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kern/55416: kernel stalls in pipe operations
>Number: 55416
>Category: kern
>Synopsis: kernel stalls in pipe operations
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Jun 25 13:05:00 +0000 2020
>Originator: Martin Husemann
>Release: NetBSD 9.99.68
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD last-of-the-heroes.aprisoft.de 9.99.68 NetBSD 9.99.68 (GENERIC) #60: Wed Jun 24 18:45:34 CEST 2020 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/landisk/compile/GENERIC landisk
Architecture: sh3el
Machine: landisk
>Description:
Sometimes (on this machine quite often) during running atf tests the whole
machine locsk up early.
bin/sh/t_syntax (23/852): 21 test cases
a_basic_tokenisation: [3.246692s] Passed.
b_comments: [5.969400s] Passed.
c_line_wrapping: [10.130118s] Passed.
d_cstrings: [7.377581s] Passed.
f_redirects: [6.526749s] Passed.
g_variable_syntax: [142.673727s] Passed.
h_var_assign: [3.125363s] Passed.
i_pipelines:
Breaking into ddb works and shows:
db> ps
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
25554 25554 3 0 80 8df70980 cat pipe_rd
27471 27471 3 0 80 8ca1fa00 cat pipe_rd
28477>28477 7 0 0 8ca1f700 sh
26792 26792 2 0 0 8df70380 cat
19348 19348 2 0 0 8dd95680 cat
26409 26409 2 0 0 8e5aa6c0 cat
28248 28248 3 0 40080 8d81d040 sh wait
27638 27638 3 0 80 8ca1f400 atf-check wait
19156 19156 3 0 80 8fa9dc40 sh wait
2097 2097 3 0 80 8e5aa9c0 tail kqueue
811 811 3 0 80 8e5aacc0 tcsh pause
1535 1535 3 0 80 8fe20700 sshd select
1253 1253 3 0 80 8e5aa0c0 sshd poll
1203 1203 3 0 80 8dd95c80 tee pipe_rd
1171 1171 3 0 80 8dd95080 atf-report pipe_rd
1202 1202 3 0 80 8fe20a00 tee pipe_rd
1083 1083 3 0 80 8fa9d340 atf-run poll
920 920 3 0 80 8fa9d040 sh wait
176 176 3 0 80 8fe20d00 sh wait
1134 1134 3 0 c0 8fee8d00 getty ttyraw
1062 1062 3 0 80 8fa9d640 cron nanoslp
954 954 3 0 80 8e5aa3c0 inetd kqueue
919 919 3 0 80 8dd95980 sshd select
789 789 3 0 80 8dd95380 ntpd pause
410 410 3 0 80 8fa9d940 syslogd kqueue
1 1 3 0 80 8fe510c0 init wait
0 124 3 0 200 8fe519c0 physiod physiod
0 106 3 0 200 8fe20400 pooldrain pooldrain
0 105 3 0 200 8fe20100 ioflush syncer
0 104 3 0 40200 8fe51cc0 pgdaemon pgdaemon
0 100 3 0 200 8fee8a00 usb2 usbevt
0 99 3 0 200 8fee8700 usb1 usbevt
0 98 3 0 200 8fe516c0 usb0 usbevt
0 97 3 0 200 8fe513c0 npfgc0 npfgcw
0 96 3 0 200 8fe71c80 rt_free rt_free
0 57 3 0 200 8fe71980 unpgc unpgc
0 56 3 0 200 8fe71680 icmp6_wqinput/0 icmp6_wqinput
0 55 3 0 200 8fe71380 nd6_timer nd6_timer
0 54 3 0 200 8fe71080 carp6_wqinput/0 carp6_wqinput
0 31 3 0 200 8fec1040 carp_wqinput/0 carp_wqinput
0 30 3 0 200 8fec1340 icmp_wqinput/0 icmp_wqinput
0 29 3 0 200 8fec1640 rt_timer rt_timer
0 28 3 0 200 8fec1940 vmem_rehash vmem_rehash
0 27 3 0 200 8fec1c40 entbutler entropy
0 18 3 0 240 8fee8400 atabus0 atath
0 17 3 0 200 8fee8100 sysmon smtaskq
0 16 3 0 200 8ff2ecc0 usbtask-dr usbtsk
0 15 3 0 200 8ff2e9c0 usbtask-hc usbtsk
0 14 3 0 200 8ff2e6c0 pmfsuspend pmfsuspend
0 13 3 0 200 8ff2e3c0 pmfevent pmfevent
0 12 3 0 200 8ff2e0c0 sopendfree sopendfr
0 11 3 0 200 8ff5cc80 iflnkst iflnkst
0 10 3 0 200 8ff5c980 nfssilly nfssilly
0 9 3 0 240 8ff5c680 vdrain vdrain
0 8 3 0 200 8ff5c380 modunload mod_unld
0 7 3 0 200 8ff5c080 xcall/0 xcall
0 6 1 0 200 8ff75c40 softser/0
0 5 1 0 40200 8ff75940 softclk/0
0 4 1 0 40200 8ff75640 softbio/0
0 3 1 0 200 8ff75340 softnet/0
0 2 1 0 201 8ff75040 idle/0
0 0 3 0 200 8c3e9240 swapper uvm
db> t/l 8df70980
db_stack_trace_cmd() at 8c3eac40
[ 47854.9011462] sleepq_locks() at 0
db> t/l 8ca1fa00
db_stack_trace_cmd() at 8c3eaa80
[ 47854.9011462] sleepq_locks() at 0
db> bt
cpu_Debugger() at netbsd:scifintr+0x56
scifintr() at netbsd:intc_intr+0x5a
intc_intr() at 8c000676
<EXPEVT 000; SSR=400001c0> at netbsd:__pmap_pte_lookup+0x1a
[trapframe 0x7ff3f000]
sr=400001c0 gbr=6f3fa000 pc=8c00a032 pr=8c00a08a
r0=8cbcc000 r1=8e83c000 r2=40000101 r3=00010000
r4=8fe53dcc r6=7ff3e000 r7=7ff3f000 r8=00000000
r5=7ff3e000 r9=8fe53dcc r10=8c00a050 r11=8c1c7524
r12=8e4faa2c r13=1ffff000 r14=7ff3f000 sp=r15=c3155c90
__pmap_pte_lookup() at netbsd:pmap_remove+0x3a
pmap_remove() at netbsd:pmap_page_protect+0x78
pmap_page_protect() at netbsd:uvm_anfree+0x70
uvm_anfree() at netbsd:amap_wipeout+0x64
amap_wipeout() at netbsd:uvm_unmap_detach+0x44
uvm_unmap_detach() at netbsd:uvm_unmap1+0x38
uvm_unmap1() at netbsd:uvmspace_exec+0x5a
uvmspace_exec() at netbsd:execve_runproc+0x86
execve_runproc() at netbsd:execve1+0x38
execve1() at netbsd:sys_execve+0x1a
sys_execve() at netbsd:syscall+0xae
syscall() at netbsd:general_exception+0x184
db> sh uvmexp
Current UVM status:
pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12, ncolors=1
14959 VM pages: 3044 active, 1065 inactive, 2147 wired, 496 free
pages 3199 anon, 1686 file, 1327 exec
freemin=74, free-target=98, wired-max=4986
resv-pg=1, resv-kernel=5
bootpages=239, poolpages=8037
faults=4318395, traps=2841828, intrs=3569077, ctxswitch=383748
softint=88949, syscalls=2841827
fault counts:
noram=51, noanon=0, pgwait=0, pgrele=0
ok relocks(total)=2512(2512), anget(retrys)=1372755(7), amapcopy=802107
neighbor anon/obj pg=1091830/9065920, gets(lock/unlock)=2065539/2505
cases: anon=836818, anoncow=535937, obj=1809953, prcopy=255584, przero=84964
2
daemon and swap counts:
woke=169, revs=169, scans=136425, obscans=46197, anscans=58
busy=478, freed=46255, reactivate=1991, deactivate=144848
pageouts=4, pending=54, nswget=7
nswapdev=1, swpgavail=65531
swpages=65531, swpginuse=37, swpgonly=35, paging=0
>How-To-Repeat:
s/a
>Fix:
n/a
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