panic: kernel diagnostic assWeArRtNiIoNnG: S"pgP-L> wNiOreT_ cLoOWuERntED !O= N0 " SfYSaCiALlLe d1: 3f6il e1 53"1/0sy5z35k0a4l leErX/ImTana g0 e9r
s/Stopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 28474 15959 0 0x2 0 1 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x72ff5b420660, count: 14
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu0: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1207
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x72ff5b420660, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff80002a35cf30
rbx 0
rdx 0
rcx 0xffff8000fffeea78
rax 0x3c
r8 0xffff80002a35ce60
r9 0
r10 0xac269bb508cf7e30
r11 0x8c49c71786e764b8
r12 0
r13 0
r14 0xffff8000fffeea78
r15 0
rip 0xffffffff8270b3ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff80002a35ceb0
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=28474 pid=15959 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=17, usrpri=50, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffef240,0xffff8000fffef780
process=0xffff8000ffff5ce8 user=0xffff80002a357000, vmspace=0xfffff3006f3733d8
estcpu=36, cpticks=16, pctcpu=0.8, user=1, sys=14, intr=1
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
16028 495620 56742 0 2 0x2 syz-executor
52706 301052 31689 0 2 0 syz-executor
52706 422169 31689 0 3 0x4000080 fsleep syz-executor
27709 371992 95120 0 2 0 syz-executor
14235 416385 55807 0 2 0 syz-executor
14235 425807 55807 0 3 0x4000080 fsleep syz-executor
62122 305445 38613 0 2 0 syz-executor
62122 212442 38613 0 3 0x4000080 fsleep syz-executor
22046 400336 1 0 2 0 syz-executor
22046 427653 1 0 3 0x4000080 fifor syz-executor
22046 256709 1 0 3 0x4000080 fifor syz-executor
22046 518258 1 0 3 0x4000080 fifor syz-executor
22046 41693 1 0 3 0x4000080 fifor syz-executor
22046 9391 1 0 3 0x4000080 fsleep syz-executor
22046 93887 1 0 2 0x4000000 syz-executor
6723 107358 90962 0 2 0 syz-executor
6723 499311 90962 0 3 0x4000080 fsleep syz-executor
67819 199151 56742 0 2 0xc82 syz-executor
32666 27505 0 0 3 0x14200 acct acct
*15959 28474 56742 0 7 0x2 syz-executor
95120 344277 56742 0 2 0xc82 syz-executor
55807 287599 56742 0 2 0xc82 syz-executor
90962 350937 56742 0 2 0xc82 syz-executor
38613 366601 56742 0 2 0xc82 syz-executor
31689 361400 56742 0 2 0xc82 syz-executor
56742 475517 48403 0 3 0x82 kqread syz-executor
48403 179912 52303 0 3 0x10008a sigsusp ksh
52303 208956 14862 0 3 0x98 kqread sshd-session
14862 276653 27183 0 3 0x92 kqread sshd-session
69250 522892 1 0 3 0x100083 ttyin getty
27183 17546 1 0 3 0x88 kqread sshd
56569 200619 16234 74 3 0x1100092 bpf pflogd
16234 380099 1 0 3 0x80 sbwait pflogd
57311 114035 7355 73 3 0x1100090 kqread syslogd
7355 283836 1 0 3 0x100082 sbwait syslogd
25883 80547 1 0 3 0x100080 kqread resolvd
77492 407225 267 77 3 0x100092 kqread dhcpleased
54394 480307 267 77 3 0x100092 kqread dhcpleased
267 317167 1 0 3 0x80 kqread dhcpleased
98576 97367 0 0 3 0x14200 bored smr
2336 368657 0 0 2 0x14200 zerothread
52656 428314 0 0 3 0x14200 aiodoned aiodoned
34499 108449 0 0 3 0x14200 syncer update
20667 313358 0 0 3 0x14200 cleaner cleaner
2574 216331 0 0 3 0x14200 reaper reaper
77692 358593 0 0 3 0x14200 pgdaemon pagedaemon
79525 442704 0 0 3 0x14200 bored viomb
5113 500188 0 0 3 0x40014200 acpi0 acpi0
75731 284238 0 0 3 0x40014200 idle1
55582 184339 0 0 3 0x14200 bored softnet1
22886 326765 0 0 3 0x14200 bored softnet0
99923 68835 0 0 3 0x14200 bored systqmp
69025 495134 0 0 3 0x14200 bored systq
21367 332367 0 0 3 0x14200 tmoslp softclockmp
44866 168710 0 0 3 0x40014200 tmoslp softclock
13770 269093 0 0 3 0x40014200 idle0
1 386028 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex namei r = 0 (0xffffffff83a0c2e8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pool_get+0x124 sys/kern/subr_pool.c:585
#3 namei+0xdf sys/kern/vfs_lookup.c:145
#4 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047
#5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
Process 15959 (syz-executor) thread 0xffff8000fffeea78 (28474)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83ae20c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
exclusive mutex namei r = 0 (0xffffffff83a0c2e8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pool_get+0x124 sys/kern/subr_pool.c:585
#3 namei+0xdf sys/kern/vfs_lookup.c:145
#4 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047
#5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11070 12241K 12422K 166960K 12368 0
pcb 19 12K 12K 166960K 46 0
rtable 225 7K 9K 166960K 428 0
pf 34 17K 24K 166960K 88 0
ifaddr 39 6K 7K 166960K 55 0
ifgroup 51 2K 2K 166960K 67 0
sysctl 1 1K 9K 166960K 7 0
counters 68 36K 37K 166960K 86 0
ioctlops 0 0K 4K 166960K 1510 0
iov 0 0K 12K 166960K 11 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1370 86K 86K 166960K 1577 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 6 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 13 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 97K 166960K 305 0
sigio 0 0K 0K 166960K 3 0
proc 72 115K 180K 166960K 598 0
subproc 74 4K 5K 166960K 101 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 22 0
in_multi 88 6K 7K 166960K 113 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 6 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 421 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 243 169K 170K 166960K 4642 0
UVM aobj 9 2K 2K 166960K 9 0
pinsyscall 41 82K 105K 166960K 1527 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 3 0
NDP 11 0K 2K 166960K 35 0
temp 44 9111K 9175K 166960K 12399 0
kqueue 14 22K 26K 166960K 49 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 52 0 48 1 0 1 1 0 8 0
rtentry 176 122 0 23 6 0 6 6 0 8 0
unpcb 144 252 0 233 6 5 1 6 0 8 0
syncache 336 5 0 5 1 1 0 1 0 8 0
tcpcb 736 44 0 39 1 0 1 1 0 8 0
arp 136 20 0 4 1 0 1 1 0 8 0
inpcb 328 177 0 167 2 0 2 2 0 8 0
nd6 152 27 0 6 1 0 1 1 0 8 0
kcovpl 48 11 0 3 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 7 0 7 1 1 0 1 0 8 0
pfstscr 40 2 0 2 1 1 0 1 0 8 0
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 1 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfrktable 1344 8 0 8 1 1 0 1 0 8 0
pfanchor 1288 6 0 2 1 0 1 1 0 8 0
pftag 88 4 0 2 1 0 1 1 0 8 0
pfstitem 24 25 0 0 1 0 1 1 0 8 0
pfstkey 128 27 0 2 1 0 1 1 0 8 0
pfstate 448 26 0 1 3 0 3 3 0 8 0
pfrule 1360 24 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 497 0 88 29 3 26 29 0 8 0
art_table 40 498 0 88 5 0 5 5 0 8 0
art_node 32 122 0 32 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0
semapl 72 10 0 2 1 0 1 1 0 8 0
shmpl 112 6 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 1826 0 355 93 0 93 93 0 8 0
ffsino 296 1826 0 355 114 0 114 114 0 8 0
nchpl 144 2223 0 517 64 0 64 64 0 8 0
vnodes 216 2078 0 0 116 0 116 116 0 8 0
namei 1024 7258 0 7258 2 1 1 2 0 8 1
percpumem 16 58 0 9 1 0 1 1 0 8 0
pfiaddrpl 120 2 0 2 1 1 0 1 0 8 0
kstatmem 264 37 0 12 2 0 2 2 0 8 0
scsiplug 72 2 0 2 1 1 0 1 0 8 0
scxspl 216 7419 0 7419 3 2 1 2 1 8 1
plimitpl 152 50 0 31 1 0 1 1 0 8 0
sigapl 424 627 0 579 7 1 6 7 0 8 0
knotepl 120 378 0 0 12 0 12 12 0 8 0
kqueuepl 224 71 0 60 1 0 1 1 0 8 0
pipepl 344 145 0 117 3 0 3 3 0 8 0
fdescpl 528 610 0 580 3 0 3 3 0 8 0
filepl 160 2792 0 2567 15 5 10 15 0 8 0
lockfpl 104 89 0 86 1 0 1 1 0 8 0
lockfspl 48 42 0 39 1 0 1 1 0 8 0
sessionpl 144 70 0 61 1 0 1 1 0 8 0
pgrppl 48 87 0 69 1 0 1 1 0 8 0
ucredpl 104 253 0 240 1 0 1 1 0 8 0
zombiepl 144 580 0 579 2 1 1 1 0 8 0
processpl 1232 627 0 579 5 1 4 5 0 8 0
procpl 664 884 0 826 6 0 6 6 0 8 0
sosppl 176 3 0 3 1 1 0 1 0 8 0
sockpl 752 486 0 453 17 13 4 17 0 8 0
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 136 0 0 17 0 17 17 0 8 0
mcl2k 2048 27 0 0 4 0 4 4 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 171 0 0 11 0 11 11 0 8 0
bufpl 272 5156 0 106 337 0 337 337 0 8 0
anonpl 32 10382 0 0 84 0 84 84 0 246 0
amapchunkpl 152 14560 0 13793 45 11 34 34 0 158 2
amappl16 200 1724 0 1695 5 3 2 5 0 8 0
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 454 0 453 1 0 1 1 0 8 0
amappl13 176 142 0 130 1 0 1 1 0 8 0
amappl12 168 871 0 842 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 1 0 1 0 8 0
amappl10 152 101 0 86 1 0 1 1 0 8 0
amappl9 144 279 0 278 1 0 1 1 0 8 0
amappl8 136 107 0 104 1 0 1 1 0 8 0
amappl7 128 151 0 138 1 0 1 1 0 8 0
amappl6 120 168 0 165 1 0 1 1 0 8 0
amappl5 112 98 0 88 1 0 1 1 0 8 0
amappl4 104 303 0 282 1 0 1 1 0 8 0
amappl3 96 2535 0 2419 4 0 4 4 0 8 0
amappl2 88 681 0 618 2 0 2 2 0 8 0
amappl1 80 11264 0 10660 15 1 14 15 0 8 0
amappl 88 3834 0 3665 5 0 5 5 0 92 0
uvmvnodes 80 104 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 254 0 254 2 2 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 8 0 0 1 0 1 1 0 8 0
uaddrrnd 24 610 0 579 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 610 0 579 1 0 1 1 0 8 0
vmmpekpl 168 6963 0 6918 3 0 3 3 0 8 0
vmmpepl 168 47662 0 45738 90 2 88 88 0 357 0
vmsppl 488 609 0 579 5 0 5 5 0 8 0
rwobjpl 80 16503 0 15428 24 0 24 24 0 8 0
pdppl 4096 1227 0 1158 109 38 71 87 0 8 2
pvpl 32 30721 0 0 248 0 248 248 0 265 0
pmappl 256 609 0 579 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 623 0 47 17 0 17 17 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83985ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x194 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline]
acpitimer_delay(1) at acpitimer_delay+0x194 sys/dev/acpi/acpitimer.c:125
comcnputc(800,2f) at comcnputc+0x29b sys/dev/ic/com.c:1274
cnputc(2f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(2f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83497404) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff834be1e0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff834f943f,ffffffff834e8806,4b7,ffffffff8344a743) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageunwire(fffff300085c6bc8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206
uvm_fault_unwire_locked(fffff3006c4b0b90,6174ec87000,6174f086000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790
end trace frame: 0xffff800032785330, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff83985ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x194 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline]
acpitimer_delay(1) at acpitimer_delay+0x194 sys/dev/acpi/acpitimer.c:125
comcnputc(800,2f) at comcnputc+0x29b sys/dev/ic/com.c:1274
cnputc(2f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(2f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83497404) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff834be1e0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff834f943f,ffffffff834e8806,4b7,ffffffff8344a743) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageunwire(fffff300085c6bc8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206
uvm_fault_unwire_locked(fffff3006c4b0b90,6174ec87000,6174f086000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790
uvm_unmap_kill_entry_withlock(fffff3006c4b0b90,fffff3006c48e3b0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866
uvm_map_teardown(fffff3006c4b0b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline]
uvm_map_teardown(fffff3006c4b0b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497
exit1(ffff80003c3b8d18,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff80003c3b8d18,ffff800032785510,ffff800032785460) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800032785510) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800032785510) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70971a027d70, count: -20
ddb{0}> machine ddbcpu 1
Stopped at savectx+0xae: movl $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x72ff5b420660, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x72ff5b420660, count: -1