panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/multicore/kernpanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 689
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*150149 72230 0 0 0x4000000 1 syz-executor.1
165198 7301 0 0 0x4000000 0 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x174 sys/kern/subr_prf.c:208
__assert(ffffffff81f7cec5,ffffffff81f6c058,2b1,ffffffff81f4ee5e) at __assert+0x2e sys/kern/subr_prf.c:155
proc_trampoline_mp() at proc_trampoline_mp+0x13b
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
kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 879
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x174 sys/kern/subr_prf.c:208
__assert(ffffffff81f7cec5,ffffffff81f6c058,2b1,ffffffff81f4ee5e) at __assert+0x2e sys/kern/subr_prf.c:155
proc_trampoline_mp() at proc_trampoline_mp+0x13b
end trace frame: 0x0, count: -4
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020c5f750
rbx 0xffff800020c5f800
rdx 0xffffffff81f8b3e6 apollo_pio_rec+0x9d5d
rcx 0
rax 0
r8 0xffffffff81b94ad3 kprintf+0x183
r9 0x1
r10 0x25
r11 0x7be823e6b0368fc6
r12 0x3000000008
r13 0xffff800020c5f760
r14 0x104
r15 0x1
rip 0xffffffff81d528d8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c5f740
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=150149 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020b28270,0xffffffff82377160
process=0xffff800020aeb3b8 user=0xffff800020c5a000, vmspace=0xfffffd807effe168
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
72230 2108 15381 0 2 0 syz-executor.1
72230 15162 15381 0 3 0x4000080 msgwait syz-executor.1
*72230 150149 15381 0 7 0x4000000 syz-executor.1
7301 265216 43166 0 2 0 syz-executor.0
7301 122368 43166 0 2 0x4000000 syz-executor.0
7301 165198 43166 0 7 0x4000000 syz-executor.0
7301 483078 43166 0 3 0x4000000 inode syz-executor.0
15381 225051 77186 0 3 0x82 nanosleep syz-executor.1
22670 335060 1 0 3 0x100083 ttyin getty
43166 199467 77186 0 2 0x2 syz-executor.0
54249 483943 0 0 3 0x14200 bored sosplice
77186 15166 60825 0 3 0x82 kqread syz-fuzzer
77186 89602 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 67070 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 163118 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 445613 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 354813 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 54760 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 405993 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 415919 60825 0 3 0x4000082 thrsleep syz-fuzzer
77186 196287 60825 0 3 0x4000082 thrsleep syz-fuzzer
60825 288477 94592 0 3 0x10008a pause ksh
94592 182759 34648 0 3 0x92 select sshd
34648 112243 1 0 3 0x80 select sshd
18136 358788 47588 74 3 0x100092 bpf pflogd
47588 269556 1 0 3 0x80 netio pflogd
63801 338353 28901 73 3 0x100090 kqread syslogd
28901 364564 1 0 3 0x100082 netio syslogd
45375 327906 1 77 3 0x100090 poll dhclient
45056 156803 1 0 3 0x80 poll dhclient
31637 18382 0 0 2 0x14200 zerothread
66142 224550 0 0 3 0x14200 aiodoned aiodoned
13342 188301 0 0 3 0x14200 syncer update
89729 188596 0 0 3 0x14200 cleaner cleaner
17404 69151 0 0 3 0x14200 reaper reaper
71438 433640 0 0 3 0x14200 pgdaemon pagedaemon
38017 102965 0 0 3 0x14200 bored crynlk
11555 357868 0 0 3 0x14200 bored crypto
6855 128339 0 0 3 0x40014200 acpi0 acpi0
34217 326135 0 0 3 0x40014200 idle1
56550 488940 0 0 3 0x14200 bored softnet
51399 501036 0 0 3 0x14200 bored systqmp
25920 132174 0 0 3 0x14200 bored systq
93950 149463 0 0 3 0x40014200 bored softclock
166 245736 0 0 3 0x40014200 idle0
75770 248918 0 0 3 0x14200 bored smr
1 443318 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 7301 (syz-executor.0) thread 0xffff800020b29080 (165198)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823e9b78) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:439
#0 witness_lock+0x594 sys/kern/subr_witness.c:1201
#1 ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231
#2 mi_switch+0x3ca sys/kern/sched_bsd.c:439
#3 sleep_finish+0x110 sys/kern/kern_synch.c:312
#4 _rw_enter+0x355 sys/kern/kern_rwlock.c:256
#5 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410
#6 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602
#7 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#8 vget+0x1c3 sys/kern/vfs_subr.c:672
#9 cache_lookup+0x300 sys/kern/vfs_cache.c:224
#10 ufs_lookup+0x1d7 sys/ufs/ufs/ufs_lookup.c:162
#11 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90
#12 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523
#13 namei+0x4b2 sys/kern/vfs_lookup.c:224
#14 domknodat+0xa1 sys/kern/vfs_syscalls.c:1405
#15 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#15 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574
#16 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd807af592c0) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547
#0 witness_lock+0x594 sys/kern/subr_witness.c:1201
#1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280
#2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410
#3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602
#4 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387
#6 namei+0x4b2 sys/kern/vfs_lookup.c:224
#7 domknodat+0xa1 sys/kern/vfs_syscalls.c:1405
#8 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#8 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9527 6425K 6434K 78643K 10906 0 0
pcb 26 9K 10K 78643K 389 0 0
rtable 100 3K 4K 78643K 623 0 0
ifaddr 61 13K 14K 78643K 218 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1489 0 0
iov 0 0K 24K 78643K 110 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1202 75K 76K 78643K 1662 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 15 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 0K 0K 78643K 107 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 21K 78643K 832 0 0
sigio 0 0K 0K 78643K 10 0 0
proc 57 63K 71K 78643K 617 0 0
subproc 64 65538K 67586K 78643K 346 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 115 0 0
in_multi 33 2K 2K 78643K 162 0 0
ether_multi 1 0K 0K 78643K 9 0 0
mrt 0 0K 0K 78643K 7 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 60 265K 265K 78643K 60 0 0
exec 0 0K 1K 78643K 313 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 89 21K 30K 78643K 3537 0 0
UVM aobj 53 2K 2K 78643K 60 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 47 0 0
NDP 15 0K 0K 78643K 68 0 0
temp 176 2379K 2444K 78643K 5918 0 0
kqueue 0 0K 0K 78643K 5 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 12 0 8 1 0 1 1 0 8 0
inpcbpl 280 474 0 467 1 0 1 1 0 8 0
plimitpl 152 50 0 42 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 114 0 74 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpqe 32 2 0 2 1 1 0 1 0 8 0
tcpcb 544 160 0 156 1 0 1 1 0 8 0
rttmr 72 1 0 1 1 0 1 1 0 8 1
nd6 48 20 0 16 1 0 1 1 0 8 0
ppxss 1128 26 0 26 4 3 1 1 0 8 1
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 36 0 24 1 0 1 1 0 8 0
pfstkey 112 36 0 24 1 0 1 1 0 8 0
pfstate 328 36 0 24 2 0 2 2 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 256 528 0 337 12 0 12 12 0 8 0
art_table 32 529 0 337 2 0 2 2 0 8 0
art_node 16 113 0 79 1 0 1 1 0 8 0
sysvmsgpl 40 13 0 4 1 0 1 1 0 8 0
semapl 112 105 0 95 1 0 1 1 0 8 0
shmpl 112 58 0 7 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 2758 0 1302 48 0 48 48 0 8 0
ffsino 272 2758 0 1302 98 0 98 98 0 8 0
nchpl 144 4121 0 2457 62 0 62 62 0 8 0
uvmvnodes 72 3015 0 0 55 0 55 55 0 8 0
vnodes 200 3015 0 0 159 0 159 159 0 8 0
namei 1024 12572 0 12570 2 1 1 1 0 8 0
percpumem 16 30 0 0 1 0 1 1 0 8 0
scsiplug 64 1 0 1 1 1 0 1 0 8 0
scxspl 192 11517 0 11517 12 9 3 6 0 8 3
sigapl 432 1008 0 992 2 0 2 2 0 8 0
futexpl 56 9150 0 9150 1 0 1 1 0 8 1
knotepl 112 362 0 343 1 0 1 1 0 8 0
kqueuepl 104 190 0 188 1 0 1 1 0 8 0
pipepl 112 656 0 637 2 1 1 1 0 8 0
fdescpl 488 1009 0 992 3 0 3 3 0 8 0
filepl 152 6131 0 6030 5 0 5 5 0 8 1
lockfpl 104 237 0 236 2 1 1 1 0 8 0
lockfspl 32 296 0 295 2 1 1 1 0 8 0
sessionpl 112 27 0 16 1 0 1 1 0 8 0
pgrppl 48 37 0 26 1 0 1 1 0 8 0
ucredpl 96 1238 0 1229 1 0 1 1 0 8 0
zombiepl 144 992 0 992 2 1 1 1 0 8 1
processpl 840 1025 0 992 4 0 4 4 0 8 0
procpl 600 2672 0 2625 4 0 4 4 0 8 0
srpgc 64 49 0 49 4 3 1 1 0 8 1
sosppl 128 13 0 13 4 4 0 1 0 8 0
sockpl 384 784 0 764 3 0 3 3 0 8 1
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 15 0 0 2 0 2 2 0 8 0
mcl9k 9216 6 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 125 0 0 15 1 14 15 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 194 0 0 9 1 8 8 0 8 0
bufpl 256 7442 0 1149 394 0 394 394 0 8 0
anonpl 16 108338 0 100778 68 26 42 52 0 125 5
amapchunkpl 152 5590 0 5501 15 7 8 9 0 158 4
amappl16 192 4636 0 4146 54 29 25 35 0 8 0
amappl15 184 209 0 205 1 0 1 1 0 8 0
amappl14 176 289 0 284 2 1 1 1 0 8 0
amappl13 168 27 0 24 1 0 1 1 0 8 0
amappl12 160 309 0 303 1 0 1 1 0 8 0
amappl11 152 100 0 85 1 0 1 1 0 8 0
amappl10 144 274 0 268 1 0 1 1 0 8 0
amappl9 136 639 0 636 1 0 1 1 0 8 0
amappl8 128 214 0 195 1 0 1 1 0 8 0
amappl7 120 136 0 128 1 0 1 1 0 8 0
amappl6 112 142 0 135 1 0 1 1 0 8 0
amappl5 104 422 0 406 1 0 1 1 0 8 0
amappl4 96 986 0 957 2 1 1 2 0 8 0
amappl3 88 399 0 392 1 0 1 1 0 8 0
amappl2 80 7556 0 7491 2 0 2 2 0 8 0
amappl1 72 31998 0 31530 26 16 10 20 0 8 0
amappl 72 2982 0 2944 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 59 0 7 1 0 1 1 0 8 0
uaddrrnd 24 1009 0 992 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1009 0 992 1 0 1 1 0 8 0
vmmpekpl 168 11964 0 11942 3 1 2 2 0 8 0
vmmpepl 168 115580 0 113984 117 36 81 81 0 357 11
vmsppl 360 1008 0 992 2 0 2 2 0 8 0
pdppl 4096 2026 0 1984 6 0 6 6 0 8 0
pvpl 32 318890 0 307984 160 46 114 134 0 265 14
pmappl 224 1008 0 992 2 1 1 2 0 8 0
extentpl 40 39 0 25 1 0 1 1 0 8 0
phpool 112 551 0 6 16 0 16 16 0 8 0