witness: lock order reversal:
1st 0xffff800020b8c450 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff82388e00 &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 exit1+0x732 sys/kern/kern_exit.c:300
#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(ffffffff82388e00,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff82388e00,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1084
__mp_lock(ffffffff82388bf8) at __mp_lock+0xa1
schedclock(ffff800020b38bd0) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800022e2b470) 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,ffff800020b8c440,0,ffff800020b8c390,2000) at Xresume_lapic_ltimer+0x26
exit1(ffff800020b38bd0,0,1) at exit1+0x732 sys/kern/kern_exit.c:300
sys_exit(ffff800020b38bd0,ffff800022e2b5e0,ffff800022e2b650) at sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800022e2b6c0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800022e2b6c0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(0,1,0,1,0,7f7ffffece14) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffecde0, count: -11
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff821ba590 __sancov_gen_cov_switch_values.122
rbp 0xffff800022e2b270
rbx 0x3
rdx 0xffff800020aa8ff0
rcx 0x3
rax 0xffff800020aa8ff0
r8 0xffffffff812ec145 witness_checkorder+0xfd5
r9 0x5
r10 0x3
r11 0x22da8391706daa3
r12 0xfffffd8002661340
r13 0xc
r14 0xffffffff822ea790 w_lodata+0x4b8a0
r15 0xffffffff822f5f20 w_lodata+0x57030
rip 0xffffffff81365a78 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022e2b260
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=297356 stat=dead
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020b8c390 user=0xffff800022e26000, vmspace=0xfffffd807f00b000
estcpu=36, cpticks=5, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
72813 522837 61309 0 2 0 syz-executor.1
72813 41388 61309 0 3 0x4000080 ttyin syz-executor.1
72813 132980 61309 0 3 0x4000080 fsleep syz-executor.1
23766 252028 1 0 3 0x100083 ttyin getty
90094 332553 0 0 3 0x14200 bored sosplice
94833 458696 73970 0 3 0x82 nanosleep syz-executor.0
61309 177014 73970 0 3 0x82 nanosleep syz-executor.1
73970 37892 50243 0 3 0x82 thrsleep syz-fuzzer
73970 422819 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 297606 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 470818 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 13315 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 182900 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 455810 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 407289 50243 0 3 0x4000082 thrsleep syz-fuzzer
73970 313829 50243 0 3 0x4000082 kqread syz-fuzzer
73970 121776 50243 0 3 0x4000082 thrsleep syz-fuzzer
50243 243797 8100 0 3 0x10008a pause ksh
8100 176845 90834 0 3 0x92 select sshd
90834 437969 1 0 3 0x80 select sshd
20731 277544 88820 74 3 0x100092 bpf pflogd
88820 332829 1 0 3 0x80 netio pflogd
6868 474217 2864 73 7 0x100090 syslogd
2864 261205 1 0 3 0x100082 netio syslogd
19686 154747 1 77 3 0x100090 poll dhclient
44639 95017 1 0 3 0x80 poll dhclient
67752 421024 0 0 2 0x14200 zerothread
81613 234256 0 0 3 0x14200 aiodoned aiodoned
84225 317789 0 0 3 0x14200 syncer update
14113 447148 0 0 3 0x14200 cleaner cleaner
28756 2948 0 0 3 0x14200 reaper reaper
43062 54556 0 0 3 0x14200 pgdaemon pagedaemon
25206 492771 0 0 3 0x14200 bored crynlk
38092 275103 0 0 3 0x14200 bored crypto
32205 512864 0 0 3 0x40014200 acpi0 acpi0
79742 388088 0 0 3 0x40014200 idle1
80842 323779 0 0 3 0x14200 bored softnet
75574 476978 0 0 3 0x14200 bored systqmp
39226 112437 0 0 3 0x14200 bored systq
40836 52424 0 0 3 0x40014200 bored softclock
92466 281830 0 0 3 0x40014200 idle0
94658 372138 0 0 3 0x14200 bored smr
1 283649 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 (0xffff800020b8c450)
#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 9529 6551K 6680K 78643K 11865 0 0
pcb 25 9K 11K 78643K 290 0 0
rtable 109 4K 4K 78643K 390 0 0
ifaddr 59 13K 13K 78643K 113 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1491 0 0
iov 0 0K 16K 78643K 77 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1210 76K 76K 78643K 1948 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 10 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 0K 0K 78643K 428 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 5 13K 25K 78643K 801 0 0
sigio 0 0K 0K 78643K 12 0 0
proc 54 51K 83K 78643K 527 0 0
subproc 32 2K 2K 78643K 68 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 41 0 0
in_multi 33 2K 2K 78643K 66 0 0
ether_multi 1 0K 0K 78643K 3 0 0
mrt 0 0K 0K 78643K 2 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 66 291K 291K 78643K 66 0 0
exec 0 0K 1K 78643K 260 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 95 21K 22K 78643K 3525 0 0
UVM aobj 25 2K 2K 78643K 27 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 27 0 0
NDP 12 0K 0K 78643K 32 0 0
temp 156 2727K 2793K 78643K 5663 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 10 0 4 1 0 1 1 0 8 0
inpcbpl 280 269 0 262 1 0 1 1 0 8 0
plimitpl 152 32 0 24 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 71 0 27 2 0 2 2 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpqe 32 7 0 7 1 1 0 1 0 8 0
tcpcb 544 103 0 99 1 0 1 1 0 8 0
nd6 48 12 0 6 1 0 1 1 0 8 0
ppxss 1128 9 0 9 6 6 0 1 0 8 0
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 16 0 14 1 0 1 1 0 8 0
pfstkey 112 16 0 14 1 0 1 1 0 8 0
pfstate 328 16 0 14 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 256 277 0 88 12 0 12 12 0 8 0
art_table 32 278 0 88 2 0 2 2 0 8 0
art_node 16 66 0 26 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0
semapl 112 426 0 416 1 0 1 1 0 8 0
shmpl 112 25 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 2768 0 1335 47 0 47 47 0 8 0
ffsino 272 2768 0 1335 96 0 96 96 0 8 0
nchpl 144 4005 0 2375 61 0 61 61 0 8 0
uvmvnodes 72 3144 0 0 58 0 58 58 0 8 0
vnodes 200 3144 0 0 166 0 166 166 0 8 0
namei 1024 12903 0 12903 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scsiplug 64 2 0 2 2 2 0 1 0 8 0
scxspl 192 10515 0 10514 15 14 1 6 0 8 0
sigapl 432 996 0 980 3 1 2 3 0 8 0
futexpl 56 9367 0 9366 1 0 1 1 0 8 0
knotepl 112 172 0 153 1 0 1 1 0 8 0
kqueuepl 104 101 0 99 1 0 1 1 0 8 0
pipepl 112 422 0 403 2 1 1 1 0 8 0
fdescpl 488 997 0 981 3 0 3 3 0 8 0
filepl 152 6260 0 6158 5 0 5 5 0 8 0
lockfpl 104 184 0 184 9 8 1 1 0 8 1
lockfspl 48 65 0 65 9 8 1 1 0 8 1
sessionpl 112 21 0 10 1 0 1 1 0 8 0
pgrppl 48 29 0 18 1 0 1 1 0 8 0
ucredpl 96 2539 0 2530 1 0 1 1 0 8 0
zombiepl 144 981 0 980 2 1 1 1 0 8 0
processpl 888 1013 0 980 4 0 4 4 0 8 0
procpl 600 2679 0 2635 5 1 4 5 0 8 0
srpgc 64 12 0 12 1 1 0 1 0 8 0
sosppl 128 5 0 5 2 2 0 1 0 8 0
sockpl 384 510 0 491 5 2 3 4 0 8 1
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 7 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 5 0 0 1 0 1 1 0 8 0
mcl2k 2048 119 0 0 14 0 14 14 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 184 0 0 10 0 10 10 0 8 0
bufpl 256 7153 0 1191 373 0 373 373 0 8 0
anonpl 16 89036 0 79012 67 26 41 57 0 125 0
amapchunkpl 152 5378 0 5277 7 2 5 6 0 158 0
amappl16 192 4211 0 3677 45 18 27 39 0 8 0
amappl15 184 262 0 261 1 0 1 1 0 8 0
amappl14 176 534 0 530 2 1 1 1 0 8 0
amappl13 168 2 0 2 1 1 0 1 0 8 0
amappl12 160 7 0 6 1 0 1 1 0 8 0
amappl11 152 66 0 48 1 0 1 1 0 8 0
amappl10 144 83 0 80 1 0 1 1 0 8 0
amappl9 136 621 0 618 1 0 1 1 0 8 0
amappl8 128 172 0 156 1 0 1 1 0 8 0
amappl7 120 46 0 41 1 0 1 1 0 8 0
amappl6 112 59 0 53 1 0 1 1 0 8 0
amappl5 104 137 0 122 1 0 1 1 0 8 0
amappl4 96 1153 0 1123 1 0 1 1 0 8 0
amappl3 88 691 0 679 1 0 1 1 0 8 0
amappl2 80 7174 0 7093 4 2 2 3 0 8 0
amappl1 72 31837 0 31379 25 15 10 20 0 8 0
amappl 80 2956 0 2916 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 26 0 2 1 0 1 1 0 8 0
uaddrrnd 24 997 0 980 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 997 0 980 1 0 1 1 0 8 0
vmmpekpl 168 10514 0 10478 2 0 2 2 0 8 0
vmmpepl 168 112873 0 111194 123 49 74 88 0 357 0
vmsppl 360 996 0 980 2 0 2 2 0 8 0
pdppl 4096 2001 0 1960 6 0 6 6 0 8 0
pvpl 32 293386 0 279548 172 59 113 144 0 265 1
pmappl 232 996 0 980 3 2 1 2 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 526 0 4 15 0 15 15 0 8 0