witness: lock order reversal: 1st 0xffffffff82cc8bd0 &sched_lock (&sched_lock) 2nd 0xffff800021211a40 &pr->ps_mtx (&pr->ps_mtx) lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline] #0 __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline] #0 __mp_lock+0xa2 sys/kern/kern_lock.c:142 #1 donice+0x178 sys/kern/kern_resource.c:218 #2 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #2 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #3 Xsyscall+0x128 lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at: #0 mtx_enter+0x3e sys/kern/kern_lock.c:265 #1 single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] #1 single_thread_set+0x35a sys/kern/kern_sig.c:2155 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Stopped at db_enter+0x1c: 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+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800021211a40,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800021211a40,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800021211a30) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211ee2b8,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211ee2b8,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211ee2b8,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211ee2b8,6,ffff80002e46d208) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211ee2b8) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002e46d340) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e46d340) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcb672047e20, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff80002e46cf10 rbx 0x3 rdx 0xffff800000d02c80 rcx 0xffff8000211ee2b8 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff80002e46ce80 r9 0x8080808080808080 r10 0xbbc9c06a10088a6 r11 0xde968525c673f702 r12 0xfffffd8003a0a7a0 r13 0 r14 0xfffffd80039f6950 r15 0xfffffd80031c7bc0 rip 0xffffffff81b6e27c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002e46cf00 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=268521 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800021262d68,0xffffffff82c90e98 process=0xffff800021211930 user=0xffff80002e468000, vmspace=0xfffffd806baaf928 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 81111 147186 58093 32767 2 0x10 syz-executor.6 81111 93870 58093 32767 7 0x4000010 syz-executor.6 89545 70032 4585 32767 4 0x582010 syz-executor.0 *89545 268521 4585 32767 7 0x4502010 syz-executor.0 26715 2931 65796 32767 2 0x10 syz-executor.3 26715 276687 65796 32767 3 0x4000090 fsleep syz-executor.3 95310 496029 85743 32767 2 0x10 syz-executor.2 95310 72090 85743 32767 3 0x4000090 fsleep syz-executor.2 95310 79103 85743 32767 3 0x4000090 fsleep syz-executor.2 7248 23162 38175 32767 2 0x10 syz-executor.1 63546 60845 16416 32767 2 0x10 syz-executor.5 63546 205739 16416 32767 2 0x4000010 syz-executor.5 8720 426326 99377 32767 2 0x10 syz-executor.7 8720 264918 99377 32767 3 0x4000090 netcon2 syz-executor.7 85743 94005 67677 32767 3 0x90 nanoslp syz-executor.2 67677 283106 45633 0 3 0x82 wait syz-executor.2 4585 202373 72744 32767 3 0x90 nanoslp syz-executor.0 72744 510972 45633 0 3 0x82 wait syz-executor.0 38175 170483 60307 32767 3 0x90 nanoslp syz-executor.1 60307 285163 45633 0 3 0x82 wait syz-executor.1 65796 259404 64355 32767 3 0x90 nanoslp syz-executor.3 64355 393305 45633 0 3 0x82 wait syz-executor.3 58093 396787 14850 32767 3 0x90 nanoslp syz-executor.6 14850 357182 45633 0 3 0x82 wait syz-executor.6 16416 341777 93096 32767 3 0x90 nanoslp syz-executor.5 93096 269603 45633 0 3 0x82 wait syz-executor.5 14382 251957 45633 0 3 0x82 wait syz-executor.4 99377 423521 74159 32767 2 0x10 syz-executor.7 74159 411385 45633 0 3 0x82 wait syz-executor.7 74148 221750 0 0 3 0x14200 bored sosplice 45633 74081 5201 0 3 0x2000082 wait syz-fuzzer 45633 34988 5201 0 3 0x6000082 nanoslp syz-fuzzer 45633 276996 5201 0 3 0x6000082 wait syz-fuzzer 45633 109473 5201 0 3 0x6000082 wait syz-fuzzer 45633 278161 5201 0 3 0x6000082 wait syz-fuzzer 45633 96994 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 509990 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 308854 5201 0 3 0x6000082 kqread syz-fuzzer 45633 268327 5201 0 3 0x6000082 wait syz-fuzzer 45633 24500 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 243654 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 470106 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 178118 5201 0 3 0x6000082 wait syz-fuzzer 45633 263746 5201 0 3 0x6000082 wait syz-fuzzer 45633 394426 5201 0 3 0x6000082 thrsleep syz-fuzzer 45633 204990 5201 0 3 0x6000082 wait syz-fuzzer 5201 88027 37788 0 3 0x10008a sigsusp ksh 37788 437271 39432 0 3 0x9a kqread sshd 95603 359731 1 0 3 0x100083 ttyin getty 39432 388275 1 0 3 0x88 kqread sshd 91357 6849 38737 73 3 0x1100090 kqread syslogd 38737 236697 1 0 3 0x100082 netio syslogd 16022 335561 1 0 3 0x100080 kqread resolvd 19782 77732 92798 77 3 0x100092 kqread dhcpleased 6145 225608 92798 77 3 0x100092 kqread dhcpleased 92798 306779 1 0 3 0x80 kqread dhcpleased 30636 108424 0 0 3 0x14200 bored smr 85258 451323 0 0 2 0x14200 zerothread 68558 511316 0 0 3 0x14200 aiodoned aiodoned 31797 143336 0 0 3 0x14200 syncer update 96438 430272 0 0 3 0x14200 cleaner cleaner 73347 24784 0 0 3 0x14200 reaper reaper 41697 66695 0 0 3 0x14200 pgdaemon pagedaemon 34845 523275 0 0 3 0x14200 bored viomb 51199 37086 0 0 3 0x40014200 acpi0 acpi0 38296 511206 0 0 3 0x40014200 idle1 67667 190497 0 0 3 0x14200 bored softnet3 4859 213893 0 0 3 0x14200 bored softnet2 4857 352655 0 0 3 0x14200 bored softnet1 73300 136040 0 0 3 0x14200 bored softnet0 4104 314926 0 0 3 0x14200 bored systqmp 70457 102092 0 0 3 0x14200 bored systq 66340 253040 0 0 3 0x40014200 bored softclock 1959 3638 0 0 3 0x40014200 idle0 1 126344 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82cc9298) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 uvm_pmr_getpages+0xeac sys/uvm/uvm_pmemrange.c:1205 #4 uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 #5 uvm_fault_lower+0x1ab #6 uvm_fault+0x238 #7 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82cc8bd0) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Process 81111 (syz-executor.6) thread 0xffff8000212632b8 (93870) exclusive rwlock amaplk r = 0 (0xfffffd806b2b8668) #0 witness_lock+0x447 #1 uvm_fault_check+0x41a sys/uvm/uvm_fault.c:782 #2 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #3 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #4 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806585add0) #0 witness_lock+0x447 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1785 #2 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 Process 89545 (syz-executor.0) thread 0xffff8000211ee2b8 (268521) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ca0228) #0 witness_lock+0x447 #1 postsig+0x49e sys/kern/kern_sig.c:1500 #2 userret+0x16e sys/kern/kern_sig.c:1987 #3 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #3 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #4 Xsyscall+0x128 exclusive sched_lock &sched_lock r = 0 (0xffffffff82cc8bd0) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 6412K 6420K 78643K 11382 0 pcb 13 12K 14K 78643K 17 0 rtable 246 7K 7K 78643K 1887 0 pf 29 8K 8K 78643K 87 0 ifaddr 44 15K 16K 78643K 166 0 ifgroup 50 2K 2K 78643K 166 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 118 0 ioctlops 0 0K 2K 78643K 229 0 iov 0 0K 32K 78643K 734 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 3227 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 177 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 19 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 117K 78643K 12507 0 sigio 0 0K 0K 78643K 1415 0 proc 56 78K 103K 78643K 1991 0 subproc 104 6K 6K 78643K 481 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2051 0 in_multi 99 7K 7K 78643K 549 0 ether_multi 1 0K 0K 78643K 21 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 1K 78643K 2665 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 493 100K 113K 78643K 123662 0 UVM aobj 131 6K 6K 78643K 173 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 337 0 NDP 11 0K 2K 78643K 114 0 temp 74 5920K 6000K 78643K 34233 0 kqueue 12 18K 28K 78643K 1036 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 11881 0 11876 62 59 3 9 0 8 2 rtentry 112 456 0 340 4 0 4 4 0 8 0 unpcb 144 12361 0 12348 107 101 6 10 0 8 5 syncache 304 156 0 156 21 21 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 333 0 333 21 21 0 1 0 8 0 tcpcb 808 4001 0 3992 118 116 2 18 0 8 0 arp 120 79 0 61 1 0 1 1 0 8 0 ipq 40 20 0 20 6 6 0 1 0 8 0 ipqe 40 108 0 108 6 6 0 1 0 8 0 inpcb 368 9501 0 9488 129 122 7 17 0 8 5 nd6 136 134 0 104 3 1 2 2 0 8 0 kcovpl 48 37 0 29 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1820 0 1341 32 2 30 31 0 8 0 art_table 32 1821 0 1341 4 0 4 4 0 8 0 art_node 16 455 0 349 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 9 0 9 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 170 0 42 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 16872 0 15425 91 0 91 91 0 8 0 ffsino 272 16872 0 15425 97 0 97 97 0 8 0 nchpl 144 33874 0 32231 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 111421 0 111421 7 6 1 2 0 8 1 percpumem 16 72 0 29 1 0 1 1 0 8 0 kstatmem 264 80 0 58 2 0 2 2 0 8 0 scxspl 216 92776 0 92776 37 36 1 8 1 8 1 plimitpl 152 1870 0 1847 14 13 1 2 0 8 0 sigapl 424 12744 0 12690 7 0 7 7 0 8 0 futexpl 64 99850 0 99847 4 3 1 1 0 8 0 knotepl 120 781 0 0 11 0 11 11 0 8 0 kqueuepl 216 2716 0 2708 53 52 1 5 0 8 0 pipepl 320 2735 0 2707 62 59 3 11 0 8 0 fdescpl 496 12726 0 12690 7 2 5 6 0 8 0 filepl 152 87693 0 87456 154 139 15 21 0 8 5 lockfpl 104 3463 0 3461 5 4 1 2 0 8 0 lockfspl 48 946 0 944 1 0 1 1 0 8 0 sessionpl 144 52 0 36 1 0 1 1 0 8 0 pgrppl 48 170 0 154 1 0 1 1 0 8 0 ucredpl 104 9369 0 9351 1 0 1 1 0 8 0 zombiepl 144 12691 0 12690 2 1 1 1 0 8 0 processpl 1072 12744 0 12690 4 0 4 4 0 8 0 procpl 680 34589 0 34513 30 22 8 8 0 8 1 sosppl 168 149 0 149 9 9 0 1 0 8 0 sockpl 488 34269 0 34237 610 589 21 41 0 8 16 mcl64k 65536 35 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 57 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 420 0 0 37 16 21 37 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 2224 0 0 101 0 101 101 0 8 0 bufpl 288 21439 0 15113 453 1 452 453 0 8 0 anonpl 24 1284383 0 1272633 178 84 94 96 0 186 7 amapchunkpl 152 389068 0 388158 86 47 39 45 0 158 1 amappl16 200 27317 0 27026 162 138 24 29 0 8 8 amappl15 192 13 0 13 2 2 0 1 0 8 0 amappl14 184 262 0 245 2 0 2 2 0 8 0 amappl13 176 32 0 31 4 3 1 1 0 8 0 amappl12 168 13781 0 13746 2 0 2 2 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 63 0 50 1 0 1 1 0 8 0 amappl9 144 340 0 340 19 18 1 1 0 8 1 amappl8 136 978 0 769 9 1 8 8 0 8 0 amappl7 128 113 0 98 1 0 1 1 0 8 0 amappl6 120 538 0 511 1 0 1 1 0 8 0 amappl5 112 620 0 610 1 0 1 1 0 8 0 amappl4 104 967 0 928 2 0 2 2 0 8 0 amappl3 96 76441 0 76347 3 0 3 3 0 8 0 amappl2 88 13500 0 13420 3 1 2 3 0 8 0 amappl1 80 54331 0 53798 22 9 13 22 0 8 0 amappl 88 122445 0 122167 9 1 8 8 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 72 172 0 42 3 0 3 3 0 8 0 uaddrrnd 24 12726 0 12690 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12726 0 12690 1 0 1 1 0 8 0 vmmpekpl 168 100050 0 99983 4 0 4 4 0 8 0 vmmpepl 168 750831 0 748256 237 119 118 130 0 357 0 vmsppl 464 12725 0 12690 7 2 5 6 0 8 0 rwobjpl 56 190533 0 183019 120 11 109 109 0 8 0 pdppl 4096 25460 0 25380 544 462 82 92 0 8 2 pvpl 32 3544085 0 3525950 472 299 173 339 0 265 13 pmappl 248 12725 0 12690 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1661 0 752 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c05ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cc89c8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cc89c8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 wakeup_n(ffffffff82cc9104,ffffffff) at wakeup_n+0x37 sys/kern/kern_synch.c:541 uvm_pmr_getpages(1,0,0,1,0,1,c93fc292b0b6549b,fffffd807e139c60) at uvm_pmr_getpages+0xeef sys/uvm/uvm_pmemrange.c:1207 uvm_pagealloc(0,0,fffffd807e139c60,2) at uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 uvm_fault_lower(ffff8000212c0e10,ffff8000212c0e48,ffff8000212c0d90,0) at uvm_fault_lower+0x1ab uvm_fault(fffffd806585acd8,f7707974000,0,2) at uvm_fault+0x238 upageflttrap(ffff8000212c0f90,f7707974538) at upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000212c0f90) at usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800021211a40,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800021211a40,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800021211a30) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211ee2b8,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211ee2b8,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211ee2b8,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211ee2b8,6,ffff80002e46d208) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211ee2b8) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002e46d340) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e46d340) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcb672047e20, count: -9