panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 953 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 474952 29998 0 0 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833956d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d22f8,ffffffff833dddd1,3b9,ffffffff83407984) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff8338dd6f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000ffff2018) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003b3f4290) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fa70980,41,fffffd80097fb2d8,ffff8000ffff2018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bbc3c28,ffff8000ffff2018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bbc3c28,ffff8000ffff2018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000ffff2018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000ffff2018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2018,ffff80003b3f4600,ffff80003b3f4550) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003b3f45f0, 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{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 953 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833956d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d22f8,ffffffff833dddd1,3b9,ffffffff83407984) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff8338dd6f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000ffff2018) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003b3f4290) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fa70980,41,fffffd80097fb2d8,ffff8000ffff2018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bbc3c28,ffff8000ffff2018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bbc3c28,ffff8000ffff2018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000ffff2018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000ffff2018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2018,ffff80003b3f4600,ffff80003b3f4550) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003b3f4600) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b3f4600) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7883ad6bdd20, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003b3f4060 rbx 0xffffffff83804ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff8000ffff2018 rax 0xffffffff83803ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x47a02a710667c1a6 r11 0x7ce7193e20b1206b r12 0xffffffff83804be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff82a865d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003b3f4050 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=45047 pid=29870 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000ffff2018 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000ffff34d8,0xffff8000ffff2558 process=0xffff8000fffec9b8 user=0xffff80003b3ef000, vmspace=0xfffffd800ed039a8 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29998 474952 58761 0 7 0 syz-executor 35409 182531 78135 0 2 0 syz-executor 35409 367323 78135 0 3 0x4000000 smrbar syz-executor 520 24776 65642 0 2 0xc80 syz-executor 520 281306 65642 0 3 0x4000080 pipewr syz-executor 520 180104 65642 0 3 0x4000080 pipewr syz-executor 60028 31581 35086 0 2 0x4000c80 syz-executor 60028 402541 35086 0 3 0x4000080 netacc syz-executor 60028 450911 35086 0 3 0x4000080 fsleep syz-executor 58761 482772 69180 0 3 0x82 nanoslp syz-executor 99406 459129 69180 0 3 0x82 wait syz-executor 7205 45004 69180 0 2 0xc82 syz-executor 78135 331522 69180 0 2 0xc82 syz-executor 26878 343285 69180 0 2 0xc82 syz-executor 35086 189767 69180 0 2 0xc82 syz-executor 65642 297584 69180 0 2 0xc82 syz-executor 77506 243292 69180 0 3 0x82 nanoslp syz-executor 69180 327246 25155 0 3 0x82 kqread syz-executor 25155 488645 36675 0 3 0x10008a sigsusp ksh 36675 64124 34513 0 3 0x98 kqread sshd-session 34513 236157 57024 0 3 0x92 kqread sshd-session 1288 227998 1 0 3 0x100083 ttyopn getty 57024 374672 1 0 3 0x88 kqread sshd 19485 211273 42208 74 3 0x1100092 bpf pflogd 42208 400062 1 0 3 0x80 sbwait pflogd 26819 38014 45235 73 3 0x1100090 kqread syslogd 45235 53146 1 0 3 0x100082 sbwait syslogd 17488 152453 1 0 3 0x100080 kqread resolvd 81436 144869 3391 77 3 0x100092 kqread dhcpleased 48978 125409 3391 77 3 0x100092 kqread dhcpleased 3391 479097 1 0 3 0x80 kqread dhcpleased 78950 306505 0 0 3 0x14200 bored smr 56865 284267 0 0 2 0x14200 zerothread 59843 484831 0 0 3 0x14200 aiodoned aiodoned 14644 357955 0 0 3 0x14200 syncer update 96062 377147 0 0 3 0x14200 cleaner cleaner 21862 473594 0 0 3 0x14200 reaper reaper 12951 468617 0 0 3 0x14200 pgdaemon pagedaemon 12820 199453 0 0 3 0x14200 bored viomb 62505 353624 0 0 3 0x40014200 acpi0 acpi0 12879 295680 0 0 3 0x40014200 idle1 61964 442785 0 0 3 0x14200 bored softnet1 71051 301264 0 0 3 0x14200 bored softnet0 81298 298985 0 0 3 0x14200 bored systqmp 11284 283894 0 0 3 0x14200 bored systq 49117 129534 0 0 3 0x14200 tmoslp softclockmp 63537 99968 0 0 3 0x40014200 tmoslp softclock 3042 380926 0 0 3 0x40014200 idle0 1 150629 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 29998 (syz-executor) thread 0xffff80003c430558 (474952) exclusive rwlock amaplk r = 0 (0xfffffd806cf491b8) #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_check+0x8bb sys/uvm/uvm_fault.c:840 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x42f sys/arch/amd64/amd64/trap.c:622 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd800ed03120) #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:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:622 #7 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 11027K 11160K 166960K 11406 0 pcb 17 12K 12K 166960K 70 0 rtable 234 8K 8K 166960K 396 0 pf 41 18K 81K 166960K 62 0 ifaddr 43 7K 7K 166960K 54 0 ifgroup 64 2K 2K 166960K 73 0 sysctl 4 1K 9K 166960K 8 0 counters 74 37K 37K 166960K 214 0 ioctlops 0 0K 4K 166960K 1633 0 iov 0 0K 12K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1340 84K 85K 166960K 1450 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 316 0 sigio 0 0K 0K 166960K 3 0 proc 73 115K 148K 166960K 552 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 38 0 in_multi 89 6K 7K 166960K 105 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 396 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 248 167K 176K 166960K 4610 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 43 86K 104K 166960K 1427 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 14 0K 2K 166960K 33 0 temp 40 8651K 8715K 166960K 9930 0 kqueue 15 24K 26K 166960K 54 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 42 0 39 1 0 1 1 0 8 0 rtentry 176 117 0 16 6 0 6 6 0 8 0 unpcb 144 296 0 275 6 0 6 6 0 8 5 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 77 0 72 4 0 4 4 0 8 3 arp 136 19 0 3 1 0 1 1 0 8 0 inpcb 328 282 0 271 4 0 4 4 0 8 2 nd6 152 25 0 3 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 70 0 69 1 0 1 1 0 8 0 pppxif 1504 3 0 2 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 2 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 33 0 0 1 0 1 1 0 8 0 pfstkey 128 36 0 3 2 0 2 2 0 8 0 pfstate 384 35 0 2 4 0 4 4 0 8 0 pfrule 1344 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 256 469 0 52 29 0 29 29 0 8 1 art_table 40 470 0 52 5 0 5 5 0 8 0 art_node 32 117 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1894 0 381 95 0 95 95 0 8 0 ffsino 296 1894 0 381 117 0 117 117 0 8 0 nchpl 144 2319 0 618 64 0 64 64 0 8 0 vnodes 216 2007 0 0 112 0 112 112 0 8 0 namei 1024 7651 0 7651 1 0 1 1 0 8 1 percpumem 16 122 0 70 1 0 1 1 0 8 0 kstatmem 264 38 0 6 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8014 0 8014 9 1 8 8 1 8 8 plimitpl 152 126 0 108 1 0 1 1 0 8 0 sigapl 424 611 0 563 7 0 7 7 0 8 1 knotepl 120 325 0 0 10 0 10 10 0 8 0 kqueuepl 224 204 0 191 5 0 5 5 0 8 4 pipepl 344 192 0 163 3 0 3 3 0 8 0 fdescpl 528 595 0 563 3 0 3 3 0 8 0 filepl 160 3211 0 2974 20 2 18 20 0 8 7 lockfpl 104 127 0 125 1 0 1 1 0 8 0 lockfspl 48 27 0 25 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 300 0 285 1 0 1 1 0 8 0 zombiepl 144 567 0 563 1 0 1 1 0 8 0 processpl 1232 611 0 563 5 0 5 5 0 8 1 procpl 664 927 0 874 6 0 6 6 0 8 0 sockpl 752 624 0 588 17 5 12 17 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1031 0 0 65 0 65 65 0 8 0 bufpl 280 2820 0 131 193 0 193 193 0 8 0 anonpl 32 11800 0 0 96 0 96 96 0 246 0 amapchunkpl 152 13934 0 13435 32 0 32 32 0 158 7 amappl16 200 2181 0 2150 16 1 15 15 0 8 11 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 426 0 425 1 0 1 1 0 8 0 amappl12 168 952 0 910 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 255 0 254 1 0 1 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 117 0 116 1 0 1 1 0 8 0 amappl6 120 275 0 262 1 0 1 1 0 8 0 amappl5 112 76 0 66 1 0 1 1 0 8 0 amappl4 104 416 0 385 1 0 1 1 0 8 0 amappl3 96 2220 0 2130 4 1 3 3 0 8 0 amappl2 88 707 0 630 2 0 2 2 0 8 0 amappl1 80 9661 0 9072 14 0 14 14 0 8 1 amappl 88 3861 0 3692 5 0 5 5 0 92 0 uvmvnodes 80 2007 0 0 41 0 41 41 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 128 254 0 254 2 1 1 1 0 8 1 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 595 0 563 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 595 0 563 1 0 1 1 0 8 0 vmmpekpl 168 6837 0 6798 2 0 2 2 0 8 0 vmmpepl 168 45087 0 43126 97 0 97 97 0 357 10 vmsppl 488 594 0 563 5 0 5 5 0 8 1 rwobjpl 80 17227 0 14288 66 1 65 65 0 8 4 pdppl 4096 1197 0 1126 97 26 71 85 0 8 0 pvpl 32 21208 0 0 172 0 172 172 0 265 0 pmappl 256 594 0 563 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 321 0 28 9 0 9 9 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(ffffffff833956d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d22f8,ffffffff833dddd1,3b9,ffffffff83407984) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff8338dd6f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff8000ffff2018) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003b3f4290) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fa70980,41,fffffd80097fb2d8,ffff8000ffff2018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bbc3c28,ffff8000ffff2018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bbc3c28,ffff8000ffff2018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bbc3c28,ffff8000ffff2018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000ffff2018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000ffff2018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2018,ffff80003b3f4600,ffff80003b3f4550) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003b3f4600) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b3f4600) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7883ad6bdd20, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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(ffffffff8393fce0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8393fce0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 syscall(ffff8000333ee8c0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000333ee8c0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71cb96924b90, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff8393fce0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8393fce0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 syscall(ffff8000333ee8c0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000333ee8c0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71cb96924b90, count: -6