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Re: assert failed: sc->sc_parent->dk_rawopens > NUM



Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
assert failed: sc->sc_parent->dk_rawopens > NUM

[  59.7957801] panic: kernel diagnostic assertion "sc->sc_parent->dk_rawopens > 0" failed: file "/syzkaller/jobs/netbsd/kernel/sys/dev/dkwedge/dk.c", line 1224 
[  59.8157625] cpu1: Begin traceback...
[  59.8357691] vpanic() at netbsd:vpanic+0xc9d
[  59.8757744] kern_assert() at netbsd:kern_assert+0x228
[  59.9257692] dklastclose() at netbsd:dklastclose+0x553 sys/dev/dkwedge/dk.c:1223
[  59.9757714] dkwedge_detach() at netbsd:dkwedge_detach+0x497 dkwedge_cleanup_parent sys/dev/dkwedge/dk.c:585 [inline]
[  59.9757714] dkwedge_detach() at netbsd:dkwedge_detach+0x497 sys/dev/dkwedge/dk.c:618
[  60.0257703] config_detach() at netbsd:config_detach+0xf9e sys/kern/subr_autoconf.c:2045
[  60.0757718] dkwedge_del1() at netbsd:dkwedge_del1+0x54b sys/dev/dkwedge/dk.c:574
[  60.1257714] dkwedge_delall1() at netbsd:dkwedge_delall1+0x2b0
[  60.1657741] disk_ioctl() at netbsd:disk_ioctl+0xc96
[  60.2157694] dk_ioctl() at netbsd:dk_ioctl+0x6d5 sys/dev/dksubr.c:642
[  60.2657785] sdioctl() at netbsd:sdioctl+0x4b5 sys/dev/scsipi/sd.c:1006
[  60.3157703] cdev_ioctl() at netbsd:cdev_ioctl+0x43a sys/kern/subr_devsw.c:1248
[  60.3557762] spec_ioctl() at netbsd:spec_ioctl+0x2c6
[  60.4057670] VOP_IOCTL() at netbsd:VOP_IOCTL+0x2f0
[  60.4557689] vn_ioctl() at netbsd:vn_ioctl+0x337 sys/kern/vfs_vnops.c:868
[  60.4957701] sys_ioctl() at netbsd:sys_ioctl+0xd84 sys/kern/sys_generic.c:675
[  60.5457689] sys___syscall() at netbsd:sys___syscall+0x2c6 sys/kern/sys_syscall.c:90
[  60.5957783] syscall() at netbsd:syscall+0x60c sy_invoke sys/sys/syscallvar.h:94 [inline]
[  60.5957783] syscall() at netbsd:syscall+0x60c sys/arch/x86/x86/syscall.c:138
[  60.6057636] --- syscall (number 54 via SYS_syscall) ---
[  60.6257621] netbsd:syscall+0x60c:
[  60.6257621] cpu1: End traceback...
[  60.6357630] fatal breakpoint trap in supervisor mode
[  60.6357630] trap type 1 code 0 rip 0xffffffff802228ad cs 0x8 rflags 0x282 cr2 0x72e3aec50009 ilevel 0 rsp 0xffff8400c7b22f30
[  60.6457522] curlwp 0xffff84001346c180 pid 1321.1239 lowest kstack 0xffff8400c7b1c2c0
Stopped in pid 1321.1239 (syz-executor.3) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0xc9d
kern_assert() at netbsd:kern_assert+0x228
dklastclose() at netbsd:dklastclose+0x553 sys/dev/dkwedge/dk.c:1223
dkwedge_detach() at netbsd:dkwedge_detach+0x497 dkwedge_cleanup_parent sys/dev/dkwedge/dk.c:585 [inline]
dkwedge_detach() at netbsd:dkwedge_detach+0x497 sys/dev/dkwedge/dk.c:618
config_detach() at netbsd:config_detach+0xf9e sys/kern/subr_autoconf.c:2045
dkwedge_del1() at netbsd:dkwedge_del1+0x54b sys/dev/dkwedge/dk.c:574
dkwedge_delall1() at netbsd:dkwedge_delall1+0x2b0
disk_ioctl() at netbsd:disk_ioctl+0xc96
dk_ioctl() at netbsd:dk_ioctl+0x6d5 sys/dev/dksubr.c:642
sdioctl() at netbsd:sdioctl+0x4b5 sys/dev/scsipi/sd.c:1006
cdev_ioctl() at netbsd:cdev_ioctl+0x43a sys/kern/subr_devsw.c:1248
spec_ioctl() at netbsd:spec_ioctl+0x2c6
VOP_IOCTL() at netbsd:VOP_IOCTL+0x2f0
vn_ioctl() at netbsd:vn_ioctl+0x337 sys/kern/vfs_vnops.c:868
sys_ioctl() at netbsd:sys_ioctl+0xd84 sys/kern/sys_generic.c:675
sys___syscall() at netbsd:sys___syscall+0x2c6 sys/kern/sys_syscall.c:90
syscall() at netbsd:syscall+0x60c sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x60c sys/arch/x86/x86/syscall.c:138
--- syscall (number 54 via SYS_syscall) ---
netbsd:syscall+0x60c:
Panic string: kernel diagnostic assertion "sc->sc_parent->dk_rawopens > 0" failed: file "/syzkaller/jobs/netbsd/kernel/sys/dev/dkwedge/dk.c", line 1224
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
1319  1319 2   1         0   ffff840013538a40     syz-executor.4
1197  1208 2   1       100   ffff8400135381c0     syz-executor.0
1197  1197 2   0  10000000   ffff84001346c5c0     syz-executor.0
1214  1214 2   1         0   ffff8400134569c0     syz-executor.5
1321  1279 3   0       180   ffff84001346ca00     syz-executor.3 parked
1321 >1239 7   1         0   ffff84001346c180     syz-executor.3
1321  1321 2   0  10000140   ffff840013456580     syz-executor.3
324    324 2   0       140   ffff84001343f980     syz-executor.0
335  > 335 7   0       140   ffff84001343f540     syz-executor.3
1201  1350 2   0         0   ffff840013547640       syz-execprog
1201  1210 3   1       180   ffff840013538600       syz-execprog wait
1201  1110 3   0       180   ffff84001343f100       syz-execprog wait
1201   330 3   0       180   ffff8400122cab00       syz-execprog parked
1201   331 3   0       180   ffff8400122ca6c0       syz-execprog kqueue
1201  1203 2   0       100   ffff8400122ca280       syz-execprog
1201  1207 3   0       180   ffff840012b6b900       syz-execprog parked
1201  1072 3   1       180   ffff840012b6b4c0       syz-execprog parked
1201  1232 3   0       180   ffff840012b6b080       syz-execprog wait
1201  1198 3   0       1c0   ffff84001336b940       syz-execprog wait
1201  1383 2   0       140   ffff84001336b500       syz-execprog
1201  1201 3   1     40180   ffff84001336b0c0       syz-execprog parked
1385  1385 3   0       180   ffff8400124c5740               sshd select
1184  1184 3   0       180   ffff840012b438c0              getty nanoslp
1081  1081 3   0       180   ffff8400121c0ac0              getty nanoslp
989    989 3   1       180   ffff8400121c0680              getty nanoslp
1074  1074 3   1       1c0   ffff8400121a4a40              getty ttyraw
1101  1101 3   1       180   ffff840012b43480               sshd select
957    957 3   1       180   ffff840012b43040             powerd kqueue
692    692 2   1       100   ffff8400125ef340            syslogd
741    741 3   0       180   ffff8400125efbc0             dhcpcd poll
547    547 3   0       180   ffff8400124372c0             dhcpcd poll
742    742 3   0       180   ffff840012437b40             dhcpcd poll
594    594 3   0       180   ffff8400125ef780             dhcpcd poll
292    292 3   0       180   ffff8400124c5b80             dhcpcd poll
290    290 3   0       180   ffff840012437700             dhcpcd poll
289    289 3   0       180   ffff8400124c5300             dhcpcd poll
1        1 3   0       180   ffff840011ecb100               init wait
0      735 3   0       200   ffff8400121bd200            physiod physiod
0      195 3   0       200   ffff8400121c0240          pooldrain pooldrain
0      194 3   1       200   ffff8400121bda80            ioflush syncer
0      193 3   1       200   ffff8400121bd640           pgdaemon pgdaemon
0      172 3   0       200   ffff8400121a4600               usb7 usbevt
0      170 3   0       200   ffff8400121a41c0               usb6 usbevt
0      168 3   0       200   ffff84001210ca00               usb5 usbevt
0      166 3   0       200   ffff84001210c5c0               usb4 usbevt
0      165 3   0       200   ffff84001210c180               usb3 usbevt
0       31 3   0       200   ffff8400120759c0               usb2 usbevt
0       63 3   0       200   ffff840012075580               usb1 usbevt
0      126 3   1       200   ffff840012075140               usb0 usbevt
0      125 3   1       200   ffff840011ecb980         usbtask-dr usbtsk
0      124 3   1       200   ffff8400103f5b00         usbtask-hc usbtsk
0      123 3   0       200   ffff840011ecb540             npfgc0 npfgcw
0      122 3   1       200   ffff840011ebc940            rt_free rt_free
0      121 3   1       200   ffff840011ebc500              unpgc unpgc
0      120 2   1       200   ffff840011ebc0c0    key_timehandler
0      119 3   1       200   ffff840011eb6900    icmp6_wqinput/1 icmp6_wqinput
0      118 3   0       200   ffff840011eb64c0    icmp6_wqinput/0 icmp6_wqinput
0      117 3   0       200   ffff840011eb6080          nd6_timer nd6_timer
0      116 3   1       200   ffff840011e9b8c0    carp6_wqinput/1 carp6_wqinput
0      115 3   0       200   ffff840011e9b480    carp6_wqinput/0 carp6_wqinput
0      114 3   1       200   ffff840011cddb80     carp_wqinput/1 carp_wqinput
0      113 3   0       200   ffff840011cdd740     carp_wqinput/0 carp_wqinput
0      112 3   1       200   ffff840011ce0bc0     icmp_wqinput/1 icmp_wqinput
0      111 3   0       200   ffff840011ce0780     icmp_wqinput/0 icmp_wqinput
0      110 3   1       200   ffff840011e9b040           rt_timer rt_timer
0      109 3   1       200   ffff840011ce0340        vmem_rehash vmem_rehash
0      100 3   0       200   ffff840011cdd300          entbutler entropy
0       99 3   1       200   ffff8400117e0b40              viomb balloon
0       98 3   1       200   ffff8400117e0700      vioif0_txrx/1 vioif0_txrx
0       97 3   0       200   ffff8400117e02c0      vioif0_txrx/0 vioif0_txrx
0       30 3   0       200   ffff8400103f56c0           scsibus0 sccomp
0       29 3   0       200   ffff8400103f5280               pms0 pmsreset
0       28 3   1       200   ffff8400103daac0            xcall/1 xcall
0       27 1   1       200   ffff8400103da680          softser/1
0       26 3   1       200   ffff8400103da240          softclk/1 tstile
0       25 1   1       200   ffff8400103d8a80          softbio/1
0       24 1   1       200   ffff8400103d8640          softnet/1
0       23 1   1       201   ffff8400103d8200             idle/1
0       22 3   0       200   ffff84000f1f3a40           lnxsyswq lnxsyswq
0       21 3   0       200   ffff84000f1f3600           lnxubdwq lnxubdwq
0       20 3   0       200   ffff84000f1f31c0           lnxpwrwq lnxpwrwq
0       19 3   0       200   ffff84000f1f1a00           lnxlngwq lnxlngwq
0       18 3   0       200   ffff84000f1f15c0           lnxhipwq lnxhipwq
0       17 3   0       200   ffff84000f1f1180           lnxrcugc lnxrcugc
0       16 3   0       200   ffff84000f1ec9c0             sysmon smtaskq
0       15 3   0       200   ffff84000f1ec580         pmfsuspend pmfsuspend
0       14 3   0       200   ffff84000f1ec140           pmfevent pmfevent
0       13 3   0       200   ffff84000f1e8980         sopendfree sopendfr
0       12 3   0       200   ffff84000f1e8540             ifwdog ifwdog
0       11 3   1       200   ffff84000f1e8100            iflnkst iflnkst
0       10 3   0       200   ffff84000f1df940           nfssilly nfssilly
0        9 3   0       200   ffff84000f1df500             vdrain vdrain
0        8 3   1       200   ffff84000f1df0c0          modunload mod_unld
0        7 3   0       200   ffff84000ebdb900            xcall/0 xcall
0        6 1   0       200   ffff84000ebdb4c0          softser/0
0    >   5 7   0       200   ffff84000ebdb080          softclk/0
0        4 1   0       200   ffff84000ebd98c0          softbio/0
0        3 1   0       200   ffff84000ebd9480          softnet/0
0        2 1   0       201   ffff84000ebd9040             idle/0
0        0 3   0       200   ffffffff86868e00            swapper uvm
[Locks tracked through LWPs]

****** LWP 1319.1319 (syz-executor.4) @ 0xffff840013538a40, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffff840012b62a80 type     :     sleep/adaptive
initialized  : 0xffffffff818f6f00
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff840013538a40 last held: 0xffff840013538a40
last locked* : 0xffffffff819116cd unlocked : 0xffffffff8190444d
owner field  : 0xffff840013538a40 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1197.1208 (syz-executor.0) @ 0xffff8400135381c0, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at config_init)
lock address : 0xffffffff86875560 type     :     sleep/adaptive
initialized  : 0xffffffff852dfe59
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff8400135381c0 last held: 000000000000000000
last locked  : 0xffffffff852ef6d6 unlocked*: 0xffffffff852efac1
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 1321.1279 (syz-executor.3) @ 0xffff84001346ca00, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at config_init)
lock address : 0xffffffff86875560 type     :     sleep/adaptive
initialized  : 0xffffffff852dfe59
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  1
relevant lwp : 0xffff84001346ca00 last held: 000000000000000000
last locked  : 0xffffffff852ef6d6 unlocked*: 0xffffffff852efac1
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 1321.1239 (syz-executor.3) @ 0xffff84001346c180, l_stat=7

*** Locks held:

* Lock 0 (initialized at dkwedge_init)
lock address : 0xffffffff868c1c60 type     :     sleep/adaptive
initialized  : 0xffffffff8578db01
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff84001346c180 last held: 0xffff84001346c180
last locked* : 0xffffffff85786536 unlocked : 0xffffffff8578baac
owner/count  : 0xffff84001346c180 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at disk_init)
lock address : 0xffff840011e9d868 type     :     sleep/adaptive
initialized  : 0xffffffff8533b1d8
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff84001346c180 last held: 0xffff84001346c180
last locked* : 0xffffffff857867d3 unlocked : 0xffffffff85782536
owner field  : 0xffff84001346c180 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

* Lock 2 (initialized at disk_init)
lock address : 0xffff840011cdcd10 type     :     sleep/adaptive
initialized  : 0xffffffff8533b1a9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff84001346c180 last held: 0xffff84001346c180
last locked* : 0xffffffff85786950 unlocked : 0xffffffff85786d55
owner field  : 0xffff84001346c180 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1201.1350 (syz-execprog) @ 0xffff840013547640, l_stat=2

*** Locks held:

* Lock 0 (initialized at amap_ctor)
lock address : 0xffff84001334a640 type     :     sleep/adaptive
initialized  : 0xffffffff84f33dbf
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff840013547640 last held: 0xffff840013547640
last locked* : 0xffffffff84f6a658 unlocked : 0xffffffff84f7b939
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 692.692 (syslogd) @ 0xffff8400125ef340, l_stat=2

*** Locks held:

* Lock 0 (initialized at vcache_alloc)
lock address : 0xffff84001325b440 type     :     sleep/adaptive
initialized  : 0xffffffff856a2986
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff8400125ef340 last held: 0xffff8400125ef340
last locked* : 0xffffffff85730c26 unlocked : 0xffffffff85730fd5
owner/count  : 0xffff8400125ef340 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at genfs_node_init)
lock address : 0xffff840013257dd8 type     :     sleep/adaptive
initialized  : 0xffffffff857313fe
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff8400125ef340 last held: 0xffff8400125ef340
last locked* : 0xffffffff84ecac8d unlocked : 0xffffffff84ecafa3
owner/count  : 0xffff8400125ef340 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 547.547 (dhcpcd) @ 0xffff8400124372c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff8400124372c0 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 742.742 (dhcpcd) @ 0xffff840012437b40, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff840012437b40 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 290.290 (dhcpcd) @ 0xffff840012437700, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff840012437700 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 289.289 (dhcpcd) @ 0xffff8400124c5300, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff8400124c5300 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffff84000f1e8100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffff84000f1e8100 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.5 (softclk/0) @ 0xffff84000ebdb080, l_stat=7

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffff84000ebdb080 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.0 (swapper) @ 0xffffffff86868e00, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff868f7e40 type     :     sleep/adaptive
initialized  : 0xffffffff851aa9b3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffffff86868e00 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

[Locks tracked through CPUs]

******* Locks held on cpu1:

* Lock 0 (initialized at main)
lock address : 0xffffffff868f7d40 type     :               spin
initialized  : 0xffffffff8508dc74
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff84001346c180 last held: 0xffff84001346c180
last locked* : 0xffffffff852ef384 unlocked : 0xffffffff852f05c5
curcpu holds :                  1 wanted by: 000000000000000000

* Lock 1 (initialized at kprintf_init)
lock address : 0xffffffff868aac00 type     :               spin
initialized  : 0xffffffff853c869c
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffff84001346c180 last held: 0xffff84001346c180
last locked* : 0xffffffff853c94c4 unlocked : 0xffffffff853d71eb
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffff840000017180 0001 00000000                0x0                0x0
0xffff840000017200 0041 00000000                0x0                0x0
0xffff840000017280 0041 00000000                0x0                0x0
0xffff840000017300 0041 00000000                0x0                0x0
0xffff840000017380 0041 00000000                0x0                0x0
0xffff840000017400 0041 00000000                0x0                0x0
0xffff840000017480 0041 00000000                0x0                0x0
0xffff840000017500 0041 00000000                0x0                0x0
0xffff840000017580 0041 00000000                0x0                0x0
0xffff840000017600 0041 00000000                0x0                0x0
0xffff840000017680 0041 00000000                0x0                0x0
0xffff840000017700 0041 00000000                0x0                0x0
0xffff840000017780 0041 00000000                0x0                0x0
0xffff840000017800 0041 00000000                0x0                0x0
0xffff840000017880 0041 00000000                0x0                0x0
0xffff840000017900 0041 00000000                0x0                0x0
0xffff840000017980 0041 00000000                0x0                0x0
0xffff840000017a00 0041 00000000                0x0                0x0
0xffff840000017a80 0041 00000000                0x0                0x0
0xffff840000017b00 0041 00000000                0x0                0x0
0xffff840000017b80 0041 00000000                0x0                0x0
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0xffff840000025000 0001 00000000                0x0                0x0
0xffff840000025080 0001 00000000                0x0                0x0
0xffff840000025100 0001 00000000                0x0                0x0
0xffff840000025180 0001 00000000                0x0                0x0
0xffff840000025200 0001 00000000                0x0                0x0
0xffff840000025280 0001 00000000                0x0                0x0
0xffff840000025300 0001 00000000                0x0                0x0
0xffff840000025380 0001 00000000                0x0                0x0
0xffff840000025400 0001 00000000                0x0                0x0
0xffff840000025480 0001 00000000                0x0                0x0
0xffff840000025500 0001 00000000                0x0                0x0
0xffff840000025580 0001 00000000                0x0                0x0
0xffff840000025600 0001 00000000                0x0                0x0
0xffff840000025680 0001 00000000                0x0                0x0
0xffff840000025700 0001 00000000                0x0                0x0
0xffff840000025780 0001 00000000                0x0                0x0
0xffff840000025800 0001 00000000                0x0                0x0
0xffff840000025880 0001 00000000                0x0                0x0
0xffff840000025900 0001 00000000                0x0                0x0
0xffff840000025980 0001 00000000                0x0                0x0
0xffff840000025a00 0001 00000000                0x0                0x0
0xffff840000025a80 0001 00000000                0x0                0x0
0xffff840000025b00 0001 00000000                0x0                0x0
0xffff840000025b80 0001 00000000                0x0                0x0
0xffff840000025c00 0001 00000000                0x0                0x0
0xffff840000025c80 0001 00000000                0x0                0x0
0xffff840000025d00 0001 00000000                0x0                0x0
0xffff840000025d80 0001 00000000                0x0                0x0
0xffff840000025e00 0001 00000000                0x0                0x0
0xffff840000025e80 0001 00000000                0x0                0x0
0xffff840000025f00 0001 00000000                0x0                0x0
0xffff840000025f80 0001 00000000                0x0                0x0
0xffff840000026000 0001 00000000                0x0                0x0
0xffff840000026080 0001 00000000                0x0                0x0
0xffff840000026100 0001 00000000                0x0                0x0
0xffff840000026180 0001 00000000                0x0                0x0
0xffff840000026200 0001 00000000                0x0                0x0
0xffff840000026280 0001 00000000                0x0                0x0
0xffff840000026300 0001 00000000                0x0                0x0
0xffff840000026380 0001 00000000                0x0                0x0
0xffff840000026400 0001 00000000                0x0                0x0
0xffff840000026480 0001 00000000                0x0                0x0
0xffff840000026500 0001 00000000                0x0                0x0
0xffff840000026580 0001 00000000                0x0                0x0
0xffff840000026600 0001 00000000                0x0                0x0
0xffff840000026680 0001 00000000                0x0                0x0
0xffff840000026700 0001 00000000                0x0                0x0
0xffff840000026780 0001 00000000                0x0                0x0
0xffff840000026800 0001 00000000                0x0                0x0
0xffff840000026880 0001 00000000                0x0                0x0
0xffff840000026900 0001 00000000                0x0                0x0
0xffff840000026980 0001 00000000                0x0                0x0
0xffff840000026a00 0001 00000000                0x0                0x0
0xffff840000026a80 0001 00000000                0x0                0x0
0xffff840000026b00 0001 00000000                0x0                0x0
0xffff840000026b80 0001 00000000                0x0                0x0
0xffff840000026c00 0001 00000000                0x0                0x0
0xffff840000026c80 0001 00000000                0x0                0x0
0xffff840000026d00 0001 00000000                0x0                0x0
0xffff840000026d80 0001 00000000                0x0                0x0
0xffff840000026e00 0001 00000000                0x0                0x0
0xffff840000026e80 0001 00000000                0x0                0x0
0xffff840000026f00 0001 00000000                0x0                0x0
0xffff840000026f80 0001 00000000                0x0                0x0
0xffff840000027000 0001 00000000                0x0                0x0
0xffff840000027080 0001 00000000                0x0                0x0
0xffff840000027100 0001 00000000                0x0                0x0
0xffff840000027180 0001 00000000                0x0                0x0
0xffff840000027200 0001 00000000                0x0                0x0
0xffff840000027280 0001 00000000                0x0                0x0
0xffff840000027300 0001 00000000                0x0                0x0
0xffff840000027380 0001 00000000                0x0                0x0
0xffff840000027400 0001 00000000                0x0                0x0
0xffff840000027480 0001 00000000                0x0                0x0
0xffff840000027500 0001 00000000                0x0                0x0
0xffff840000027580 0001 00000000                0x0                0x0
0xffff840000027600 0001 00000000                0x0                0x0
0xffff840000027680 0001 00000000                0x0                0x0
0xffff840000027700 0001 00000000                0x0                0x0
0xffff840000027780 0001 00000000                0x0                0x0
0xffff840000027800 0001 00000000                0x0                0x0
0xffff840000027880 0001 00000000                0x0                0x0
0xffff840000027900 0001 00000000                0x0                0x0
0xffff840000027980 0001 00000000                0x0                0x0
0xffff840000027a00 0001 00000000                0x0                0x0
0xffff840000027a80 0001 00000000                0x0                0x0
0xffff840000027b00 0001 00000000                0x0                0x0
0xffff840000027b80 0001 00000000                0x0                0x0
0xffff840000027c00 0001 00000000                0x0                0x0
0xffff840000027c80 0001 00000000                0x0                0x0
0xffff840000027d00 0001 00000000                0x0                0x0
0xffff840000027d80 0001 00000000                0x0                0x0
0xffff840000027e00 0001 00000000                0x0                0x0
0xffff840000027e80 0001 00000000                0x0                0x0
0xffff840000027f00 0001 00000000                0x0                0x0
0xffff840000027f80 0001 00000000                0x0                0x0
0xffff840000028000 0001 00000000                0x0                0x0
0xffff840000028080 0001 00000000                0x0                0x0
0xffff840000028100 0001 00000000                0x0                0x0
0xffff840000028180 0001 00000000                0x0                0x0
0xffff840000028200 0001 00000000                0x0                0x0
0xffff840000028280 0001 00000000                0x0                0x0
0xffff840000028300 0001 00000000                0x0                0x0
0xffff840000028380 0001 00000000                0x0                0x0
0xffff840000028400 0001 00000000                0x0                0x0
0xffff840000028480 0001 00000000                0x0                0x0
0xffff840000028500 0001 00000000                0x0                0x0
0xffff840000028580 0001 00000000                0x0                0x0
0xffff840000028600 0001 00000000                0x0                0x0
0xffff840000028680 0001 00000000                0x0                0x0
0xffff840000028700 0001 00000000                0x0                0x0
0xffff840000028780 0001 00000000                0x0                0x0
0xffff840000028800 0001 00000000                0x0                0x0
0xffff840000028880 0001 00000000                0x0                0x0
0xffff840000028900 0001 00000000                0x0                0x0
0xffff840000028980 0001 00000000                0x0                0x0
0xffff840000028a00 0001 00000000                0x0                0x0
0xffff840000028a80 0001 00000000                0x0                0x0
0xffff840000028b00 0001 00000000                0x0                0x0
0xffff840000028b80 0001 00000000                0x0                0x0
0xffff840000028c00 0001 00000000                0x0                0x0
0xffff840000028c80 0001 00000000                0x0                0x0
0xffff840000028d00 0001 00000000                0x0                0x0
0xffff840000028d80 0001 00000000                0x0                0x0
0xffff840000028e00 0001 00000000                0x0                0x0
0xffff840000028e80 0001 00000000                0x0                0x0
0xffff840000028f00 0001 00000000                0x0                0x0
0xffff840000028f80 0001 00000000                0x0                0x0
0xffff840000029000 0001 00000000                0x0                0x0
0xffff840000029080 0001 00000000                0x0                0x0
0xffff840000029100 0001 00000000                0x0                0x0
0xffff840000029180 0001 00000000                0x0                0x0
0xffff840000029200 0001 00000000                0x0                0x0
0xffff840000029280 0001 00000000                0x0                0x0
0xffff840000029300 0001 00000000                0x0                0x0
0xffff840000029380 0001 00000000                0x0                0x0
0xffff840000029400 0001 00000000                0x0                0x0
0xffff840000029480 0001 00000000                0x0                0x0
0xffff840000029500 0001 00000000                0x0                0x0
0xffff840000029580 0001 00000000                0x0                0x0
0xffff840000029600 0001 00000000                0x0                0x0
0xffff840000029680 0001 00000000                0x0                0x0
0xffff840000029700 0001 00000000                0x0                0x0
0xffff840000029780 0001 00000000                0x0                0x0
0xffff840000029800 0001 00000000                0x0                0x0
0xffff840000029880 0001 00000000                0x0                0x0
0xffff840000029900 0001 00000000                0x0                0x0
0xffff840000029980 0001 00000000                0x0                0x0
0xffff840000029a00 0001 00000000                0x0                0x0
0xffff840000029a80 0001 00000000                0x0                0x0
0xffff840000029b00 0001 00000000                0x0                0x0
0xffff840000029b80 0001 00000000                0x0                0x0
0xffff840000029c00 0001 00000000                0x0                0x0
0xffff840000029c80 0001 00000000                0x0                0x0
0xffff840000029d00 0001 00000000                0x0                0x0
0xffff840000029d80 0001 00000000                0x0                0x0
0xffff840000029e00 0001 00000000                0x0                0x0
0xffff840000029e80 0001 00000000                0x0                0x0
0xffff840000029f00 0001 00000000                0x0                0x0
0xffff840000029f80 0001 00000000                0x0                0x0
0xffff84000002a000 0001 00000000                0x0                0x0
0xffff84000002a080 0001 00000000                0x0                0x0
0xffff84000002a100 0001 00000000                

Tested on:

commit:         69d8b3b7 Simplify the check for what ioctls can be don..
git tree:       https://github.com/NetBSD/src trunk
console output: https://syzkaller.appspot.com/x/log.txt?x=17893b45080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=739e57438eb9ed9e
dashboard link: https://syzkaller.appspot.com/bug?extid=4076654b4f6ab4c97c19
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63

Note: no patches were applied.

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