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【标题描述】【2309】NetworkManager，lo设备连接状态变更
一、缺陷信息
内核信息：
kernel-6.4.0-3.0.0.11.oe2309
缺陷简述
softdog加载后打开设备，旧版本可以直接卸载，新版本不可卸载
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watchdog_softdog_noboot_panic
测试步骤：
1：加载softdog，modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
2：打开设备
#include <linux/watchdog.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#define WDT_DEVICE_FILE "/dev/watchdog"
int main(void)
{
int g_watchdog_fd = open(WDT_DEVICE_FILE, O_RDWR);
if (g_watchdog_fd < 0) {
printf("Error in file open WDT device file(%s)...\n", WDT_DEVICE_FILE);
return 0;
}
}
3：预期卸载成功，实际卸载设备报错： Modulesoftdog is in use
Wei Li
成员
5.10内核，920物理机环境：
[root@openEuler tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 0/0 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
[root@openEuler tracing]# modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
[root@openEuler tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 3/3 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
modprobe-7275 [001] ..... 5397.078772: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7275 [001] ..... 5397.078797: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7275 [001] ..... 5397.081018: module_put: softdog call_site=do_init_module refcnt=1
[root@openEuler tracing]# rmmod softdog
[root@openEuler tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 3/3 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
modprobe-7275 [001] ..... 5397.078772: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7275 [001] ..... 5397.078797: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7275 [001] ..... 5397.081018: module_put: softdog call_site=do_init_module refcnt=1
[root@openEuler tracing]#
[root@openEuler tracing]#
[root@openEuler tracing]# modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
[root@openEuler tracing]# cat /dev/watchdog
cat: /dev/watchdog: Invalid argument
[root@openEuler tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 8/8 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
modprobe-7275 [001] ..... 5397.078772: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7275 [001] ..... 5397.078797: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7275 [001] ..... 5397.081018: module_put: softdog call_site=do_init_module refcnt=1
modprobe-7295 [001] ..... 5418.999244: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7295 [001] ..... 5418.999269: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7295 [001] ..... 5419.001520: module_put: softdog call_site=do_init_module refcnt=1
cat-7303 [003] ..... 5425.340671: module_get: softdog call_site=watchdog_open refcnt=2
cat-7303 [003] ..... 5425.340673: module_get: softdog call_site=softdog_ping [softdog] refcnt=3
[root@openEuler tracing]# rmmod softdog
rmmod: ERROR: Module softdog is in use
[root@openEuler tracing]# echo V > /dev/watchdog
[root@openEuler tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 10/10 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
modprobe-7275 [001] ..... 5397.078772: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7275 [001] ..... 5397.078797: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7275 [001] ..... 5397.081018: module_put: softdog call_site=do_init_module refcnt=1
modprobe-7295 [001] ..... 5418.999244: module_get: sha2_ce call_site=__crypto_alg_lookup refcnt=2
modprobe-7295 [001] ..... 5418.999269: module_put: sha2_ce call_site=crypto_mod_put refcnt=1
modprobe-7295 [001] ..... 5419.001520: module_put: softdog call_site=do_init_module refcnt=1
cat-7303 [003] ..... 5425.340671: module_get: softdog call_site=watchdog_open refcnt=2
cat-7303 [003] ..... 5425.340673: module_get: softdog call_site=softdog_ping [softdog] refcnt=3
bash-7106 [001] ..... 5439.288824: module_put: softdog call_site=softdog_stop [softdog] refcnt=2
bash-7106 [001] ..... 5439.288826: module_put: softdog call_site=watchdog_release refcnt=1
[root@openEuler tracing]# rmmod softdog
[root@openEuler tracing]#
[root@openEuler tracing]# uname -a
Linux openEuler 6.4.0-8.0.0.17.oe2309.aarch64 #1 SMP Mon Sep 18 17:41:45 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
[root@openEuler tracing]#
6.4内核，920虚拟机环境：
[root@localhost tracing]# modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 5/5 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
[root@localhost tracing]# lsmod | grep soft
softdog 20480 0
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 5/5 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
[root@localhost tracing]#
[root@localhost tracing]#
[root@localhost tracing]# rmmod
rmmod: ERROR: missing module name.
[root@localhost tracing]# rmmod softdog
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 5/5 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
[root@localhost tracing]#
[root@localhost tracing]# modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
[root@localhost tracing]#
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 10/10 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
[root@localhost tracing]#
[root@localhost tracing]#
[root@localhost tracing]# cat /dev/watchdog
cat: /dev/watchdog: Invalid argument
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 12/12 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
cat-8208 [076] .... 26335.674296: module_get: sbsa_gwdt call_site=watchdog_open refcnt=2
cat-8208 [076] .N.. 26335.680374: module_put: sbsa_gwdt call_site=watchdog_release refcnt=1
[root@localhost tracing]# rmmod softdog
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 12/12 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
cat-8208 [076] .... 26335.674296: module_get: sbsa_gwdt call_site=watchdog_open refcnt=2
cat-8208 [076] .N.. 26335.680374: module_put: sbsa_gwdt call_site=watchdog_release refcnt=1
[root@localhost tracing]# rmmod sbsa_gwdt
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 12/12 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
cat-8208 [076] .... 26335.674296: module_get: sbsa_gwdt call_site=watchdog_open refcnt=2
cat-8208 [076] .N.. 26335.680374: module_put: sbsa_gwdt call_site=watchdog_release refcnt=1
[root@localhost tracing]#
[root@localhost tracing]#
[root@localhost tracing]#
[root@localhost tracing]#
[root@localhost tracing]# modprobe softdog soft_margin=30 soft_noboot=1 soft_panic=1
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 17/17 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
cat-8208 [076] .... 26335.674296: module_get: sbsa_gwdt call_site=watchdog_open refcnt=2
cat-8208 [076] .N.. 26335.680374: module_put: sbsa_gwdt call_site=watchdog_release refcnt=1
modprobe-8244 [076] .... 26466.132492: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8244 [076] .... 26466.132713: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8244 [076] .... 26466.132723: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8244 [076] .... 26466.133661: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8244 [076] .N.. 26466.156601: module_put: softdog call_site=do_init_module refcnt=1
[root@localhost tracing]#
[root@localhost tracing]# cat /dev/watchdog
cat: /dev/watchdog: Invalid argument
[root@localhost tracing]# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 20/20 #P:128
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
modprobe-8139 [076] .... 26013.243861: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8139 [076] .... 26013.244084: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8139 [076] .... 26013.244094: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8139 [076] .... 26013.245029: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8139 [076] .N.. 26013.268177: module_put: softdog call_site=do_init_module refcnt=1
modprobe-8204 [076] .... 26319.039041: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8204 [076] .... 26319.039266: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8204 [076] .... 26319.039276: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8204 [076] .... 26319.040220: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8204 [076] .N.. 26319.063150: module_put: softdog call_site=do_init_module refcnt=1
cat-8208 [076] .... 26335.674296: module_get: sbsa_gwdt call_site=watchdog_open refcnt=2
cat-8208 [076] .N.. 26335.680374: module_put: sbsa_gwdt call_site=watchdog_release refcnt=1
modprobe-8244 [076] .... 26466.132492: module_get: sha2_ce call_site=crypto_mod_get refcnt=3
modprobe-8244 [076] .... 26466.132713: module_put: sha2_ce call_site=crypto_mod_put refcnt=2
modprobe-8244 [076] .... 26466.132723: module_get: hisi_hpre call_site=crypto_mod_get refcnt=2
modprobe-8244 [076] .... 26466.133661: module_put: hisi_hpre call_site=crypto_mod_put refcnt=1
modprobe-8244 [076] .N.. 26466.156601: module_put: softdog call_site=do_init_module refcnt=1
cat-8250 [076] .... 26477.606665: module_get: softdog call_site=watchdog_open refcnt=2
cat-8250 [076] .... 26477.606667: module_get: softdog call_site=softdog_ping [softdog] refcnt=3
cat-8250 [076] .N.. 26477.612734: module_put: softdog call_site=watchdog_release refcnt=2
[root@localhost tracing]# lsmod | grep soft
softdog 20480 1
[root@localhost tracing]# rmmod softdog
rmmod: ERROR: Module softdog is in use
[root@localhost tracing]# echo V > /dev/watchdog
[root@localhost tracing]# rmmod softdog
[root@localhost tracing]#
[root@localhost tracing]# uname -a
Linux localhost.localdomain 5.10.0zjh01+ #13 SMP Wed Sep 20 09:14:17 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
[root@localhost tracing]#
对比5.10和6.4内核代码，softdog的逻辑没有差异。
问题现象的原因是在5.10内核上注册了sbsa_gwdt，打开/dev/watchdog设备其实不是操作的softdog，卸载后现象一致
相同物理机环境换6.4内核，sbsa_gwdt驱动也能正常加载：
[root@localhost ~]# ls /dev/watchdog
/dev/watchdog
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# lsmod | grep sbsa
sbsa_gwdt 12288 0
[root@localhost ~]# uname -a
Linux localhost.localdomain 6.4.0-8.0.0.16.oe2309.aarch64 #1 SMP Wed Sep 13 18:29:22 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
[root@localhost ~]#
综上，怀疑是测试环境加载了其他watchdog导致，请测试确认
Wei Li
成员
如果后端确实是softdog，卸载前需要先写入魔术字去使能：
echo V > /dev/watchdog
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