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MSan: Uninitialized Memory in ttwrite



Hello,

syzbot found the following issue on:

HEAD commit:    6a422c285b19 fix typos in comments (s/adn/and/ and s/wan t..
git tree:       netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14d13c2e480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=739e57438eb9ed9e
dashboard link: https://syzkaller.appspot.com/bug?extid=2a5fb0c87d92d9d77361
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14e9a4fe480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12a689b9480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/002152d32adc/disk-6a422c28.raw.xz
netbsd.gdb: https://storage.googleapis.com/syzbot-assets/c98286f734f4/netbsd-6a422c28.gdb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2a5fb0c87d92d9d77361%syzkaller.appspotmail.com@localhost

[ 158.6933203] panic: MSan: Uninitialized Variable 'pi' From spec_open()

[ 158.7132761] cpu1: Begin traceback...
[ 158.7433099] vpanic() at netbsd:vpanic+0xc9d
[ 158.8232912] panic() at netbsd:panic+0x1b3 sys/kern/subr_prf.c:208
[ 158.9033096] __msan_warning() at netbsd:__msan_warning+0x11e kmsan_report_inline sys/kern/subr_msan.c:234 [inline]
[ 158.9033096] __msan_warning() at netbsd:__msan_warning+0x11e sys/kern/subr_msan.c:615
[ 158.9832903] db_nextframe() at netbsd:db_nextframe+0xd99 sys/arch/amd64/amd64/db_machdep.c:123
[ 159.0632911] db_stack_trace_print() at netbsd:db_stack_trace_print+0x1983 sys/arch/x86/x86/db_trace.c:278
[ 159.1532908] ipi_msg_cpu_handler() at netbsd:ipi_msg_cpu_handler+0x224 sys/kern/subr_ipi.c:347
[ 159.2432903] ipi_cpu_handler() at netbsd:ipi_cpu_handler+0x1dc sys/kern/subr_ipi.c:309
[ 159.3232976] x86_ipi_handler() at netbsd:x86_ipi_handler+0x180
[ 159.4033063] Xresume_lapic_ipi() at netbsd:Xresume_lapic_ipi+0x18
[ 159.4232961] --- interrupt ---
[ 159.4933011] __msan_metadata_ptr_for_load_4() at netbsd:__msan_metadata_ptr_for_load_4+0x9b sys/kern/subr_msan.c:577
[ 159.5732917] ttwrite() at netbsd:ttwrite+0x1559 sys/kern/tty.c:2309
[ 159.6532880] comwrite() at netbsd:comwrite+0x208 sys/dev/ic/com.c:1251
[ 159.7332908] cdev_write() at netbsd:cdev_write+0x36b sys/kern/subr_devsw.c:1507
[ 159.8132887] spec_write() at netbsd:spec_write+0x561
[ 159.8932905] VOP_WRITE() at netbsd:VOP_WRITE+0x374
[ 159.9832995] vn_write() at netbsd:vn_write+0x709
[ 160.0633120] dofilewrite() at netbsd:dofilewrite+0x360 sys/kern/sys_generic.c:352
[ 160.1432933] sys_pwrite() at netbsd:sys_pwrite+0x473 sys/kern/vfs_syscalls.c:3071
[ 160.2232973] sys_syscall() at netbsd:sys_syscall+0x2c5 sys/kern/sys_syscall.c:90
[ 160.3133015] syscall() at netbsd:syscall+0x60c sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 160.3133015] syscall() at netbsd:syscall+0x60c sys/arch/x86/x86/syscall.c:138
[ 160.3433022] --- syscall (number 174 via SYS_syscall) ---
[ 160.3732890] netbsd:syscall+0x60c:
[ 160.3732890] cpu1: End traceback...
[ 160.3832906] fatal breakpoint trap in supervisor mode
[ 160.3932776] trap type 1 code 0 rip 0xffffffff8023675d cs 0x8 rflags 0x286 cr2 0x7f7fff962b68 ilevel 0x8 rsp 0xffffe600c7819560
[ 160.4132785] curlwp 0xffffe60012bdf900 pid 830.830 lowest kstack 0xffffe600c78132c0
Stopped in pid 830.830 (syz-executor1908) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0xc9d
panic() at netbsd:panic+0x1b3 sys/kern/subr_prf.c:208
__msan_warning() at netbsd:__msan_warning+0x11e kmsan_report_inline sys/kern/subr_msan.c:234 [inline]
__msan_warning() at netbsd:__msan_warning+0x11e sys/kern/subr_msan.c:615
db_nextframe() at netbsd:db_nextframe+0xd99 sys/arch/amd64/amd64/db_machdep.c:123
db_stack_trace_print() at netbsd:db_stack_trace_print+0x1983 sys/arch/x86/x86/db_trace.c:278
ipi_msg_cpu_handler() at netbsd:ipi_msg_cpu_handler+0x224 sys/kern/subr_ipi.c:347
ipi_cpu_handler() at netbsd:ipi_cpu_handler+0x1dc sys/kern/subr_ipi.c:309
x86_ipi_handler() at netbsd:x86_ipi_handler+0x180
Xresume_lapic_ipi() at netbsd:Xresume_lapic_ipi+0x18
--- interrupt ---
__msan_metadata_ptr_for_load_4() at netbsd:__msan_metadata_ptr_for_load_4+0x9b sys/kern/subr_msan.c:577
ttwrite() at netbsd:ttwrite+0x1559 sys/kern/tty.c:2309
comwrite() at netbsd:comwrite+0x208 sys/dev/ic/com.c:1251
cdev_write() at netbsd:cdev_write+0x36b sys/kern/subr_devsw.c:1507
spec_write() at netbsd:spec_write+0x561
VOP_WRITE() at netbsd:VOP_WRITE+0x374
vn_write() at netbsd:vn_write+0x709
dofilewrite() at netbsd:dofilewrite+0x360 sys/kern/sys_generic.c:352
sys_pwrite() at netbsd:sys_pwrite+0x473 sys/kern/vfs_syscalls.c:3071
sys_syscall() at netbsd:sys_syscall+0x2c5 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 174 via SYS_syscall) ---
netbsd:syscall+0x60c:
Panic string: MSan: Uninitialized Variable 'pi' From spec_open()

PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
1382 >1382 7   0         0   ffffe60012c9e940   syz-executor1908
991    991 3   0         0   ffffe60013418100   syz-executor1908 vm_map
1242  1242 2   1     40000   ffffe60012c9e500   syz-executor1908
1256  1256 3   0     40000   ffffe60012c9e0c0   syz-executor1908 vm_map
830  > 830 7   1     40000   ffffe60012bdf900   syz-executor1908
1240  1240 3   0         0   ffffe60012bdf4c0   syz-executor1908 vm_map
801    801 2   1     40000   ffffe60012bdf080   syz-executor1908
449    449 2   1       140   ffffe600122f4b00   syz-executor1908
942    942 3   0     40180   ffffe600122f46c0   syz-executor1908 nanoslp
1238  1238 3   1       180   ffffe600123852c0               sshd select
1083  1083 2   1       140   ffffe60012bb08c0              getty
1226  1226 2   1       140   ffffe600121eeac0              getty
1225  1225 3   0       180   ffffe600122f4280              getty nanoslp
1224  1224 3   0       1c0   ffffe600121eb200              getty ttyraw
1107  1107 3   0       180   ffffe60012511300               sshd select
1095  1095 3   0       180   ffffe60012bb0480             powerd kqueue
701    701 3   0       180   ffffe600125d7780            syslogd kqueue
559    559 3   0       180   ffffe60012bb0040             dhcpcd poll
747    747 3   0       180   ffffe60012511b80             dhcpcd poll
745    745 3   1       180   ffffe600125d7bc0             dhcpcd poll
604    604 3   1       180   ffffe60012385700             dhcpcd poll
487    487 3   1       180   ffffe600125d7340             dhcpcd poll
292    292 3   1       180   ffffe60012385b40             dhcpcd poll
485    485 3   1       180   ffffe60012511740             dhcpcd poll
1        1 3   1       180   ffffe60011ecf100               init wait
0     1004 3   0       200   ffffe600121eb640            physiod physiod
0      196 3   1       200   ffffe600121ee680          pooldrain pooldrain
0      195 3   0       200   ffffe600121ee240            ioflush syncer
0      194 3   0       200   ffffe600121eba80           pgdaemon pgdaemon
0      167 2   1       240   ffffe6001215ba40               usb7
0      172 2   1       240   ffffe6001215b600               usb6
0      170 3   0       200   ffffe6001215b1c0               usb5 usbevt
0      168 3   0       200   ffffe6001212ca00               usb4 usbevt
0      166 3   0       200   ffffe6001212c5c0               usb3 usbevt
0      165 3   0       200   ffffe6001212c180               usb2 usbevt
0       31 3   0       200   ffffe600120769c0               usb1 usbevt
0       63 3   0       200   ffffe60012076580               usb0 usbevt
0      126 3   1       200   ffffe60012076140         usbtask-dr usbtsk
0      125 3   1       200   ffffe60011ecf980         usbtask-hc usbtsk
0      124 3   0       200   ffffe600103f5b00          swwreboot swwreboot
0      123 2   1       240   ffffe60011ecf540             npfgc0
0      122 3   1       200   ffffe60011ec1940            rt_free rt_free
0      121 3   1       200   ffffe60011ec1500              unpgc unpgc
0      120 3   0       200   ffffe60011ec10c0    key_timehandler key_timehandler
0      119 3   1       200   ffffe60011ebc900    icmp6_wqinput/1 icmp6_wqinput
0      118 3   0       200   ffffe60011ebc4c0    icmp6_wqinput/0 icmp6_wqinput
0      117 3   0       200   ffffe60011ebc080          nd6_timer nd6_timer
0      116 3   1       200   ffffe60011ce0bc0    carp6_wqinput/1 carp6_wqinput
0      115 3   0       200   ffffe60011ce0780    carp6_wqinput/0 carp6_wqinput
0      114 3   1       200   ffffe60011ce0340     carp_wqinput/1 carp_wqinput
0      113 3   0       200   ffffe60011e9b8c0     carp_wqinput/0 carp_wqinput
0      112 3   1       200   ffffe60011e9b480     icmp_wqinput/1 icmp_wqinput
0      111 3   0       200   ffffe60011cddb80     icmp_wqinput/0 icmp_wqinput
0      110 3   0       200   ffffe60011cdd740           rt_timer rt_timer
0      109 3   0       200   ffffe60011e9b040        vmem_rehash vmem_rehash
0      100 3   0       200   ffffe60011cdd300          entbutler entropy
0       99 2   0       240   ffffe600117e0b40              viomb
0       98 3   1       200   ffffe600117e0700      vioif0_txrx/1 vioif0_txrx
0       97 3   0       200   ffffe600117e02c0      vioif0_txrx/0 vioif0_txrx
0       30 3   0       200   ffffe600103f56c0           scsibus0 sccomp
0       29 3   0       200   ffffe600103f5280               pms0 pmsreset
0       28 3   1       200   ffffe600103daac0            xcall/1 xcall
0       27 1   1       200   ffffe600103da680          softser/1
0       26 1   1       200   ffffe600103da240          softclk/1
0       25 1   1       200   ffffe600103d8a80          softbio/1
0       24 1   1       200   ffffe600103d8640          softnet/1
0       23 1   1       201   ffffe600103d8200             idle/1
0       22 3   0       200   ffffe6000f1f4a40           lnxsyswq lnxsyswq
0       21 3   0       200   ffffe6000f1f4600           lnxubdwq lnxubdwq
0       20 3   0       200   ffffe6000f1f41c0           lnxpwrwq lnxpwrwq
0       19 3   0       200   ffffe6000f1f2a00           lnxlngwq lnxlngwq
0       18 3   0       200   ffffe6000f1f25c0           lnxhipwq lnxhipwq
0       17 3   0       200   ffffe6000f1f2180           lnxrcugc lnxrcugc
0       16 3   0       200   ffffe6000f1ec9c0             sysmon smtaskq
0       15 3   0       200   ffffe6000f1ec580         pmfsuspend pmfsuspend
0       14 3   0       200   ffffe6000f1ec140           pmfevent pmfevent
0       13 3   0       200   ffffe6000f1e9980         sopendfree sopendfr
0       12 3   0       200   ffffe6000f1e9540             ifwdog ifwdog
0       11 3   1       200   ffffe6000f1e9100            iflnkst iflnkst
0       10 3   0       200   ffffe6000f1df940           nfssilly nfssilly
0        9 3   0       200   ffffe6000f1df500             vdrain vdrain
0        8 3   1       200   ffffe6000f1df0c0          modunload mod_unld
0        7 3   0       200   ffffe6000ebdb900            xcall/0 xcall
0        6 1   0       200   ffffe6000ebdb4c0          softser/0
0    >   5 7   0       200   ffffe6000ebdb080          softclk/0
0        4 1   0       200   ffffe6000ebd98c0          softbio/0
0        3 1   0       200   ffffe6000ebd9480          softnet/0
0        2 1   0       201   ffffe6000ebd9040             idle/0
0        0 3   0       200   ffffffff86869600            swapper uvm
[Locks tracked through LWPs]

****** LWP 1382.1382 (syz-executor1908) @ 0xffffe60012c9e940, l_stat=7

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:pmap_ctor+0xc0 sys/arch/x86/x86/pmap.c:2860)
lock address : ffffe60012bdca80
type         : sleep/adaptive
initialized  : netbsd:pmap_ctor+0xc0
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  1
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe60012c9e940 last held: 000000000000000000
last locked  : netbsd:pmap_extract+0x130
unlocked*    : netbsd:pmap_extract+0x72d
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 991.991 (syz-executor1908) @ 0xffffe60013418100, l_stat=3

*** Locks held:

* Lock 0 (initialized at netbsd:lwp_ctl_alloc+0x3b9 sys/kern/kern_lwp.c:1859)
lock address : ffffe60013290e80
type         : sleep/adaptive
initialized  : netbsd:lwp_ctl_alloc+0x3b9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe60013418100 last held: 0xffffe60013418100
last locked* : netbsd:lwp_ctl_alloc+0x55f
unlocked     : 0
owner field  : 0xffffe60013418100 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1242.1242 (syz-executor1908) @ 0xffffe60012c9e500, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:lwp_ctl_alloc+0x3b9 sys/kern/kern_lwp.c:1859)
lock address : ffffe60013290e00
type         : sleep/adaptive
initialized  : netbsd:lwp_ctl_alloc+0x3b9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffe60012c9e500 last held: 0xffffe60012c9e500
last locked* : netbsd:lwp_ctl_alloc+0x55f
unlocked     : 0
owner field  : 0xffffe60012c9e500 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1256.1256 (syz-executor1908) @ 0xffffe60012c9e0c0, l_stat=3

*** Locks held:

* Lock 0 (initialized at netbsd:lwp_ctl_alloc+0x3b9 sys/kern/kern_lwp.c:1859)
lock address : ffffe60013290ec0
type         : sleep/adaptive
initialized  : netbsd:lwp_ctl_alloc+0x3b9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe60012c9e0c0 last held: 0xffffe60012c9e0c0
last locked* : netbsd:lwp_ctl_alloc+0x55f
unlocked     : 0
owner field  : 0xffffe60012c9e0c0 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1240.1240 (syz-executor1908) @ 0xffffe60012bdf4c0, l_stat=3

*** Locks held:

* Lock 0 (initialized at netbsd:lwp_ctl_alloc+0x3b9 sys/kern/kern_lwp.c:1859)
lock address : ffffe60013290f00
type         : sleep/adaptive
initialized  : netbsd:lwp_ctl_alloc+0x3b9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe60012bdf4c0 last held: 0xffffe60012bdf4c0
last locked* : netbsd:lwp_ctl_alloc+0x55f
unlocked     : 0
owner field  : 0xffffe60012bdf4c0 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 747.747 (dhcpcd) @ 0xffffe60012511b80, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe60012511b80 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 745.745 (dhcpcd) @ 0xffffe600125d7bc0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffe600125d7bc0 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 292.292 (dhcpcd) @ 0xffffe60012385b40, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffe60012385b40 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 485.485 (dhcpcd) @ 0xffffe60012511740, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffe60012511740 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffffe6000f1e9100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffe6000f1e9100 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.5 (softclk/0) @ 0xffffe6000ebdb080, l_stat=7

*** Locks held:

* Lock 0 (initialized at netbsd:soinit+0x4c2 sys/kern/uipc_socket.c:459)
lock address : ffffe6000ebc0080
type         : sleep/adaptive
initialized  : netbsd:soinit+0x4c2
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe6000ebdb080 last held: 0xffffe6000ebdb080
last locked* : netbsd:frag6_fasttimo+0x45
unlocked     : netbsd:ipintr+0x767c
owner field  : 0xffffe6000ebdb080 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffe6000ebdb080 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.0 (swapper) @ 0xffffffff86869600, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x43 sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x43
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffffff86869600 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
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 netbsd:main+0x354 sys/kern/init_main.c:303)
lock address : netbsd:kernel_lock
type         : spin
initialized  : netbsd:main+0x354
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffe60012bdf900 last held: 0xffffe60012bdf900
last locked* : netbsd:cdev_write+0x296
unlocked     : netbsd:cdev_open+0xadf
curcpu holds :                  1 wanted by: 000000000000000000

* Lock 1 (initialized at netbsd:kprintf_init+0xdc sys/kern/subr_prf.c:155)
lock address : netbsd:kprintf_mtx
type         : spin
initialized  : netbsd:kprintf_init+0xdc
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffe60012bdf900 last held: 0xffffe60012bdf900
last locked* : netbsd:vpanic+0x624
unlocked     : netbsd:printf+0x2ce
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffffe60000017180 0001 00000000                0x0                0x0
0xffffe60000017200 0041 00000000                0x0                0x0
0xffffe60000017280 0041 00000000                0x0                0x0
0xffffe60000017300 0041 00000000                0x0                0x0
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0xffffe60000029600 0001 00000000                0x0                0x0
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0xffffe60000029700 0001 00000000                0x0                0x0
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0xffffe60000029880 0001 00000000                0x0                0x0
0xffffe60000029900 0001 00000000                0x0                0x0
0xffffe60000029980 0001 00000000                0x0                0x0
0xffffe60000029a00 0001 00000000                0x0                0x0
0xffffe60000029a80 0001 00000000                0x0                0x0
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0xffffe60000029c00 0001 00000000                0x0                0x0
0xffffe60000029c80 0001 00000000                0x0                0x0
0xffffe60000029d00 0001 00000000                0x0                0x0
0xffffe60000029d80 0001 00000000                0x0                0x0
0xffffe60000029e00 0001 00000000                0x0                0x0
0xffffe60000029e80 0001 00000000                0x0                0x0
0xffffe60000029f00 0001 00000000                0x0                0x0
0xffffe60000029f80 0001 00000000                0x0                0x0
0xffffe6000002a000 0001 00000000                0x0                0x0
0xffffe6000002a080 0001 00000000                0x0                0x0
0xffffe6000002a100 0001 00000000                0x0                0x0
0xffffe6000002a180 0001 00000000                0x0                0x0
0xffffe6000002a200 0001 00000000                0x0                0x0
0xffffe6000002a280 0001 00000000                0x0                0x0
0xffffe6000002a300 0001 00000000                0x0                0x0
0xffffe6000002a380 0001 00000000                0x0                0x0
0xffffe6000002a400 0001 00000000                0x0                0x0
0xffffe6000002a480 0001 00000000                0x0                0x0
0xffffe6000002a500 0001 00000000                0x0                0x0
0xffffe6000002a580 0001 00000000                0x0                0x0
0xffffe6000002a600 0001 00000000                0x0                0x0
0xffffe6000002a680 0001 00000000                0x0                0x0
0xffffe6000002a700 0001 00000000                0x0                0x0
0xffffe6000002a780 0001 00000000                0x0                0x0
0xffffe6000002a800 0001 00000000                0x0                0x0
0xffffe6000002a880 0001 00000000                0x0                0x0
0xffffe6000002a900 0001 00000000                0x0                0x0
0xffffe6000002a980 0001 00000000                0x0                0x0
0xffffe6000002aa00 0001 00000000                0x0                0x0
0xffffe6000002aa80 0001 00000000                0x0                0x0
0xffffe6000002ab00 0001 00000000                0x0                0x0
0xffffe6000002ab80 0001 00000000                0x0                0x0
0xffffe6000002ac00 0001 00000000      

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller%googlegroups.com@localhost.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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