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Re: assert failed: dev->dv_detaching == curlwp



Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
assert failed: (det = dev->dv_detaching) == curlwp

[  83.8501393] panic: kernel diagnostic assertion "(det = dev->dv_detaching) == curlwp" failed: file "/syzkaller/jobs/netbsd/kernel/sys/kern/subr_autoconf.c", line 2182 lwp 2758 [syz-executor.1] @ 0xffffab0013452100 detaching
[  83.8701316] cpu1: Begin traceback...
[  83.8801311] vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
[  83.9101315] _sub_D_65535_0() at netbsd:_sub_D_65535_0+-0x202c
[  83.9401339] config_detach_commit() at netbsd:config_detach_commit+0xe7 sys/kern/subr_autoconf.c:2182
[  83.9601331] cdev_detached() at netbsd:cdev_detached+0x155 sys/kern/subr_devsw.c:1358
[  83.9901365] vdevgone() at netbsd:vdevgone+0x1b8 sys/kern/vfs_subr.c:524
[  84.0201345] audiodetach() at netbsd:audiodetach+0xaa sys/dev/audio/audio.c:1371
[  84.0501312] config_detach() at netbsd:config_detach+0x389 sys/kern/subr_autoconf.c:2042
[  84.0701311] config_detach_children() at netbsd:config_detach_children+0xda sys/kern/subr_autoconf.c:2205
[  84.1101316] pad_detach() at netbsd:pad_detach+0x70 sys/dev/pad/pad.c:251
[  84.1301295] config_detach() at netbsd:config_detach+0x389 sys/kern/subr_autoconf.c:2042
[  84.1601328] fops_pad_close() at netbsd:fops_pad_close+0x86 pad_close sys/dev/pad/pad.c:423 [inline]
[  84.1601328] fops_pad_close() at netbsd:fops_pad_close+0x86 sys/dev/pad/pad.c:433
[  84.1901329] closef() at netbsd:closef+0x152 sys/kern/kern_descrip.c:832
[  84.2201318] fd_free() at netbsd:fd_free+0x528 sys/kern/kern_descrip.c:1571
[  84.2401311] exit1() at netbsd:exit1+0x306 sys/kern/kern_exit.c:301
[  84.2701312] sys_exit() at netbsd:sys_exit+0x92 sys/kern/kern_exit.c:180
[  84.3001293] syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
[  84.3001293] syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
[  84.3001293] syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
[  84.3101290] --- syscall (number 1) ---
[  84.3201291] netbsd:syscall+0x25a:
[  84.3201291] cpu1: End traceback...
[  84.3201291] fatal breakpoint trap in supervisor mode
[  84.3301259] trap type 1 code 0 rip 0xffffffff80220a4d cs 0x8 rflags 0x286 cr2 0x7e3ef316f410 ilevel 0 rsp 0xffffab019dc3a4d0
[  84.3401239] curlwp 0xffffab0013446940 pid 2636.2636 lowest kstack 0xffffab019dc332c0
Stopped in pid 2636.2636 (syz-executor.3) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0x105 sys/ddb/db_panic.c:69
vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
_sub_D_65535_0() at netbsd:_sub_D_65535_0+-0x202c
config_detach_commit() at netbsd:config_detach_commit+0xe7 sys/kern/subr_autoconf.c:2182
cdev_detached() at netbsd:cdev_detached+0x155 sys/kern/subr_devsw.c:1358
vdevgone() at netbsd:vdevgone+0x1b8 sys/kern/vfs_subr.c:524
audiodetach() at netbsd:audiodetach+0xaa sys/dev/audio/audio.c:1371
config_detach() at netbsd:config_detach+0x389 sys/kern/subr_autoconf.c:2042
config_detach_children() at netbsd:config_detach_children+0xda sys/kern/subr_autoconf.c:2205
pad_detach() at netbsd:pad_detach+0x70 sys/dev/pad/pad.c:251
config_detach() at netbsd:config_detach+0x389 sys/kern/subr_autoconf.c:2042
fops_pad_close() at netbsd:fops_pad_close+0x86 pad_close sys/dev/pad/pad.c:423 [inline]
fops_pad_close() at netbsd:fops_pad_close+0x86 sys/dev/pad/pad.c:433
closef() at netbsd:closef+0x152 sys/kern/kern_descrip.c:832
fd_free() at netbsd:fd_free+0x528 sys/kern/kern_descrip.c:1571
exit1() at netbsd:exit1+0x306 sys/kern/kern_exit.c:301
sys_exit() at netbsd:sys_exit+0x92 sys/kern/kern_exit.c:180
syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
--- syscall (number 1) ---
netbsd:syscall+0x25a:
Panic string: kernel diagnostic assertion "(det = dev->dv_detaching) == curlwp" failed: file "/syzkaller/jobs/netbsd/kernel/sys/kern/subr_autoconf.c", line 2182 lwp 2758 [syz-executor.1] @ 0xffffab0013452100 detaching
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
2872 >2872 7   0  10040000   ffffab0013cb15c0     syz-executor.5
2636 >2636 7   1  10040000   ffffab0013446940     syz-executor.3
2922  2922 2   0  10000040   ffffab0013cc01c0     syz-executor.0
3028  2777 2   1         0   ffffab0012ccaa00     syz-executor.2
3028  2740 2   1         0   ffffab0012cca5c0     syz-executor.2
3028  2885 3   0     40180   ffffab0012c7b8c0     syz-executor.2 parked
3028  3028 2   0  10040140   ffffab0013cc0a40     syz-executor.2
2769  2769 2   0  10040000   ffffab001339fa80     syz-executor.4
2758  2758 2   0  10040040   ffffab0013452100     syz-executor.1
1210  1210 2   0       140   ffffab0013d306c0     syz-executor.5
1200  1200 2   1       140   ffffab0013d0f680     syz-executor.0
1209  1209 2   0       140   ffffab0013d0f240     syz-executor.4
1213  1213 2   1       140   ffffab0013cfea80     syz-executor.1
323    323 2   0       140   ffffab0013cfe640     syz-executor.3
334    334 2   1       140   ffffab0013cfe200     syz-executor.2
1186  1078 3   0       180   ffffab0012b839c0       syz-execprog parked
1186   329 3   1       180   ffffab0012b83580       syz-execprog parked
1186   330 3   1       180   ffffab0012b83140       syz-execprog parked
1186  1380 3   0       180   ffffab0012b62980       syz-execprog parked
1186  1199 3   0       180   ffffab0012b62540       syz-execprog kqueue
1186  1243 3   0       180   ffffab0012c0a6c0       syz-execprog parked
1186  1196 3   1       180   ffffab0012b46940       syz-execprog parked
1186  1254 3   0       180   ffffab0012b460c0       syz-execprog parked
1186  1235 3   1       1c0   ffffab0012aa2080       syz-execprog parked
1186  1237 3   0       180   ffffab0012bae5c0       syz-execprog parked
1186  1186 3   1       180   ffffab0012bca600       syz-execprog parked
1239  1239 3   0       180   ffffab0012bcaa40               sshd select
1069  1069 3   0       180   ffffab0012ca6540              getty nanoslp
1074  1074 3   0       180   ffffab00126cb040              getty nanoslp
1070  1070 3   0       180   ffffab0013475580              getty nanoslp
1259  1259 3   0       1c0   ffffab0013475140              getty ttyraw
926    926 3   1       180   ffffab0013391600               sshd select
949    949 3   1       180   ffffab0012d036c0             powerd kqueue
689    689 2   1       100   ffffab00133c9b00            syslogd
602    602 3   0       180   ffffab0012c1c700             dhcpcd poll
547    547 3   1       180   ffffab0012c89900             dhcpcd poll
464    464 3   0       180   ffffab0012c50b80             dhcpcd poll
589    589 3   1       180   ffffab0012c50300             dhcpcd poll
289    289 3   0       180   ffffab0012d92080             dhcpcd poll
288    288 3   1       180   ffffab0012d7b8c0             dhcpcd poll
351    351 3   0       180   ffffab0012d7b480             dhcpcd poll
1        1 3   0       180   ffffab00128549c0               init wait
0      968 3   0       200   ffffab0012974ac0            physiod physiod
0      194 3   0       200   ffffab001298bb00          pooldrain pooldrain
0      193 3   1       200   ffffab001298b6c0            ioflush syncer
0      192 3   1       200   ffffab001298b280           pgdaemon pgdaemon
0      169 3   1       200   ffffab0012974240               usb7 usbevt
0      167 3   1       200   ffffab001292ea80               usb6 usbevt
0      165 3   1       200   ffffab001292e640               usb5 usbevt
0      164 3   1       200   ffffab001292e200               usb4 usbevt
0       31 3   1       200   ffffab00128e0a40               usb3 usbevt
0       63 3   1       200   ffffab00128e0600               usb2 usbevt
0      126 3   1       200   ffffab00128e01c0               usb1 usbevt
0      125 3   0       200   ffffab001286ca00               usb0 usbevt
0      124 3   1       200   ffffab001286c5c0         usbtask-dr usbtsk
0      123 3   1       200   ffffab00120b66c0         usbtask-hc usbtsk
0      122 3   1       200   ffffab001286c180             npfgc0 npfgcw
0      121 3   1       200   ffffab0012854580            rt_free rt_free
0      120 3   1       200   ffffab0012854140              unpgc unpgc
0      119 3   1       200   ffffab00126f9980    key_timehandler key_timehandler
0      118 3   1       200   ffffab00126f9540    icmp6_wqinput/1 icmp6_wqinput
0      117 3   0       200   ffffab00126f9100    icmp6_wqinput/0 icmp6_wqinput
0      116 3   0       200   ffffab00126ee940          nd6_timer nd6_timer
0      115 3   1       200   ffffab00126ee500    carp6_wqinput/1 carp6_wqinput
0      114 3   0       200   ffffab00126ee0c0    carp6_wqinput/0 carp6_wqinput
0      113 3   1       200   ffffab00126df900     carp_wqinput/1 carp_wqinput
0      112 3   0       200   ffffab00126df4c0     carp_wqinput/0 carp_wqinput
0      111 3   1       200   ffffab00126df080     icmp_wqinput/1 icmp_wqinput
0      110 3   0       200   ffffab00126cb8c0     icmp_wqinput/0 icmp_wqinput
0      109 3   0       200   ffffab00126cb480           rt_timer rt_timer
0      108 3   1       200   ffffab00126cabc0        vmem_rehash vmem_rehash
0       99 3   0       200   ffffab00120bbb40          entbutler entropy
0       98 3   1       200   ffffab00120bb700              viomb balloon
0       97 3   1       200   ffffab00120bb2c0      vioif0_txrx/1 vioif0_txrx
0       96 3   0       200   ffffab00120b6b00      vioif0_txrx/0 vioif0_txrx
0       29 3   0       200   ffffab00120b6280           scsibus0 sccomp
0       28 3   0       200   ffffab0010cbaac0               pms0 pmsreset
0       27 3   1       200   ffffab0010cba680            xcall/1 xcall
0       26 1   1       200   ffffab0010cba240          softser/1
0       25 1   1       200   ffffab0010cb9a80          softclk/1
0       24 1   1       200   ffffab0010cb9640          softbio/1
0       23 1   1       200   ffffab0010cb9200          softnet/1
0       22 1   1       201   ffffab000fb55a40             idle/1
0       21 3   0       200   ffffab000fb55600           lnxsyswq lnxsyswq
0       20 3   0       200   ffffab000fb551c0           lnxubdwq lnxubdwq
0       19 3   0       200   ffffab000fb54a00           lnxpwrwq lnxpwrwq
0       18 3   0       200   ffffab000fb545c0           lnxlngwq lnxlngwq
0       17 3   0       200   ffffab000fb54180           lnxhipwq lnxhipwq
0       16 3   0       200   ffffab000fb4b9c0           lnxrcugc lnxrcugc
0       15 3   0       200   ffffab000fb4b580             sysmon smtaskq
0       14 3   0       200   ffffab000fb4b140         pmfsuspend pmfsuspend
0       13 3   0       200   ffffab000fb48980           pmfevent pmfevent
0       12 3   0       200   ffffab000fb48540         sopendfree sopendfr
0       11 3   1       200   ffffab000fb48100            iflnkst iflnkst
0       10 3   0       200   ffffab000fb3c940           nfssilly nfssilly
0        9 3   0       200   ffffab000fb3c500             vdrain vdrain
0        8 3   0       200   ffffab000fb3c0c0          modunload mod_unld
0        7 3   0       200   ffffab000fb33900            xcall/0 xcall
0        6 1   0       200   ffffab000fb334c0          softser/0
0    >   5 7   0       200   ffffab000fb33080          softclk/0
0        4 1   0       200   ffffab000fb318c0          softbio/0
0        3 1   0       200   ffffab000fb31480          softnet/0
0        2 1   0       201   ffffab000fb31040             idle/0
0        0 3   0       200   ffffffff833411c0            swapper uvm
[Locks tracked through LWPs]

****** LWP 2872.2872 (syz-executor.5) @ 0xffffab0013cb15c0, l_stat=7

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffab0012b40b50 type     :     sleep/adaptive
initialized  : 0xffffffff81af2c4b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  1
relevant lwp : 0xffffab0013cb15c0 last held: 0xffffab0013cb15c0
last locked* : 0xffffffff81aeeecb unlocked : 000000000000000000
owner/count  : 0xffffab0013cb15c0 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at main)
lock address : 0xffffffff8347fbc0 type     :               spin
initialized  : 0xffffffff81f62dae
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  1
relevant cpu :                  0 last held:                  1
relevant lwp : 0xffffab0013cb15c0 last held: 0xffffab0013446940
last locked* : 0xffffffff81b480f0 unlocked : 0xffffffff81ac47e6
curcpu holds :                  3 wanted by: 000000000000000000

****** LWP 2636.2636 (syz-executor.3) @ 0xffffab0013446940, l_stat=7

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffab0012b40450 type     :     sleep/adaptive
initialized  : 0xffffffff81af2c4b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffab0013446940 last held: 0xffffab0013446940
last locked* : 0xffffffff81aeeecb unlocked : 000000000000000000
owner/count  : 0xffffab0013446940 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at config_init)
lock address : 0xffffffff83575160 type     :     sleep/adaptive
initialized  : 0xffffffff81b8865a
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffab0013446940 last held: 0xffffab0013446940
last locked* : 0xffffffff81b8ae3c unlocked : 0xffffffff81b8b778
owner field  : 0xffffab0013446940 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 2922.2922 (syz-executor.0) @ 0xffffab0013cc01c0, l_stat=2

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffab0012a04a90 type     :     sleep/adaptive
initialized  : 0xffffffff81af2c4b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  1
relevant lwp : 0xffffab0013cc01c0 last held: 0xffffab0013cc01c0
last locked* : 0xffffffff81aeeecb unlocked : 000000000000000000
owner/count  : 0xffffab0013cc01c0 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 2769.2769 (syz-executor.4) @ 0xffffab001339fa80, l_stat=2

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffab0012b68810 type     :     sleep/adaptive
initialized  : 0xffffffff81af2c4b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffab001339fa80 last held: 0xffffab001339fa80
last locked* : 0xffffffff81aeeecb unlocked : 000000000000000000
owner/count  : 0xffffab001339fa80 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 2758.2758 (syz-executor.1) @ 0xffffab0013452100, l_stat=2

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffab0012ba2850 type     :     sleep/adaptive
initialized  : 0xffffffff81af2c4b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffab0013452100 last held: 0xffffab0013452100
last locked* : 0xffffffff81aeeecb unlocked : 000000000000000000
owner/count  : 0xffffab0013452100 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 689.689 (syslogd) @ 0xffffab00133c9b00, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at filedesc_ctor)
lock address : 0xffffab00133facc0 type     :     sleep/adaptive
initialized  : 0xffffffff81aca8fc
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffab00133c9b00 last held: 000000000000000000
last locked  : 0xffffffff81ae23fd unlocked*: 0xffffffff81ae29ac
owner field  : 0xffffab00133c9b00 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 547.547 (dhcpcd) @ 0xffffab0012c89900, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffab0012c89900 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 464.464 (dhcpcd) @ 0xffffab0012c50b80, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffab0012c50b80 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 288.288 (dhcpcd) @ 0xffffab0012d7b8c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffab0012d7b8c0 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 351.351 (dhcpcd) @ 0xffffab0012d7b480, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffab0012d7b480 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) @ 0xffffab000fb48100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffab000fb48100 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) @ 0xffffab000fb33080, l_stat=7

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffab000fb33080 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) @ 0xffffffff833411c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347fcc0 type     :     sleep/adaptive
initialized  : 0xffffffff81b11e51
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffffff833411c0 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 : 0xffffffff8347fbc0 type     :               spin
initialized  : 0xffffffff81f62dae
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffab0013446940 last held: 0xffffab0013446940
last locked* : 0xffffffff81b480f0 unlocked : 0xffffffff81ac47e6
curcpu holds :                  3 wanted by: 000000000000000000

* Lock 1 (initialized at kprintf_init)
lock address : 0xffffffff8358aea0 type     :               spin
initialized  : 0xffffffff81bc3fd5
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffab0013446940 last held: 0xffffab0013446940
last locked* : 0xffffffff81bc4046 unlocked : 0xffffffff81bc40a4
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffffab0000017180 0041 00000000                0x0                0x0
0xffffab0000017200 0041 00000000                0x0                0x0
0xffffab0000017280 0041 00000000                0x0                0x0
0xffffab0000017300 0041 00000000                0x0                0x0
0xffffab0000017380 0041 00000000                0x0                0x0
0xffffab0000017400 0041 00000000                0x0                0x0
0xffffab0000017480 0041 00000000                0x0                0x0
0xffffab0000017500 0041 00000000                0x0                0x0
0xffffab0000017580 0041 00000000                0x0                0x0
0xffffab0000017600 0041 00000000                0x0                0x0
0xffffab0000017680 0041 00000000                0x0                0x0
0xffffab0000017700 0041 00000000                0x0                0x0
0xffffab0000017780 0041 00000000                0x0                0x0
0xffffab0000017800 0041 00000000                0x0                0x0
0xffffab0000017880 0041 00000000                0x0                0x0
0xffffab0000017900 0041 00000000                0x0                0x0
0xffffab0000017980 0041 00000000                0x0                0x0
0xffffab0000017a00 0041 00000000                0x0                0x0
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0xffffab0000024e80 0001 00000000                0x0                0x0
0xffffab0000024f00 0001 00000000                0x0                0x0
0xffffab0000024f80 0001 00000000                0x0                0x0
0xffffab0000025000 0001 00000000                0x0                0x0
0xffffab0000025080 0001 00000000                0x0                0x0
0xffffab0000025100 0001 00000000                0x0                0x0
0xffffab0000025180 0001 00000000                0x0                0x0
0xffffab0000025200 0001 00000000                0x0                0x0
0xffffab0000025280 0001 00000000                0x0                0x0
0xffffab0000025300 0001 00000000                0x0                0x0
0xffffab0000025380 0001 00000000                0x0                0x0
0xffffab0000025400 0001 00000000                0x0                0x0
0xffffab0000025480 0001 00000000                0x0                0x0
0xffffab0000025500 0001 00000000                0x0                0x0
0xffffab0000025580 0001 00000000                0x0                0x0
0xffffab0000025600 0001 00000000                0x0                0x0
0xffffab0000025680 0001 00000000                0x0                0x0
0xffffab0000025700 0001 00000000                0x0                0x0
0xffffab0000025780 0001 00000000                0x0                0x0
0xffffab0000025800 0001 00000000                0x0                0x0
0xffffab0000025880 0001 00000000                0x0                0x0
0xffffab0000025900 0001 00000000                0x0                0x0
0xffffab0000025980 0001 00000000                0x0                0x0
0xffffab0000025a00 0001 00000000                0x0                0x0
0xffffab0000025a80 0001 00000000                0x0                0x0
0xffffab0000025b00 0001 00000000                0x0                0x0
0xffffab0000025b80 0001 00000000                0x0                0x0
0xffffab0000025c00 0001 00000000                0x0                0x0
0xffffab0000025c80 0001 00000000                0x0                0x0
0xffffab0000025d00 0001 00000000                0x0                0x0
0xffffab0000025d80 0001 00000000                0x0                0x0
0xffffab0000025e00 0001 00000000                0x0                0x0
0xffffab0000025e80 0001 00000000                0x0                0x0
0xffffab0000025f00 0001 00000000                0x0                0x0
0xffffab0000025f80 0001 00000000                0x0                0x0
0xffffab0000026000 0001 00000000                0x0                0x0
0xffffab0000026080 0001 00000000                0x0                0x0
0xffffab0000026100 0001 00000000                0x0                0x0
0xffffab0000026180 0001 00000000                0x0                0x0
0xffffab0000026200 0001 00000000                0x0                0x0
0xffffab0000026280 0001 00000000                0x0                0x0
0xffffab0000026300 0001 00000000                0x0                0x0
0xffffab0000026380 0001 00000000                0x0                0x0
0xffffab0000026400 0001 00000000                0x0                0x0
0xffffab0000026480 0001 00000000                0x0                0x0
0xffffab0000026500 0001 00000000                0x0                0x0
0xffffab0000026580 0001 00000000                0x0                0x0
0xffffab0000026600 0001 00000000                0x0                0x0
0xffffab0000026680 0001 00000000                0x0                0x0
0xffffab0000026700 0001 00000000                0x0                0x0
0xffffab0000026780 0001 00000000                0x0                0x0
0xffffab0000026800 0001 00000000                0x0                0x0
0xffffab0000026880 0001 00000000                0x0                0x0
0xffffab0000026900 0001 00000000                0x0                0x0
0xffffab0000026980 0001 00000000                0x0                0x0
0xffffab0000026a00 0001 00000000                0x0                0x0
0xffffab0000026a80 0001 00000000                0x0                0x0
0xffffab0000026b00 0001 00000000                0x0                0x0
0xffffab0000026b80 0001 00000000                0x0                0x0
0xffffab0000026c00 0001 00000000                0x0                0x0
0xffffab0000026c80 0001 00000000                0x0                0x0
0xffffab0000026d00 0001 00000000                0x0                0x0
0xffffab0000026d80 0001 00000000                0x0                0x0
0xffffab0000026e00 0001 00000000                0x0                0x0
0xffffab0000026e80 0001 00000000                0x0                0x0
0xffffab0000026f00 0001 00000000                0x0                0x0
0xffffab0000026f80 0001 00000000                0x0                0x0
0xffffab0000027000 0001 00000000                0x0                0x0
0xffffab0000027080 0001 00000000                0x0                0x0
0xffffab0000027100 0001 00000000                0x0                0x0
0xffffab0000027180 0001 00000000                0x0                0x0
0xffffab0000027200 0001 00000000                0x0                0x0
0xffffab0000027280 0001 00000000                0x0                0x0
0xffffab0000027300 0001 00000000                0x0                0x0
0xffffab0000027380 0001 00000000                0x0                0x0
0xffffab0000027400 0001 00000000                0x0                0x0
0xffffab0000027480 0001 00000000                0x0                0x0
0xffffab0000027500 0001 00000000                0x0                0x0
0xffffab0000027580 0001 00000000                0x0                0x0
0xffffab0000027600 0001 00000000                0x0                0x0
0xffffab0000027680 0001 00000000                0x0                0x0
0xffffab0000027700 0001 00000000                0x0                0x0
0xffffab0000027780 0001 00000000                0x0                0x0
0xffffab0000027800 0001 00000000                0x0                0x0
0xffffab0000027880 0001 00000000                0x0                0x0
0xffffab0000027900 0001 00000000                0x0                0x0
0xffffab0000027980 0001 00000000                0x0                0x0
0xffffab0000027a00 0001 00000000                0x0                0x0
0xffffab0000027a80 0001 00000000                0x0                0x0
0xffffab0000027b00 0001 00000000                0x0                0x0
0xffffab0000027b80 0001 00000000                0x0                0x0
0xffffab0000027c00 0001 00000000                0x0                0x0
0xffffab0000027c80 0001 00000000                0x0                0x0
0xffffab0000027d00 0001 00000000                0x0                0x0
0xffffab0000027d80 0001 00000000                0x0                0x0
0xffffab0000027e00 0001 00000000                0x0                0x0
0xffffab0000027e80 0001 00000000                0x0                0x0
0xffffab0000027f00 0001 00000000                0x0                0x0
0xffffab0000027f80 0001 00000000                0x0                0x0
0xffffab0000028000 0001 00000000                0x0                0x0
0xffffab0000028080 0001 00000000                0x0                0x0
0xffffab0000028100 0001 00000000                0x0                0x0
0xffffab0000028180 0001 00000000                0x0                0x0
0xffffab0000028200 0001 00000000                0x0                0x0
0xffffab0000028280 0001 00000000                0x0                0x0
0xffffab0000028300 0001 00000000                0x0                0x0
0xffffab0000028380 0001 00000000                0x0                0x0
0xffffab0000028400 0001 00000000                0x0                0x0
0xffffab0000028480 0001 00000000                0x0                0x0
0xffffab0000028500 0001 00000000                0x0                0x0
0xffffab0000028580 0001 00000000                0x0                0x0
0xffffab0000028600 0001 00000000                0x0                0x0
0xffffab0000028680 0001 00000000                0x0                0x0
0xffffab0000028700 0001 00000000                0x0                0x0
0xffffab0000028780 0001 00000000                0x0                0x0
0xffffab0000028800 0001 00000000                0x0                0x0
0xffffab0000028880 0001 00000000                0x0                0x0
0xffffab0000028900 0001 00000000                0x0                0x0
0xffffab0000028980 0001 00000000                0x0                0x0
0xffffab0000028a00 0001 00000000                0x0                0x0
0xffffab0000028a80 0001 00000000                0x0                0x0
0xffffab0000028b00 0001 00000000                0x0                0x0
0xffffab0000028b80 0001 00000000                0x0                0x0
0xffffab0000028c00 0001 00000000                0x0                0x0
0xffffab0000028c80 0001 00000000                0x0                0x0
0xffffab0000028d00 0001 00000000                0x0                0x0
0xffffab0000028d80 0001 00000000                0x0                0x0
0xffffab0000028e00 0001 00000000                0x0                0x0
0xffffab0000028e80 0001 00000000                0x0                0x0
0xffffab0000028f00 0001 00000000                0x0                0x0
0xffffab0000028f80 0001 00000000                0x0                0x0
0xffffab0000029000 0001 00000000                0x0                0x0
0xffffab0000029080 0001 00000000                0x0                0x0
0xffffab0000029100 0001 00000000                0x0                0x0
0xffffab0000029180 0001 00000000                0x0                0x0
0xffffab0000029200 0001 00000000                0x0                0x0
0xffffab0000029280 0001 00000000                0x0                0x0
0xffffab0000029300 0001 00000000                0x0                0x0
0xffffab0000029380 0001 00000000                0x0                0x0
0xffffab0000029400 0001 00000000                0x0                0x0
0xffffab0000029480 0001 00000000                0x0                0x0
0xffffab0000029500 0001 00000000                0x0                0x0
0xffffab0000029580 0001 00000000                0x0                0x0
0xffffab0000029600 0001 00000000                0x0                0x0
0xffffab0000029680 0001 00000000                0x0                0x0
0xffffab0000029700 0001 00000000                0x0                0x0
0xffffab0000029780 0001 00000000                0x0                0x0
0xffffab0000029800 0001 00000000                0x0                0x0
0xffffab0000029880 0001 00000000                0x0                0x0
0xffffab0000029900 0001 00000000                0x0                0x0
0xffffab0000029980 0001 00000000                0x0                0x0
0xffffab0000029a00 0001 00000000                0x0                0x0
0xffffab0000029a80 0001 00000000                0x0                0x0
0xffffab0000029b00 0001 00000000                0x0                0x0
0xffffab0000029b80 0001 00000000                0x0                0x0
0xffffab0000029c00 0001 00000000                0x0                0x0
0xffffab0000029c80 0001 00000000                0x0                0x0
0xffffab0000029d00 0001 00000000                0x0                0x0
0xffffab0000029d80 0001 00000000                0x0                0x0
0xffffab0000029e00 0001 00000000                0x0                0x0
0xffffab0000029e80 0001 00000000                0x0                0x0
0xffffab0000029f00 0001 00000000                0x0                0x0
0xffffab0000029f80 0001 00000000                0x0                0x0
0xffffab000002a000 0001 00000000                0x0                0x0
0xffffab00000

Tested on:

commit:         f5f27c72 ldpd(8): Fix address of misaligned packed mem..
git tree:       https://github.com/NetBSD/src trunk
console output: https://syzkaller.appspot.com/x/log.txt?x=152d914c080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fab579639ba4bf0a
dashboard link: https://syzkaller.appspot.com/bug?extid=583ba2cdb8aa6e59a4bf
compiler:       g++ (Debian 10.2.1-6) 10.2.1 20210110
patch:          https://syzkaller.appspot.com/x/patch.diff?x=146388e0080000

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