witness: lock order reversal: 1st 0xffffffff82cc8bd0 &sched_lock (&sched_lock) 2nd 0xffff8000ffff8978 &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(ffff8000ffff8978,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff8978,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff8968) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002120c2c0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002120c2c0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002120c2c0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002120c2c0,6,ffff8000246e5d48) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002120c2c0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff8000246e5e80) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff8000246e5e80) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6c7f01a8f10, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff8000246e5a50 rbx 0x3 rdx 0xffff800000cf9980 rcx 0xffff80002120c2c0 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff8000246e59c0 r9 0x8080808080808080 r10 0xc0af8b74e94cbfc8 r11 0x8614c1f9aef588 r12 0xfffffd8003a0a850 r13 0 r14 0xfffffd80039f86e0 r15 0xfffffd80031c7bc0 rip 0xffffffff81b6e27c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000246e5a40 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.3) pid=508782 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000212d3a98,0xffff80002120c820 process=0xffff8000ffff8868 user=0xffff8000246e0000, vmspace=0xfffffd8008a12000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52583 250255 8195 32767 2 0x10 syz-executor.6 89079 32358 62819 32767 7 0x10 syz-executor.1 41304 12702 59174 32767 2 0x10 syz-executor.5 78380 181750 57932 32767 4 0x582010 syz-executor.3 *78380 508782 57932 32767 7 0x4502010 syz-executor.3 88353 53637 22991 32767 2 0x10 syz-executor.4 88353 103182 22991 32767 2 0x4000010 syz-executor.4 97079 67214 35277 32767 3 0x90 nanoslp syz-executor.2 97079 255480 35277 32767 3 0x4000090 fsleep syz-executor.2 97079 131608 35277 32767 3 0x4000090 netcon2 syz-executor.2 97079 138965 35277 32767 3 0x4000090 fsleep syz-executor.2 22991 447370 54979 32767 3 0x90 nanoslp syz-executor.4 54979 80123 79820 0 3 0x82 wait syz-executor.4 94135 401328 17939 32767 3 0x90 piperd syz-executor.0 17939 103346 79820 0 3 0x82 wait syz-executor.0 57932 39483 17671 32767 3 0x90 nanoslp syz-executor.3 17671 194179 79820 0 3 0x82 wait syz-executor.3 62819 243630 57950 32767 3 0x90 nanoslp syz-executor.1 57950 228671 79820 0 3 0x82 wait syz-executor.1 2720 367730 62293 32767 3 0x90 piperd syz-executor.7 62293 186892 79820 0 3 0x82 wait syz-executor.7 59174 522298 62217 32767 3 0x90 nanoslp syz-executor.5 62217 64684 79820 0 3 0x82 wait syz-executor.5 35277 187680 18166 32767 3 0x90 nanoslp syz-executor.2 18166 118058 79820 0 3 0x82 wait syz-executor.2 53878 128338 0 0 3 0x14200 bored sosplice 8195 151230 54165 32767 2 0x10 syz-executor.6 54165 522762 79820 0 3 0x82 wait syz-executor.6 79820 106160 49445 0 3 0x2000082 wait syz-fuzzer 79820 55214 49445 0 3 0x6000082 nanoslp syz-fuzzer 79820 455265 49445 0 3 0x6000082 wait syz-fuzzer 79820 518121 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 259922 49445 0 3 0x6000082 kqread syz-fuzzer 79820 411103 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 38918 49445 0 3 0x6000082 wait syz-fuzzer 79820 10452 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 327152 49445 0 3 0x6000082 wait syz-fuzzer 79820 298021 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 100945 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 346550 49445 0 3 0x6000082 wait syz-fuzzer 79820 184668 49445 0 3 0x6000082 wait syz-fuzzer 79820 251459 49445 0 3 0x6000082 thrsleep syz-fuzzer 79820 175849 49445 0 3 0x6000082 wait syz-fuzzer 79820 303437 49445 0 3 0x6000082 wait syz-fuzzer 49445 219583 85052 0 3 0x10008a sigsusp ksh 85052 335580 78254 0 3 0x9a kqread sshd 87045 507748 1 0 3 0x100083 ttyin getty 78254 333695 1 0 3 0x88 kqread sshd 76631 259184 75943 73 3 0x1100090 kqread syslogd 75943 180928 1 0 3 0x100082 netio syslogd 36361 459371 1 0 3 0x100080 kqread resolvd 41356 176212 21155 77 3 0x100092 kqread dhcpleased 42237 273417 21155 77 3 0x100092 kqread dhcpleased 21155 451604 1 0 3 0x80 kqread dhcpleased 63880 53538 0 0 3 0x14200 bored smr 74060 221182 0 0 2 0x14200 zerothread 25698 302990 0 0 3 0x14200 aiodoned aiodoned 34798 208432 0 0 3 0x14200 syncer update 6622 225168 0 0 3 0x14200 cleaner cleaner 31389 221148 0 0 3 0x14200 reaper reaper 2818 88695 0 0 3 0x14200 pgdaemon pagedaemon 88568 135055 0 0 3 0x14200 bored viomb 1036 15580 0 0 3 0x40014200 acpi0 acpi0 7965 462366 0 0 3 0x40014200 idle1 28092 366556 0 0 3 0x14200 bored softnet3 60295 431684 0 0 3 0x14200 bored softnet2 27859 198404 0 0 3 0x14200 bored softnet1 99003 496299 0 0 3 0x14200 bored softnet0 2302 358768 0 0 3 0x14200 bored systqmp 77337 385822 0 0 3 0x14200 bored systq 40835 220905 0 0 3 0x40014200 bored softclock 49347 279739 0 0 3 0x40014200 idle0 1 173135 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 pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1209 #6 pmap_enter+0x2be sys/arch/amd64/amd64/pmap.c:2716 #7 uvm_fault_upper_lookup+0x2c0 sys/uvm/uvm_fault.c:895 #8 uvm_fault+0x129 sys/uvm/uvm_fault.c:605 #9 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #10 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #11 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806bae0020) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 pmap_enter+0x1c3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:423 [inline] #3 pmap_enter+0x1c3 sys/arch/amd64/amd64/pmap.c:2710 #4 uvm_fault_upper_lookup+0x2c0 sys/uvm/uvm_fault.c:895 #5 uvm_fault+0x129 sys/uvm/uvm_fault.c:605 #6 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #8 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 89079 (syz-executor.1) thread 0xffff8000212d3a98 (32358) exclusive rwlock amaplk r = 0 (0xfffffd8067f6a908) #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 (0xfffffd806bc0c4b0) #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 78380 (syz-executor.3) thread 0xffff80002120c2c0 (508782) 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 10216 6412K 6420K 78643K 11338 0 pcb 13 12K 14K 78643K 17 0 rtable 244 6K 7K 78643K 1043 0 pf 29 8K 8K 78643K 57 0 ifaddr 44 15K 15K 78643K 104 0 ifgroup 50 2K 2K 78643K 106 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 88 0 ioctlops 0 0K 2K 78643K 117 0 iov 0 0K 18K 78643K 571 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 3063 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 170 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1072 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 113K 78643K 7486 0 sigio 0 0K 0K 78643K 149 0 proc 56 78K 103K 78643K 1267 0 subproc 104 6K 6K 78643K 286 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 6241 0 in_multi 99 7K 7K 78643K 306 0 ether_multi 1 0K 0K 78643K 7 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 235 1049K 1049K 78643K 235 0 exec 0 0K 1K 78643K 1280 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 416 91K 106K 78643K 75011 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 213 0 NDP 11 0K 2K 78643K 69 0 temp 74 5920K 6000K 78643K 22333 0 kqueue 13 20K 24K 78643K 611 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 120 238 0 235 1 0 1 1 0 8 0 rtentry 112 280 0 165 4 0 4 4 0 8 0 unpcb 144 4679 0 4666 64 55 9 10 0 8 8 syncache 304 86 0 86 12 12 0 1 0 8 0 tcpqe 32 320 0 320 9 9 0 1 0 8 0 tcpcb 808 2940 0 2926 88 85 3 16 0 8 1 arp 120 47 0 28 1 0 1 1 0 8 0 ipq 40 11 0 11 4 4 0 1 0 8 0 ipqe 40 59 0 59 4 4 0 1 0 8 0 inpcb 368 10316 0 10292 124 119 5 20 0 8 2 nd6 136 80 0 52 3 1 2 2 0 8 0 kcovpl 48 22 0 14 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1129 0 659 34 4 30 30 0 8 0 art_table 32 1130 0 659 4 0 4 4 0 8 0 art_node 16 279 0 174 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0 semapl 112 1070 0 1060 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11338 0 9886 92 0 92 92 0 8 0 ffsino 272 11338 0 9886 98 0 98 98 0 8 0 nchpl 144 21358 0 19720 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 73093 0 73093 6 5 1 2 0 8 1 percpumem 16 57 0 14 1 0 1 1 0 8 0 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scxspl 216 61527 0 61527 26 25 1 8 1 8 1 plimitpl 152 1145 0 1122 13 11 2 2 0 8 1 sigapl 424 7754 0 7701 7 0 7 7 0 8 0 futexpl 64 58606 0 58604 5 4 1 1 0 8 0 knotepl 120 468 0 0 11 0 11 11 0 8 0 kqueuepl 216 1661 0 1652 38 37 1 7 0 8 0 pipepl 320 1326 0 1298 38 35 3 8 0 8 0 fdescpl 496 7736 0 7701 7 2 5 6 0 8 0 filepl 152 49319 0 49082 117 99 18 21 0 8 8 lockfpl 104 4092 0 4089 1 0 1 1 0 8 0 lockfspl 48 630 0 627 1 0 1 1 0 8 0 sessionpl 144 37 0 21 1 0 1 1 0 8 0 pgrppl 48 144 0 128 1 0 1 1 0 8 0 ucredpl 104 8343 0 8325 1 0 1 1 0 8 0 zombiepl 144 7701 0 7701 1 0 1 1 0 8 1 processpl 1072 7754 0 7701 4 0 4 4 0 8 0 procpl 680 20891 0 20818 22 14 8 8 0 8 1 sosppl 168 100 0 100 10 10 0 1 0 8 0 sockpl 488 15545 0 15511 301 288 13 36 0 8 7 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 0 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 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 4 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 382 0 0 39 15 24 39 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1930 0 0 103 0 103 103 0 8 0 bufpl 288 14145 0 7819 454 2 452 453 0 8 0 anonpl 24 876169 0 865041 191 96 95 124 0 186 4 amapchunkpl 152 237295 0 236455 90 51 39 49 0 158 1 amappl16 200 20406 0 20111 111 94 17 29 0 8 0 amappl15 192 16 0 16 1 1 0 1 0 8 0 amappl14 184 195 0 181 2 1 1 2 0 8 0 amappl13 176 12 0 12 1 1 0 1 0 8 0 amappl12 168 8598 0 8557 3 1 2 3 0 8 0 amappl11 160 49 0 38 1 0 1 1 0 8 0 amappl10 152 44 0 30 1 0 1 1 0 8 0 amappl9 144 286 0 285 1 0 1 1 0 8 0 amappl8 136 570 0 427 5 0 5 5 0 8 0 amappl7 128 98 0 84 2 0 2 2 0 8 0 amappl6 120 404 0 377 1 0 1 1 0 8 0 amappl5 112 390 0 379 1 0 1 1 0 8 0 amappl4 104 764 0 719 2 0 2 2 0 8 0 amappl3 96 46690 0 46611 3 0 3 3 0 8 0 amappl2 88 8316 0 8243 3 1 2 3 0 8 0 amappl1 80 35996 0 35471 22 10 12 22 0 8 0 amappl 88 74100 0 73854 7 0 7 7 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 7736 0 7701 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7736 0 7701 1 0 1 1 0 8 0 vmmpekpl 168 63300 0 63234 4 0 4 4 0 8 0 vmmpepl 168 465748 0 463315 208 84 124 125 0 357 8 vmsppl 464 7735 0 7701 7 2 5 6 0 8 0 rwobjpl 56 125345 0 117907 116 8 108 109 0 8 0 pdppl 4096 15480 0 15402 341 259 82 90 0 8 4 pvpl 32 2405241 0 2387949 472 250 222 335 0 265 58 pmappl 248 7735 0 7701 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1421 0 506 27 0 27 27 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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cc89c8) at __mp_lock+0x129 sys/kern/kern_lock.c:147 wakeup_n(ffffffff82cc9104,ffffffff) at wakeup_n+0x37 sys/kern/kern_synch.c:541 uvm_pmr_getpages(1,0,0,1,0,1,4f7f7bad36b88f34,0) at uvm_pmr_getpages+0xeef sys/uvm/uvm_pmemrange.c:1207 uvm_pagealloc(fffffd806bae0060,1b70000,0,3) at uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 pmap_get_ptp(fffffd806bae0010,6dc36246000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1209 pmap_enter(fffffd806bae0010,6dc36246000,65de8000,1,20) at pmap_enter+0x2be sys/arch/amd64/amd64/pmap.c:2716 uvm_fault_upper_lookup(ffff8000246df740,ffff8000246df778,ffff8000246df640,ffff8000246df6c0) at uvm_fault_upper_lookup+0x2c0 sys/uvm/uvm_fault.c:895 uvm_fault(fffffd806bc0c3b8,6dc36247000,0,1) at uvm_fault+0x129 sys/uvm/uvm_fault.c:605 upageflttrap(ffff8000246df8c0,6dc362479e4) at upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000246df8c0) at usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x79ac49d8b5b0, count: -14 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(ffff8000ffff8978,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff8978,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff8968) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002120c2c0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002120c2c0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002120c2c0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002120c2c0,6,ffff8000246e5d48) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002120c2c0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff8000246e5e80) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff8000246e5e80) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6c7f01a8f10, count: -9