login: panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 959 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 96543 46183 0 0 0 1 syz-executor *509788 54816 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bbaa2) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb2b3,ffffffff8350de03,3bf,ffffffff83536f5b) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3f3770,ffffffff834b53cd) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(ffff80002af80000,ffff80003c3f3768) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff80003b7a82c0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c40b060) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffee005fd13a38,81,ffffee00097fd478,ffff80003b7a82c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffee006c6d3408,ffff80003b7a82c0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffee006c6d3408,ffff80003b7a82c0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c40b2c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40b2c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fc8a5dfd0, count: 2 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 959 ddb{0}> show kasan No such command ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bbaa2) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb2b3,ffffffff8350de03,3bf,ffffffff83536f5b) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3f3770,ffffffff834b53cd) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(ffff80002af80000,ffff80003c3f3768) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff80003b7a82c0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c40b060) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffee005fd13a38,81,ffffee00097fd478,ffff80003b7a82c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffee006c6d3408,ffff80003b7a82c0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffee006c6d3408,ffff80003b7a82c0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c40b2c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40b2c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fc8a5dfd0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c40ae20 rbx 0xffffffff838fae07 cpu_info_full_primary+0x2e07 rdx 0xffff8000015d6e40 rcx 0xffff80003b7a82c0 rax 0xffffffff838f9ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x723939cf2b992f02 r11 0x7dc8541136e9c3f7 r12 0xffffffff838fac08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff81809cc5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c40ae10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=509788 pid=54816 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b7a94e8,0xffff80003b7a8038 process=0xffff80003b7a7510 user=0xffff80003c406000, vmspace=0xffffee006fbab990 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 39352 479723 95149 0 2 0 0 syz-executor 39352 337158 95149 0 3 0 0x4000080 kqread syz-executor 39352 416560 95149 0 3 0 0x4000080 fsleep syz-executor 46183 96543 13941 0 7 0 0 syz-executor 46183 237636 13941 0 3 0 0x4000080 fsleep syz-executor 54816 57440 96768 0 2 0 0 syz-executor 54816 389719 96768 0 3 0 0x4000000 smrbar syz-executor *54816 509788 96768 0 7 0 0x4000000 syz-executor 54816 282866 96768 0 3 0 0x4000080 fsleep syz-executor 35983 168132 60195 0 2 0 0 syz-executor 35983 170744 60195 0 3 0 0x4000080 fsleep syz-executor 35983 39581 60195 0 3 0 0x4000080 fsleep syz-executor 43452 57316 52809 0 2 0 0 syz-executor 43452 128813 52809 0 3 0 0x4000080 fsleep syz-executor 43452 111291 52809 0 3 0 0x4000080 fsleep syz-executor 82779 68285 44425 0 2 0 0 syz-executor 82779 202933 44425 0 3 0 0x4000080 fsleep syz-executor 82779 463111 44425 0 3 0 0x4000080 fsleep syz-executor 75464 144324 1 0 3 0x100003 0x80 ttyin getty 95149 248391 42307 0 2 0x2 0xc80 syz-executor 37364 11152 42307 0 2 0x2 0xc80 syz-executor 22825 304065 42307 0 2 0x2 0 syz-executor 44425 553 42307 0 2 0x2 0xc80 syz-executor 13941 201423 42307 0 2 0x2 0xc80 syz-executor 60195 339801 42307 0 2 0x2 0xc80 syz-executor 96768 239667 42307 0 2 0x2 0xc80 syz-executor 52809 288779 42307 0 2 0x2 0xc80 syz-executor 42307 336353 3552 0 3 0x2 0x80 kqread syz-executor 3552 176642 11496 0 3 0x100002 0x88 sigsusp ksh 11496 98776 88428 0 3 0x10 0x88 kqread sshd-session 88428 171560 1811 0 3 0x12 0x80 kqread sshd-session 1811 279084 1 0 3 0 0x88 kqread sshd 46462 138320 33084 74 3 0x1100012 0x80 bpf pflogd 33084 447137 1 0 3 0 0x80 sbwait pflogd 26908 443608 18487 73 3 0x1100010 0x80 kqread syslogd 18487 203063 1 0 3 0x100002 0x80 sbwait syslogd 58502 120759 1 0 3 0x100000 0x80 kqread resolvd 25114 339447 6562 77 3 0x100012 0x80 kqread dhcpleased 800 153123 6562 77 3 0x100012 0x80 kqread dhcpleased 6562 24968 1 0 3 0 0x80 kqread dhcpleased 49828 512079 0 0 2 0x14000 0x40000200 smr 86087 252683 0 0 3 0x14000 0x200 pgzero zerothread 16095 124216 0 0 3 0x14000 0x200 aiodoned aiodoned 53336 172873 0 0 3 0x14000 0x200 syncer update 990 381648 0 0 3 0x14000 0x200 cleaner cleaner 58703 49080 0 0 3 0x14000 0x200 reaper reaper 75125 285986 0 0 3 0x14000 0x200 pgdaemon pagedaemon 20370 351157 0 0 3 0x14000 0x200 bored viomb 59628 264063 0 0 3 0x14000 0x40000200 acpi0 acpi0 50331 143214 0 0 3 0x14000 0x40000200 idle1 81268 390748 0 0 3 0x14000 0x200 bored softnet1 92977 34428 0 0 3 0x14000 0x200 bored softnet0 91255 380152 0 0 3 0x14000 0x200 bored systqmp 6070 146833 0 0 3 0x14000 0x200 bored systq 22098 334731 0 0 2 0x14000 0x200 softclockmp 89442 399165 0 0 3 0x14000 0x40000200 tmoslp softclock 49076 433350 0 0 3 0x14000 0x40000200 idle0 1 262793 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10010000 0x200 scheduler swapper ddb{0}> show all locks Process 46183 (syz-executor) thread 0xffff80003bfb2fb0 (96543) Process 54816 (syz-executor) thread 0xffff80003b7a82c0 (509788) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11092 12100K 12431K 166960K 12419 0 pcb 17 12K 12K 166960K 68 0 rtable 247 8K 8K 166960K 393 0 pf 37 18K 24K 166960K 105 0 ifaddr 44 7K 7K 166960K 57 0 ifgroup 60 2K 2K 166960K 75 0 sysctl 1 1K 9K 166960K 6 0 counters 74 37K 37K 166960K 88 0 ioctlops 0 0K 4K 166960K 1527 0 iov 0 0K 16K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1326 83K 84K 166960K 1542 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 13 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 89K 166960K 361 0 sigio 1 0K 0K 166960K 3 0 proc 72 115K 164K 166960K 577 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 23 0 in_multi 96 7K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 420 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 271 160K 179K 166960K 5092 0 UVM aobj 6 2K 2K 166960K 7 0 pinsyscall 43 86K 100K 166960K 1521 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 13 0K 2K 166960K 35 0 temp 38 9114K 9122K 166960K 7126 0 kqueue 16 26K 28K 166960K 61 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 44 0 41 1 0 1 1 0 8 0 rtentry 176 121 0 10 6 0 6 6 0 8 0 unpcb 144 439 0 420 8 0 8 8 0 8 7 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 114 0 110 7 0 7 7 0 8 6 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 290 0 282 7 0 7 7 0 8 6 nd6 152 28 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 6 0 5 1 0 1 1 0 8 0 pppxif 1576 3 0 2 1 0 1 1 0 8 0 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 2 0 2 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 9 0 4 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 33 0 0 1 0 1 1 0 8 0 pfstkey 128 33 0 0 2 0 2 2 0 8 0 pfstate 448 33 0 0 4 0 4 4 0 8 0 pfrule 1360 24 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 516 0 46 31 0 31 31 0 8 1 art_table 40 517 0 46 5 0 5 5 0 8 0 art_node 32 121 0 19 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 9 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1961 0 490 93 0 93 93 0 8 0 ffsino 296 1961 0 490 114 0 114 114 0 8 0 nchpl 144 2471 0 760 64 0 64 64 0 8 0 vnodes 216 2167 0 0 121 0 121 121 0 8 0 namei 1024 8032 0 8032 1 0 1 1 0 8 1 percpumem 16 60 0 7 1 0 1 1 0 8 0 kstatmem 264 39 0 10 3 0 3 3 0 8 1 scxspl 216 8554 0 8554 10 3 7 7 1 8 7 plimitpl 152 52 0 35 1 0 1 1 0 8 0 sigapl 424 680 0 632 7 0 7 7 0 8 1 knotepl 120 542 0 0 17 0 17 17 0 8 0 kqueuepl 224 75 0 62 1 0 1 1 0 8 0 pipepl 344 136 0 109 3 0 3 3 0 8 0 fdescpl 528 663 0 631 3 0 3 3 0 8 0 filepl 160 3300 0 3069 21 0 21 21 0 8 8 lockfpl 104 193 0 191 2 0 2 2 0 8 1 lockfspl 48 79 0 77 1 0 1 1 0 8 0 sessionpl 144 34 0 25 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 424 0 411 1 0 1 1 0 8 0 zombiepl 144 634 0 632 1 0 1 1 0 8 0 processpl 1232 680 0 632 5 0 5 5 0 8 0 procpl 664 1053 0 993 6 0 6 6 0 8 0 sockpl 752 785 0 755 30 6 24 30 0 8 21 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 188 0 0 12 0 12 12 0 8 0 bufpl 272 2673 0 108 171 0 171 171 0 8 0 anonpl 32 7725 0 0 63 0 63 63 0 247 0 amapchunkpl 152 15726 0 15085 35 0 35 35 0 158 10 amappl16 200 2283 0 2044 15 2 13 13 0 8 0 amappl15 192 54 0 53 2 1 1 1 0 8 0 amappl14 184 433 0 432 1 0 1 1 0 8 0 amappl13 176 173 0 161 1 0 1 1 0 8 0 amappl12 168 916 0 883 2 0 2 2 0 8 0 amappl11 160 14 0 14 1 1 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 277 0 277 1 1 0 1 0 8 0 amappl8 136 98 0 95 1 0 1 1 0 8 0 amappl7 128 148 0 135 1 0 1 1 0 8 0 amappl6 120 157 0 155 1 0 1 1 0 8 0 amappl5 112 94 0 84 1 0 1 1 0 8 0 amappl4 104 300 0 279 1 0 1 1 0 8 0 amappl3 96 2994 0 2855 4 0 4 4 0 8 0 amappl2 88 538 0 476 2 0 2 2 0 8 0 amappl1 80 11384 0 10768 15 0 15 15 0 8 2 amappl 88 4323 0 4124 5 0 5 5 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 0 8 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 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 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 663 0 631 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 663 0 631 1 0 1 1 0 8 0 vmmpekpl 168 7299 0 7268 2 0 2 2 0 8 0 vmmpepl 168 51111 0 48883 97 0 97 97 0 357 0 vmsppl 488 662 0 631 5 0 5 5 0 8 1 rwobjpl 80 17378 0 16066 27 0 27 27 0 8 0 pdppl 4096 1333 0 1262 95 24 71 83 0 8 0 pvpl 32 14925 0 0 121 0 121 121 0 265 0 pmappl 256 662 0 631 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 449 0 27 13 0 13 13 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(ffffffff834bbaa2) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb2b3,ffffffff8350de03,3bf,ffffffff83536f5b) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3f3770,ffffffff834b53cd) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(ffff80002af80000,ffff80003c3f3768) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff80003b7a82c0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c40b060) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffee005fd13a38,81,ffffee00097fd478,ffff80003b7a82c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffee006c6d3408,ffff80003b7a82c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffee006c6d3408,ffff80003b7a82c0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffee006c6d3408,ffff80003b7a82c0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c40b2c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40b2c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fc8a5dfd0, count: -13 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(ffffffff83a14fc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a14fc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(ffffee006cd739a8,a0a8aedd000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff800036b9d310,a0a8aedd000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800036b9d310) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7172de8cc480, 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(ffffffff83a14fc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a14fc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(ffffee006cd739a8,a0a8aedd000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff800036b9d310,a0a8aedd000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800036b9d310) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7172de8cc480, count: -8