panic: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_map.c", line 3641
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*195311 82370 0 0x2 0 0 syz-executor2696
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824502ee) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824bffea,ffffffff824cd928,e39,ffffffff824ce6c6) at __assert+0x25 sys/kern/subr_prf.c:161
uvmspace_free(fffffd806edcaa18) at uvmspace_free+0xe4 sys/uvm/uvm_map.c:3641
vm_impl_init_vmx(ffff800021215c70,ffff8000ffff6550) at vm_impl_init_vmx+0x159
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b29800,1,ffff8000ffff6550) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806ecfc050,c5005601,ffff800000b29800,1,fffffd807f7d8660,ffff8000ffff6550) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e4a98f8,c5005601,ffff800000b29800,ffff8000ffff6550) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff6550,ffff800021228f18,ffff800021228f60) at sys_ioctl+0x4a2
syscall(ffff800021228fe0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021228fe0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe1d50, count: 3
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
*cpu0: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_map.c", line 3641
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824502ee) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824bffea,ffffffff824cd928,e39,ffffffff824ce6c6) at __assert+0x25 sys/kern/subr_prf.c:161
uvmspace_free(fffffd806edcaa18) at uvmspace_free+0xe4 sys/uvm/uvm_map.c:3641
vm_impl_init_vmx(ffff800021215c70,ffff8000ffff6550) at vm_impl_init_vmx+0x159
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b29800,1,ffff8000ffff6550) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806ecfc050,c5005601,ffff800000b29800,1,fffffd807f7d8660,ffff8000ffff6550) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e4a98f8,c5005601,ffff800000b29800,ffff8000ffff6550) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff6550,ffff800021228f18,ffff800021228f60) at sys_ioctl+0x4a2
syscall(ffff800021228fe0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021228fe0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe1d50, count: -12
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021228a10
rbx 0xffffffff8280abff cpu_info_full_primary+0x2bff
rdx 0x8b
rcx 0x2
rax 0x8a
r8 0xffffffff81a0be34 kprintf+0x144
r9 0x1
r10 0x35f160be9f34b416
r11 0x57f8c120b887bbed
r12 0xffffffff8280aa00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff81e3e908 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021228a00
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor2696) pid=195311 stat=onproc
flags process=2<EXEC> proc=0
pri=52, usrpri=53, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffffffff82913618
process=0xffff80002120b250 user=0xffff800021224000, vmspace=0xfffffd806edcacf8
estcpu=3, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*82370 195311 72488 0 7 0x2 syz-executor2696
72488 377100 601 0 3 0x10008a sigsusp ksh
601 313503 27811 0 3 0x9a select sshd
66319 126917 1 0 3 0x100083 ttyin getty
27811 316788 1 0 3 0x88 select sshd
32487 450221 97075 74 3 0x100092 bpf pflogd
97075 221379 1 0 3 0x80 netio pflogd
16794 378388 16187 73 3 0x100090 kqread syslogd
16187 384041 1 0 3 0x100082 netio syslogd
51644 140503 1 0 3 0x100080 kqread resolvd
5139 396449 25743 77 3 0x100092 kqread dhcpleased
90004 466574 25743 77 3 0x100092 kqread dhcpleased
25743 289663 1 0 3 0x80 kqread dhcpleased
21777 58429 0 0 3 0x14200 bored smr
64792 145971 0 0 3 0x14200 pgzero zerothread
11634 38687 0 0 3 0x14200 aiodoned aiodoned
25498 333544 0 0 3 0x14200 syncer update
55072 7069 0 0 3 0x14200 cleaner cleaner
59804 432368 0 0 3 0x14200 reaper reaper
89820 430452 0 0 3 0x14200 pgdaemon pagedaemon
23552 398103 0 0 3 0x14200 bored crynlk
94042 22466 0 0 3 0x14200 bored crypto
24644 170228 0 0 3 0x14200 bored viomb
32135 95644 0 0 3 0x40014200 acpi0 acpi0
16121 360757 0 0 7 0x40014200 idle1
79978 101924 0 0 3 0x14200 bored softnet
14933 99704 0 0 3 0x14200 bored systqmp
5959 244560 0 0 3 0x14200 bored systq
70466 185417 0 0 3 0x40014200 bored softclock
96045 478917 0 0 3 0x40014200 idle0
1 39561 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 82370 (syz-executor2696) thread 0xffff8000ffff6550 (195311)
exclusive rwlock vmlistlock r = 0 (0xffff800000655c78)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vm_create+0x12e vm_impl_init sys/arch/amd64/amd64/vmm.c:1688 [inline]
#1 vm_create+0x12e sys/arch/amd64/amd64/vmm.c:1510
#2 vmmioctl+0x1f2
#3 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#4 vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#5 sys_ioctl+0x4a2
#6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#7 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10111 6416K 6417K 78643K 11201 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 112 0
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 1 2K 4K 78643K 1480 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1183 74K 75K 78643K 1188 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 1 0K 0K 78643K 1 0
proc 67 87K 87K 78643K 278 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 19 95K 95K 78643K 19 0
exec 0 0K 2K 78643K 348 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 82 3K 6K 78643K 1728 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 4 0K 0K 78643K 4 0
temp 23 4193K 4257K 78643K 1962 0
kqueue 9 12K 12K 78643K 9 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 17 0 14 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 35 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 1 0 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 32 0 26 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
pfstitem 24 8 0 0 1 0 1 1 0 8 0
pfstkey 112 8 0 0 1 0 1 1 0 8 0
pfstate 320 8 0 0 1 0 1 1 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 96 0 0 6 0 6 6 0 8 0
art_table 32 97 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1413 0 23 87 0 87 87 0 8 0
ffsino 272 1413 0 23 93 0 93 93 0 8 0
nchpl 144 1588 0 40 58 0 58 58 0 8 0
uvmvnodes 72 1423 0 0 26 0 26 26 0 8 0
vnodes 224 1423 0 0 84 0 84 84 0 8 0
namei 1024 4147 0 4147 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
vmpool 560 1 0 0 1 0 1 1 0 8 0
scxspl 216 3479 0 3479 2 1 1 2 0 8 1
plimitpl 152 16 0 9 1 0 1 1 0 8 0
sigapl 424 255 0 224 4 0 4 4 0 8 0
knotepl 112 24 0 0 1 0 1 1 0 8 0
kqueuepl 216 5 0 0 1 0 1 1 0 8 0
pipepl 336 69 0 66 1 0 1 1 0 8 0
fdescpl 496 239 0 224 3 0 3 3 0 8 0
filepl 152 1085 0 1026 3 0 3 3 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 18 0 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 69 0 57 1 0 1 1 0 8 0
zombiepl 144 224 0 224 1 0 1 1 0 8 1
processpl 1072 255 0 224 3 0 3 3 0 8 0
procpl 672 255 0 224 3 0 3 3 0 8 0
sockpl 480 84 0 60 4 0 4 4 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 56 0 0 7 0 7 7 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 104 0 0 7 0 7 7 0 8 0
bufpl 280 2010 0 90 138 0 138 138 0 8 0
anonpl 24 32861 0 30555 17 2 15 17 0 186 1
amapchunkpl 152 3049 0 2905 8 2 6 8 0 158 0
amappl16 200 95 0 91 1 0 1 1 0 8 0
amappl13 176 18 0 17 1 0 1 1 0 8 0
amappl12 168 17 0 17 1 0 1 1 0 8 1
amappl11 160 55 0 41 1 0 1 1 0 8 0
amappl10 152 26 0 22 1 0 1 1 0 8 0
amappl9 144 221 0 219 1 0 1 1 0 8 0
amappl8 136 275 0 275 1 0 1 1 0 8 1
amappl7 128 52 0 45 1 0 1 1 0 8 0
amappl6 120 86 0 81 1 0 1 1 0 8 0
amappl5 112 173 0 156 1 0 1 1 0 8 0
amappl4 104 529 0 506 1 0 1 1 0 8 0
amappl3 96 48 0 44 1 0 1 1 0 8 0
amappl2 88 400 0 354 2 0 2 2 0 8 0
amappl1 80 7569 0 7191 9 0 9 9 0 8 0
amappl 88 1485 0 1418 2 0 2 2 0 92 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 64 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 240 0 224 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 240 0 224 1 0 1 1 0 8 0
vmmpekpl 168 6035 0 6019 1 0 1 1 0 8 0
vmmpepl 168 22457 0 21609 41 0 41 41 0 357 1
vmsppl 368 239 0 224 2 0 2 2 0 8 0
rwobjpl 56 7021 0 6464 9 0 9 9 0 8 1
pdppl 4096 488 0 448 52 12 40 44 0 8 0
pvpl 32 112189 0 107982 38 0 38 38 0 265 1
pmappl 224 239 0 224 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 268 0 15 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824502ee) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824bffea,ffffffff824cd928,e39,ffffffff824ce6c6) at __assert+0x25 sys/kern/subr_prf.c:161
uvmspace_free(fffffd806edcaa18) at uvmspace_free+0xe4 sys/uvm/uvm_map.c:3641
vm_impl_init_vmx(ffff800021215c70,ffff8000ffff6550) at vm_impl_init_vmx+0x159
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b29800,ffff8000ffff6550) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b29800,1,ffff8000ffff6550) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806ecfc050,c5005601,ffff800000b29800,1,fffffd807f7d8660,ffff8000ffff6550) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e4a98f8,c5005601,ffff800000b29800,ffff8000ffff6550) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff6550,ffff800021228f18,ffff800021228f60) at sys_ioctl+0x4a2
syscall(ffff800021228fe0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021228fe0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe1d50, count: -12
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5
ddb{1}>