic_scope =0'\000',
flowic_proto =0'\000',
flowic_flags =0'\000',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
saddr =0,
daddr =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'\000',
code =0'\000'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'\000'
}
}
},
ip6 ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'\000',
flowic_scope =0'\000',
flowic_proto =0'\000',
flowic_flags =0'\000',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
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}
}
},
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}
}
},
flowlabel =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'\000',
code =0'\000'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'\000'
}
}
},
dn ={
__fl_common ={
flowic_oif =0,
flowic_iif =0,
flowic_mark =0,
flowic_tos =0'\000',
flowic_scope =0'\000',
flowic_proto =0'\000',
flowic_flags =0'\000',
flowic_secid =0,
flowic_tun_key ={
tun_id =0
}
},
daddr =0,
saddr =0,
uli ={
ports ={
dport =0,
sport =0
},
icmpt ={
type =0'\000',
code =0'\000'
},
dnports ={
dport =0,
sport =0
},
spi =0,
gre_key =0,
mht ={
type =0'\000'
}
}
}
}
}
}
},
icsk_accept_queue ={
rskq_lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
rskq_defer_accept =0'\000',
synflood_warned =0,
qlen ={
counter =0
},
young ={
counter =0
},
rskq_accept_head =0x0,
rskq_accept_tail =0x0,
fastopenq ={
rskq_rst_head =0x0,
rskq_rst_tail =0x0,
lock ={
{
rlock ={
raw_lock ={
val ={
counter =0
}
}
}
}
},
qlen =0,
max_qlen =0
}
},
icsk_bind_hash =0xffff88006c9909c0,
icsk_timeout =0,
icsk_retransmit_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177e850<tcp_write_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
},
icsk_delack_timer ={
entry ={
next =0x0,
pprev =0x0
},
expires =0,
function=0xffffffff8177dd10<tcp_delack_timer>,
data =18446612136721221504,
flags =2,
slack =-1,
start_pid =-1,
start_site =0x0,
start_comm ="\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
},
icsk_rto =250,
icsk_pmtu_cookie =0,
icsk_ca_ops =0xffffffff81f3e2e0<cubictcp>,
icsk_af_ops =0xffffffff81ac1fc0<ipv4_specific>,
icsk_sync_mss =0xffffffff81778240<tcp_sync_mss>,
icsk_ca_state =0'\000',
icsk_ca_setsockopt =0'\000',
icsk_ca_dst_locked =0'\000',
icsk_retransmits =0'\000',
icsk_pending =0'\000',
icsk_backoff =0'\000',
icsk_syn_retries =0'\000',
icsk_probes_out =0'\000',
icsk_ext_hdr_len =0,
icsk_ack ={
pending =0'\000',
quick =0'\000',
pingpong =0'\000',
blocked =0'\000',
ato =0,
timeout =0,
lrcvtime =0,
last_seg_size =0,
rcv_mss =0
},
icsk_mtup ={
enabled =0,
search_high =0,
search_low =0,
probe_size =0,
probe_timestamp =0
},
icsk_user_timeout =0,
icsk_ca_priv ={0,0,0,0,0,0,0,0}
}
crash>
crash>
crash>
crash>
crash>

来自为知笔记(Wiz)

使用Crash工具查看一个TCP listen sock内存布局实例的更多相关文章

利用jmap和MAT等工具查看JVM运行时堆内存
jmap JDK自带了一些工具可以帮助我们查看JVM运行的堆内存情况,常用的是jmap命令 jmap -heap <pid> 打印堆的使用情况那么,从这个输出中我们也可以大致看出堆的结构 ...
windows下使用adb工具查看android程序cpu和内存消耗情况
在实际的开发当中,尤其软件运行在一个硬件设备比较差的环境下,对软件占用资源大的问题是开发者们必须要解决的问题,系统比较卡.觉得应该看看程序的cpu和内存消耗一直以来都在windows下编程,已经习惯 ...
一个Java对象的内存布局
1.对象的创建过程 class loading class linking(verification,preparation,resolution) class initializing 申请对象内存 ...
查看struct或class的内存布局
适用于VC编译器(Visual Studio) 附加选项: /d1 reportSingleClassLayout[foo] 例如CItem(注意后面没有空格) /d1 reportSingleCla ...
wireshark抓包工具简介以及tcp三次握手的一些含义
wireshark是非常流行的网络封包分析软件,功能十分强大.可以截取各种网络封包,显示网络封包的详细信息.使用wireshark的人必须了解网络协议,否则就看不懂wireshark了.为了安全考虑, ...
查看JVM运行时堆内存
利用jmap和MAT等工具查看JVM运行时堆内存 https://www.cnblogs.com/cjsblog/p/9561375.html jmap JDK自带了一些工具可以帮助我们查看JVM运行 ...
一个suse11 sp1的crash工具版本问题
这几年排查的各种类型的crash也比较多了,各种类型的也算见过,但是排查这个crash,走了不该走的弯路,事后显得很low,为了防止自己犯类似错误,也同时提醒后人,记录之. 内核是suse11,sp1 ...
使用Crash工具分析 Linux dump文件【转】
转自:https://blog.csdn.net/bytxl/article/details/45025183 前言 Linux 内核(以下简称内核)是一个不与特定进程相关的功能集合,内核的代码很难轻 ...
使用 Crash 工具分析 Linux dump 文件
转自:http://blog.csdn.net/commsea/article/details/11804897 简介: Linux 内核由于其复杂性,使得对内核出现的各种异常的追踪变得异常困难.本文 ...

随机推荐

WPF设置全局字体和字体嵌入
原文:WPF设置全局字体和字体嵌入版权声明:本文为博主原创文章,未经博主允许不得转载. https://blog.csdn.net/CLeopard/article/details/40590373 ...
pg_stat_statements源代码分析
磨砺技术珠矶,践行数据之道,追求卓越价值回到上一级页面:PostgreSQL内部结构与源代码研究索引页回到顶级页面:PostgreSQL索引页 pg_stat_statement的源代码,非 ...
16-[JavaScript]-ECMAScript 2
1.流程控制:if switch <!DOCTYPE html> <html> <head> <meta charset="UTF-8"& ...
jmeter汉化
测试需要许多工具辅助工作,我们在使用这些工具之前需要对工具有一定的了解,第一步就是需要安装特定的软件. 因为工具基本上都是英文版的,所以菜鸟使用就面临汉化的问题,下面介绍几种汉化的办法: 一.万事不决 ...
Myeclipse提高运行速度的方法
下文是在其他博客拷过来的,借鉴借鉴,留个笔记,哈哈 1.老是弹出Quick update error .关闭myeclipse的Quick Update自动更新功能这个问题的解决办法是关闭自动更新Wi ...
Catlike学习笔记(1.2)-使用Unity画函数图像
『Catlike系列教程』第二篇来了~今天周六,早上(上午11点)醒来去超市买了一周的零食回来以后就玩了一整天游戏非常有负罪感.现在晚上九点天还亮着感觉像下午7点左右的样子好像还不是很晚...所以就写 ...
基于Redis实现分布式锁（续）
代码实现: redis实现分布式锁(lock:通过间隔时间段去请求Redis,来实现阻塞占用,一直到获取锁,或者超时. unlock:删除redis中key)
网格系统-bootStrap4常用CSS笔记
.row 定义一行 .col 均分列数,最多一行12列.每列左右间隙各15px .col-{1到12} 定义在所有屏幕下的列宽 .col-{sm|md|lg|xl}-{1到12} 定义在指定屏幕下该列 ...
学习python最难的就是入门，而这文章刚好适合初学者！
Python可以应用于众多领域,如:数据分析.组件集成.网络服务.图像处理.数值计算和科学计算等众多领域.目前业内几乎所有大中型互联网企业都在使用Python,如:Youtube.Dropbox.BT ...
Netty源码分析第6章(解码器)---->第1节: ByteToMessageDecoder
Netty源码分析第六章: 解码器概述: 在我们上一个章节遗留过一个问题, 就是如果Server在读取客户端的数据的时候, 如果一次读取不完整, 就触发channelRead事件, 那么Netty是 ...

使用Crash工具查看一个TCP listen sock内存布局实例

使用Crash工具查看一个TCP listen sock内存布局实例的更多相关文章

随机推荐

热门专题