panic: kernel diagnostic assertion "tname->un_flags &panic: 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
* 27584 31622 0 0 0x4000000 1 syz-executor.1
280142 78788 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(ffffffff81f7e6d6,ffffffff81f69c32,2b1,ffffffff81f4f134) 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(ffffffff81f7e6d6,ffffffff81f69c32,2b1,ffffffff81f4f134) 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 0xffff800020c64fb0
rbx 0xffff800020c65060
rdx 0xffffffff81f8c339 apollo_pio_rec+0x95b5
rcx 0
rax 0
r8 0xffffffff818d1a13 kprintf+0x183
r9 0x1
r10 0x25
r11 0x73db6a0304fdca40
r12 0x3000000008
r13 0xffff800020c64fc0
r14 0x104
r15 0x1
rip 0xffffffff814367b8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c64fa0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=27584 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020b9b788,0xffff800020b9a4d8
process=0xffff800020b8c018 user=0xffff800020c60000, vmspace=0xfffffd807effdca8
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
31622 26882 81094 0 2 0 syz-executor.1
31622 363967 81094 0 2 0x4000000 syz-executor.1
*31622 27584 81094 0 7 0x4000000 syz-executor.1
31622 10951 81094 0 2 0x4000000 syz-executor.1
78788 420230 13738 0 2 0 syz-executor.0
78788 280142 13738 0 7 0x4000000 syz-executor.0
13738 453111 1058 0 3 0x82 nanosleep syz-executor.0
81094 279506 1058 0 3 0x82 nanosleep syz-executor.1
2224 346547 0 0 3 0x14200 bored sosplice
1058 421743 39619 0 3 0x82 thrsleep syz-fuzzer
1058 363767 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 280788 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 70505 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 145557 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 340504 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 441445 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 314181 39619 0 3 0x4000082 kqread syz-fuzzer
1058 203439 39619 0 3 0x4000082 thrsleep syz-fuzzer
1058 466307 39619 0 3 0x4000082 thrsleep syz-fuzzer
39619 164755 40717 0 3 0x10008a pause ksh
40717 169918 92673 0 3 0x92 select sshd
4238 105302 1 0 3 0x100083 ttyin getty
92673 357275 1 0 3 0x80 select sshd
20925 460789 78193 74 3 0x100092 bpf pflogd
78193 402296 1 0 3 0x80 netio pflogd
72492 364186 46684 73 3 0x100090 kqread syslogd
46684 495529 1 0 3 0x100082 netio syslogd
47081 6184 1 77 3 0x100090 poll dhclient
74690 40161 1 0 3 0x80 poll dhclient
43708 376583 0 0 2 0x14200 zerothread
6025 167506 0 0 3 0x14200 aiodoned aiodoned
73124 477963 0 0 3 0x14200 syncer update
96705 306501 0 0 3 0x14200 cleaner cleaner
39781 228467 0 0 3 0x14200 reaper reaper
85250 150027 0 0 3 0x14200 pgdaemon pagedaemon
44930 48025 0 0 3 0x14200 bored crynlk
91768 415187 0 0 3 0x14200 bored crypto
14042 159102 0 0 3 0x40014200 acpi0 acpi0
83981 180660 0 0 3 0x40014200 idle1
19109 334109 0 0 3 0x14200 bored softnet
70622 127628 0 0 3 0x14200 bored systqmp
48237 494671 0 0 3 0x14200 bored systq
4650 515955 0 0 3 0x40014200 bored softclock
80648 403872 0 0 3 0x40014200 idle0
5200 155208 0 0 3 0x14200 bored smr
1 53828 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 31622 (syz-executor.1) thread 0xffff800020b9b788 (363967)
exclusive rrwlock inode r = 0 (0xfffffd807daeca28) 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_write+0x169 vn_lock sys/kern/vfs_vnops.c:549 [inline]
#4 vn_write+0x169 sys/kern/vfs_vnops.c:393
#5 dofilewritev+0x1b0 sys/kern/sys_generic.c:364
#6 sys_pwritev+0xd9 sys/kern/vfs_syscalls.c:3161
#7 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#7 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574
#8 Xsyscall+0x128
Process 78788 (syz-executor.0) thread 0xffff800020b9a720 (280142)
exclusive rrwlock inode r = 0 (0xfffffd806e227f78) 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 vget+0x1c3 sys/kern/vfs_subr.c:672
#6 cache_lookup+0x300 sys/kern/vfs_cache.c:224
#7 ufs_lookup+0x1d7 sys/ufs/ufs/ufs_lookup.c:162
#8 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90
#9 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523
#10 namei+0x4b2 sys/kern/vfs_lookup.c:224
#11 sys_chdir+0x82 change_dir sys/kern/vfs_syscalls.c:856 [inline]
#11 sys_chdir+0x82 sys/kern/vfs_syscalls.c:802
#12 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#12 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574
#13 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82349ce8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
#0 witness_lock+0x594 sys/kern/subr_witness.c:1201
#1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline]
#1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574
#2 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9519 6413K 6439K 78643K 10830 0 0
pcb 25 9K 11K 78643K 350 0 0
rtable 100 3K 4K 78643K 508 0 0
ifaddr 58 13K 14K 78643K 157 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1482 0 0
iov 1 12K 24K 78643K 88 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1188 74K 75K 78643K 1576 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 20 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 1K 1K 78643K 857 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 21K 78643K 1652 0 0
sigio 0 0K 0K 78643K 6 0 0
proc 57 63K 71K 78643K 529 0 0
subproc 64 65538K 67586K 78643K 308 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 58 0 0
in_multi 33 2K 2K 78643K 125 0 0
ether_multi 1 0K 0K 78643K 4 0 0
mrt 0 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 72 318K 318K 78643K 72 0 0
exec 0 0K 1K 78643K 274 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 83 20K 29K 78643K 5436 0 0
UVM aobj 48 2K 2K 78643K 50 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 28 0 0
NDP 12 0K 0K 78643K 51 0 0
temp 171 2375K 2441K 78643K 8255 0 0
kqueue 0 0K 0K 78643K 9 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 11 0 7 1 0 1 1 0 8 0
inpcbpl 280 284 0 276 1 0 1 1 0 8 0
plimitpl 152 44 0 36 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 104 0 64 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpcb 544 115 0 110 1 0 1 1 0 8 0
nd6 48 18 0 14 1 0 1 1 0 8 0
ppxss 1128 12 0 12 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 32 0 19 1 0 1 1 0 8 0
pfstkey 112 32 0 19 1 0 1 1 0 8 0
pfstate 328 32 0 19 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 256 478 0 290 12 0 12 12 0 8 0
art_table 32 479 0 290 2 0 2 2 0 8 0
art_node 16 103 0 69 1 0 1 1 0 8 0
sysvmsgpl 40 34 0 3 1 0 1 1 0 8 0
semapl 112 855 0 845 1 0 1 1 0 8 0
shmpl 112 48 0 2 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 3976 0 2537 47 0 47 47 0 8 0
ffsino 272 3976 0 2537 97 0 97 97 0 8 0
nchpl 144 6663 0 5002 62 0 62 62 0 8 0
uvmvnodes 72 4169 0 0 76 0 76 76 0 8 0
vnodes 200 4169 0 0 220 0 220 220 0 8 0
namei 1024 17588 0 17587 2 1 1 1 0 8 0
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 19107 0 19107 12 11 1 6 0 8 1
sigapl 432 1830 0 1814 2 0 2 2 0 8 0
futexpl 56 18311 0 18311 2 1 1 1 0 8 1
knotepl 112 298 0 279 1 0 1 1 0 8 0
kqueuepl 104 171 0 169 1 0 1 1 0 8 0
pipepl 112 2202 0 2183 2 1 1 2 0 8 0
fdescpl 488 1831 0 1814 3 0 3 3 0 8 0
filepl 152 8083 0 7981 8 3 5 6 0 8 1
lockfpl 104 237 0 236 4 3 1 1 0 8 0
lockfspl 32 257 0 256 4 3 1 1 0 8 0
sessionpl 112 25 0 14 1 0 1 1 0 8 0
pgrppl 48 34 0 23 1 0 1 1 0 8 0
ucredpl 96 2377 0 2368 1 0 1 1 0 8 0
zombiepl 144 1814 0 1814 2 1 1 1 0 8 1
processpl 840 1847 0 1814 4 0 4 4 0 8 0
procpl 600 4635 0 4589 4 0 4 4 0 8 0
srpgc 64 42 0 42 3 3 0 1 0 8 0
sosppl 128 2 0 2 1 1 0 1 0 8 0
sockpl 384 593 0 573 8 4 4 4 0 8 2
mcl64k 65536 258 0 0 33 0 33 33 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 16 0 0 2 0 2 2 0 8 0
mcl9k 9216 5 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 12 0 0 2 0 2 2 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 116 0 0 14 0 14 14 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 409 0 0 23 0 23 23 0 8 0
bufpl 256 8615 0 1591 440 0 440 440 0 8 0
anonpl 16 156886 0 147928 73 23 50 50 0 125 13
amapchunkpl 152 8662 0 8565 13 8 5 9 0 158 0
amappl16 192 8006 0 7547 52 21 31 35 0 8 8
amappl15 184 682 0 677 1 0 1 1 0 8 0
amappl14 176 60 0 57 1 0 1 1 0 8 0
amappl13 168 1220 0 1215 1 0 1 1 0 8 0
amappl12 160 17 0 16 1 0 1 1 0 8 0
amappl11 152 573 0 558 1 0 1 1 0 8 0
amappl10 144 151 0 148 1 0 1 1 0 8 0
amappl9 136 723 0 719 1 0 1 1 0 8 0
amappl8 128 360 0 344 1 0 1 1 0 8 0
amappl7 120 125 0 119 1 0 1 1 0 8 0
amappl6 112 66 0 57 1 0 1 1 0 8 0
amappl5 104 284 0 270 1 0 1 1 0 8 0
amappl4 96 2210 0 2178 2 1 1 2 0 8 0
amappl3 88 179 0 173 1 0 1 1 0 8 0
amappl2 80 16081 0 16017 2 0 2 2 0 8 0
amappl1 72 45337 0 44858 25 15 10 20 0 8 0
amappl 72 4923 0 4885 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 49 0 2 1 0 1 1 0 8 0
uaddrrnd 24 1831 0 1814 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1831 0 1814 1 0 1 1 0 8 0
vmmpekpl 168 20354 0 20328 2 0 2 2 0 8 0
vmmpepl 168 193642 0 192067 109 31 78 79 0 357 9
vmsppl 360 1830 0 1814 2 0 2 2 0 8 0
pdppl 4096 3670 0 3628 6 0 6 6 0 8 0
pvpl 32 465782 0 453457 175 44 131 131 0 265 31
pmappl 224 1830 0 1814 3 2 1 2 0 8 0
extentpl 40 39 0 25 1 0 1 1 0 8 0
phpool 112 640 0 4 19 0 19 19 0 8 0