panic: amap_pp_adjref: negative reference count Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *507183 77031 0 0x2 0 1K sshd-session 174025 3992 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8351cfba) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff3806e72be78,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:881 amap_adjref_anons(fffff3806e72be78,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1299 uvm_mapent_clone(fffff3806d19e3f0,d2492a56000,1000,0,1,7,cb635988ea0b346d,fffff3806d3754c0,ffff80002a2da298,fffff3806d19e3f0) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff3806d19e3f0,fffff3806d19eb90,fffff3806d3754c0,ffff80002a2da298) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045fe1d00) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe4a88,ffff800045fe1d00,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff800045fe5780,1,ffffffff82f4d7b0,0,ffff80002a2da470,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2da520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2da520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72d06621e980, count: 4 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: amap_pp_adjref: negative reference count ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8351cfba) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff3806e72be78,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:881 amap_adjref_anons(fffff3806e72be78,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1299 uvm_mapent_clone(fffff3806d19e3f0,d2492a56000,1000,0,1,7,cb635988ea0b346d,fffff3806d3754c0,ffff80002a2da298,fffff3806d19e3f0) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff3806d19e3f0,fffff3806d19eb90,fffff3806d3754c0,ffff80002a2da298) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045fe1d00) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe4a88,ffff800045fe1d00,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff800045fe5780,1,ffffffff82f4d7b0,0,ffff80002a2da470,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2da520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2da520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72d06621e980, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2d9f60 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff800045fe5780 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x14f8e5cc5160b4ab r11 0x44f08dec3a61ffaa r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff8240c965 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a2d9f50 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (sshd-session) tid=507183 pid=77031 tcnt=1 stat=onproc flags process=2 proc=0 runpri=51, usrpri=86, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fe74e0,0xffffffff83ac5120 process=0xffff800045fe1d00 user=0xffff80002a2d5000, vmspace=0xfffff3806d19eb90 estcpu=36, cpticks=15875, pctcpu=0.0, user=1, sys=15873, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *77031 507183 24012 0 7 0x2 0 sshd-session 3992 174025 16870 32767 7 0x10 0 syz-executor 3992 190049 16870 32767 3 0x10 0x4000080 fsleep syz-executor 12606 208515 22306 32767 2 0x10 0 syz-executor 12606 392050 22306 32767 3 0x10 0x4000080 msgwait syz-executor 12606 216309 22306 32767 3 0x10 0x4000080 fsleep syz-executor 52376 389679 74022 32767 3 0x10 0x80 piperd syz-executor 74022 236492 96755 0 3 0x2 0x80 wait syz-executor 16870 86981 80253 32767 2 0x10 0 syz-executor 80253 110067 96755 0 3 0x2 0x80 wait syz-executor 63679 42237 45085 32767 3 0x10 0x80 piperd syz-executor 22306 119138 37736 32767 3 0x10 0x80 nanoslp syz-executor 11803 166539 63009 32767 3 0x10 0x80 piperd syz-executor 24680 141064 88226 32767 3 0x10 0x80 piperd syz-executor 48670 499272 48045 32767 3 0x10 0x80 piperd syz-executor 63009 417326 96755 0 3 0x2 0x80 wait syz-executor 88226 84068 96755 0 3 0x2 0x80 wait syz-executor 48045 423993 96755 0 3 0x2 0x80 wait syz-executor 45085 137337 96755 0 3 0x2 0x80 wait syz-executor 37736 94681 96755 0 3 0x2 0x80 wait syz-executor 96755 248801 37076 0 3 0x2 0x80 nanoslp syz-executor 37076 310961 39001 0 3 0x100002 0x88 sigsusp ksh 39001 106669 75673 0 3 0x10 0x88 kqread sshd-session 75673 28594 24012 0 3 0x12 0x80 kqread sshd-session 17328 373981 1 0 3 0x100003 0x80 ttyin getty 24012 481361 1 0 3 0 0x88 kqread sshd 6195 396847 93555 73 3 0x1100010 0x80 kqread syslogd 93555 15541 1 0 3 0x100002 0x80 sbwait syslogd 76756 213099 1 0 3 0x100000 0x80 kqread resolvd 76868 411015 28846 77 3 0x100012 0x80 kqread dhcpleased 27191 208253 28846 77 3 0x100012 0x80 kqread dhcpleased 28846 229042 1 0 3 0 0x80 kqread dhcpleased 83587 331261 0 0 3 0x14000 0x200 bored smr 35463 506955 0 0 2 0x14000 0x200 zerothread 49553 82010 0 0 3 0x14000 0x200 aiodoned aiodoned 34776 22086 0 0 3 0x14000 0x200 syncer update 1980 517205 0 0 3 0x14000 0x200 cleaner cleaner 59113 92249 0 0 3 0x14000 0x200 reaper reaper 8816 498484 0 0 3 0x14000 0x200 pgdaemon pagedaemon 70048 270898 0 0 3 0x14000 0x200 bored viomb 89104 126840 0 0 3 0x14000 0x40000200 acpi0 acpi0 82931 296137 0 0 3 0x14000 0x40000200 idle1 15772 456299 0 0 3 0x14000 0x200 bored softnet1 62974 413295 0 0 2 0x14000 0x200 softnet0 4701 328653 0 0 3 0x14000 0x200 bored systqmp 78058 418180 0 0 3 0x14000 0x200 bored systq 54082 203732 0 0 3 0x14000 0x200 tmoslp softclockmp 50970 421188 0 0 3 0x14000 0x40000200 tmoslp softclock 4692 157045 0 0 3 0x14000 0x40000200 idle0 1 283707 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks Process 77031 (sshd-session) thread 0xffff800045fe5780 (507183) exclusive rwlock amaplk r = 0 (0xfffff3806cef92a0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 amap_ref+0x3c sys/uvm/uvm_amap.c:1313 #3 uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 #4 uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 #5 uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 #6 process_new+0x583 sys/kern/kern_fork.c:282 #7 fork1+0x3f6 sys/kern/kern_fork.c:-1 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff3806d19e4f0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3752 #4 process_new+0x583 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff3806d19ec90) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3743 #4 process_new+0x583 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a04b40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 3992 (syz-executor) thread 0xffff800045fe4028 (174025) exclusive rwlock uobjlk r = 0 (0xfffff3806d15f238) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffff3806ce37e88) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11053 12017K 12034K 166960K 12153 0 pcb 17 12K 12K 166960K 17 0 rtable 219 6K 7K 166960K 522 0 pf 29 16K 16K 166960K 35 0 ifaddr 38 6K 7K 166960K 52 0 ifgroup 46 2K 2K 166960K 58 0 sysctl 4 1K 9K 166960K 13 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 59 0 iov 0 0K 16K 166960K 34 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1615 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 50 0 dirhash 12 2K 3K 166960K 27 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 125K 166960K 753 0 sigio 0 0K 0K 166960K 12 0 proc 58 99K 147K 166960K 639 0 subproc 63 3K 4K 166960K 207 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 98 0 in_multi 88 6K 7K 166960K 135 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 474 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 204 151K 186K 166960K 8340 0 UVM aobj 54 4K 4K 166960K 59 0 pinsyscall 43 86K 112K 166960K 2022 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 44 0 NDP 10 0K 2K 166960K 33 0 temp 49 9122K 9186K 166960K 5603 0 kqueue 14 22K 31K 166960K 122 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 92 0 89 1 0 1 1 0 8 0 rtentry 176 140 0 39 6 0 6 6 0 8 0 unpcb 144 419 0 400 4 3 1 4 0 8 0 syncache 336 19 0 19 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 238 0 230 2 0 2 2 0 8 0 arp 136 22 0 6 1 0 1 1 0 8 0 ipq 40 6 0 2 1 0 1 1 0 8 0 ipqe 40 43 0 39 1 0 1 1 0 8 0 inpcb 328 658 0 646 3 1 2 3 0 8 0 ip6q 72 4 0 1 1 0 1 1 0 8 0 ip6af 40 5 0 2 1 0 1 1 0 8 0 nd6 152 37 0 14 2 0 2 2 0 8 0 kcovpl 48 23 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 585 0 168 31 2 29 31 0 8 0 art_table 40 586 0 168 5 0 5 5 0 8 0 art_node 32 140 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 86 0 78 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 47 0 37 1 0 1 1 0 8 0 shmpl 112 56 0 5 2 0 2 2 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2445 0 962 93 0 93 93 0 8 0 ffsino 296 2445 0 962 115 0 115 115 0 8 0 nchpl 144 3408 0 1704 64 0 64 64 0 8 0 vnodes 216 2661 0 0 148 0 148 148 0 8 0 namei 1024 11631 0 11631 2 1 1 2 0 8 1 percpumem 16 53 0 3 1 0 1 1 0 8 0 kstatmem 264 29 0 6 2 0 2 2 0 8 0 scxspl 216 11471 0 11471 10 2 8 8 1 8 8 plimitpl 152 285 0 263 2 0 2 2 0 8 0 sigapl 424 1046 0 998 7 0 7 7 0 8 0 knotepl 120 364 0 0 12 0 12 12 0 8 0 kqueuepl 224 325 0 315 7 2 5 5 0 8 4 pipepl 344 272 0 244 6 3 3 6 0 8 0 fdescpl 528 1030 0 998 4 0 4 4 0 8 0 filepl 160 5607 0 5404 14 2 12 14 0 8 2 lockfpl 104 147 0 145 1 0 1 1 0 8 0 lockfspl 48 59 0 57 1 0 1 1 0 8 0 sessionpl 144 273 0 257 1 0 1 1 0 8 0 pgrppl 48 302 0 279 1 0 1 1 0 8 0 ucredpl 104 1253 0 1235 1 0 1 1 0 8 0 zombiepl 144 998 0 998 1 0 1 1 0 8 1 processpl 1232 1046 0 998 5 0 5 5 0 8 0 procpl 664 1942 0 1891 7 1 6 7 0 8 0 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 752 1176 0 1142 11 6 5 11 0 8 0 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 1 15 16 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1218 0 0 77 0 77 77 0 8 0 bufpl 272 3419 0 102 222 0 222 222 0 8 0 anonpl 32 10195 0 0 83 0 83 83 0 247 0 amapchunkpl 152 25555 0 25032 36 8 28 36 0 158 4 amappl16 200 2343 0 2324 23 17 6 15 0 8 3 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 437 0 436 1 0 1 1 0 8 0 amappl13 176 152 0 141 1 0 1 1 0 8 0 amappl12 168 1284 0 1253 2 0 2 2 0 8 0 amappl11 160 1 0 1 1 1 0 1 0 8 0 amappl10 152 149 0 139 1 0 1 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 139 0 138 1 0 1 1 0 8 0 amappl7 128 166 0 154 1 0 1 1 0 8 0 amappl6 120 186 0 183 1 0 1 1 0 8 0 amappl5 112 122 0 113 1 0 1 1 0 8 0 amappl4 104 323 0 306 1 0 1 1 0 8 0 amappl3 96 5174 0 5079 5 1 4 4 0 8 0 amappl2 88 713 0 651 2 0 2 2 0 8 0 amappl1 80 18146 0 17505 20 4 16 19 0 8 1 amappl 88 7376 0 7238 5 0 5 5 0 92 0 uvmvnodes 80 123 0 0 3 0 3 3 0 8 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 58 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1030 0 998 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1030 0 998 1 0 1 1 0 8 0 vmmpekpl 168 12218 0 12178 3 0 3 3 0 8 0 vmmpepl 168 80106 0 78194 119 7 112 119 0 357 19 vmsppl 488 1029 0 998 7 1 6 6 0 8 0 rwobjpl 80 25846 0 24782 30 5 25 30 0 8 0 pdppl 4096 2067 0 1996 123 42 81 97 0 8 10 pvpl 32 18097 0 0 146 0 146 146 0 265 0 pmappl 256 1029 0 998 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 585 0 49 16 0 16 16 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83924ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83a04340) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a04340) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83a04340) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a04340) at __mp_lock+0x199 sys/kern/kern_lock.c:173 uvm_fault(fffff3806ce37d88,678c6791000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a2d4c30,678c6791000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a2d4c30) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f156443be00, count: 3 ddb{0}> trace x86_ipi_db(ffffffff83924ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83a04340) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a04340) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83a04340) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a04340) at __mp_lock+0x199 sys/kern/kern_lock.c:173 uvm_fault(fffff3806ce37d88,678c6791000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a2d4c30,678c6791000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a2d4c30) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f156443be00, count: -12 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8351cfba) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff3806e72be78,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:881 amap_adjref_anons(fffff3806e72be78,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1299 uvm_mapent_clone(fffff3806d19e3f0,d2492a56000,1000,0,1,7,cb635988ea0b346d,fffff3806d3754c0,ffff80002a2da298,fffff3806d19e3f0) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff3806d19e3f0,fffff3806d19eb90,fffff3806d3754c0,ffff80002a2da298) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045fe1d00) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe4a88,ffff800045fe1d00,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff800045fe5780,1,ffffffff82f4d7b0,0,ffff80002a2da470,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2da520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2da520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72d06621e980, count: 4 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8351cfba) at panic+0x1e5 sys/kern/subr_prf.c:198 amap_pp_adjref(fffff3806e72be78,0,1,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:881 amap_adjref_anons(fffff3806e72be78,0,1,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1299 uvm_mapent_clone(fffff3806d19e3f0,d2492a56000,1000,0,1,7,cb635988ea0b346d,fffff3806d3754c0,ffff80002a2da298,fffff3806d19e3f0) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503 uvm_mapent_forkcopy(1,fffff3806d19e3f0,fffff3806d19eb90,fffff3806d3754c0,ffff80002a2da298) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573 uvmspace_fork(ffff800045fe1d00) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776 process_new(ffff800045fe4a88,ffff800045fe1d00,1) at process_new+0x583 sys/kern/kern_fork.c:282 fork1(ffff800045fe5780,1,ffffffff82f4d7b0,0,ffff80002a2da470,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1 syscall(ffff80002a2da520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2da520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72d06621e980, count: -11