login: panic: amap_add: slot in use
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
205601 6471 0 0 0 1 syz-executor1
*205861 6471 0 0 0x4000000 0K syz-executor1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
amap_add(5a483116904d9159,fffffd807b937b40,fffffd8007496c60,ffff800020c950a8) at amap_add+0x1a6 sys/uvm/uvm_amap.c:1120
uvm_fault(6138c41a5cd3e1b7,ffff800020b93788,0,ffffffff81c0b080) at uvm_fault+0x1986 sys/uvm/uvm_fault.c:1194
pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200
kerntrap(c40b535ab089edf7) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294
alltraps_kern(6,4,2,0,fffffd8067660ad0,ffff800020b93788) at alltraps_kern+0x7b
copyin(a3631a9d4003a848,0,ffff800020b93788,d6012527758,0,760) at copyin+0x56
syscall(2fc432059b12c8a1) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(2fc432059b12c8a1) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,ffffffffffffff43,0,5,d5e0f7fa1a0) at Xsyscall+0x128
end of kernel
end trace frame: 0xd60125277e0, count: 5
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> show panic
amap_add: slot in use
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
amap_add(5a483116904d9159,fffffd807b937b40,fffffd8007496c60,ffff800020c950a8) at amap_add+0x1a6 sys/uvm/uvm_amap.c:1120
uvm_fault(6138c41a5cd3e1b7,ffff800020b93788,0,ffffffff81c0b080) at uvm_fault+0x1986 sys/uvm/uvm_fault.c:1194
pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200
kerntrap(c40b535ab089edf7) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294
alltraps_kern(6,4,2,0,fffffd8067660ad0,ffff800020b93788) at alltraps_kern+0x7b
copyin(a3631a9d4003a848,0,ffff800020b93788,d6012527758,0,760) at copyin+0x56
syscall(2fc432059b12c8a1) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(2fc432059b12c8a1) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,ffffffffffffff43,0,5,d5e0f7fa1a0) at Xsyscall+0x128
end of kernel
end trace frame: 0xd60125277e0, count: -10
ddb{0}> show registers
rdi 0xffffffff8135b537 db_enter+0x17
rsi 0x12e8 __ALIGN_SIZE+0x2e8
rbp 0xffff800020c94f00
rbx 0xffff800020c94fa0
rdx 0x12e9 __ALIGN_SIZE+0x2e9
rcx 0xffff800002f4a000
rax 0xffff800002f4a000
r8 0xffffffff81b488b4 kprintf+0x174
r9 0x1
r10 0x19fff0ab494856f0
r11 0xf765a344247cc5f4
r12 0x3000000008
r13 0xffff800020c94f10
r14 0x100
r15 0x1
rip 0xffffffff8135b538 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c94ef0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor1) pid=205861 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=4, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800020b939e0,0xffff800020b92730
process=0xffff800020b95a50 user=0xffff800020c90000, vmspace=0xfffffd807f00db40
estcpu=34, cpticks=1, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
86960 186504 64208 0 2 0 syz-executor0
6471 205601 28147 0 7 0 syz-executor1
6471 492003 28147 0 2 0x4000000 syz-executor1
6471 315513 28147 0 2 0x4000000 syz-executor1
* 6471 205861 28147 0 7 0x4000000 syz-executor1
66099 512093 0 0 3 0x14200 bored sosplice
28147 484845 16230 0 3 0x82 nanosleep syz-executor1
64208 153679 16230 0 2 0x2 syz-executor0
16230 141770 48875 0 3 0x82 thrsleep syz-fuzzer
16230 212386 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 452970 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 190024 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 111020 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 179649 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 170477 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 238000 48875 0 3 0x4000082 thrsleep syz-fuzzer
16230 227308 48875 0 3 0x4000082 kqread syz-fuzzer
16230 364276 48875 0 3 0x4000082 thrsleep syz-fuzzer
48875 488784 10229 0 3 0x10008a pause ksh
10229 428857 79326 0 3 0x92 select sshd
11195 270608 1 0 3 0x100083 ttyin getty
79326 319354 1 0 3 0x80 select sshd
44189 301887 12475 73 3 0x100090 kqread syslogd
12475 222181 1 0 3 0x100082 netio syslogd
87814 460579 1 77 3 0x100090 poll dhclient
44785 135698 1 0 3 0x80 poll dhclient
27078 253598 0 0 3 0x14200 pgzero zerothread
51677 402240 0 0 3 0x14200 aiodoned aiodoned
13605 170487 0 0 3 0x14200 syncer update
66880 302175 0 0 3 0x14200 cleaner cleaner
78217 234118 0 0 3 0x14200 reaper reaper
11329 412078 0 0 3 0x14200 pgdaemon pagedaemon
45432 74622 0 0 3 0x14200 bored crynlk
27382 377755 0 0 3 0x14200 bored crypto
6324 322675 0 0 3 0x40014200 acpi0 acpi0
37464 464229 0 0 3 0x40014200 idle1
55255 67548 0 0 3 0x14200 bored softnet
90837 393279 0 0 3 0x14200 bored systqmp
75690 223915 0 0 3 0x14200 bored systq
60951 448131 0 0 3 0x40014200 bored softclock
44217 441380 0 0 3 0x40014200 idle0
1 511343 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 6471 (syz-executor1) thread 0xffff800020b93788 (205861)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff822d88a8) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9457 6328K 6331K 78643K 10565 0 0
pcb 23 9K 9K 78643K 63 0 0
rtable 100 3K 4K 78643K 188 0 0
ifaddr 35 10K 10K 78643K 47 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 15 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1197 75K 75K 78643K 1244 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 3 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
file desc 6 17K 25K 78643K 65 0 0
proc 41 38K 70K 78643K 250 0 0
subproc 64 65538K 67586K 78643K 68 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 9 0 0
in_multi 33 2K 2K 78643K 40 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 42 185K 185K 78643K 42 0 0
exec 0 0K 1K 78643K 166 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 80 20K 20K 78643K 918 0 0
UVM aobj 6 2K 2K 78643K 6 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 5 0K 0K 78643K 12 0 0
temp 81 2352K 2420K 78643K 2867 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 4 0 0 1 0 1 1 0 8 0
inpcbpl 280 54 0 45 1 0 1 1 0 8 0
plimitpl 152 14 0 7 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 41 0 1 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpcb 544 20 0 14 1 0 1 1 0 8 0
nd6 48 4 0 0 1 0 1 1 0 8 0
ppxss 1128 2 0 2 1 0 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 185 0 0 12 0 12 12 0 8 0
art_table 32 186 0 0 2 0 2 2 0 8 0
art_node 16 40 0 6 1 0 1 1 0 8 0
shmpl 112 4 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1499 0 115 45 0 45 45 0 8 0
ffsino 272 1499 0 115 93 0 93 93 0 8 0
nchpl 144 1767 0 183 59 0 59 59 0 8 0
uvmvnodes 72 1545 0 0 29 0 29 29 0 8 0
vnodes 200 1545 0 0 82 0 82 82 0 8 0
namei 1024 3997 0 3997 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 4173 0 4173 8 5 3 7 0 8 3
sigapl 432 232 0 218 2 0 2 2 0 8 0
futexpl 56 596 0 596 1 0 1 1 0 8 1
knotepl 112 82 0 55 2 0 2 2 0 8 1
kqueuepl 104 22 0 20 1 0 1 1 0 8 0
pipepl 112 170 0 151 3 1 2 2 0 8 1
fdescpl 488 233 0 218 3 0 3 3 0 8 1
filepl 152 1230 0 1132 6 1 5 5 0 8 1
lockfpl 104 18 0 18 2 1 1 1 0 8 1
lockfspl 32 26 0 26 2 1 1 1 0 8 1
sessionpl 112 17 0 7 1 0 1 1 0 8 0
pgrppl 48 17 0 7 1 0 1 1 0 8 0
ucredpl 96 146 0 139 1 0 1 1 0 8 0
zombiepl 144 218 0 218 2 1 1 1 0 8 1
processpl 840 248 0 218 4 0 4 4 0 8 0
procpl 600 357 0 315 4 0 4 4 0 8 0
sosppl 128 4 0 4 1 0 1 1 0 8 1
sockpl 384 102 0 83 3 0 3 3 0 8 1
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 120 0 0 14 0 14 14 0 8 0
mtagpl 80 2 0 0 1 0 1 1 0 8 0
mbufpl 256 135 0 0 8 0 8 8 0 8 0
bufpl 256 5115 0 965 260 0 260 260 0 8 0
anonpl 16 28880 0 22141 29 1 28 28 0 125 0
amapchunkpl 152 982 0 891 6 0 6 6 0 158 2
amappl16 192 659 0 317 18 0 18 18 0 8 0
amappl15 184 1 0 0 1 0 1 1 0 8 0
amappl14 176 26 0 24 3 2 1 1 0 8 0
amappl13 168 19 0 16 1 0 1 1 0 8 0
amappl12 160 44 0 40 1 0 1 1 0 8 0
amappl11 152 187 0 177 1 0 1 1 0 8 0
amappl10 144 60 0 57 2 1 1 1 0 8 0
amappl9 136 342 0 340 1 0 1 1 0 8 0
amappl8 128 157 0 138 1 0 1 1 0 8 0
amappl7 120 34 0 28 1 0 1 1 0 8 0
amappl6 112 75 0 65 1 0 1 1 0 8 0
amappl5 104 116 0 106 1 0 1 1 0 8 0
amappl4 96 274 0 252 2 1 1 2 0 8 0
amappl3 88 127 0 120 1 0 1 1 0 8 0
amappl2 80 1052 0 1002 2 0 2 2 0 8 0
amappl1 72 13459 0 13032 24 9 15 19 0 8 5
amappl 72 566 0 531 1 0 1 1 0 75 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma64 64 259 0 259 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 17 0 17 1 1 0 1 0 8 0
aobjpl 64 5 0 0 1 0 1 1 0 8 0
uaddrrnd 24 233 0 218 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 233 0 218 1 0 1 1 0 8 0
vmmpekpl 168 5639 0 5616 2 0 2 2 0 8 0
vmmpepl 168 31236 0 29903 81 13 68 71 0 357 10
vmsppl 360 232 0 218 2 0 2 2 0 8 0
pdppl 4096 473 0 436 6 0 6 6 0 8 1
pvpl 32 109928 0 100234 98 6 92 95 0 265 13
pmappl 224 232 0 218 1 0 1 1 0 8 0
extentpl 40 39 0 25 1 0 1 1 0 8 0
phpool 112 403 0 3 12 0 12 12 0 8 0