panic: kernel diagnostic assertion "pg->wiWrAeR_NcoIuNntG :!= S 0"P Lf aNiOlT eLdO:W fEiRElDe O"N/ sSyYSCzkALL a4l9 l0e rE/mXaInTa g0er as
/Stopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 89367 71763 32767 0x10 0x4000000 0 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x78dec033920, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu1: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x78dec033920, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80002efcef50
rbx 0
rdx 0xffff80000156e080
rcx 0xffff8000fffe7a10
rax 0x32
r8 0xffff80002efcee80
r9 0x3090713 __kernel_phys_base+0x2090713
r10 0xb293360c150b03c1
r11 0x6fa8438240acd0b6
r12 0
r13 0
r14 0xffff8000fffe7a10
r15 0
rip 0xffffffff82ec23ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff80002efceed0
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=89367 pid=71763 tcnt=4 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=32, usrpri=71, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffe6550,0xffff8000fffee028
process=0xffff80003b80f9e0 user=0xffff80002efc9000, vmspace=0xfffffd806c8f6400
estcpu=21, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
71763 501077 40507 32767 2 0x10 syz-executor
*71763 89367 40507 32767 7 0x4000010 syz-executor
71763 293586 40507 32767 2 0x4000010 syz-executor
71763 205064 40507 32767 3 0x4000090 fsleep syz-executor
30843 175018 85600 32767 3 0x90 piperd syz-executor
90667 245821 51674 32767 3 0x90 piperd syz-executor
25775 321585 17714 32767 3 0x90 nanoslp syz-executor
40507 245593 71142 32767 3 0x90 nanoslp syz-executor
80688 104130 88744 32767 3 0x90 piperd syz-executor
57034 475371 8019 32767 3 0x90 piperd syz-executor
59802 422377 4643 32767 3 0x90 wait syz-executor
51674 214738 67183 0 3 0x82 wait syz-executor
85600 257072 67183 0 3 0x82 wait syz-executor
88744 169851 67183 0 3 0x82 wait syz-executor
71142 389273 67183 0 3 0x82 wait syz-executor
17714 338194 67183 0 3 0x82 wait syz-executor
4643 386972 67183 0 3 0x82 wait syz-executor
8019 366239 67183 0 3 0x82 wait syz-executor
67183 207636 90649 0 3 0x82 nanoslp syz-executor
90649 82437 66531 0 3 0x10008a sigsusp ksh
66531 172169 49848 0 3 0x98 kqread sshd-session
49848 365502 94141 0 3 0x92 kqread sshd-session
37448 237201 1 0 3 0x100083 ttyin getty
94141 284268 1 0 3 0x88 kqread sshd
69089 369410 30828 73 3 0x1100090 kqread syslogd
30828 205390 1 0 3 0x100082 sbwait syslogd
61977 243299 1 0 3 0x100080 kqread resolvd
39291 354246 52295 77 3 0x100092 kqread dhcpleased
51359 117087 52295 77 3 0x100092 kqread dhcpleased
52295 242733 1 0 3 0x80 kqread dhcpleased
99605 276968 0 0 3 0x14200 bored smr
33595 241745 0 0 2 0x14200 zerothread
44003 37800 0 0 3 0x14200 aiodoned aiodoned
81986 240648 0 0 3 0x14200 syncer update
93478 316179 0 0 3 0x14200 cleaner cleaner
87246 401616 0 0 3 0x14200 reaper reaper
43334 24227 0 0 3 0x14200 pgdaemon pagedaemon
7039 248256 0 0 3 0x14200 bored viomb
82826 109135 0 0 3 0x40014200 acpi0 acpi0
11551 418691 0 0 3 0x40014200 idle1
99039 52404 0 0 3 0x14200 bored softnet1
50698 331255 0 0 3 0x14200 bored softnet0
49184 508027 0 0 3 0x14200 bored systqmp
85414 301094 0 0 3 0x14200 bored systq
59644 423357 0 0 3 0x14200 tmoslp softclockmp
98748 214204 0 0 3 0x40014200 tmoslp softclock
81452 451644 0 0 3 0x40014200 idle0
1 112775 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806cb21c10)
#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 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824
#3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863
#4 uvm_unmap_remove+0x6c2 sys/uvm/uvm_map.c:2002
#5 uvm_mapanon+0x55d sys/uvm/uvm_map.c:805
#6 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029
#7 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 71763 (syz-executor) thread 0xffff8000fffe7a10 (89367)
exclusive rwlock amaplk r = 0 (0xfffffd806c97e660)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 uvm_unmap_kill_entry_withlock+0xce uvm_map_lock_entry sys/uvm/uvm_map.c:464 [inline]
#2 uvm_unmap_kill_entry_withlock+0xce sys/uvm/uvm_map.c:1864
#3 uvm_unmap_remove+0x6c2 sys/uvm/uvm_map.c:2002
#4 uvm_mapanon+0x55d sys/uvm/uvm_map.c:805
#5 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029
#6 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426
#7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#8 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd806c8f6500)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5165
#3 uvm_mapanon+0x28f sys/uvm/uvm_map.c:-1
#4 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029
#5 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426
#6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#7 Xsyscall+0x128
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806cb21c10)
#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 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824
#3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863
#4 uvm_unmap_remove+0x6c2 sys/uvm/uvm_map.c:2002
#5 uvm_mapanon+0x55d sys/uvm/uvm_map.c:805
#6 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029
#7 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11085 12021K 12034K 166960K 12181 0
pcb 17 12K 12K 166960K 17 0
rtable 215 6K 7K 166960K 363 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 10 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 37 0
iov 0 0K 12K 166960K 16 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1335 84K 84K 166960K 1644 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 5K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 24 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 121K 166960K 484 0
sigio 0 0K 0K 166960K 10 0
proc 58 99K 147K 166960K 509 0
subproc 63 3K 4K 166960K 189 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 51 0
in_multi 88 6K 7K 166960K 113 0
ether_multi 1 0K 0K 166960K 5 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 289 1288K 1288K 166960K 289 0
exec 0 0K 1K 166960K 529 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 229 170K 193K 166960K 5874 0
UVM aobj 13 2K 2K 166960K 13 0
pinsyscall 39 78K 111K 166960K 1540 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 0K 166960K 25 0
NDP 10 0K 2K 166960K 27 0
temp 45 8681K 8745K 166960K 5293 0
kqueue 13 20K 30K 166960K 87 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> 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 64 0 61 1 0 1 1 0 8 0
rtentry 176 115 0 16 6 0 6 6 0 8 1
unpcb 144 251 0 234 1 0 1 1 0 8 0
syncache 336 7 0 7 1 1 0 1 0 8 0
tcpcb 736 183 0 178 2 1 1 2 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
ipq 40 4 0 1 1 0 1 1 0 8 0
ipqe 40 6 0 3 1 0 1 1 0 8 0
inpcb 328 613 0 604 10 4 6 10 0 8 5
ip6q 72 4 0 0 1 0 1 1 0 8 0
ip6af 40 4 0 0 1 0 1 1 0 8 0
nd6 152 28 0 7 2 0 2 2 0 8 1
kcovpl 48 21 0 14 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 477 0 69 30 2 28 30 0 8 1
art_table 40 478 0 69 5 0 5 5 0 8 0
art_node 32 115 0 25 1 0 1 1 0 8 0
sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 22 0 12 1 0 1 1 0 8 0
shmpl 112 10 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2142 0 622 96 0 96 96 0 8 0
ffsino 296 2142 0 622 118 0 118 118 0 8 0
nchpl 144 2746 0 1050 64 0 64 64 0 8 0
vnodes 216 2340 0 0 130 0 130 130 0 8 0
namei 1024 8849 0 8849 1 0 1 1 0 8 1
percpumem 16 50 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 8451 0 8451 7 4 3 6 1 8 3
plimitpl 152 214 0 189 2 1 1 2 0 8 0
sigapl 424 742 0 695 7 0 7 7 0 8 0
knotepl 120 581 0 0 18 0 18 18 0 8 0
kqueuepl 224 181 0 172 5 0 5 5 0 8 4
pipepl 344 217 0 190 6 0 6 6 0 8 3
fdescpl 528 726 0 696 3 0 3 3 0 8 0
filepl 160 4443 0 4245 17 1 16 17 0 8 6
lockfpl 104 206 0 204 2 0 2 2 0 8 1
lockfspl 48 28 0 26 1 0 1 1 0 8 0
sessionpl 144 37 0 22 1 0 1 1 0 8 0
pgrppl 48 73 0 51 1 0 1 1 0 8 0
ucredpl 104 1095 0 1077 1 0 1 1 0 8 0
zombiepl 144 697 0 695 1 0 1 1 0 8 0
processpl 1232 742 0 695 5 0 5 5 0 8 0
procpl 664 1244 0 1194 7 1 6 7 0 8 1
sosppl 176 8 0 8 1 1 0 1 0 8 0
sockpl 752 932 0 903 14 5 9 14 0 8 6
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 114 0 0 15 0 15 15 0 8 0
mcl2k 2048 22 0 0 3 0 3 3 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 245 0 0 17 1 16 16 0 8 0
bufpl 280 5258 0 118 368 0 368 368 0 8 0
anonpl 32 9687 0 0 79 0 79 79 0 246 0
amapchunkpl 152 19072 0 18290 38 5 33 36 0 158 2
amappl16 200 2946 0 2923 16 6 10 14 0 8 8
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 17 0 17 1 1 0 1 0 8 0
amappl13 176 400 0 399 1 0 1 1 0 8 0
amappl12 168 1061 0 1021 3 0 3 3 0 8 0
amappl11 160 3 0 3 1 1 0 1 0 8 0
amappl10 152 48 0 38 1 0 1 1 0 8 0
amappl9 144 244 0 244 1 1 0 1 0 8 0
amappl8 136 36 0 35 1 0 1 1 0 8 0
amappl7 128 71 0 70 1 0 1 1 0 8 0
amappl6 120 289 0 278 1 0 1 1 0 8 0
amappl5 112 79 0 71 1 0 1 1 0 8 0
amappl4 104 397 0 372 1 0 1 1 0 8 0
amappl3 96 3003 0 2916 3 0 3 3 0 8 0
amappl2 88 854 0 783 2 0 2 2 0 8 0
amappl1 80 10697 0 10159 14 0 14 14 0 8 0
amappl 88 5121 0 4962 5 0 5 5 0 92 0
uvmvnodes 80 110 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 128 253 0 253 1 1 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 12 0 0 1 0 1 1 0 8 0
uaddrrnd 24 726 0 695 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 726 0 695 1 0 1 1 0 8 0
vmmpekpl 168 7906 0 7866 3 0 3 3 0 8 0
vmmpepl 168 54154 0 52366 99 2 97 99 0 357 3
vmsppl 488 725 0 695 7 1 6 6 0 8 0
rwobjpl 80 17966 0 17038 25 0 25 25 0 8 2
pdppl 4096 1460 0 1390 114 32 82 96 0 8 12
pvpl 32 30501 0 0 246 0 246 246 0 265 0
pmappl 256 725 0 695 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 293 0 40 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x78dec033920, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299ddff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,73) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline]
comcnputc(800,73) at comcnputc+0xd0 sys/dev/ic/com.c:1259
cnputc(73) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(73) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386547) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aef3c) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833f0b63,ffffffff8334224d,4e2,ffffffff83342282) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageunwire(fffffd8008d62be0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249
uvm_fault_unwire_locked(fffffd806c8f6030,c34c5197000,c34c5596000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790
uvm_unmap_kill_entry_withlock(fffffd806c8f6030,fffffd806cb06d78,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860
end trace frame: 0xffff8000387e69b0, count: 0
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,73) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline]
comcnputc(800,73) at comcnputc+0xd0 sys/dev/ic/com.c:1259
cnputc(73) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(73) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386547) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aef3c) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833f0b63,ffffffff8334224d,4e2,ffffffff83342282) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageunwire(fffffd8008d62be0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249
uvm_fault_unwire_locked(fffffd806c8f6030,c34c5197000,c34c5596000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790
uvm_unmap_kill_entry_withlock(fffffd806c8f6030,fffffd806cb06d78,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860
uvm_map_teardown(fffffd806c8f6030) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline]
uvm_map_teardown(fffffd806c8f6030) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491
exit1(ffff8000fffef240,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000fffef240,ffff8000387e6b40,ffff8000387e6a90) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff8000387e6b40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000387e6b40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7c9bf611d280, count: -19