witness: lock order reversal: 1st 0xffffffff82c65f30 &sched_lock (&sched_lock) 2nd 0xffff800029575a48 &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(ffff800029575a48,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800029575a48,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800029575a38) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211efaa0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211efaa0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211efaa0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211efaa0,6,ffff80002e43f4f8) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211efaa0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002e43f630) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e43f630) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1abb3b154d0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff80002e43f200 rbx 0x3 rdx 0xffff800000d0ca40 rcx 0xffff8000211efaa0 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff80002e43f170 r9 0x8080808080808080 r10 0x9a7b9c0a44d5675 r11 0xc1ee576ab9295b78 r12 0xfffffd8003a0d7a0 r13 0 r14 0xfffffd80039fd260 r15 0xfffffd80031cabc0 rip 0xffffffff8165630c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002e43f1f0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.5) pid=332311 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000212d2008,0xffff80002120d018 process=0xffff800029575938 user=0xffff80002e43a000, vmspace=0xfffffd8069b34590 estcpu=1, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7937 10307 65927 32767 2 0x10 syz-executor.6 20775 451545 58060 32767 7 0x10 syz-executor.0 56774 175696 90055 32767 4 0x582010 syz-executor.5 *56774 332311 90055 32767 7 0x4502010 syz-executor.5 58585 126626 40514 32767 2 0x10 syz-executor.2 58585 300673 40514 32767 2 0x4000010 syz-executor.2 88668 129969 47393 32767 2 0x10 syz-executor.1 88668 440074 47393 32767 3 0x4000090 fsleep syz-executor.1 77513 360105 31595 32767 2 0x10 syz-executor.3 77513 18547 31595 32767 3 0x4000090 fsleep syz-executor.3 29535 51303 61222 32767 2 0x10 syz-executor.4 29535 162576 61222 32767 3 0x4000090 pipewr syz-executor.4 47393 116903 51792 32767 3 0x90 nanoslp syz-executor.1 51792 278643 43761 0 3 0x82 wait syz-executor.1 30959 97912 0 0 3 0x14200 bored sosplice 91586 78287 43860 32767 3 0x90 nanoslp syz-executor.7 65927 391265 38731 32767 3 0x90 nanoslp syz-executor.6 43860 369852 43761 0 3 0x82 wait syz-executor.7 38731 219544 43761 0 3 0x82 wait syz-executor.6 61222 97873 59292 32767 3 0x90 nanoslp syz-executor.4 59292 406280 43761 0 3 0x82 wait syz-executor.4 90055 178841 92880 32767 3 0x90 nanoslp syz-executor.5 31595 66998 29313 32767 3 0x90 nanoslp syz-executor.3 40514 232916 17955 32767 3 0x90 nanoslp syz-executor.2 92880 260234 43761 0 3 0x82 wait syz-executor.5 17955 316390 43761 0 3 0x82 wait syz-executor.2 29313 67495 43761 0 3 0x82 wait syz-executor.3 58060 458416 49919 32767 3 0x90 nanoslp syz-executor.0 49919 214138 43761 0 3 0x82 wait syz-executor.0 43761 467859 69632 0 3 0x2000082 thrsleep syz-fuzzer 43761 390056 69632 0 3 0x6000082 thrsleep syz-fuzzer 43761 220166 69632 0 3 0x6000082 wait syz-fuzzer 43761 116808 69632 0 3 0x6000082 wait syz-fuzzer 43761 431921 69632 0 3 0x6000082 wait syz-fuzzer 43761 475282 69632 0 3 0x6000082 wait syz-fuzzer 43761 118526 69632 0 3 0x6000082 wait syz-fuzzer 43761 181284 69632 0 3 0x6000082 wait syz-fuzzer 43761 311196 69632 0 3 0x6000082 thrsleep syz-fuzzer 43761 325489 69632 0 3 0x6000082 wait syz-fuzzer 43761 260365 69632 0 3 0x6000082 thrsleep syz-fuzzer 43761 14574 69632 0 3 0x6000082 thrsleep syz-fuzzer 43761 121765 69632 0 3 0x6000082 wait syz-fuzzer 43761 155427 69632 0 3 0x6000082 thrsleep syz-fuzzer 43761 335537 69632 0 3 0x6000082 kqread syz-fuzzer 43761 194912 69632 0 3 0x6000082 thrsleep syz-fuzzer 69632 179533 20600 0 3 0x10008a sigsusp ksh 20600 350301 56880 0 3 0x9a kqread sshd 37101 317829 1 0 3 0x100083 ttyin getty 56880 382671 1 0 3 0x88 kqread sshd 59283 272665 16753 73 3 0x1100090 kqread syslogd 16753 439569 1 0 3 0x100082 netio syslogd 50791 10157 1 0 3 0x100080 kqread resolvd 79425 172582 47267 77 3 0x100092 kqread dhcpleased 78711 342554 47267 77 3 0x100092 kqread dhcpleased 47267 458824 1 0 3 0x80 kqread dhcpleased 50192 428867 0 0 3 0x14200 bored smr 54321 347063 0 0 2 0x14200 zerothread 18711 126878 0 0 3 0x14200 aiodoned aiodoned 81519 210636 0 0 3 0x14200 syncer update 45101 462948 0 0 3 0x14200 cleaner cleaner 35848 295966 0 0 3 0x14200 reaper reaper 80376 107264 0 0 3 0x14200 pgdaemon pagedaemon 61227 79414 0 0 3 0x14200 bored viomb 11492 242728 0 0 3 0x40014200 acpi0 acpi0 391 521377 0 0 3 0x40014200 idle1 19960 84068 0 0 3 0x14200 bored softnet3 84828 379062 0 0 3 0x14200 bored softnet2 15840 404078 0 0 3 0x14200 bored softnet1 61799 412400 0 0 3 0x14200 bored softnet0 65200 409983 0 0 3 0x14200 bored systqmp 30024 259811 0 0 3 0x14200 bored systq 19063 281166 0 0 3 0x40014200 bored softclock 58254 213040 0 0 3 0x40014200 idle0 1 234500 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 (0xffffffff82d03148) #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_lower_lookup+0x2a4 sys/uvm/uvm_fault.c:1192 #8 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #9 uvm_fault+0x238 #10 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #11 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #12 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8066dfd6d8) #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_lower_lookup+0x2a4 sys/uvm/uvm_fault.c:1192 #5 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #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 (0xffffffff82c65f30) #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 20775 (syz-executor.0) thread 0xffff80002120d008 (451545) exclusive rwlock uobjlk r = 0 (0xfffffd806ef23860) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 uvm_fault_lower_lookup+0x4a sys/uvm/uvm_fault.c:1126 #3 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #4 uvm_fault+0x238 #5 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd8069b342e8) #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 56774 (syz-executor.5) thread 0xffff8000211efaa0 (332311) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82d03430) #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 (0xffffffff82c65f30) #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 10211 6411K 6420K 78643K 11293 0 pcb 13 12K 14K 78643K 17 0 rtable 240 6K 7K 78643K 442 0 pf 29 8K 8K 78643K 31 0 ifaddr 44 15K 15K 78643K 50 0 ifgroup 50 2K 2K 78643K 54 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 62 0 ioctlops 0 0K 2K 78643K 41 0 iov 0 0K 16K 78643K 359 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 3078 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 33 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 331 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 117K 78643K 2733 0 sigio 0 0K 0K 78643K 122 0 proc 56 78K 103K 78643K 647 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 79 0 in_multi 99 7K 7K 78643K 137 0 ether_multi 1 0K 0K 78643K 1 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 205 917K 917K 78643K 205 0 exec 0 0K 1K 78643K 697 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 378 89K 103K 78643K 29488 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 119 0 NDP 11 0K 2K 78643K 30 0 temp 74 5920K 5986K 78643K 10109 0 kqueue 12 18K 34K 78643K 328 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 120 161 0 158 3 2 1 3 0 8 0 rtentry 112 136 0 23 4 0 4 4 0 8 0 unpcb 144 2946 0 2933 52 51 1 6 0 8 0 syncache 304 36 0 36 8 8 0 1 0 8 0 tcpqe 32 497 0 497 9 9 0 1 0 8 0 tcpcb 808 1483 0 1473 63 55 8 14 0 8 6 arp 120 20 0 2 1 0 1 1 0 8 0 ipq 40 9 0 9 4 4 0 1 0 8 0 ipqe 40 35 0 35 4 4 0 1 0 8 0 inpcb 368 2394 0 2380 83 74 9 14 0 8 6 nd6 136 41 0 14 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 556 0 97 34 5 29 30 0 8 0 art_table 32 557 0 97 4 0 4 4 0 8 0 art_node 16 135 0 32 1 0 1 1 0 8 0 semapl 112 327 0 317 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6261 0 4821 91 0 91 91 0 8 0 ffsino 272 6261 0 4821 97 0 97 97 0 8 0 nchpl 144 9945 0 8301 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 35363 0 35363 5 4 1 2 0 8 1 percpumem 16 44 0 1 1 0 1 1 0 8 0 kstatmem 264 24 0 2 2 0 2 2 0 8 0 scxspl 216 24471 0 24471 14 13 1 8 1 8 1 plimitpl 152 254 0 231 6 5 1 2 0 8 0 sigapl 424 3027 0 2972 7 0 7 7 0 8 0 futexpl 64 22690 0 22688 8 7 1 1 0 8 0 knotepl 120 490 0 0 11 3 8 11 0 8 0 kqueuepl 216 516 0 508 9 8 1 3 0 8 0 pipepl 320 749 0 720 26 23 3 8 0 8 0 fdescpl 496 3009 0 2973 7 1 6 6 0 8 0 filepl 152 23401 0 23164 100 85 15 17 0 8 5 lockfpl 104 287 0 285 1 0 1 1 0 8 0 lockfspl 48 100 0 98 1 0 1 1 0 8 0 sessionpl 144 24 0 8 1 0 1 1 0 8 0 pgrppl 48 217 0 201 1 0 1 1 0 8 0 ucredpl 104 8484 0 8466 1 0 1 1 0 8 0 zombiepl 144 2973 0 2972 1 0 1 1 0 8 0 processpl 1072 3027 0 2972 4 0 4 4 0 8 0 procpl 680 8009 0 7934 26 19 7 8 0 8 0 sosppl 168 50 0 50 9 9 0 1 0 8 0 sockpl 488 5561 0 5531 245 234 11 22 0 8 6 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 24 0 0 3 0 3 3 0 8 0 mcl4k 4096 29 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 322 0 0 32 7 25 32 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 590 0 0 22 1 21 22 0 8 0 bufpl 288 7106 0 778 453 0 453 453 0 8 0 anonpl 24 468842 0 457498 146 68 78 97 0 186 0 amapchunkpl 152 100599 0 99705 103 63 40 51 0 158 3 amappl16 200 12601 0 12308 74 58 16 30 0 8 0 amappl15 192 19 0 18 1 0 1 1 0 8 0 amappl14 184 157 0 144 2 1 1 2 0 8 0 amappl13 176 15 0 15 2 2 0 1 0 8 0 amappl12 168 3653 0 3619 2 0 2 2 0 8 0 amappl11 160 52 0 41 1 0 1 1 0 8 0 amappl10 152 43 0 33 1 0 1 1 0 8 0 amappl9 144 239 0 238 1 0 1 1 0 8 0 amappl8 136 351 0 255 4 0 4 4 0 8 0 amappl7 128 98 0 82 2 1 1 2 0 8 0 amappl6 120 278 0 258 2 1 1 2 0 8 0 amappl5 112 245 0 234 1 0 1 1 0 8 0 amappl4 104 632 0 595 3 0 3 3 0 8 0 amappl3 96 18610 0 18515 4 1 3 4 0 8 0 amappl2 88 3398 0 3327 3 1 2 3 0 8 0 amappl1 80 18771 0 18238 22 9 13 22 0 8 0 amappl 88 28857 0 28610 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 3009 0 2973 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3009 0 2973 1 0 1 1 0 8 0 vmmpekpl 168 28161 0 28103 3 0 3 3 0 8 0 vmmpepl 168 196204 0 193786 178 67 111 120 0 357 2 vmsppl 464 3008 0 2973 7 2 5 6 0 8 0 rwobjpl 56 63242 0 55847 110 4 106 106 0 8 0 pdppl 4096 6026 0 5946 418 336 82 92 0 8 2 pvpl 32 1097702 0 1080180 432 276 156 355 0 265 0 pmappl 248 3008 0 2973 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1343 0 503 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82bc3ff0) 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(ffffffff82c65d28) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c65d28) at __mp_lock+0x122 sys/kern/kern_lock.c:147 wakeup_n(ffffffff82d02fb4,ffffffff) at wakeup_n+0x37 sys/kern/kern_synch.c:541 uvm_pmr_getpages(1,0,0,1,0,1,638d0e5e7df094ab,0) at uvm_pmr_getpages+0xeef sys/uvm/uvm_pmemrange.c:1207 uvm_pagealloc(fffffd8066dfd738,1c000,0,3) at uvm_pagealloc+0x1a8 sys/uvm/uvm_page.c:910 pmap_get_ptp(fffffd8066dfd6c8,e62f094f000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1209 pmap_enter(fffffd8066dfd6c8,e62f094f000,64c69000,4,20) at pmap_enter+0x2be sys/arch/amd64/amd64/pmap.c:2716 uvm_fault_lower_lookup(ffff80002e4455b0,ffff80002e4455e8,ffff80002e445530) at uvm_fault_lower_lookup+0x2a4 sys/uvm/uvm_fault.c:1192 uvm_fault_lower(ffff80002e4455b0,ffff80002e4455e8,ffff80002e445530,0) at uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 uvm_fault(fffffd8069b341f0,e62f094e000,0,4) at uvm_fault+0x238 upageflttrap(ffff80002e445730,e62f094ec9b) at upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002e445730) at usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e9592b39240, count: -15 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(ffff800029575a48,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800029575a48,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff800029575a38) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff8000211efaa0,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff8000211efaa0,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff8000211efaa0,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff8000211efaa0,6,ffff80002e43f4f8) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff8000211efaa0) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff80002e43f630) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e43f630) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1abb3b154d0, count: -9