panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *465902 56349 -1 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b3c52) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f52fb,ffffffff83502b40,3bb,ffffffff8352bbd5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3e64f8,ffffffff834b0654) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff80002a380000,ffff80003c3e64f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c3b82b8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3e16e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800f8f3e60,41,fffffd80097fd5b0,ffff80003c3b82b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffd8062b5f5e8,ffff80003c3b82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd8062b5f5e8,ffff80003c3b82b8) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003c3b82b8,ffff80003c3e19b0,ffff80003c3e1900) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c3e19b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e19b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x38edf598c70, count: 1 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b3c52) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f52fb,ffffffff83502b40,3bb,ffffffff8352bbd5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3e64f8,ffffffff834b0654) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff80002a380000,ffff80003c3e64f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c3b82b8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3e16e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800f8f3e60,41,fffffd80097fd5b0,ffff80003c3b82b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffd8062b5f5e8,ffff80003c3b82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd8062b5f5e8,ffff80003c3b82b8) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003c3b82b8,ffff80003c3e19b0,ffff80003c3e1900) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c3e19b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e19b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x38edf598c70, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3e14b0 rbx 0xffffffff83992e07 cpu_info_full_primary+0x2e07 rdx 0xffff8000015d2540 rcx 0xffff80003c3b82b8 rax 0xffffffff83991ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x27b6c73c189a8f16 r11 0x4f79aa398caae570 r12 0xffffffff83992c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82e5bf15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3e14a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=465902 pid=56349 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3b94e0,0xffff80003c3b8fc0 process=0xffff80002a37dcf8 user=0xffff80003c3dc000, vmspace=0xfffffd806c67eb88 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 23875 169477 62879 0 2 0 syz-executor 23875 266397 62879 0 3 0x4000080 fsleep syz-executor 85634 145382 87240 0 3 0x80 nanoslp syz-executor 85634 165779 87240 0 3 0x4000080 kqsel syz-executor 85634 72630 87240 0 3 0x4000000 smrbar syz-executor 85634 519923 87240 0 3 0x4000080 fsleep syz-executor 56349 464781 83931 -1 2 0x10 syz-executor *56349 465902 83931 -1 7 0x4000010 syz-executor 75031 355146 24499 0 3 0x82 piperd syz-executor 87240 421042 24499 0 2 0xc82 syz-executor 70525 410802 24499 0 3 0x82 piperd syz-executor 62879 361548 24499 0 2 0xc82 syz-executor 64177 211546 24499 0 2 0xc82 syz-executor 61807 5034 24499 0 3 0x82 piperd syz-executor 69439 79457 24499 0 3 0x82 piperd syz-executor 83931 206529 24499 0 3 0x82 nanoslp syz-executor 24499 509562 94905 0 2 0xc82 syz-executor 94905 424275 32372 0 3 0x10008a sigsusp ksh 32372 19416 49158 0 3 0x98 kqread sshd-session 49158 363810 42093 0 3 0x92 kqread sshd-session 3852 514130 1 0 3 0x100083 ttyin getty 42093 115100 1 0 3 0x88 kqread sshd 18647 388513 68173 74 3 0x1100092 bpf pflogd 68173 195181 1 0 3 0x80 sbwait pflogd 22345 99429 64606 73 3 0x1100090 kqread syslogd 64606 165996 1 0 3 0x100082 sbwait syslogd 8780 106557 1 0 3 0x100080 kqread resolvd 92915 392027 77055 77 3 0x100092 kqread dhcpleased 34596 111878 77055 77 3 0x100092 kqread dhcpleased 77055 429973 1 0 3 0x80 kqread dhcpleased 35318 295880 0 0 3 0x14200 bored smr 47761 85933 0 0 2 0x14200 zerothread 76256 196733 0 0 3 0x14200 aiodoned aiodoned 88042 269058 0 0 3 0x14200 syncer update 24242 295202 0 0 3 0x14200 cleaner cleaner 89915 322555 0 0 3 0x14200 reaper reaper 89706 201258 0 0 3 0x14200 pgdaemon pagedaemon 2853 484467 0 0 3 0x14200 bored viomb 12112 520002 0 0 3 0x40014200 acpi0 acpi0 14443 360588 0 0 3 0x40014200 idle1 61129 479197 0 0 3 0x14200 bored softnet1 16901 76146 0 0 3 0x14200 bored softnet0 8167 166379 0 0 3 0x14200 smrbar systqmp 67999 61330 0 0 3 0x14200 bored systq 72413 311916 0 0 3 0x14200 tmoslp softclockmp 66854 62332 0 0 3 0x40014200 tmoslp softclock 67479 491361 0 0 3 0x40014200 idle0 1 516759 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff83a9e7c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #3 pmap_do_remove+0x8af sys/arch/amd64/amd64/pmap.c:1942 #4 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869 #5 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #5 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 #6 exit1+0x6fc sys/kern/kern_exit.c:260 #7 sys_exit+0x1a sys/kern/kern_exit.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 Process 56349 (syz-executor) thread 0xffff80003c3b82b8 (465902) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83aaab00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:614 #2 fdrop+0x121 sys/kern/kern_descrip.c:1281 #3 closef+0x192 sys/kern/kern_descrip.c:1265 #4 sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 8167 (systqmp) thread 0xffff8000ffffe298 (166379) shared rwlock systqmp r = 0 (0xffffffff839414b8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11067 12215K 12215K 166960K 12202 0 pcb 17 12K 12K 166960K 20 0 rtable 241 7K 7K 166960K 357 0 pf 38 18K 18K 166960K 49 0 ifaddr 45 7K 7K 166960K 47 0 ifgroup 60 2K 2K 166960K 60 0 sysctl 3 1K 9K 166960K 7 0 counters 74 37K 37K 166960K 76 0 ioctlops 0 0K 4K 166960K 1488 0 iov 0 0K 12K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 81K 81K 166960K 1371 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 45K 85K 166960K 151 0 sigio 0 0K 0K 166960K 2 0 proc 71 115K 164K 166960K 559 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 100 7K 7K 166960K 100 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 31 148K 148K 166960K 31 0 exec 0 0K 1K 166960K 383 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 199 166K 175K 166960K 3214 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 38 76K 100K 166960K 1307 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 29 2K 2K 166960K 29 0 temp 34 9110K 9175K 166960K 4182 0 kqueue 14 22K 28K 166960K 32 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 34 0 31 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 51 0 34 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 13 0 9 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 82 0 72 2 0 2 2 0 8 1 nd6 152 24 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 1 1 0 1 1 0 8 0 pppxif 1576 2 0 1 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 19 0 0 3 0 3 3 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 256 459 0 0 29 0 29 29 0 8 0 art_table 40 460 0 0 5 0 5 5 0 8 0 art_node 32 112 0 10 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1603 0 133 93 0 93 93 0 8 0 ffsino 296 1603 0 133 114 0 114 114 0 8 0 nchpl 144 1821 0 122 64 0 64 64 0 8 0 vnodes 216 1696 0 0 95 0 95 95 0 8 0 namei 1024 5562 0 5562 2 0 2 2 0 8 2 percpumem 16 53 0 1 1 0 1 1 0 8 0 kstatmem 264 29 0 0 2 0 2 2 0 8 0 scxspl 216 6319 0 6319 4 3 1 3 1 8 1 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 468 0 424 6 0 6 6 0 8 0 knotepl 120 534 0 0 17 0 17 17 0 8 0 kqueuepl 224 34 0 21 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 452 0 425 3 0 3 3 0 8 0 filepl 160 1641 0 1425 10 0 10 10 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 92 0 78 1 0 1 1 0 8 0 zombiepl 144 425 0 424 1 0 1 1 0 8 0 processpl 1232 468 0 424 5 0 5 5 0 8 1 procpl 664 503 0 454 5 0 5 5 0 8 0 sockpl 752 172 0 142 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 193 0 0 13 0 13 13 0 8 0 bufpl 280 2320 0 105 159 0 159 159 0 8 0 anonpl 32 3644 0 0 30 0 30 30 0 246 0 amapchunkpl 152 8602 0 8237 19 0 19 19 0 158 1 amappl16 200 1391 0 1371 5 0 5 5 0 8 3 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 459 0 458 1 0 1 1 0 8 0 amappl13 176 240 0 228 1 0 1 1 0 8 0 amappl12 168 698 0 672 2 0 2 2 0 8 0 amappl11 160 7 0 7 2 1 1 1 0 8 1 amappl10 152 70 0 56 1 0 1 1 0 8 0 amappl9 144 279 0 278 1 0 1 1 0 8 0 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 151 0 138 1 0 1 1 0 8 0 amappl6 120 158 0 157 1 0 1 1 0 8 0 amappl5 112 91 0 81 1 0 1 1 0 8 0 amappl4 104 295 0 274 1 0 1 1 0 8 0 amappl3 96 1553 0 1467 3 0 3 3 0 8 0 amappl2 88 533 0 474 2 0 2 2 0 8 0 amappl1 80 10422 0 9830 14 0 14 14 0 8 0 amappl 88 2484 0 2356 4 0 4 4 0 92 0 uvmvnodes 80 101 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 7 0 7 2 1 1 1 0 8 1 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 452 0 425 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 452 0 425 1 0 1 1 0 8 0 vmmpekpl 168 5789 0 5753 2 0 2 2 0 8 0 vmmpepl 168 38120 0 36438 87 0 87 87 0 357 2 vmsppl 488 451 0 424 5 0 5 5 0 8 0 rwobjpl 80 14158 0 13179 23 0 23 23 0 8 0 pdppl 4096 911 0 848 93 12 81 81 0 8 18 pvpl 32 10411 0 0 84 0 84 84 0 265 0 pmappl 256 451 0 424 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 270 0 15 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b3c52) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f52fb,ffffffff83502b40,3bb,ffffffff8352bbd5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3e64f8,ffffffff834b0654) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff80002a380000,ffff80003c3e64f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c3b82b8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3e16e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800f8f3e60,41,fffffd80097fd5b0,ffff80003c3b82b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd8062b5f5e8,ffff80003c3b82b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffd8062b5f5e8,ffff80003c3b82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd8062b5f5e8,ffff80003c3b82b8) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff80003c3b82b8,ffff80003c3e19b0,ffff80003c3e1900) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c3e19b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e19b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x38edf598c70, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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(ffffffff83aaa300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aaa300) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff8000fffee7e0,b,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff8000fffee7e0,ffff80002ff8b000,ffff80002ff8af50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ff8b000) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ff8b000) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7930569272a0, count: 7 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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(ffffffff83aaa300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aaa300) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff8000fffee7e0,b,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff8000fffee7e0,ffff80002ff8b000,ffff80002ff8af50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ff8b000) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ff8b000) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7930569272a0, count: -8