panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 953 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333eb70) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8337b089,ffffffff833dc7dd,3b9,ffffffff833b6687) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037d3f620,ffffffff833359ab) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:954 pppx_if_destroy(205b9a,ffff800037d3f618) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c9e0a90) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002f52f8e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064bd58a8,2,fffffd8007bfb750,ffff80003c9e0a90) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806c035358,ffff80003c9e0a90) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c035358,ffff80003c9e0a90) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c9e0a90) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003c9e0a90,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c9e0a90,ffff80002f52fc40,ffff80002f52fb90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002f52fc30, count: 0 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 953 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333eb70) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8337b089,ffffffff833dc7dd,3b9,ffffffff833b6687) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037d3f620,ffffffff833359ab) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:954 pppx_if_destroy(205b9a,ffff800037d3f618) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c9e0a90) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002f52f8e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064bd58a8,2,fffffd8007bfb750,ffff80003c9e0a90) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806c035358,ffff80003c9e0a90) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c035358,ffff80003c9e0a90) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c9e0a90) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003c9e0a90,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c9e0a90,ffff80002f52fc40,ffff80002f52fb90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f52fc40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f52fc40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739379438a30, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002f52f6c0 rbx 0 rdx 0 rcx 0 rax 0xffff80003c9e0a90 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc5e0f61c4699bebd r11 0xe8d5eb3545093575 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff83223325 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f52f6b0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=4341 pid=32482 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c9e0a90 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c9e0030,0xffff80003c9e0808 process=0xffff80003c976d28 user=0xffff80002f52a000, vmspace=0xfffffd8064bb6188 estcpu=33, cpticks=4, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 91521 144216 77910 0 2 0 syz-executor 24556 413391 89658 0 2 0 syz-executor 24556 489197 89658 0 3 0x4000080 fsleep syz-executor 7806 349084 18615 0 2 0 syz-executor 7806 259013 18615 0 3 0x4000080 kqpoll syz-executor 7806 66685 18615 0 3 0x4000080 fsleep syz-executor 48718 155832 26963 0 3 0x80 nanoslp syz-executor 48718 40019 26963 0 3 0x4000000 smrbar syz-executor 48718 244854 26963 0 3 0x4000080 fsleep syz-executor 67657 67399 14616 60928 2 0x10 syz-executor 67657 16286 14616 60928 3 0x4000090 fsleep syz-executor 27274 480127 0 0 3 0x14200 acct acct 42237 254232 0 0 3 0x14200 bored sosplice 64681 147292 0 0 3 0x14280 nfsidl nfsio 27572 445319 0 0 3 0x14280 nfsidl nfsio 69873 373399 0 0 3 0x14280 nfsidl nfsio 70829 147247 0 0 3 0x14280 nfsidl nfsio 41480 262436 0 0 3 0x14280 nfsidl nfsio 40471 160701 0 0 3 0x14280 nfsidl nfsio 73278 180213 0 0 3 0x14280 nfsidl nfsio 37220 59681 0 0 3 0x14280 nfsidl nfsio 49544 292409 0 0 3 0x14280 nfsidl nfsio 21615 191035 0 0 3 0x14280 nfsidl nfsio 24920 117043 0 0 3 0x14280 nfsidl nfsio 91652 498098 0 0 3 0x14280 nfsidl nfsio 65690 344170 0 0 3 0x14280 nfsidl nfsio 26299 78780 0 0 3 0x14280 nfsidl nfsio 69946 8487 0 0 3 0x14280 nfsidl nfsio 10269 223138 0 0 3 0x14280 nfsidl nfsio 17636 309652 0 0 3 0x14280 nfsidl nfsio 87485 205424 0 0 3 0x14280 nfsidl nfsio 22525 45745 0 0 3 0x14280 nfsidl nfsio 59197 321627 0 0 3 0x14280 nfsidl nfsio 17168 425923 32037 0 3 0x82 nanoslp syz-executor 77910 151919 32037 0 2 0xc82 syz-executor 89658 498411 32037 0 3 0x82 nanoslp syz-executor 26963 277355 32037 0 3 0x82 nanoslp syz-executor 18615 519608 32037 0 3 0x82 nanoslp syz-executor 14616 197862 32037 0 3 0x82 nanoslp syz-executor 32037 311369 84816 0 3 0x82 wait syz-executor 84816 269597 75929 0 3 0x10008a sigsusp ksh 75929 349357 12236 0 3 0x98 kqread sshd-session 12236 34615 49810 0 3 0x92 kqread sshd-session 30562 245208 1 0 3 0x100083 ttyopn getty 49810 190427 1 0 3 0x88 kqread sshd 49963 195261 56360 73 3 0x1100010 ffs_fsync syslogd 56360 141226 1 0 3 0x100082 sbwait syslogd 68456 178226 1 0 3 0x100080 kqread resolvd 14747 6406 45884 77 3 0x100092 kqread dhcpleased 20776 366576 45884 77 3 0x100092 kqread dhcpleased 45884 111204 1 0 3 0x80 kqread dhcpleased 89215 171252 0 0 3 0x14200 bored smr 612 275219 0 0 2 0x14200 zerothread 67116 36521 0 0 3 0x14200 aiodoned aiodoned 66125 239294 0 0 3 0x14200 syncer update 76300 136801 0 0 3 0x14200 cleaner cleaner 69239 357119 0 0 3 0x14200 reaper reaper 87297 19601 0 0 3 0x14200 pgdaemon pagedaemon 98308 468768 0 0 3 0x14200 bored viomb 47908 403184 0 0 3 0x40014200 acpi0 acpi0 7401 207336 0 0 3 0x14200 bored softnet7 23242 454779 0 0 3 0x14200 bored softnet6 17623 508563 0 0 3 0x14200 bored softnet5 87811 183513 0 0 3 0x14200 bored softnet4 34143 40361 0 0 3 0x14200 bored softnet3 18 340702 0 0 3 0x14200 bored softnet2 9906 257725 0 0 3 0x14200 bored softnet1 68000 485084 0 0 3 0x14200 bored softnet0 19076 339955 0 0 3 0x14200 smrbar systqmp 66324 434114 0 0 3 0x14200 bored systq 379 100634 0 0 2 0x40014200 softclock 24693 190026 0 0 3 0x40014200 idle0 1 329090 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10234 11197K 11353K 166960K 12203 0 pcb 19 15K 17K 166960K 312 0 rtable 168 8K 9K 166960K 387 0 pf 37 14K 14K 166960K 101 0 ifaddr 38 6K 7K 166960K 88 0 ifgroup 63 2K 2K 166960K 161 0 sysctl 4 1K 9K 166960K 10 0 counters 37 18K 18K 166960K 75 0 ioctlops 0 0K 4K 166960K 318 0 iov 0 0K 28K 166960K 40 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1436 90K 91K 166960K 2224 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 101 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 236K 166960K 940 0 sigio 0 0K 0K 166960K 16 0 proc 60 59K 124K 166960K 720 0 subproc 72 4K 4K 166960K 173 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 134 0 in_multi 67 5K 7K 166960K 125 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 568 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 222 160K 168K 166960K 9259 0 UVM aobj 30 3K 3K 166960K 32 0 pinsyscall 37 74K 96K 166960K 2052 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 39 0 NDP 14 0K 2K 166960K 60 0 temp 64 8641K 8711K 166960K 46891 0 kqueue 14 22K 30K 166960K 183 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 79 0 76 1 0 1 1 0 8 0 rtentry 136 126 0 61 4 0 4 4 0 8 0 unpcb 144 459 0 443 2 0 2 2 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 229 0 222 4 3 1 4 0 8 0 arp 88 15 0 4 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 7 0 2 1 0 1 1 0 8 0 inpcb 328 828 0 814 9 7 2 8 0 8 0 ip6q 72 6 0 2 1 0 1 1 0 8 0 ip6af 40 10 0 5 1 0 1 1 0 8 0 nd6 104 25 0 14 1 0 1 1 0 8 0 pkpcb 40 3 0 2 2 1 1 1 0 8 0 kcovpl 48 19 0 11 1 0 1 1 0 8 0 ppxss 1072 24 0 22 1 0 1 1 0 8 0 pppxif 1384 4 0 2 2 1 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 600 0 294 30 3 27 30 0 8 3 art_table 40 603 0 294 5 0 5 5 0 8 0 art_node 32 126 0 69 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 11 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 98 0 88 1 0 1 1 0 8 0 shmpl 112 29 0 2 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 3061 0 1554 95 0 95 95 0 8 0 ffsino 256 3061 0 1554 95 0 95 95 0 8 0 nchpl 144 4295 0 2600 63 0 63 63 0 8 0 rtmask 32 4 0 4 1 1 0 1 0 8 0 uvmvnodes 80 3643 0 0 75 0 75 75 0 8 0 vnodes 216 3643 0 0 203 0 203 203 0 8 0 namei 1024 16231 0 16231 3 2 1 2 0 8 1 kstatmem 264 86 0 58 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 19276 0 19275 15 7 8 8 1 8 7 plimitpl 152 415 0 399 1 0 1 1 0 8 0 sigapl 424 1214 0 1144 9 0 9 9 0 8 0 knotepl 120 310716 0 310666 37 26 11 16 0 8 8 kqueuepl 184 322 0 309 4 3 1 4 0 8 0 pipepl 304 196 0 169 3 0 3 3 0 8 0 fdescpl 448 1170 0 1142 5 1 4 5 0 8 0 filepl 120 7842 0 7624 14 5 9 14 0 8 2 lockfpl 104 503 0 500 2 1 1 2 0 8 0 lockfspl 48 167 0 164 1 0 1 1 0 8 0 sessionpl 144 33 0 25 1 0 1 1 0 8 0 pgrppl 48 63 0 47 1 0 1 1 0 8 0 ucredpl 104 1361 0 1348 1 0 1 1 0 8 0 zombiepl 144 1147 0 1144 1 0 1 1 0 8 0 processpl 1152 1214 0 1144 6 0 6 6 0 8 0 procpl 664 2333 0 2257 8 0 8 8 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 552 1517 0 1483 9 5 4 9 0 8 1 mcl64k 65536 48 0 47 1 0 1 1 0 8 0 mcl16k 16384 5 0 5 1 1 0 1 0 8 0 mcl9k 9216 4 0 4 2 1 1 1 0 8 1 mcl8k 8192 12 0 12 2 1 1 1 0 8 1 mcl4k 4096 3443 0 3393 14 6 8 13 0 8 0 mcl2k 2048 1283 0 1273 2 0 2 2 0 8 0 mtagpl 96 11 0 8 1 0 1 1 0 8 0 mbufpl 256 11701 0 11544 18 5 13 18 0 8 0 bufpl 280 7739 0 1511 446 0 446 446 0 8 0 anonpl 24 194507 0 186383 94 18 76 76 0 187 0 amapchunkpl 152 30536 0 30013 46 18 28 38 0 158 7 amappl16 200 4087 0 3830 43 16 27 27 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 108 0 98 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1833 0 1806 3 1 2 3 0 8 0 amappl11 160 58 0 48 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 37 0 35 1 0 1 1 0 8 0 amappl7 128 104 0 93 1 0 1 1 0 8 0 amappl6 120 234 0 230 1 0 1 1 0 8 0 amappl5 112 132 0 125 1 0 1 1 0 8 0 amappl4 104 288 0 271 1 0 1 1 0 8 0 amappl3 96 6087 0 5989 4 0 4 4 0 8 1 amappl2 88 678 0 622 2 0 2 2 0 8 0 amappl1 80 11454 0 10902 14 1 13 14 0 8 0 amappl 88 8422 0 8265 5 0 5 5 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 7 0 7 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 31 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1170 0 1142 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1170 0 1142 1 0 1 1 0 8 0 vmmpekpl 168 10199 0 10157 2 0 2 2 0 8 0 vmmpepl 168 81575 0 79539 115 10 105 105 0 357 1 vmsppl 368 1169 0 1142 4 1 3 4 0 8 0 rwobjpl 40 25802 0 21052 51 0 51 51 0 8 0 pdppl 4096 2346 0 2284 134 64 70 82 0 8 8 pvpl 32 517356 0 504297 204 48 156 156 0 265 8 pmappl 216 1169 0 1142 3 0 3 3 0 8 1 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 418 0 90 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333eb70) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8337b089,ffffffff833dc7dd,3b9,ffffffff833b6687) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037d3f620,ffffffff833359ab) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:954 pppx_if_destroy(205b9a,ffff800037d3f618) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c9e0a90) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002f52f8e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064bd58a8,2,fffffd8007bfb750,ffff80003c9e0a90) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806c035358,ffff80003c9e0a90) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c035358,ffff80003c9e0a90) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c9e0a90) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003c9e0a90,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c9e0a90,ffff80002f52fc40,ffff80002f52fb90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f52fc40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f52fc40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739379438a30, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333eb70) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8337b089,ffffffff833dc7dd,3b9,ffffffff833b6687) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037d3f620,ffffffff833359ab) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:954 pppx_if_destroy(205b9a,ffff800037d3f618) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c9e0a90) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002f52f8e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064bd58a8,2,fffffd8007bfb750,ffff80003c9e0a90) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c035358,ffff80003c9e0a90) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806c035358,ffff80003c9e0a90) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c035358,ffff80003c9e0a90) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c9e0a90) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003c9e0a90,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c9e0a90,ffff80002f52fc40,ffff80002f52fb90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f52fc40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f52fc40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739379438a30, count: -16