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kdump内核保存信息如下：
[ 366.504915][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 366.513430][ T18] task:systemd-udevd state:D stack: 0 pid: 287 ppid: 285 flags:0x00000809
[ 366.522467][ T18] Call trace:
[ 366.525602][ T18] __switch_to+0x7c/0xbc
[ 366.529691][ T18] __schedule+0x340/0x700
[ 366.533863][ T18] schedule+0x50/0xe0
[ 366.537689][ T18] schedule_timeout+0x29c/0x310
[ 366.542382][ T18] wait_for_common+0xf0/0x264
[ 366.546902][ T18] wait_for_completion+0x20/0x2c
[ 366.551683][ T18] public_key_verify_signature+0x2b0/0x340
[ 366.557332][ T18] public_key_verify_signature_2+0x1c/0x30
[ 366.562980][ T18] verify_signature+0x44/0x60
[ 366.567499][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 366.573929][ T18] pkcs7_validate_trust+0x50/0xc0
[ 366.578798][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 366.584098][ T18] verify_pkcs7_signature+0x74/0xb0
[ 366.589139][ T18] mod_verify_sig+0x98/0xe0
[ 366.593486][ T18] load_module+0x23c/0x850
[ 366.597745][ T18] __se_sys_finit_module+0xc4/0x130
[ 366.602786][ T18] __arm64_sys_finit_module+0x24/0x30
[ 366.608000][ T18] invoke_syscall+0x50/0x11c
[ 366.612433][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 366.617995][ T18] do_el0_svc+0x2c/0x9c
[ 366.621994][ T18] el0_svc+0x20/0x30
[ 366.625732][ T18] el0_sync_handler+0xb0/0xb4
[ 366.630251][ T18] el0_sync+0x160/0x180
[ 366.634667][ T18] INFO: task systemd-udevd:288 blocked for more than 120 seconds.
[ 366.642315][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 366.648224][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 366.656737][ T18] task:systemd-udevd state:D stack: 0 pid: 288 ppid: 285 flags:0x00000809
[ 366.665772][ T18] Call trace:
[ 366.668903][ T18] __switch_to+0x7c/0xbc
[ 366.672989][ T18] __schedule+0x340/0x700
[ 366.677162][ T18] schedule+0x50/0xe0
[ 366.680987][ T18] schedule_timeout+0x29c/0x310
[ 366.685680][ T18] wait_for_common+0xf0/0x264
[ 366.690200][ T18] wait_for_completion+0x20/0x2c
[ 366.694981][ T18] public_key_verify_signature+0x2b0/0x340
[ 366.700629][ T18] public_key_verify_signature_2+0x1c/0x30
[ 366.706277][ T18] verify_signature+0x44/0x60
[ 366.710797][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 366.717226][ T18] pkcs7_validate_trust+0x50/0xc0
[ 366.722095][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 366.727396][ T18] verify_pkcs7_signature+0x74/0xb0
[ 366.732436][ T18] mod_verify_sig+0x98/0xe0
[ 366.736782][ T18] load_module+0x23c/0x850
[ 366.741042][ T18] __se_sys_finit_module+0xc4/0x130
[ 366.746082][ T18] __arm64_sys_finit_module+0x24/0x30
[ 366.751296][ T18] invoke_syscall+0x50/0x11c
[ 366.755728][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 366.761288][ T18] do_el0_svc+0x2c/0x9c
[ 366.765287][ T18] el0_svc+0x20/0x30
[ 366.769025][ T18] el0_sync_handler+0xb0/0xb4
[ 366.773543][ T18] el0_sync+0x160/0x180
[ 487.323354][ T18] INFO: task systemd-udevd:287 blocked for more than 241 seconds.
[ 487.331004][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 487.336914][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 487.345426][ T18] task:systemd-udevd state:D stack: 0 pid: 287 ppid: 285 flags:0x00000809
[ 487.354462][ T18] Call trace:
[ 487.357595][ T18] __switch_to+0x7c/0xbc
[ 487.361683][ T18] __schedule+0x340/0x700
[ 487.365855][ T18] schedule+0x50/0xe0
[ 487.369681][ T18] schedule_timeout+0x29c/0x310
[ 487.374374][ T18] wait_for_common+0xf0/0x264
[ 487.378894][ T18] wait_for_completion+0x20/0x2c
[ 487.383674][ T18] public_key_verify_signature+0x2b0/0x340
[ 487.389322][ T18] public_key_verify_signature_2+0x1c/0x30
[ 487.394970][ T18] verify_signature+0x44/0x60
[ 487.399490][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 487.405920][ T18] pkcs7_validate_trust+0x50/0xc0
[ 487.410787][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 487.416088][ T18] verify_pkcs7_signature+0x74/0xb0
[ 487.421128][ T18] mod_verify_sig+0x98/0xe0
[ 487.425474][ T18] load_module+0x23c/0x850
[ 487.429733][ T18] __se_sys_finit_module+0xc4/0x130
[ 487.434774][ T18] __arm64_sys_finit_module+0x24/0x30
[ 487.439987][ T18] invoke_syscall+0x50/0x11c
[ 487.444419][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 487.449980][ T18] do_el0_svc+0x2c/0x9c
[ 487.453979][ T18] el0_svc+0x20/0x30
[ 487.457717][ T18] el0_sync_handler+0xb0/0xb4
[ 487.462236][ T18] el0_sync+0x160/0x180
[ 487.466498][ T18] INFO: task systemd-udevd:288 blocked for more than 241 seconds.
[ 487.474144][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 487.480052][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 487.488566][ T18] task:systemd-udevd state:D stack: 0 pid: 288 ppid: 285 flags:0x00000809
[ 487.497602][ T18] Call trace:
[ 487.500732][ T18] __switch_to+0x7c/0xbc
[ 487.504818][ T18] __schedule+0x340/0x700
[ 487.508990][ T18] schedule+0x50/0xe0
[ 487.512816][ T18] schedule_timeout+0x29c/0x310
[ 487.517509][ T18] wait_for_common+0xf0/0x264
[ 487.522028][ T18] wait_for_completion+0x20/0x2c
[ 487.526808][ T18] public_key_verify_signature+0x2b0/0x340
[ 487.532457][ T18] public_key_verify_signature_2+0x1c/0x30
[ 487.538104][ T18] verify_signature+0x44/0x60
[ 487.542624][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 487.549053][ T18] pkcs7_validate_trust+0x50/0xc0
[ 487.553920][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 487.559221][ T18] verify_pkcs7_signature+0x74/0xb0
[ 487.564261][ T18] mod_verify_sig+0x98/0xe0
[ 487.568609][ T18] load_module+0x23c/0x850
[ 487.572868][ T18] __se_sys_finit_module+0xc4/0x130
[ 487.577909][ T18] __arm64_sys_finit_module+0x24/0x30
[ 487.583123][ T18] invoke_syscall+0x50/0x11c
[ 487.587555][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 487.593115][ T18] do_el0_svc+0x2c/0x9c
[ 487.597114][ T18] el0_svc+0x20/0x30
[ 487.600851][ T18] el0_sync_handler+0xb0/0xb4
[ 487.605370][ T18] el0_sync+0x160/0x180
[ 608.155357][ T18] INFO: task systemd-udevd:287 blocked for more than 362 seconds.
[ 608.163007][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 608.168916][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 608.177429][ T18] task:systemd-udevd state:D stack: 0 pid: 287 ppid: 285 flags:0x00000809
[ 608.186466][ T18] Call trace:
[ 608.189598][ T18] __switch_to+0x7c/0xbc
[ 608.193685][ T18] __schedule+0x340/0x700
[ 608.197857][ T18] schedule+0x50/0xe0
[ 608.201682][ T18] schedule_timeout+0x29c/0x310
[ 608.206375][ T18] wait_for_common+0xf0/0x264
[ 608.210897][ T18] wait_for_completion+0x20/0x2c
[ 608.215677][ T18] public_key_verify_signature+0x2b0/0x340
[ 608.221325][ T18] public_key_verify_signature_2+0x1c/0x30
[ 608.226973][ T18] verify_signature+0x44/0x60
[ 608.231493][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 608.237922][ T18] pkcs7_validate_trust+0x50/0xc0
[ 608.242790][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 608.248091][ T18] verify_pkcs7_signature+0x74/0xb0
[ 608.253131][ T18] mod_verify_sig+0x98/0xe0
[ 608.257478][ T18] load_module+0x23c/0x850
[ 608.261737][ T18] __se_sys_finit_module+0xc4/0x130
[ 608.266778][ T18] __arm64_sys_finit_module+0x24/0x30
[ 608.271992][ T18] invoke_syscall+0x50/0x11c
[ 608.276424][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 608.281985][ T18] do_el0_svc+0x2c/0x9c
[ 608.285983][ T18] el0_svc+0x20/0x30
[ 608.289722][ T18] el0_sync_handler+0xb0/0xb4
[ 608.294241][ T18] el0_sync+0x160/0x180
[ 608.298508][ T18] INFO: task systemd-udevd:288 blocked for more than 362 seconds.
[ 608.306154][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 608.312063][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 608.320576][ T18] task:systemd-udevd state:D stack: 0 pid: 288 ppid: 285 flags:0x00000809
[ 608.329611][ T18] Call trace:
[ 608.332742][ T18] __switch_to+0x7c/0xbc
[ 608.336828][ T18] __schedule+0x340/0x700
[ 608.341000][ T18] schedule+0x50/0xe0
[ 608.344825][ T18] schedule_timeout+0x29c/0x310
[ 608.349519][ T18] wait_for_common+0xf0/0x264
[ 608.354039][ T18] wait_for_completion+0x20/0x2c
[ 608.358819][ T18] public_key_verify_signature+0x2b0/0x340
[ 608.364467][ T18] public_key_verify_signature_2+0x1c/0x30
[ 608.370115][ T18] verify_signature+0x44/0x60
[ 608.374635][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 608.381064][ T18] pkcs7_validate_trust+0x50/0xc0
[ 608.385931][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 608.391232][ T18] verify_pkcs7_signature+0x74/0xb0
[ 608.396272][ T18] mod_verify_sig+0x98/0xe0
[ 608.400618][ T18] load_module+0x23c/0x850
[ 608.404877][ T18] __se_sys_finit_module+0xc4/0x130
[ 608.409918][ T18] __arm64_sys_finit_module+0x24/0x30
[ 608.415131][ T18] invoke_syscall+0x50/0x11c
[ 608.419565][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 608.425125][ T18] do_el0_svc+0x2c/0x9c
[ 608.429124][ T18] el0_svc+0x20/0x30
[ 608.432862][ T18] el0_sync_handler+0xb0/0xb4
[ 608.437381][ T18] el0_sync+0x160/0x180
[ 728.987354][ T18] INFO: task systemd-udevd:287 blocked for more than 483 seconds.
[ 728.995004][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 729.000913][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 729.009427][ T18] task:systemd-udevd state:D stack: 0 pid: 287 ppid: 285 flags:0x00000809
[ 729.018463][ T18] Call trace:
[ 729.021595][ T18] __switch_to+0x7c/0xbc
[ 729.025683][ T18] __schedule+0x340/0x700
[ 729.029855][ T18] schedule+0x50/0xe0
[ 729.033680][ T18] schedule_timeout+0x29c/0x310
[ 729.038374][ T18] wait_for_common+0xf0/0x264
[ 729.042893][ T18] wait_for_completion+0x20/0x2c
[ 729.047674][ T18] public_key_verify_signature+0x2b0/0x340
[ 729.053322][ T18] public_key_verify_signature_2+0x1c/0x30
[ 729.058970][ T18] verify_signature+0x44/0x60
[ 729.063492][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 729.069921][ T18] pkcs7_validate_trust+0x50/0xc0
[ 729.074788][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 729.080089][ T18] verify_pkcs7_signature+0x74/0xb0
[ 729.085129][ T18] mod_verify_sig+0x98/0xe0
[ 729.089476][ T18] load_module+0x23c/0x850
[ 729.093735][ T18] __se_sys_finit_module+0xc4/0x130
[ 729.098776][ T18] __arm64_sys_finit_module+0x24/0x30
[ 729.103990][ T18] invoke_syscall+0x50/0x11c
[ 729.108422][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 729.113983][ T18] do_el0_svc+0x2c/0x9c
[ 729.117981][ T18] el0_svc+0x20/0x30
[ 729.121719][ T18] el0_sync_handler+0xb0/0xb4
[ 729.126238][ T18] el0_sync+0x160/0x180
[ 729.130641][ T18] INFO: task systemd-udevd:288 blocked for more than 483 seconds.
[ 729.138290][ T18] Not tainted 5.10.0-2203sp2.aarch64 #2
[ 729.144198][ T18] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 729.152711][ T18] task:systemd-udevd state:D stack: 0 pid: 288 ppid: 285 flags:0x00000809
[ 729.161746][ T18] Call trace:
[ 729.164877][ T18] __switch_to+0x7c/0xbc
[ 729.168965][ T18] __schedule+0x340/0x700
[ 729.173137][ T18] schedule+0x50/0xe0
[ 729.176962][ T18] schedule_timeout+0x29c/0x310
[ 729.181656][ T18] wait_for_common+0xf0/0x264
[ 729.186176][ T18] wait_for_completion+0x20/0x2c
[ 729.190956][ T18] public_key_verify_signature+0x2b0/0x340
[ 729.196604][ T18] public_key_verify_signature_2+0x1c/0x30
[ 729.202252][ T18] verify_signature+0x44/0x60
[ 729.206771][ T18] pkcs7_validate_trust_one.constprop.0+0x194/0x1d0
[ 729.213201][ T18] pkcs7_validate_trust+0x50/0xc0
[ 729.218067][ T18] verify_pkcs7_message_sig+0x94/0x150
[ 729.223369][ T18] verify_pkcs7_signature+0x74/0xb0
[ 729.228409][ T18] mod_verify_sig+0x98/0xe0
[ 729.232755][ T18] load_module+0x23c/0x850
[ 729.237014][ T18] __se_sys_finit_module+0xc4/0x130
[ 729.242055][ T18] __arm64_sys_finit_module+0x24/0x30
[ 729.247268][ T18] invoke_syscall+0x50/0x11c
[ 729.251700][ T18] el0_svc_common.constprop.0+0x158/0x164
[ 729.257261][ T18] do_el0_svc+0x2c/0x9c
[ 729.261260][ T18] el0_svc+0x20/0x30
[ 729.264998][ T18] el0_sync_handler+0xb0/0xb4
[ 729.269517][ T18] el0_sync+0x160/0x180

测试kdump功能正常