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Re: kern/58730: NFS client locks up waiting on nfscn2



The following reply was made to PR kern/58730; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/58730: NFS client locks up waiting on nfscn2
Date: Tue, 8 Oct 2024 18:10:30 +0200

 The client seems to loose all networking, on the server I see ARP requests
 from the client (with a longish delay between small batches).
 
 I am not sure why getty on the console hangs though (unless it is paged
 out, which seems unlikely).
 
 A bit more ddb output from another instance of the hang below.
 
 Martin
 
 db> ps
 PID     LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 5593   5593 3   0   1000000           c46d9180                 sh nfscn2
 22609 22609 3   0       180           c4716480               tail kqueue
 506     506 3   0       180           c2f72240               tcsh pause
 504     504 3   0       180           c340f900               rxvt select
 436     436 3   0       180           c2fdf880               tcsh pause
 1077   1077 3   0       180           c2f727c0       sshd-session poll
 1970   1970 3   0       180           c2f72d40       sshd-session poll
 288     288 3   0       180           c340fbc0                tee pipe_rd
 289     289 3   0       180           c36db6c0         atf-report pipe_rd
 290     290 3   0       180           c36db400                tee pipe_rd
 925     925 3   0       1c0           c2fdf300            atf-run pipe_rd
 350     350 3   0       180           c3604680                 sh wait
 340     340 3   0       180           c2f72500                 sh wait
 252     252 3   0         0           c2f44200              getty rwlock
 1654   1654 3   0        40           c36db140               cron nfssnd
 558     558 3   0       180           c3604c00              inetd kqueue
 730     730 3   0       180           c3604940               sshd poll
 200     200 3   0       180           c3604100               ntpd pause
 237     237 3   0       180           c340f640            rpcbind poll
 732     538 3   0       180           c340f380              named parked
 732     733 3   0       180           c340f0c0              timer parked
 732     638 3   0       180           c3055b80       isc-net-0001 kqueue
 732     765 3   0       180           c30558c0       isc-net-0000 kqueue
 732     732 3   0       180           c3055600              named sigwait
 757     757 3   0         0           c3055340            syslogd nfsrcv
 494     494 3   0       180           c2fdfb40             dhcpcd poll
 497     497 3   0       180           c2fdf5c0             dhcpcd poll
 492     492 3   0       180           c3055080             dhcpcd poll
 486     486 3   0       180           c2fdf040             dhcpcd poll
 91       91 3   0       180           c2f72a80            wdogctl nanoslp
 1         1 3   0       180           c2e99c80               init wait
 0     21568 5   0       240           c36043c0           (zombie)
 0      1650 3   0       200           c2f444c0            swapiod swapiod
 0       106 3   0       200           c2f44d00          pooldrain pooldrain
 0       105 3   0       240           c2f44a40            ioflush nfssnd
 0       104 3   0       200           c2f44780           pgdaemon pgdaemon
 0       101 3   0       200           c2ebdcc0              nfsio nfsiod
 0       100 3   0       200           c2ebda00              nfsio nfsiod
 0        99 3   0       200           c2ebd740              nfsio nfsiod
 0        98 3   0       200           c2ebd480              nfsio nfsiod
 0        97 3   0       200           c2e58140           swdmover swdmvr
 0        96 3   0       200           c2ebd1c0               usb0 usbevt
 0        60 3   0       200           c2e58400            rt_free rt_free
 0        59 3   0       200           c2e586c0              unpgc unpgc
 0        58 3   0       200           c2e58980    icmp6_wqinput/0 icmp6_wqinput
 0        57 3   0       200           c2e58c40          nd6_timer nd6_timer
 0        56 3   0       200           c2e99180     icmp_wqinput/0 icmp_wqinput
 0        55 3   0       200           c2e99440           rt_timer rt_timer
 0        31 3   0       200           c2e99700        vmem_rehash vmem_rehash
 0        30 3   0       200           c2e999c0             sdmmc0 mmctaskq
 0        21 3   0       200           c2b55c00          entbutler entropy
 0        20 3   0       240           c2b55940            atabus1 atath
 0        19 3   0       240           c2b55680            atabus0 atath
 0        18 3   0       200           c2b553c0         usbtask-dr usbtsk
 0        17 3   0       200           c2b55100         usbtask-hc usbtsk
 0        16 3   0       200           c2b39bc0             sysmon smtaskq
 0        15 3   0       200           c2b39900         pmfsuspend pmfsuspend
 0        14 3   0       200           c2b39640           pmfevent pmfevent
 0        13 3   0       200           c2b39380         sopendfree sopendfr
 0        12 3   0       200           c2b390c0             ifwdog ifwdog
 0        11 3   0       200           c2a6db80            iflnkst iflnkst
 0        10 3   0       200           c2a6d8c0           nfssilly nfssilly
 0         9 3   0       200           c2a6d600           pooldisp pooldisp
 0         8 3   0       200           c2a6d340          modunload mod_unld
 0         7 3   0       200           c2a6d080            xcall/0 xcall
 0         6 1   0       200           c2a6cb40          softser/0
 0         5 1   0     40200           c2a6c880          softclk/0
 0         4 1   0       200           c2a6c5c0          softbio/0
 0         3 1   0       200           c2a6c300          softnet/0
 0    >    2 1   0       201           c2a6c040             idle/0
 0         0 3   0       200           c051b700            swapper uvm
 db> show all tstiles
   PID   LID          COMMAND      WAITING-FOR     TYPE     WAIT-CHANNEL
  5593  5593               sh                0   kpause         c46d9180
 22609 22609             tail                0       cv         c470e8b8
   506   506             tcsh                0   kpause         c2f72240
   504   504             rxvt                0   select         c2a5d9c0
   436   436             tcsh                0   kpause         c2fdf880
  1077  1077     sshd-session                0   select         c2a5d9c0
  1970  1970     sshd-session                0   select         c2a5d9c0
   288   288              tee                0       cv         c2f6f704
   289   289       atf-report                0       cv         c2f6f654
   290   290              tee                0       cv         c2f6f5a4
   925   925          atf-run                0       cv         c2f6f7b4
   350   350               sh                0       cv         c35ff2cc
   340   340               sh                0       cv         c2eb27c4
   252   252            getty         c36db140   rwlock         c2f3e160
  1654  1654             cron                0       cv         c2b4994c
   558   558            inetd                0       cv         c36f1af8
   730   730             sshd                0   select         c2a5d9c0
   200   200             ntpd                0   kpause         c3604100
   237   237          rpcbind                0   select         c2a5d9c0
   732   538            named                0 lwp_park         c340f380
   732   733            named                0 lwp_park         c340f0c0
   732   638            named                0       cv         c340b378
   732   765            named                0       cv         c33fadf8
   732   732            named                0       cv         c3055768
   757   757          syslogd                0       cv         c2b49944
   494   494           dhcpcd                0   select         c2a5d9c0
   497   497           dhcpcd                0   select         c2a5d9c0
   492   492           dhcpcd                0   select         c2a5d9c0
   486   486           dhcpcd                0   select         c2a5d9c0
    91    91          wdogctl                0   kpause         c2f72a80
     1     1             init                0       cv         c2eb202c
     0  1650           system                0       cv         c35f6aec
     0   106           system                0       cv netbsd:uvmpd_pool_drain_c
 v
     0   105           system                0       cv         c2b4994c
     0   104           system                0    sleep  netbsd:uvm+0x68
     0   101           system                0       cv         c2f38604
     0   100           system                0       cv         c2f38584
     0    99           system                0       cv         c2f38504
     0    98           system                0       cv         c2f38484
     0    97           system                0    sleep netbsd:swdmover_cv
     0    96           system                0       cv         c2b4e264
     0    60           system                0       cv         c2e9aaec
     0    59           system                0       cv netbsd:unp_thread_cv
     0    58           system                0       cv         c2e9a8ac
     0    57           system                0       cv         c2e9a7ec
     0    56           system                0       cv         c2e9a66c
     0    55           system                0       cv         c2e9a5ac
     0    31           system                0       cv         c2e9a2ac
     0    30           system                0       cv         c2e40b8c
     0    21           system                0       cv netbsd:entropy_global+0xf
 0
     0    20           system                0       cv         c2e4e10c
     0    19           system                0       cv         c2b5390c
     0    18           system                0       cv netbsd:usb_taskq+0x2c
     0    17           system                0       cv netbsd:usb_taskq+0xc
     0    16           system                0       cv netbsd:sysmon_task_queue_
 cv
     0    15           system                0       cv         c2a6bbac
     0    14           system                0       cv         c2a6baec
     0    13           system                0       cv netbsd:pendfree_thread_cv
 
     0    12           system                0       cv         c2a6b96c
     0    11           system                0       cv         c2a6b8ac
     0    10           system                0       cv         c2a6b72c
     0     9           system                0       cv         c2a6b4d4
     0     8           system                0       cv netbsd:module_thread_cv
     0     7           system                0       cv netbsd:cpu_info_store+0x8
 
     0     0           system                0   kpause      netbsd:lwp0
 


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