witness: lock order reversal:
1st 0xfffffd806f74b820 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd8055ec33d0 inode (&ip->i_lock)
lock order data w2 -> w1 missing
lock order data w1 -> w2 missing
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
witness_checkorder(fffffd8055ec33d0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8055ec33d0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105
rw_enter(fffffd8055ec33c0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd8055ec33c0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd80787e1018,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd80787e1018,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd804f2d6840,0,ffff8000256b6de8,ffff8000256b6db8,0,2) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd804f2d6840,0,ffff8000256b6de8,ffff8000256b6db8,0,2) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b6f50,ffff8000256b6f88,ffff8000256b6ed0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd806f0f8458,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b70e0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000256b70e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b7310) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b7310) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd9537beb3d0, count: -15
ddb{1}> show registers
rdi 0xffff80002349c000
rsi 0x13043 mp_pdirpa+0x203d
rbp 0xffff8000256b6a60
rbx 0x3
rdx 0xffff80002349c000
rcx 0x13042 mp_pdirpa+0x203c
rax 0xffffffff8143b2a7 db_enter+0x17
r8 0xffffffff81222ddc witness_checkorder+0x10cc
r9 0x5
r10 0x939be8dc1d511c25
r11 0x2a8d7f992ef90af8
r12 0xfffffd8002dab7c0
r13 0
r14 0
r15 0
rip 0xffffffff8143b2a8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000256b6a50
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=51350 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=32, usrpri=79, nice=20
forw=0xffffffffffffffff, list=0xffff8000212102a8,0xffff800021210fd8
process=0xffff8000ffff9d58 user=0xffff8000256b2000, vmspace=0xfffffd806f0f8458
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
89058 320911 68161 32767 2 0x10 syz-executor.0
63219 359347 78864 32767 7 0x10 syz-executor.1
*63219 51350 78864 32767 7 0x4000010 syz-executor.1
21025 266318 0 0 3 0x14200 bored sosplice
78864 396199 65098 32767 3 0x90 nanoslp syz-executor.1
68161 270073 56842 32767 3 0x90 nanoslp syz-executor.0
65098 190896 9596 0 3 0x82 wait syz-executor.1
56842 376578 9596 0 3 0x82 wait syz-executor.0
9596 488167 48672 0 3 0x82 thrsleep syz-fuzzer
9596 307305 48672 0 3 0x4000082 nanoslp syz-fuzzer
9596 58032 48672 0 3 0x4000082 kqread syz-fuzzer
9596 110280 48672 0 3 0x4000082 thrsleep syz-fuzzer
9596 387471 48672 0 3 0x4000082 thrsleep syz-fuzzer
9596 474754 48672 0 3 0x4000082 thrsleep syz-fuzzer
9596 486568 48672 0 3 0x4000082 thrsleep syz-fuzzer
9596 340451 48672 0 3 0x4000082 nanoslp syz-fuzzer
48672 112848 84782 0 3 0x10008a sigsusp ksh
84782 123187 10432 0 3 0x9a select sshd
56458 389613 1 0 3 0x100083 ttyin getty
10432 469704 1 0 3 0x88 select sshd
44567 12544 87745 73 3 0x100090 kqread syslogd
87745 173631 1 0 3 0x100082 netio syslogd
97055 440876 1 0 3 0x100080 kqread resolvd
70115 485209 79071 77 3 0x100092 kqread dhcpleased
39965 177218 79071 77 3 0x100092 kqread dhcpleased
79071 273848 1 0 3 0x80 kqread dhcpleased
56511 253941 0 0 3 0x14200 bored smr
56704 341042 0 0 2 0x14200 zerothread
40169 32178 0 0 3 0x14200 aiodoned aiodoned
95566 132416 0 0 3 0x14200 syncer update
89638 357866 0 0 3 0x14200 cleaner cleaner
22500 179742 0 0 3 0x14200 reaper reaper
37343 369122 0 0 3 0x14200 pgdaemon pagedaemon
71195 123355 0 0 3 0x14200 bored crynlk
17303 238393 0 0 3 0x14200 bored crypto
47283 290193 0 0 3 0x14200 bored viomb
29670 142972 0 0 3 0x40014200 acpi0 acpi0
10145 156197 0 0 3 0x40014200 idle1
52 488950 0 0 3 0x14200 bored softnet
92018 227332 0 0 3 0x14200 bored systqmp
44605 157313 0 0 3 0x14200 bored systq
4922 395191 0 0 3 0x40014200 bored softclock
21300 246307 0 0 3 0x40014200 idle0
1 384281 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 63219 (syz-executor.1) thread 0xffff800021211ce8 (51350)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829423a8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#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
exclusive rwlock fdlock r = 0 (0xfffffd806f74b820)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 sys_socketpair+0x20f
#2 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#3 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10115 6354K 6380K 78643K 11205 0
pcb 13 8K 8K 78643K 13 0
rtable 106 3K 3K 78643K 168 0
ifaddr 39 10K 10K 78643K 39 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 2K 78643K 91 0
iov 0 0K 0K 78643K 1086 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1216 76K 76K 78643K 1222 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 8 0
VM map 2 1K 1K 78643K 2 0
sem 11 1K 1K 78643K 13 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 8 25K 33K 78643K 23753 0
sigio 0 0K 0K 78643K 20 0
proc 56 74K 99K 78643K 285 0
subproc 34 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 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 31 148K 148K 78643K 31 0
exec 0 0K 2K 78643K 376 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 670 73K 73K 78643K 294220 0
UVM aobj 10 2K 2K 78643K 12 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 5 0K 0K 78643K 9 0
temp 101 4205K 4269K 78643K 49585 0
kqueue 10 14K 19K 78643K 19 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 21 0 18 1 0 1 1 0 8 0
rtentry 112 45 0 1 2 0 2 2 0 8 0
unpcb 120 44280 0 44263 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpqe 32 543 0 543 5 5 0 4 0 8 0
tcpcb 736 21 0 17 1 0 1 1 0 8 0
arp 120 6 0 0 1 0 1 1 0 8 0
inpcb 304 8336 0 8328 11 9 2 2 0 8 1
nd6 48 6 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 189 0 0 12 0 12 12 0 8 0
art_table 32 190 0 0 2 0 2 2 0 8 0
art_node 16 44 0 4 1 0 1 1 0 8 0
sysvmsgpl 40 20 0 4 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 9 0 0 1 0 1 1 0 8 0
shmpl 112 9 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 27546 0 26142 88 0 88 88 0 8 0
ffsino 272 27546 0 26142 95 1 94 94 0 8 0
nchpl 144 60731 0 59116 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 121376 0 121376 2 1 1 1 0 8 1
percpumem 16 34 0 0 1 0 1 1 0 8 0
scxspl 216 154539 0 154539 11 10 1 8 0 8 1
plimitpl 152 19 0 9 1 0 1 1 0 8 0
sigapl 424 23976 0 23940 5 0 5 5 0 8 0
futexpl 56 143829 0 143829 1 0 1 1 0 8 1
knotepl 112 50 0 0 2 0 2 2 0 8 0
kqueuepl 216 5770 0 5764 3 2 1 2 0 8 0
pipepl 336 1096 0 1086 14 12 2 2 0 8 1
fdescpl 496 23959 0 23940 3 0 3 3 0 8 0
filepl 152 102726 0 102611 8 3 5 6 0 8 0
lockfpl 104 79 0 75 1 0 1 1 0 8 0
lockfspl 48 30 0 26 1 0 1 1 0 8 0
sessionpl 144 17 0 7 1 0 1 1 0 8 0
pgrppl 48 17 0 7 1 0 1 1 0 8 0
ucredpl 96 3535 0 3523 1 0 1 1 0 8 0
zombiepl 144 23940 0 23940 2 1 1 1 0 8 1
processpl 1072 23976 0 23940 3 0 3 3 0 8 0
procpl 672 49722 0 49678 13 9 4 5 0 8 0
sosppl 168 3154 0 3154 8 7 1 1 0 8 1
sockpl 480 52677 0 52649 14 9 5 6 0 8 1
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 10 0 0 2 0 2 2 0 8 0
mcl12k 12288 25 0 0 2 0 2 2 0 8 0
mcl9k 9216 17 0 0 2 0 2 2 0 8 0
mcl8k 8192 9 0 0 2 0 2 2 0 8 0
mcl4k 4096 33 0 0 4 1 3 3 0 8 0
mcl2k2 2112 17 0 0 2 0 2 2 0 8 0
mcl2k 2048 537 0 0 61 25 36 61 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 915 0 0 34 0 34 34 0 8 0
bufpl 280 27091 0 20759 453 0 453 453 0 8 0
anonpl 24 6073826 0 5974302 700 7 693 699 0 186 0
amapchunkpl 152 666150 0 662506 156 3 153 154 0 158 0
amappl16 200 49210 0 45755 183 1 182 182 0 8 0
amappl15 192 5 0 1 1 0 1 1 0 8 0
amappl14 184 4 0 1 1 0 1 1 0 8 0
amappl13 176 30 0 27 1 0 1 1 0 8 0
amappl12 168 4 0 3 2 1 1 1 0 8 0
amappl11 160 11897 0 11884 1 0 1 1 0 8 0
amappl10 152 11910 0 11902 1 0 1 1 0 8 0
amappl9 144 34 0 32 1 0 1 1 0 8 0
amappl8 136 374 0 319 2 0 2 2 0 8 0
amappl7 128 70 0 54 1 0 1 1 0 8 0
amappl6 120 111 0 98 1 0 1 1 0 8 0
amappl5 112 26112 0 26092 1 0 1 1 0 8 0
amappl4 104 24253 0 24221 1 0 1 1 0 8 0
amappl3 96 1808 0 1805 1 0 1 1 0 8 0
amappl2 88 484 0 431 2 0 2 2 0 8 0
amappl1 80 410443 0 410000 15 5 10 12 0 8 0
amappl 88 280244 0 279658 14 0 14 14 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 11 0 2 1 0 1 1 0 8 0
uaddrrnd 24 23959 0 23940 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 23959 0 23940 1 0 1 1 0 8 0
vmmpekpl 168 111970 0 111949 2 0 2 2 0 8 0
vmmpepl 168 2736676 0 2731272 385 148 237 373 0 357 2
vmsppl 368 23958 0 23940 2 0 2 2 0 8 0
rwobjpl 56 459123 0 454501 72 6 66 66 0 8 0
pdppl 4096 47925 0 47880 71 26 45 49 0 8 0
pvpl 32 13853956 0 13750747 973 18 955 970 0 265 0
pmappl 224 23958 0 23940 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 398 0 68 11 0 11 11 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff82807ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:353
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 kd_curproc sys/dev/kcov.c:559 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 sys/dev/kcov.c:143
__mp_lock(ffffffff829421a0) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829421a0) at __mp_lock+0x133 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffc9e80, count: -7
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
witness_checkorder(fffffd8055ec33d0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8055ec33d0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105
rw_enter(fffffd8055ec33c0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd8055ec33c0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd80787e1018,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd80787e1018,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd804f2d6840,0,ffff8000256b6de8,ffff8000256b6db8,0,2) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd804f2d6840,0,ffff8000256b6de8,ffff8000256b6db8,0,2) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b6f50,ffff8000256b6f88,ffff8000256b6ed0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd806f0f8458,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b70e0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000256b70e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b7310) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b7310) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd9537beb3d0, count: -15