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 87180 14489 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b902a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb58d,ffffffff8350dec8,3bb,ffffffff8353705e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3ed8a8,ffffffff834b31e9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c3ed8a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff8000fffeb4e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3df280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffff4006c304e58,1,fffff400097fd340,ffff8000fffeb4e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffff4006c668900,ffff8000fffeb4e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffff4006c668900,ffff8000fffeb4e0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffeb4e0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffeb4e0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffeb4e0,ffff80003c3df5f0,ffff80003c3df540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c3df5e0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b902a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb58d,ffffffff8350dec8,3bb,ffffffff8353705e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3ed8a8,ffffffff834b31e9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c3ed8a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff8000fffeb4e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3df280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffff4006c304e58,1,fffff400097fd340,ffff8000fffeb4e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffff4006c668900,ffff8000fffeb4e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffff4006c668900,ffff8000fffeb4e0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffeb4e0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffeb4e0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffeb4e0,ffff80003c3df5f0,ffff80003c3df540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3df5f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3df5f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x737405fc6d10, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3df050 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff8000fffeb4e0 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x359276c082732a31 r11 0xeba66c41f569477d r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff810076a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3df040 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=387503 pid=10712 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=62, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffeb4e0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000ffff3240,0xffff8000ffff27f0 process=0xffff80003c3d3040 user=0xffff80003c3da000, vmspace=0xfffff4006c2f3208 estcpu=12, cpticks=111, pctcpu=1.6, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14489 87180 87544 0 7 0 syz-executor 14489 239457 87544 0 3 0x4000080 kqsel syz-executor 14489 358303 87544 0 3 0x4000000 smrbar syz-executor 76118 169750 26647 0 3 0x82 piperd syz-executor 16684 244603 26647 0 3 0x82 piperd syz-executor 66573 16531 26647 0 3 0x82 piperd syz-executor 80020 173821 26647 0 3 0x82 nanoslp syz-executor 81266 197493 26647 0 3 0x82 nanoslp syz-executor 40261 33732 26647 0 3 0x82 piperd syz-executor 87544 502432 26647 0 3 0x82 nanoslp syz-executor 26647 183193 47849 0 3 0x82 wait syz-executor 47849 518011 75777 0 3 0x10008a sigsusp ksh 75777 270660 984 0 3 0x98 kqread sshd-session 984 317975 79667 0 3 0x92 kqread sshd-session 17597 271508 1 0 3 0x100083 ttyin getty 79667 132328 1 0 3 0x88 kqread sshd 11284 476319 88679 74 3 0x1100092 bpf pflogd 88679 464768 1 0 3 0x80 sbwait pflogd 13120 442541 610 73 3 0x1100090 kqread syslogd 610 490631 1 0 3 0x100082 sbwait syslogd 88590 198474 1 0 3 0x100080 kqread resolvd 45207 507252 34823 77 3 0x100092 kqread dhcpleased 21480 47335 34823 77 3 0x100092 kqread dhcpleased 34823 224883 1 0 3 0x80 kqread dhcpleased 68513 186045 0 0 3 0x14200 bored smr 26828 134664 0 0 3 0x14200 pgzero zerothread 1689 164157 0 0 3 0x14200 aiodoned aiodoned 47719 451767 0 0 3 0x14200 syncer update 66433 34784 0 0 3 0x14200 cleaner cleaner 24974 277984 0 0 2 0x14200 reaper 61710 68218 0 0 3 0x14200 pgdaemon pagedaemon 41107 440000 0 0 3 0x14200 bored viomb 60474 156842 0 0 3 0x40014200 acpi0 acpi0 69643 73464 0 0 3 0x40014200 idle1 249 98146 0 0 3 0x14200 bored softnet1 16489 252156 0 0 3 0x14200 bored softnet0 46023 503444 0 0 3 0x14200 smrbar systqmp 34363 428456 0 0 3 0x14200 bored systq 77971 468618 0 0 3 0x14200 tmoslp softclockmp 61123 146868 0 0 3 0x40014200 tmoslp softclock 28891 381963 0 0 3 0x40014200 idle0 1 296352 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 46023 (systqmp) thread 0xffff8000ffffea60 (503444) shared rwlock systqmp r = 0 (0xffffffff83930828) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11062 12094K 12150K 166960K 12163 0 pcb 17 12K 12K 166960K 21 0 rtable 223 7K 7K 166960K 361 0 pf 41 18K 20K 166960K 58 0 ifaddr 45 7K 8K 166960K 55 0 ifgroup 66 2K 3K 166960K 72 0 sysctl 1 1K 9K 166960K 5 0 counters 84 38K 38K 166960K 90 0 ioctlops 0 0K 4K 166960K 1492 0 iov 0 0K 1K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1294 81K 81K 166960K 1371 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 45K 93K 166960K 142 0 proc 69 115K 164K 166960K 551 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 90 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 382 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 176K 166960K 3145 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 38 76K 104K 166960K 1298 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 18 0K 1K 166960K 33 0 temp 34 9110K 9116K 166960K 3897 0 kqueue 15 22K 26K 166960K 29 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 34 0 31 1 0 1 1 0 8 0 rtentry 176 114 0 13 6 0 6 6 0 8 0 unpcb 144 44 0 27 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 8 0 4 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 71 0 62 1 0 1 1 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 7 0 2 1 0 1 1 0 8 0 pppxif 1576 3 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 20 0 0 3 0 3 3 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 0 30 0 30 30 0 8 0 art_table 40 466 0 0 5 0 5 5 0 8 0 art_node 32 114 0 12 1 0 1 1 0 8 0 semapl 72 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1583 0 111 92 0 92 92 0 8 0 ffsino 296 1583 0 111 114 0 114 114 0 8 0 nchpl 144 1781 0 76 64 0 64 64 0 8 0 rtmask 32 2 0 1 1 0 1 1 0 8 0 vnodes 216 1677 0 0 94 0 94 94 0 8 0 namei 1024 5457 0 5457 2 0 2 2 0 8 2 percpumem 16 60 0 3 1 0 1 1 0 8 0 kstatmem 264 37 0 4 3 0 3 3 0 8 0 scxspl 216 6174 0 6174 3 2 1 2 1 8 1 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 459 0 416 7 0 7 7 0 8 1 knotepl 120 65 0 0 2 0 2 2 0 8 0 kqueuepl 224 27 0 16 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 443 0 416 3 0 3 3 0 8 0 filepl 160 1600 0 1383 10 0 10 10 0 8 0 lockfpl 104 12 0 10 1 0 1 1 0 8 0 lockfspl 48 7 0 5 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 91 0 78 1 0 1 1 0 8 0 zombiepl 144 419 0 416 1 0 1 1 0 8 0 processpl 1232 459 0 416 5 0 5 5 0 8 0 procpl 664 482 0 436 5 0 5 5 0 8 0 sockpl 752 149 0 120 4 0 4 4 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 163 0 0 11 0 11 11 0 8 0 bufpl 280 2286 0 105 156 0 156 156 0 8 0 anonpl 32 3692 0 0 30 0 30 30 0 246 0 amapchunkpl 152 8388 0 8024 18 0 18 18 0 158 1 amappl16 200 1452 0 1440 5 1 4 5 0 8 3 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 428 0 427 1 0 1 1 0 8 0 amappl13 176 121 0 109 1 0 1 1 0 8 0 amappl12 168 693 0 667 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 95 0 93 1 0 1 1 0 8 0 amappl7 128 149 0 136 1 0 1 1 0 8 0 amappl6 120 154 0 153 1 0 1 1 0 8 0 amappl5 112 98 0 88 1 0 1 1 0 8 0 amappl4 104 294 0 273 1 0 1 1 0 8 0 amappl3 96 1490 0 1405 3 0 3 3 0 8 0 amappl2 88 538 0 481 2 0 2 2 0 8 0 amappl1 80 10422 0 9838 15 0 15 15 0 8 1 amappl 88 2419 0 2293 4 0 4 4 0 92 0 uvmvnodes 80 100 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 128 254 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 443 0 416 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 443 0 416 1 0 1 1 0 8 0 vmmpekpl 168 5816 0 5779 2 0 2 2 0 8 0 vmmpepl 168 37462 0 35790 86 0 86 86 0 357 2 vmsppl 488 442 0 416 5 0 5 5 0 8 0 rwobjpl 80 14188 0 13222 24 0 24 24 0 8 1 pdppl 4096 893 0 832 97 20 77 85 0 8 16 pvpl 32 9852 0 0 80 0 80 80 0 265 0 pmappl 256 442 0 416 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 267 0 23 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8399fff0) 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(ffffffff83b40c40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b40c40) 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 end of kernel end trace frame: 0x7d8776f040a0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff8399fff0) 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(ffffffff83b40c40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b40c40) 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 end of kernel end trace frame: 0x7d8776f040a0, count: -7 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(ffffffff834b902a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb58d,ffffffff8350dec8,3bb,ffffffff8353705e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3ed8a8,ffffffff834b31e9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c3ed8a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff8000fffeb4e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3df280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffff4006c304e58,1,fffff400097fd340,ffff8000fffeb4e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffff4006c668900,ffff8000fffeb4e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffff4006c668900,ffff8000fffeb4e0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffeb4e0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffeb4e0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffeb4e0,ffff80003c3df5f0,ffff80003c3df540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c3df5e0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b902a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fb58d,ffffffff8350dec8,3bb,ffffffff8353705e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c3ed8a8,ffffffff834b31e9) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c3ed8a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff8000fffeb4e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3df280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffff4006c304e58,1,fffff400097fd340,ffff8000fffeb4e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffff4006c668900,ffff8000fffeb4e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffff4006c668900,ffff8000fffeb4e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffff4006c668900,ffff8000fffeb4e0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffeb4e0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffeb4e0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffeb4e0,ffff80003c3df5f0,ffff80003c3df540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3df5f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3df5f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x737405fc6d10, count: -16