[systemd-devel] Question: systemd-resolved.service delayed almost 90s start after systemd-sysctl.service

[Alien Kong]

Hello,

>
I found that systemd entered the D state. From the kernel stack, it was
blocked at __skb_wait_for_more_packets.
Is there any way to determine where the problem occurred? Thank you~

*# cat /proc/1/stack*

> [<0>] __skb_wait_for_more_packets+0x134/0x1a0
> [<0>] __unix_dgram_recvmsg+0xdc/0x380
> [<0>] unix_seqpacket_recvmsg+0x60/0xa0
> [<0>] ____sys_recvmsg+0x1f8/0x2b0
> [<0>] ___sys_recvmsg+0x98/0x100
> [<0>] __sys_recvmsg+0x88/0xf0
> [<0>] __arm64_sys_recvmsg+0x2c/0x40
> [<0>] invoke_syscall+0x50/0x140
> [<0>] el0_svc_common.constprop.0+0x68/0x140
> [<0>] do_el0_svc+0x2c/0x90
> [<0>] el0_svc+0x30/0xb0
> [<0>] el0t_64_sync_handler+0x124/0x130
> [<0>] el0t_64_sync+0x190/0x194


*# cat /proc/1/status*

> Name:        systemd
> Umask:        0000
> State:        D (disk sleep)
> Tgid:        1
> Ngid:        0
> Pid:        1
> PPid:        0
> TracerPid:        0
> Uid:        0        0        0        0
> Gid:        0        0        0        0
> FDSize:        256
> Groups:
> NStgid:        1
> NSpid:        1
> NSpgid:        1
> NSsid:        1
> VmPeak:           22332 kB
> VmSize:           22296 kB
> VmLck:               0 kB
> VmPin:               0 kB
> VmHWM:           12840 kB
> VmRSS:           12836 kB
> RssAnon:            3932 kB
> RssFile:            8904 kB
> RssShmem:               0 kB
> VmData:            3340 kB
> VmStk:             132 kB
> VmExe:              84 kB
> VmLib:           15676 kB
> VmPTE:              84 kB
> VmSwap:               0 kB
> HugetlbPages:               0 kB
> CoreDumping:        0
> THP_enabled:        0
> Threads:        1
> SigQ:        2/239905
> SigPnd:        0000000000000000
> ShdPnd:        0000000000010000
> SigBlk:        7fefc1fe28014a03
> SigIgn:        0000000000001000
> SigCgt:        00000000000004ec
> CapInh:        0000000000000000
> CapPrm:        000001ffffffffff
> CapEff:        000001ffffffffff
> CapBnd:        000001ffffffffff
> CapAmb:        0000000000000000
> NoNewPrivs:        0
> Seccomp:        0
> Seccomp_filters:        0
> Speculation_Store_Bypass:        thread vulnerable
> SpeculationIndirectBranch:        unknown
> Cpus_allowed:        fff
> Cpus_allowed_list:        0-11
> Mems_allowed:        0001
> Mems_allowed_list:        0
> voluntary_ctxt_switches:        2594
> nonvoluntary_ctxt_switches:        576


Best regards,
Alien Kong
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