login: witness: lock order reversal:
1st 0xfffffd8078de3258 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd806d6f13d8 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:398
witness_checkorder(fffffd806d6f13d8,9,0) at witness_checkorder+0x108b
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2229aa33480, count: -15
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff82701ff0 __sancov_gen_cov_switch_values.134
rbp 0xffff80002126e880
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x1
r8 0xffffffff8157e211 witness_checkorder+0x1061
r9 0x5
r10 0xa5633de55a00ae8
r11 0xe65e1acd83735101
r12 0
r13 0xfffffd806d6f13d8
r14 0
r15 0xfffffd8002cfa740
rip 0xffffffff8215de78 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002126e870
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor1318) pid=437562 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=17, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000211b2548,0xffff8000211ffcf0
process=0xffff800021225528 user=0xffff80002126a000, vmspace=0xfffffd807f00aa10
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
18658 367970 33679 0 2 0 syz-executor1318
18658 147011 33679 0 2 0x4000000 syz-executor1318
18658 279271 33679 0 2 0x4000000 syz-executor1318
81172 122678 68255 0 7 0 syz-executor1318
81172 120155 68255 0 2 0x4000000 syz-executor1318
*81172 437562 68255 0 7 0x4000000 syz-executor1318
68255 204459 26179 0 3 0x80 nanoslp syz-executor1318
33679 41886 26179 0 3 0x80 nanoslp syz-executor1318
26179 435943 34781 0 3 0x82 nanoslp syz-executor1318
34781 106065 75170 0 3 0x10008a sigsusp ksh
75170 13804 62453 0 3 0x92 select sshd
84191 8621 1 0 3 0x100083 ttyin getty
62453 515962 1 0 3 0x80 select sshd
5006 457843 94027 74 3 0x100092 bpf pflogd
94027 361569 1 0 3 0x80 netio pflogd
78923 452222 47376 73 3 0x100090 kqread syslogd
47376 314832 1 0 3 0x100082 netio syslogd
42503 373725 1 77 3 0x100090 poll dhclient
96507 362896 1 0 3 0x80 poll dhclient
61410 167439 0 0 3 0x14200 bored smr
56402 233381 0 0 2 0x14200 zerothread
75076 500739 0 0 3 0x14200 aiodoned aiodoned
94364 509141 0 0 3 0x14200 syncer update
4182 18791 0 0 3 0x14200 cleaner cleaner
25683 369622 0 0 3 0x14200 reaper reaper
69374 20730 0 0 3 0x14200 pgdaemon pagedaemon
24845 41843 0 0 3 0x14200 bored crynlk
13311 474656 0 0 3 0x14200 bored crypto
16610 314362 0 0 3 0x14200 bored viomb
38177 462861 0 0 3 0x40014200 acpi0 acpi0
25468 378697 0 0 3 0x40014200 idle1
21756 25469 0 0 3 0x14200 bored softnet
24875 110186 0 0 3 0x14200 bored systqmp
55786 27774 0 0 3 0x14200 bored systq
9218 518078 0 0 3 0x40014200 bored softclock
72794 155600 0 0 3 0x40014200 idle0
1 275794 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 81172 (syz-executor1318) thread 0xffff8000ffff7cf0 (437562)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828b2e60)
#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+0x23a sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
exclusive rwlock fdlock r = 0 (0xfffffd8078de3258)
#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+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#3 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10112 6476K 6477K 78643K 11202 0
pcb 13 8K 8K 78643K 13 0
rtable 61 2K 2K 78643K 119 0
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 4K 78643K 1467 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 1 0
vnodes 1183 74K 75K 78643K 1221 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 1 0K 0K 78643K 1 0
proc 59 63K 71K 78643K 357 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 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 19 95K 95K 78643K 19 0
exec 0 0K 2K 78643K 300 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 99 4K 5K 78643K 1834 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 4 0K 0K 78643K 4 0
temp 23 3969K 4033K 78643K 1745 0
kqueue 2 2K 2K 78643K 2 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 20 0 0 1 0 1 1 0 8 0
rtpcb 120 15 0 13 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 163 0 151 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 28 0 23 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 9 0 2 1 0 1 1 0 8 0
pfstkey 112 9 0 2 1 0 1 1 0 8 0
pfstate 320 9 0 2 1 0 1 1 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 97 0 0 7 0 7 7 0 8 0
art_table 32 98 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1504 0 115 87 0 87 87 0 8 0
ffsino 272 1504 0 115 93 0 93 93 0 8 0
nchpl 144 1715 0 167 58 0 58 58 0 8 0
uvmvnodes 72 1514 0 0 28 0 28 28 0 8 0
vnodes 224 1514 0 0 90 0 90 90 0 8 0
namei 1024 4052 0 4052 2 1 1 1 0 8 1
percpumem 16 31 0 0 1 0 1 1 0 8 0
scxspl 216 3974 0 3974 11 10 1 8 0 8 1
plimitpl 152 14 0 8 1 0 1 1 0 8 0
sigapl 424 257 0 224 4 0 4 4 0 8 0
futexpl 56 75 0 75 1 0 1 1 0 8 1
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 168 1 0 0 1 0 1 1 0 8 0
pipepl 336 64 0 60 2 1 1 1 0 8 0
fdescpl 496 241 0 224 3 0 3 3 0 8 0
filepl 152 1091 0 1041 2 0 2 2 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 18 0 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 62 0 53 1 0 1 1 0 8 0
zombiepl 144 224 0 224 2 1 1 1 0 8 1
processpl 1080 257 0 224 3 0 3 3 0 8 0
procpl 672 296 0 259 4 0 4 4 0 8 0
sockpl 480 206 0 187 4 1 3 3 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 82 0 0 11 0 11 11 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 127 0 0 7 0 7 7 0 8 0
bufpl 280 2056 0 90 141 0 141 141 0 8 0
anonpl 24 35780 0 33232 18 2 16 16 0 186 0
amapchunkpl 152 3504 0 3322 9 1 8 8 0 158 1
amappl16 200 66 0 62 1 0 1 1 0 8 0
amappl15 192 51 0 46 1 0 1 1 0 8 0
amappl13 176 14 0 13 2 1 1 1 0 8 0
amappl12 168 27 0 24 1 0 1 1 0 8 0
amappl11 160 44 0 32 1 0 1 1 0 8 0
amappl10 152 6 0 2 1 0 1 1 0 8 0
amappl9 144 241 0 241 3 2 1 1 0 8 1
amappl8 136 240 0 235 1 0 1 1 0 8 0
amappl7 128 36 0 32 1 0 1 1 0 8 0
amappl6 120 82 0 73 1 0 1 1 0 8 0
amappl5 112 137 0 127 1 0 1 1 0 8 0
amappl4 104 504 0 482 1 0 1 1 0 8 0
amappl3 96 68 0 62 1 0 1 1 0 8 0
amappl2 88 345 0 306 1 0 1 1 0 8 0
amappl1 80 7038 0 6644 12 3 9 9 0 8 0
amappl 88 1628 0 1548 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 241 0 224 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 241 0 224 1 0 1 1 0 8 0
vmmpekpl 168 5592 0 5575 1 0 1 1 0 8 0
vmmpepl 168 21769 0 20802 46 3 43 43 0 357 0
vmsppl 368 240 0 224 2 0 2 2 0 8 0
rwobjpl 56 6618 0 6085 10 2 8 8 0 8 0
pdppl 4096 489 0 448 59 18 41 41 0 8 0
pvpl 32 107277 0 102784 44 7 37 37 0 265 0
pmappl 232 240 0 224 1 0 1 1 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 281 0 23 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff8270cff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828b2c58) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828b2c58) at __mp_lock+0x122 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: 0x7f7ffffe8bd0, count: -6
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:398
witness_checkorder(fffffd806d6f13d8,9,0) at witness_checkorder+0x108b
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2229aa33480, count: -15
ddb{1}>