witness: lock order reversal:
1st 0xffff800020b3b228 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff8236c9d8 &sched_lock (&sched_lock)
lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 mtx_enter+0x3a sys/kern/kern_lock.c:265
#2 tuagg+0x32 sys/kern/kern_resource.c:360
#3 mi_switch+0x1c7 x86_atomic_clearbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:298 [inline]
#3 mi_switch+0x1c7 sys/kern/sched_bsd.c:392
#4 sleep_finish+0x110 sys/kern/kern_synch.c:303
#5 msleep+0x1af sleep_finish_timeout sys/kern/kern_synch.c:327 [inline]
#5 msleep+0x1af sleep_finish_all sys/kern/kern_synch.c:157 [inline]
#5 msleep+0x1af sys/kern/kern_synch.c:220
#6 scsi_xs_sync+0x14f sys/scsi/scsi_base.c:1339
#7 scsi_start+0x86 sys/scsi/scsi_base.c:938
#8 sdopen+0x22b sys/scsi/sd.c:400
#9 spec_open+0x41c sys/kern/spec_vnops.c:158
#10 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153
#11 sr_meta_native_bootprobe+0xd3 sys/dev/softraid.c:1038
#12 sr_boot_assembly+0x1aa sys/dev/softraid.c:1202
#13 sr_attach+0x183 sys/dev/softraid.c:1822
#14 config_attach+0x347 sys/kern/subr_autoconf.c:404
#15 main+0x6de sys/kern/init_main.c:483
#16 longmode_hi+0x95
lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 __mp_lock+0xa1
#2 schedclock+0x99 sys/kern/sched_bsd.c:547
#3 hardclock+0x1d8 sys/kern/kern_clock.c:174
#4 lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425
#5 Xresume_lapic_ltimer+0x26
#6 calcru
#7 sys_exit+0x17 sys/kern/kern_exit.c:94
#8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#8 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#9 Xsyscall+0x128
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(ffffffff8236c9d8,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff8236c9d8,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1084
__mp_lock(ffffffff8236c7d0) at __mp_lock+0xa1
schedclock(ffff800020b38018) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800024e458d0) at hardclock+0x1d8 sys/kern/kern_clock.c:174
lapic_clockintr(0,0) at lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425
Xresume_lapic_ltimer(9,0,ffff800020b3b218,0,ffff800020b3b168,2000) at Xresume_lapic_ltimer+0x26
calcru(ffff800020b38018,0,1,ffff800020b38018) at calcru
sys_exit(ffff800020b38018,ffff800024e45a50,ffff800024e45ac0) at sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800024e45b30) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800024e45b30) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,0,1,0,7f7ffffde564) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffde530, count: -11
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff821c7a20 __sancov_gen_cov_switch_values.122
rbp 0xffff800024e456d0
rbx 0x3
rdx 0xffff800020ab0ff0
rcx 0x3
rax 0xffff800020ab0ff0
r8 0xffffffff813b9985 witness_checkorder+0xfd5
r9 0x5
r10 0x3
r11 0x3bf7d98163fadde4
r12 0xfffffd8002662340
r13 0xc
r14 0xffffffff82301330 w_lodata+0x3fcf0
r15 0xffffffff823187d0 w_lodata+0x57190
rip 0xffffffff81e8beb8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800024e456c0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=31434 stat=dead
flags process=1018<EXITING,SUGID,SINGLEEXIT> proc=2000<WEXIT>
pri=26, usrpri=77, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020b3b168 user=0xffff800024e40000, vmspace=0xfffffd807effe870
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
555 21232 35878 32767 3 0x90 nanosleep syz-executor.0
35878 522278 48591 0 3 0x82 wait syz-executor.0
14386 90178 5710 32767 3 0x90 nanosleep syz-executor.1
5710 335400 48591 0 3 0x82 wait syz-executor.1
75032 122616 0 0 3 0x14200 bored sosplice
48591 503814 74508 0 3 0x82 thrsleep syz-fuzzer
48591 260391 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 34597 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 76680 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 241393 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 399574 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 292434 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 162146 74508 0 3 0x4000082 thrsleep syz-fuzzer
48591 371082 74508 0 3 0x4000082 kqread syz-fuzzer
48591 420016 74508 0 3 0x4000082 thrsleep syz-fuzzer
74508 426253 87920 0 3 0x10008a pause ksh
87920 33092 13432 0 3 0x92 select sshd
27224 318793 1 0 3 0x100083 ttyin getty
13432 164450 1 0 3 0x80 select sshd
12215 393081 68232 73 2 0x100090 syslogd
68232 237992 1 0 3 0x100082 netio syslogd
58560 127125 1 77 3 0x100090 poll dhclient
39257 369586 1 0 3 0x80 poll dhclient
67152 213305 0 0 3 0x14200 pgzero zerothread
69028 249331 0 0 3 0x14200 aiodoned aiodoned
47533 174702 0 0 3 0x14200 syncer update
27736 361719 0 0 3 0x14200 cleaner cleaner
30759 286359 0 0 7 0x14200 reaper
33236 1750 0 0 3 0x14200 pgdaemon pagedaemon
98289 514066 0 0 3 0x14200 bored crynlk
41000 4395 0 0 3 0x14200 bored crypto
35729 326063 0 0 3 0x40014200 acpi0 acpi0
99734 474387 0 0 3 0x40014200 idle1
98213 409016 0 0 3 0x14200 bored softnet
50731 363812 0 0 3 0x14200 bored systqmp
2856 267653 0 0 3 0x14200 bored systq
11899 45010 0 0 3 0x40014200 bored softclock
75295 302491 0 0 3 0x40014200 idle0
16581 462013 0 0 3 0x14200 bored smr
1 356022 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pr->ps_mtx r = 0 (0xffff800020b3b228)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 exit1+0x722 sys/kern/kern_exit.c:300
#4 sys_exit+0x17 sys/kern/kern_exit.c:94
#5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#5 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#6 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9459 6321K 6321K 78643K 10871 0 0
pcb 23 9K 11K 78643K 2475 0 0
rtable 105 3K 3K 78643K 3112 0 0
ifaddr 37 12K 12K 78643K 436 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 149 0 0
iov 0 0K 32K 78643K 365 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1209 76K 76K 78643K 3074 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 9K 78643K 72 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 11 1K 1K 78643K 13 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 33K 78643K 10187 0 0
sigio 0 0K 0K 78643K 80 0 0
proc 41 38K 70K 78643K 3317 0 0
subproc 34 2K 2K 78643K 1139 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 1214 0 0
in_multi 33 2K 2K 78643K 949 0 0
ether_multi 1 0K 0K 78643K 49 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 54 238K 238K 78643K 54 0 0
exec 0 0K 1K 78643K 1201 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 108 22K 31K 78643K 29000 0 0
UVM aobj 130 4K 4K 78643K 156 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 294 0 0
NDP 7 0K 0K 78643K 204 0 0
temp 121 2734K 2826K 78643K 31313 0 0
kqueue 0 0K 0K 78643K 41 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 64 136 0 130 1 0 1 1 0 8 0
inpcbpl 280 3146 0 3139 1 0 1 1 0 8 0
plimitpl 152 3408 0 3399 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 760 0 716 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpcb 544 1801 0 1797 1 0 1 1 0 8 0
nd6 48 201 0 195 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 3123 0 2931 15 3 12 13 0 8 0
art_table 32 3124 0 2931 2 0 2 2 0 8 0
art_node 16 759 0 719 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0
semapl 112 11 0 2 2 1 1 1 0 8 0
shmpl 112 154 0 26 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 11991 0 10509 49 1 48 48 0 8 0
ffsino 272 11991 0 10509 100 1 99 99 0 8 0
nchpl 144 23276 0 21657 61 0 61 61 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 200 5926 0 0 312 0 312 312 0 8 0
namei 1024 93920 0 93920 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 70768 0 70768 24 23 1 6 0 8 1
sigapl 432 10163 0 10148 6 4 2 3 0 8 0
futexpl 56 66059 0 66059 1 0 1 1 0 8 1
knotepl 112 2031 0 2012 1 0 1 1 0 8 0
kqueuepl 104 752 0 750 1 0 1 1 0 8 0
pipepl 112 2746 0 2727 6 5 1 2 0 8 0
fdescpl 488 10164 0 10149 3 0 3 3 0 8 1
filepl 152 55972 0 55876 25 20 5 6 0 8 1
lockfpl 104 979 0 979 22 21 1 1 0 8 1
lockfspl 48 311 0 311 22 21 1 1 0 8 1
sessionpl 112 82 0 72 1 0 1 1 0 8 0
pgrppl 48 116 0 106 1 0 1 1 0 8 0
ucredpl 96 25825 0 25816 1 0 1 1 0 8 0
zombiepl 144 10149 0 10147 2 1 1 1 0 8 0
processpl 888 10180 0 10147 4 0 4 4 0 8 0
procpl 600 25596 0 25552 4 0 4 4 0 8 0
srpgc 64 390 0 390 14 13 1 1 0 8 1
sosppl 128 95 0 95 14 13 1 1 0 8 1
sockpl 384 5691 0 5674 17 14 3 4 0 8 1
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 15 0 0 2 0 2 2 0 8 0
mcl9k 9216 13 0 0 1 0 1 1 0 8 0
mcl8k 8192 16 0 0 2 0 2 2 0 8 0
mcl4k 4096 25 0 0 3 0 3 3 0 8 0
mcl2k2 2112 5 0 0 1 0 1 1 0 8 0
mcl2k 2048 251 0 0 11 2 9 11 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 473 0 0 13 1 12 13 0 8 0
bufpl 256 20325 0 13320 439 0 439 439 0 8 0
anonpl 16 743976 0 740101 124 93 31 34 0 125 9
amapchunkpl 152 53441 0 53354 29 20 9 9 0 158 4
amappl16 192 40043 0 39848 116 101 15 23 0 8 5
amappl15 184 720 0 720 8 8 0 1 0 8 0
amappl14 176 1122 0 1118 2 1 1 1 0 8 0
amappl13 168 2087 0 2087 12 11 1 1 0 8 1
amappl12 160 1724 0 1719 1 0 1 1 0 8 0
amappl11 152 948 0 931 1 0 1 1 0 8 0
amappl10 144 3243 0 3239 2 1 1 1 0 8 0
amappl9 136 1757 0 1754 1 0 1 1 0 8 0
amappl8 128 1363 0 1318 3 1 2 2 0 8 0
amappl7 120 3259 0 3251 1 0 1 1 0 8 0
amappl6 112 860 0 842 1 0 1 1 0 8 0
amappl5 104 2542 0 2529 1 0 1 1 0 8 0
amappl4 96 10753 0 10727 1 0 1 1 0 8 0
amappl3 88 1692 0 1681 1 0 1 1 0 8 0
amappl2 80 74553 0 74488 4 2 2 3 0 8 0
amappl1 72 244742 0 244292 29 20 9 19 0 8 0
amappl 80 26801 0 26765 1 0 1 1 0 84 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 64 155 0 26 3 0 3 3 0 8 0
uaddrrnd 24 10164 0 10148 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 10164 0 10148 1 0 1 1 0 8 0
vmmpekpl 168 68394 0 68363 2 0 2 2 0 8 0
vmmpepl 168 1067785 0 1066457 180 114 66 74 0 357 5
vmsppl 360 10163 0 10148 2 0 2 2 0 8 0
pdppl 4096 20336 0 20296 6 0 6 6 0 8 1
pvpl 32 3432884 0 3425739 354 259 95 102 0 265 28
pmappl 232 10163 0 10148 11 10 1 2 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 600 0 10 17 0 17 17 0 8 0