witness: lock order reversal:
1st 0xffff800020b8d230 &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 __sanitizer_cov_trace_pc+0x7 sys/dev/kcov.c:86
#7 exit1+0x8bf sys/kern/kern_exit.c:349
#8 sys_exit+0x17 sys/kern/kern_exit.c:94
#9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#9 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#10 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(ffff800020b392d8) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800025023a80) 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,ffffffff819f9bf6,0,0,ffff800020b8d220,ffff800020b392d8) at Xresume_lapic_ltimer+0x26
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x7 sys/dev/kcov.c:86
exit1(ffff800020b392d8,0,1) at exit1+0x8bf sys/kern/kern_exit.c:349
sys_exit(ffff800020b392d8,ffff800025023c70,ffff800025023ce0) at sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800025023d50) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800025023d50) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,0,1,0,7f7ffffc4e74) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc4e40, count: -12
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff821c7a20 __sancov_gen_cov_switch_values.122
rbp 0xffff800025023880
rbx 0x3
rdx 0xffff800020ab0ff0
rcx 0x3
rax 0xffff800020ab0ff0
r8 0xffffffff813b9985 witness_checkorder+0xfd5
r9 0x5
r10 0x3
r11 0xc03ef5ca9ace45e9
r12 0xfffffd8002662340
r13 0xc
r14 0xffffffff823086b0 w_lodata+0x47070
r15 0xffffffff82318670 w_lodata+0x57030
rip 0xffffffff81e8beb8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800025023870
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=473596 stat=dead
flags process=1018<EXITING,SUGID,SINGLEEXIT> proc=2000<WEXIT>
pri=50, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020b8d170 user=0xffff80002501e000, vmspace=0xfffffd806e8da710
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
21679 334888 22364 32767 3 0x90 nanosleep syz-executor.1
22364 63863 70504 0 3 0x82 wait syz-executor.1
10108 362152 34121 32767 3 0x90 nanosleep syz-executor.0
34121 339507 70504 0 3 0x82 wait syz-executor.0
53072 345340 0 0 3 0x14200 bored sosplice
70504 396137 30167 0 3 0x82 kqread syz-fuzzer
70504 384906 30167 0 3 0x4000082 nanosleep syz-fuzzer
70504 327697 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 19436 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 492699 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 157112 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 341455 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 72393 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 100421 30167 0 3 0x4000082 thrsleep syz-fuzzer
70504 483074 30167 0 3 0x4000082 thrsleep syz-fuzzer
30167 40333 36331 0 3 0x10008a pause ksh
36331 35566 84364 0 3 0x92 select sshd
89314 488196 1 0 3 0x100083 ttyin getty
84364 416406 1 0 3 0x80 select sshd
38787 470984 68189 73 2 0x100090 syslogd
68189 422918 1 0 3 0x100082 netio syslogd
26463 198796 1 77 3 0x100090 poll dhclient
38688 513179 1 0 3 0x80 poll dhclient
86396 325721 0 0 3 0x14200 pgzero zerothread
89408 258797 0 0 3 0x14200 aiodoned aiodoned
88452 423460 0 0 3 0x14200 syncer update
69914 238755 0 0 3 0x14200 cleaner cleaner
66879 451006 0 0 7 0x14200 reaper
69346 127266 0 0 3 0x14200 pgdaemon pagedaemon
80804 299445 0 0 3 0x14200 bored crynlk
95562 16477 0 0 3 0x14200 bored crypto
69088 227472 0 0 3 0x40014200 acpi0 acpi0
98737 351783 0 0 3 0x40014200 idle1
60476 183100 0 0 3 0x14200 bored softnet
56783 203062 0 0 3 0x14200 bored systqmp
73120 151207 0 0 3 0x14200 bored systq
51387 88913 0 0 3 0x40014200 bored softclock
23755 266237 0 0 3 0x40014200 idle0
75287 358247 0 0 3 0x14200 bored smr
1 492606 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 (0xffff800020b8d230)
#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 sched_exit+0xa5 sys/kern/kern_sched.c:224
#4 exit1+0x8bf sys/kern/kern_exit.c:349
#5 sys_exit+0x17 sys/kern/kern_exit.c:94
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#7 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9460 6321K 6321K 78643K 10837 0 0
pcb 23 9K 11K 78643K 1486 0 0
rtable 105 3K 3K 78643K 2787 0 0
ifaddr 36 11K 11K 78643K 396 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 116 0 0
iov 0 0K 32K 78643K 167 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1209 76K 76K 78643K 2758 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 25 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 0K 0K 78643K 183 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 33K 78643K 2970 0 0
sigio 0 0K 0K 78643K 28 0 0
proc 41 38K 70K 78643K 2964 0 0
subproc 34 2K 2K 78643K 1020 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 274 0 0
in_multi 33 2K 2K 78643K 744 0 0
ether_multi 1 0K 0K 78643K 17 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 1064 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 90 21K 31K 78643K 10553 0 0
UVM aobj 72 3K 3K 78643K 82 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 131 0 0
NDP 7 0K 0K 78643K 183 0 0
temp 120 2730K 2798K 78643K 15785 0 0
kqueue 0 0K 0K 78643K 26 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 64 122 0 116 1 0 1 1 0 8 0
inpcbpl 280 1348 0 1341 1 0 1 1 0 8 0
plimitpl 152 241 0 232 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 683 0 639 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpcb 544 475 0 469 1 0 1 1 0 8 0
nd6 48 180 0 174 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2809 0 2618 14 2 12 13 0 8 0
art_table 32 2810 0 2618 2 0 2 2 0 8 0
art_node 16 682 0 642 1 0 1 1 0 8 0
sysvmsgpl 40 44 0 28 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 179 0 169 1 0 1 1 0 8 0
shmpl 112 80 0 10 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 4427 0 2966 48 0 48 48 0 8 0
ffsino 272 4427 0 2966 98 0 98 98 0 8 0
nchpl 144 7899 0 6277 61 0 61 61 0 8 0
uvmvnodes 72 5456 0 0 100 0 100 100 0 8 0
vnodes 200 5456 0 0 288 0 288 288 0 8 0
namei 1024 31096 0 31096 3 2 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 19773 0 19773 12 11 1 6 0 8 1
sigapl 432 2967 0 2953 7 5 2 3 0 8 0
futexpl 56 23002 0 23002 2 1 1 1 0 8 1
knotepl 112 1739 0 1720 1 0 1 1 0 8 0
kqueuepl 104 545 0 543 1 0 1 1 0 8 0
pipepl 112 1816 0 1797 6 5 1 2 0 8 0
fdescpl 488 2968 0 2953 3 0 3 3 0 8 1
filepl 152 17156 0 17060 10 5 5 7 0 8 1
lockfpl 104 501 0 501 4 3 1 1 0 8 1
lockfspl 48 162 0 162 4 3 1 1 0 8 1
sessionpl 112 75 0 65 1 0 1 1 0 8 0
pgrppl 48 108 0 98 1 0 1 1 0 8 0
ucredpl 96 5068 0 5059 1 0 1 1 0 8 0
zombiepl 144 2953 0 2951 2 1 1 1 0 8 0
processpl 888 2984 0 2951 4 0 4 4 0 8 0
procpl 600 7426 0 7383 5 1 4 5 0 8 0
srpgc 64 348 0 348 4 3 1 1 0 8 1
sosppl 128 36 0 36 10 10 0 1 0 8 0
sockpl 384 2885 0 2868 5 2 3 4 0 8 1
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 10 0 0 1 0 1 1 0 8 0
mcl8k 8192 7 0 0 1 0 1 1 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 117 0 0 14 0 14 14 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 264 0 0 12 0 12 12 0 8 0
bufpl 256 8507 0 1502 438 0 438 438 0 8 0
anonpl 16 270980 0 265612 78 48 30 42 0 125 2
amapchunkpl 152 24310 0 24219 43 34 9 11 0 158 5
amappl16 192 10022 0 9714 49 31 18 28 0 8 2
amappl15 184 306 0 305 1 0 1 1 0 8 0
amappl14 176 700 0 697 2 1 1 1 0 8 0
amappl13 168 457 0 457 6 5 1 1 0 8 1
amappl12 160 428 0 425 1 0 1 1 0 8 0
amappl11 152 572 0 553 1 0 1 1 0 8 0
amappl10 144 747 0 744 2 1 1 1 0 8 0
amappl9 136 1505 0 1502 1 0 1 1 0 8 0
amappl8 128 870 0 850 1 0 1 1 0 8 0
amappl7 120 722 0 712 1 0 1 1 0 8 0
amappl6 112 387 0 375 1 0 1 1 0 8 0
amappl5 104 839 0 829 1 0 1 1 0 8 0
amappl4 96 3111 0 3086 1 0 1 1 0 8 0
amappl3 88 617 0 607 1 0 1 1 0 8 0
amappl2 80 18574 0 18506 4 2 2 3 0 8 0
amappl1 72 87421 0 86975 23 13 10 19 0 8 0
amappl 80 8586 0 8549 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 81 0 10 2 0 2 2 0 8 0
uaddrrnd 24 2968 0 2952 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2968 0 2952 1 0 1 1 0 8 0
vmmpekpl 168 27848 0 27819 2 0 2 2 0 8 0
vmmpepl 168 334107 0 332701 129 56 73 76 0 357 8
vmsppl 360 2967 0 2952 2 0 2 2 0 8 0
pdppl 4096 5944 0 5904 6 0 6 6 0 8 1
pvpl 32 823355 0 814790 194 105 89 109 0 265 12
pmappl 232 2967 0 2952 8 6 2 2 0 8 1
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 598 0 6 17 0 17 17 0 8 0