panic: vop_genericp_abnaidoc:p
kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 685
Stopped at db_enter+0x1c: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 12962 69446 32767 0x10 0 1 syz-executor.1
11313 4130 32767 0x10 0 0 syz-executor.4
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827ad7da) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff828285c5,ffffffff827ea631,2ad,ffffffff827e16c2) at __assert+0x29 sys/kern/subr_prf.c:157
proc_trampoline_mi() at proc_trampoline_mi+0x221
end trace frame: 0x0, count: 11
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: vop_generic_badop
cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 685
ddb{1}> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827ad7da) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff828285c5,ffffffff827ea631,2ad,ffffffff827e16c2) at __assert+0x29 sys/kern/subr_prf.c:157
proc_trampoline_mi() at proc_trampoline_mi+0x221
end trace frame: 0x0, count: -4
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002128b3f0
rbx 0xffff800020d59ba7
rdx 0
rcx 0xffff80002126b010
rax 0xffff800020d58ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x53df6b184336e01b
r11 0xfadc944553cded4d
r12 0xffff800020d599a8
r13 0
r14 0xffffffff82bfb9a8 cpu_info_full_primary+0x29a8
r15 0x1
rip 0xffffffff824bb20c db_enter+0x1c
cs 0x8
rflags 0x246
rsp 0xffff80002128b3e0
ss 0x10
db_enter+0x1c: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) tid=12962 pid=69446 tcnt=1 stat=onproc
flags process=10<SUGID> proc=0
runpri=86, usrpri=86, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff8000246fa7f8,0xffffffff82c76ad0
process=0xffff8000ffff8868 user=0xffff800021286000, vmspace=0xfffffd806bd1b3b8
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*69446 12962 30746 32767 7 0x10 syz-executor.1
54077 77278 26952 32767 2 0x10 syz-executor.7
54077 90744 26952 32767 3 0x4000090 fsleep syz-executor.7
64719 130382 95809 32767 3 0x90 nanoslp syz-executor.5
64719 417504 95809 32767 2 0x4000010 syz-executor.5
98361 196852 79456 32767 3 0x90 nanoslp syz-executor.3
98361 521018 79456 32767 3 0x4000090 netio syz-executor.3
98361 169457 79456 32767 3 0x4000090 fsleep syz-executor.3
79456 141704 2713 32767 3 0x90 nanoslp syz-executor.3
2713 250157 18750 0 3 0x82 wait syz-executor.3
4130 11313 99494 32767 7 0x10 syz-executor.4
99494 227210 18750 0 3 0x82 wait syz-executor.4
62322 101240 37104 32767 2 0x10 syz-executor.2
37104 172298 18750 0 3 0x82 wait syz-executor.2
30746 192141 48659 32767 3 0x90 nanoslp syz-executor.1
53285 272599 92162 32767 2 0x10 syz-executor.0
92162 313648 18750 0 3 0x82 wait syz-executor.0
48659 178284 18750 0 3 0x82 wait syz-executor.1
61681 484196 76183 32767 3 0x90 nanoslp syz-executor.6
76183 140640 18750 0 3 0x82 wait syz-executor.6
95809 175417 31499 32767 3 0x90 nanoslp syz-executor.5
31499 344939 18750 0 3 0x82 wait syz-executor.5
26952 453396 8664 32767 3 0x90 nanoslp syz-executor.7
8664 328726 18750 0 3 0x82 wait syz-executor.7
75942 148973 0 0 3 0x14200 bored sosplice
18750 434715 54712 0 3 0x2000082 wait syz-fuzzer
18750 294192 54712 0 3 0x6000082 nanoslp syz-fuzzer
18750 257131 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 429666 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 97846 54712 0 3 0x6000082 wait syz-fuzzer
18750 155519 54712 0 3 0x6000082 wait syz-fuzzer
18750 93291 54712 0 3 0x6000082 kqread syz-fuzzer
18750 371198 54712 0 3 0x6000082 wait syz-fuzzer
18750 290102 54712 0 3 0x6000082 wait syz-fuzzer
18750 437291 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 358110 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 22409 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 395893 54712 0 3 0x6000082 thrsleep syz-fuzzer
18750 419389 54712 0 3 0x6000082 wait syz-fuzzer
18750 114923 54712 0 3 0x6000082 wait syz-fuzzer
18750 73937 54712 0 3 0x6000082 wait syz-fuzzer
54712 325617 2055 0 3 0x10008a sigsusp ksh
2055 109074 41200 0 3 0x9a kqread sshd
67496 241263 1 0 3 0x100083 ttyin getty
41200 179866 1 0 3 0x88 kqread sshd
92840 129202 41157 73 3 0x1100090 kqread syslogd
41157 167869 1 0 3 0x100082 netio syslogd
8395 384818 1 0 3 0x100080 kqread resolvd
96504 476223 47768 77 3 0x100092 kqread dhcpleased
65103 67758 47768 77 3 0x100092 kqread dhcpleased
47768 374798 1 0 3 0x80 kqread dhcpleased
10802 275467 0 0 3 0x14200 bored smr
63581 129622 0 0 2 0x14200 zerothread
22826 202710 0 0 3 0x14200 aiodoned aiodoned
91934 232232 0 0 3 0x14200 syncer update
53651 63433 0 0 3 0x14200 cleaner cleaner
99652 318274 0 0 3 0x14200 reaper reaper
32852 411056 0 0 3 0x14200 pgdaemon pagedaemon
79662 281065 0 0 3 0x14200 bored viomb
36823 182185 0 0 3 0x40014200 acpi0 acpi0
98601 227550 0 0 3 0x40014200 idle1
69726 390007 0 0 3 0x14200 bored softnet3
12150 462124 0 0 3 0x14200 bored softnet2
37495 399797 0 0 3 0x14200 bored softnet1
81290 359756 0 0 3 0x14200 bored softnet0
7571 377411 0 0 3 0x14200 bored systqmp
53589 47639 0 0 3 0x14200 bored systq
94204 276501 0 0 3 0x14200 tmoslp softclockmp
58883 158188 0 0 3 0x40014200 tmoslp softclock
33921 22616 0 0 3 0x40014200 idle0
1 40511 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 64719 (syz-executor.5) thread 0xffff8000211eb2b0 (417504)
shared rwlock vmmaplk r = 0 (0xfffffd806bd1bbf0)
#0 witness_lock+0x447
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1785
#2 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:672
#3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600
#4 kpageflttrap+0x252 sys/arch/amd64/amd64/trap.c:279
#5 kerntrap+0xf3 sys/arch/amd64/amd64/trap.c:332
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x57
#8 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#8 syscall+0x606 sys/arch/amd64/amd64/trap.c:623
#9 Xsyscall+0x128
Process 4130 (syz-executor.4) thread 0xffff80002957a558 (11313)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82c76098)
#0 witness_lock+0x447
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x46d sys/kern/sched_bsd.c:470
#3 sleep_finish+0x19b sys/kern/kern_synch.c:414
#4 biowait+0x91 sys/kern/vfs_bio.c:1278
#5 bwrite+0x21c sys/kern/vfs_bio.c:769
#6 ffs_update+0x281 sys/ufs/ffs/ffs_inode.c:113
#7 ufs_mkdir+0x672 sys/ufs/ufs/ufs_vnops.c:1219
#8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388
#9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073
#10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd8066db95f0)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vget+0x200 sys/kern/vfs_subr.c:676
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314
#8 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394
#9 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149
#10 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388
#11 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073
#12 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#12 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd8066db9b40)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418
#6 namei+0x55a sys/kern/vfs_lookup.c:250
#7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
#8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#9 Xsyscall+0x128
Process 62322 (syz-executor.2) thread 0xffff8000211eb800 (101240)
exclusive rrwlock inode r = 0 (0xfffffd8066db92c0)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vn_closefile+0xca vn_close sys/kern/vfs_vnops.c:292 [inline]
#5 vn_closefile+0xca sys/kern/vfs_vnops.c:609
#6 fdrop+0xcb sys/kern/kern_descrip.c:1274
#7 closef+0x120 sys/kern/kern_descrip.c:1258
#8 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#8 syscall+0x606 sys/arch/amd64/amd64/trap.c:623
#9 Xsyscall+0x128
Process 53285 (syz-executor.0) thread 0xffff80002957b2a0 (272599)
exclusive rrwlock inode r = 0 (0xfffffd8065ab9f80)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140
#5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343
#6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394
#7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149
#8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388
#9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073
#10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd8065ab95f0)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418
#6 namei+0x55a sys/kern/vfs_lookup.c:250
#7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
#8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10191 6409K 6420K 78643K 11413 0
pcb 13 16K 20K 78643K 19 0
rtable 244 6K 7K 78643K 2705 0
pf 29 8K 8K 78643K 125 0
ifaddr 44 15K 16K 78643K 242 0
ifgroup 50 2K 2K 78643K 242 0
sysctl 4 1K 1K 78643K 4 0
counters 60 35K 35K 78643K 156 0
ioctlops 0 0K 2K 78643K 267 0
iov 0 0K 24K 78643K 1944 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1279 80K 80K 78643K 3895 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 251 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 1308 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 22 81K 121K 78643K 18260 0
sigio 0 0K 0K 78643K 547 0
proc 56 78K 115K 78643K 2531 0
subproc 104 6K 6K 78643K 728 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 1112 0
in_multi 99 7K 7K 78643K 766 0
ether_multi 1 0K 0K 78643K 28 0
mrt 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 85 387K 387K 78643K 85 0
exec 0 0K 1K 78643K 2458 0
tdb 3 0K 0K 78643K 3 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 8 62K 64K 78643K 10 0
UVM amap 438 94K 109K 78643K 179887 0
UVM aobj 131 6K 6K 78643K 148 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 607 0
NDP 11 0K 2K 78643K 171 0
temp 74 5920K 6048K 78643K 48892 0
kqueue 13 20K 30K 78643K 1645 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> 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 1098 0 1095 13 12 1 3 0 8 0
rtentry 112 680 0 565 4 0 4 4 0 8 0
unpcb 144 13300 0 13285 130 124 6 8 0 8 5
syncache 304 265 0 265 33 32 1 1 0 8 1
tcpqe 32 312 0 312 27 27 0 1 0 8 0
tcpcb 808 28035 0 27999 263 249 14 20 0 8 6
arp 120 119 0 100 1 0 1 1 0 8 0
ipq 40 125 0 125 12 12 0 1 0 8 0
ipqe 40 479 0 479 12 12 0 1 0 8 0
inpcb 368 35729 0 35687 238 225 13 19 0 8 5
nd6 136 204 0 176 5 3 2 2 0 8 0
kcovpl 48 56 0 48 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2692 0 2226 36 6 30 31 0 8 0
art_table 32 2693 0 2226 4 0 4 4 0 8 0
art_node 16 679 0 574 1 0 1 1 0 8 0
sysvmsgpl 40 43 0 3 1 0 1 1 0 8 0
semupl 112 3 0 3 1 1 0 1 0 8 0
semapl 112 1304 0 1294 1 0 1 1 0 8 0
shmpl 112 145 0 17 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 23516 0 22064 92 0 92 92 0 8 0
ffsino 272 23516 0 22064 98 0 98 98 0 8 0
nchpl 144 47627 0 45986 63 0 63 63 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 148228 0 148226 3 2 1 2 0 8 0
percpumem 16 91 0 48 1 0 1 1 0 8 0
kstatmem 264 118 0 96 2 0 2 2 0 8 0
scxspl 216 156444 0 156444 67 64 3 8 1 8 3
plimitpl 152 3190 0 3166 23 22 1 2 0 8 0
sigapl 424 18462 0 18409 7 0 7 7 0 8 0
futexpl 64 181352 0 181350 2 1 1 1 0 8 0
knotepl 120 1135 0 0 18 0 18 18 0 8 0
kqueuepl 216 4300 0 4291 67 64 3 5 0 8 2
pipepl 320 4013 0 3985 102 96 6 9 0 8 3
fdescpl 496 18443 0 18410 7 2 5 6 0 8 0
filepl 152 131693 0 131451 211 196 15 20 0 8 2
lockfpl 104 2760 0 2758 3 2 1 2 0 8 0
lockfspl 48 776 0 774 1 0 1 1 0 8 0
sessionpl 144 71 0 55 1 0 1 1 0 8 0
pgrppl 48 357 0 341 1 0 1 1 0 8 0
ucredpl 104 12504 0 12486 1 0 1 1 0 8 0
zombiepl 144 18410 0 18409 1 0 1 1 0 8 0
processpl 1072 18462 0 18409 5 1 4 5 0 8 0
procpl 680 50884 0 50812 32 24 8 9 0 8 1
sosppl 168 334 0 331 17 16 1 1 0 8 0
sockpl 488 50896 0 50839 698 674 24 38 0 8 12
mcl64k 65536 42 0 0 4 1 3 3 0 8 0
mcl16k 16384 19 0 0 3 0 3 3 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 17 0 0 2 0 2 2 0 8 0
mcl8k 8192 25 0 0 3 0 3 3 0 8 0
mcl4k 4096 133 0 0 8 4 4 8 0 8 0
mcl2k2 2112 17 0 0 2 0 2 2 0 8 0
mcl2k 2048 470 0 0 32 17 15 32 0 8 0
mtagpl 96 15 0 0 1 0 1 1 0 8 0
mbufpl 256 3654 0 0 208 0 208 208 0 8 0
bufpl 288 35442 0 29120 452 0 452 452 0 8 0
anonpl 24 1809848 0 1798815 232 143 89 100 0 186 0
amapchunkpl 152 568337 0 567529 157 113 44 48 0 158 7
amappl16 200 37595 0 37263 201 182 19 34 0 8 0
amappl15 192 33 0 31 1 0 1 1 0 8 0
amappl14 184 288 0 277 2 1 1 2 0 8 0
amappl13 176 23 0 22 2 1 1 1 0 8 0
amappl12 168 19901 0 19861 3 1 2 3 0 8 0
amappl11 160 54 0 44 1 0 1 1 0 8 0
amappl10 152 82 0 70 1 0 1 1 0 8 0
amappl9 144 306 0 306 30 29 1 1 0 8 1
amappl8 136 1006 0 814 7 0 7 7 0 8 0
amappl7 128 359 0 333 2 0 2 2 0 8 0
amappl6 120 1132 0 1111 1 0 1 1 0 8 0
amappl5 112 482 0 474 1 0 1 1 0 8 0
amappl4 104 1050 0 1021 2 1 1 2 0 8 0
amappl3 96 111306 0 111219 16 12 4 4 0 8 1
amappl2 88 19736 0 19654 3 1 2 3 0 8 0
amappl1 80 75137 0 74616 22 10 12 22 0 8 0
amappl 88 178443 0 178205 8 1 7 7 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 72 147 0 17 3 0 3 3 0 8 0
uaddrrnd 24 18443 0 18410 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 18443 0 18410 1 0 1 1 0 8 0
vmmpekpl 168 141423 0 141360 4 0 4 4 0 8 0
vmmpepl 168 1088786 0 1086350 326 193 133 158 0 357 10
vmsppl 464 18442 0 18410 7 2 5 6 0 8 0
rwobjpl 56 269150 0 261631 133 25 108 111 0 8 0
pdppl 4096 36894 0 36820 706 624 82 94 0 8 8
pvpl 32 5313944 0 5296720 535 370 165 340 0 265 0
pmappl 248 18442 0 18410 4 1 3 3 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 2185 0 1154 30 0 30 30 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffffffff82bfaff0) at x86_ipi_db+0x1e 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+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc
softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x27
cnputc(a) at cnputc+0x4f sys/dev/cons.c:218
db_putchar(a) at db_putchar+0x4bd sys/ddb/db_output.c:168
kprintf() at kprintf+0x6bc sys/kern/subr_prf.c:724
db_printf(ffffffff8282fd50) at db_printf+0x89 sys/kern/subr_prf.c:498
panic(ffffffff8279ceb1) at panic+0xdb sys/kern/subr_prf.c:216
vop_generic_badop(ffff800027b657d8) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd8066486b20,fffffd80664b3da8) at VOP_STRATEGY+0x9f sys/kern/vfs_vops.c:628
bwrite(fffffd80664b3da8) at bwrite+0x1f1 sys/kern/vfs_bio.c:760
end trace frame: 0xffff800027b658c0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff82bfaff0) at x86_ipi_db+0x1e 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+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc
softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x27
cnputc(a) at cnputc+0x4f sys/dev/cons.c:218
db_putchar(a) at db_putchar+0x4bd sys/ddb/db_output.c:168
kprintf() at kprintf+0x6bc sys/kern/subr_prf.c:724
db_printf(ffffffff8282fd50) at db_printf+0x89 sys/kern/subr_prf.c:498
panic(ffffffff8279ceb1) at panic+0xdb sys/kern/subr_prf.c:216
vop_generic_badop(ffff800027b657d8) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd8066486b20,fffffd80664b3da8) at VOP_STRATEGY+0x9f sys/kern/vfs_vops.c:628
bwrite(fffffd80664b3da8) at bwrite+0x1f1 sys/kern/vfs_bio.c:760
VOP_BWRITE(fffffd80664b3da8) at VOP_BWRITE+0x4e sys/kern/vfs_vops.c:640
ufs_mkdir(ffff800027b65a70) at ufs_mkdir+0x6c4 sys/ufs/ufs/ufs_vnops.c:1235
VOP_MKDIR(fffffd80674c8058,ffff800027b65bd0,ffff800027b65c00,ffff800027b65b00) at VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388
domkdirat(ffff80002957a558,ffffff9c,7a6a1168aa50,1ff) at domkdirat+0x125 sys/kern/vfs_syscalls.c:3073
syscall(ffff800027b65d80) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff800027b65d80) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7a6a1168aac0, count: -20
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x1c: addq $0x8,%rsp
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827ad7da) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff828285c5,ffffffff827ea631,2ad,ffffffff827e16c2) at __assert+0x29 sys/kern/subr_prf.c:157
proc_trampoline_mi() at proc_trampoline_mi+0x221
end trace frame: 0x0, count: 11
ddb{1}> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827ad7da) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff828285c5,ffffffff827ea631,2ad,ffffffff827e16c2) at __assert+0x29 sys/kern/subr_prf.c:157
proc_trampoline_mi() at proc_trampoline_mi+0x221
end trace frame: 0x0, count: -4