panic: kernel diagnostic assertion "uvn->u_obj.uo_refs == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_vnode.c", line 234 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *519140 11780 32767 0x10 0x4000000 0K syz-executor.2 156126 941 0 0x2 0x4000000 1 syz-fuzzer db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259c076) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613fdf,ffffffff8263970b,ea,ffffffff82631caa) at __assert+0x25 sys/kern/subr_prf.c:161 uvn_attach(fffffd80706222b8,6) at uvn_attach+0x444 sys/uvm/uvm_vnode.c:234 uvm_mmapfile(fffffd80681e2b98,ffff80002e44ad68,10000,2,6,11,a2ac1576488e1d2d,fffffd80681e2b98,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff800021259a40,ffff80002e44ae10,ffff80002e44aee0) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff800021259a40,ffff80002e44ae98,ffff80002e44aee0) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff80002e44af60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e44af60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbeebf653460, count: 6 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 "uvn->u_obj.uo_refs == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_vnode.c", line 234 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259c076) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613fdf,ffffffff8263970b,ea,ffffffff82631caa) at __assert+0x25 sys/kern/subr_prf.c:161 uvn_attach(fffffd80706222b8,6) at uvn_attach+0x444 sys/uvm/uvm_vnode.c:234 uvm_mmapfile(fffffd80681e2b98,ffff80002e44ad68,10000,2,6,11,a2ac1576488e1d2d,fffffd80681e2b98,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff800021259a40,ffff80002e44ae10,ffff80002e44aee0) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff800021259a40,ffff80002e44ae98,ffff80002e44aee0) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff80002e44af60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e44af60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbeebf653460, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e44aa00 rbx 0xffffffff82994bb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff800021259a40 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf52b8e5b3d0079ec r11 0x1a896f9b2bc9a3db r12 0xffffffff829949b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff820a5788 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e44a9f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=519140 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021259260,0xffff800021258fd0 process=0xffff8000ffff94d0 user=0xffff80002e446000, vmspace=0xfffffd80681e2b98 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11780 82317 32636 32767 3 0x90 nanoslp syz-executor.2 *11780 519140 32636 32767 7 0x4000010 syz-executor.2 11780 425133 32636 32767 3 0x4000090 fsleep syz-executor.2 11780 161112 32636 32767 3 0x4000090 fsleep syz-executor.2 64026 213437 31920 32767 2 0x10 syz-executor.3 64026 543 31920 32767 2 0x4000010 syz-executor.3 50634 48125 56177 32767 2 0x10 syz-executor.5 56177 418014 941 0 3 0x82 wait syz-executor.5 14759 13607 78819 32767 2 0x10 syz-executor.1 78819 512715 941 0 3 0x82 wait syz-executor.1 41590 374087 98553 32767 3 0x90 piperd syz-executor.6 98553 513089 941 0 3 0x82 wait syz-executor.6 53830 134152 64852 32767 2 0x10 syz-executor.0 64852 385885 941 0 3 0x82 wait syz-executor.0 31920 502205 64979 32767 2 0x490 syz-executor.3 64979 394610 941 0 3 0x82 wait syz-executor.3 66038 46287 43792 32767 2 0x10 syz-executor.7 43792 308746 941 0 3 0x82 wait syz-executor.7 18869 121908 17311 32767 2 0x490 syz-executor.4 17311 459872 941 0 3 0x82 wait syz-executor.4 33859 402303 0 0 3 0x14200 bored sosplice 32636 407324 13903 32767 2 0x490 syz-executor.2 13903 264151 941 0 3 0x82 wait syz-executor.2 941 149281 63788 0 3 0x82 thrsleep syz-fuzzer 941 163393 63788 0 3 0x4000082 nanoslp syz-fuzzer 941 210664 63788 0 3 0x4000082 thrsleep syz-fuzzer 941 515980 63788 0 3 0x4000082 thrsleep syz-fuzzer 941 522697 63788 0 3 0x4000082 thrsleep syz-fuzzer 941 424199 63788 0 2 0x4000082 syz-fuzzer 941 171474 63788 0 3 0x4000082 thrsleep syz-fuzzer 941 156126 63788 0 7 0x4000002 syz-fuzzer 941 494961 63788 0 3 0x4000082 thrsleep syz-fuzzer 63788 517179 37931 0 3 0x10008a sigsusp ksh 37931 440523 20859 0 3 0x9a kqread sshd 99941 266971 1 0 3 0x100083 ttyin getty 20859 237884 1 0 3 0x88 kqread sshd 32179 405128 18955 73 3 0x1100090 kqread syslogd 18955 441090 1 0 3 0x100082 netio syslogd 85006 38078 1 0 3 0x100080 kqread resolvd 28562 152898 2152 77 3 0x100092 kqread dhcpleased 70748 168848 2152 77 3 0x100092 kqread dhcpleased 2152 258166 1 0 3 0x80 kqread dhcpleased 66212 92417 0 0 3 0x14200 bored smr 81989 140430 0 0 2 0x14200 zerothread 23081 289380 0 0 3 0x14200 aiodoned aiodoned 90457 371091 0 0 3 0x14200 syncer update 14 49193 0 0 3 0x14200 cleaner cleaner 33153 21685 0 0 3 0x14200 reaper reaper 26233 33077 0 0 3 0x14200 pgdaemon pagedaemon 75973 160012 0 0 3 0x14200 bored viomb 72369 477984 0 0 3 0x40014200 acpi0 acpi0 7575 491632 0 0 3 0x40014200 idle1 2602 100037 0 0 3 0x14200 bored softnet 76186 424484 0 0 3 0x14200 bored softnet 94325 266956 0 0 3 0x14200 bored softnet 67459 329763 0 0 3 0x14200 bored softnet 67229 416833 0 0 3 0x14200 bored systqmp 54569 142823 0 0 3 0x14200 bored systq 74273 71614 0 0 2 0x40014200 softclock 89706 192221 0 0 3 0x40014200 idle0 1 382424 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 11780 (syz-executor.2) thread 0xffff800021259a40 (519140) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82b1e128) #0 witness_lock+0x44d #1 syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] #1 syscall+0x41d sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 14759 (syz-executor.1) thread 0xffff8000fffeed20 (13607) exclusive rrwlock inode r = 0 (0xfffffd8070286d58) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1150 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 #10 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #10 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd805bdac3d8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:567 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3101 #8 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #8 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10232 6415K 6419K 78643K 11435 0 pcb 13 12K 14K 78643K 17 0 rtable 238 6K 7K 78643K 2915 0 ifaddr 81 17K 17K 78643K 343 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 35K 78643K 130 0 ioctlops 0 0K 2K 78643K 569 0 iov 0 0K 32K 78643K 3127 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 4751 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 201 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 4379 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 21 77K 117K 78643K 17127 0 sigio 0 0K 0K 78643K 96 0 proc 56 78K 115K 78643K 2856 0 subproc 104 6K 6K 78643K 585 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1388 0 in_multi 99 6K 7K 78643K 767 0 ether_multi 1 0K 0K 78643K 66 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 391 1738K 1738K 78643K 391 0 exec 0 0K 2K 78643K 4546 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 349 103K 107K 78643K 106603 0 UVM aobj 131 8K 8K 78643K 141 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 473 0 NDP 11 0K 2K 78643K 138 0 temp 124 4722K 4850K 78643K 45883 0 kqueue 12 18K 30K 78643K 3380 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1719 0 1716 24 23 1 5 0 8 0 rtentry 112 540 0 428 4 0 4 4 0 8 0 unpcb 144 40260 0 40245 199 193 6 10 0 8 5 syncache 296 185 0 185 39 38 1 1 0 8 1 tcpqe 32 57 0 57 21 20 1 1 0 8 1 tcpcb 736 7672 0 7657 220 217 3 20 0 8 0 arp 120 99 0 80 1 0 1 1 0 8 0 ipq 40 8 0 8 3 3 0 1 0 8 0 ipqe 40 20 0 20 3 3 0 1 0 8 0 inpcb 320 19596 0 19582 240 233 7 15 0 8 5 nd6 48 150 0 125 1 0 1 1 0 8 0 kcovpl 48 45 0 37 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2144 0 1683 31 2 29 30 0 8 0 art_table 32 2145 0 1683 4 0 4 4 0 8 0 art_node 16 539 0 437 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 4343 0 4333 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 24003 0 22522 94 0 94 94 0 8 0 ffsino 272 24003 0 22522 100 0 100 100 0 8 0 nchpl 144 46983 0 45346 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 164104 0 164103 2 1 1 2 0 8 0 percpumem 16 77 0 37 1 0 1 1 0 8 0 kstatmem 264 96 0 74 2 0 2 2 0 8 0 scxspl 216 131936 0 131936 51 50 1 8 0 8 1 plimitpl 152 4111 0 4089 13 11 2 2 0 8 1 sigapl 424 17331 0 17281 7 0 7 7 0 8 0 futexpl 64 158876 0 158874 2 1 1 1 0 8 0 knotepl 120 1242 0 0 17 0 17 17 0 8 0 kqueuepl 216 7447 0 7439 96 94 2 8 0 8 1 pipepl 320 4190 0 4162 106 98 8 13 0 8 4 fdescpl 496 17313 0 17281 7 1 6 6 0 8 0 filepl 152 142296 0 142055 238 218 20 23 0 8 8 lockfpl 104 2182 0 2179 3 2 1 2 0 8 0 lockfspl 48 645 0 642 1 0 1 1 0 8 0 sessionpl 144 60 0 44 1 0 1 1 0 8 0 pgrppl 48 361 0 345 1 0 1 1 0 8 0 ucredpl 104 20734 0 20716 1 0 1 1 0 8 0 zombiepl 144 17282 0 17281 1 0 1 1 0 8 0 processpl 1064 17331 0 17281 4 0 4 4 0 8 0 procpl 672 52343 0 52281 40 33 7 8 0 8 1 sosppl 168 236 0 235 31 30 1 1 0 8 0 sockpl 488 62142 0 62110 1233 1212 21 42 0 8 16 mcl64k 65536 33 0 0 3 0 3 3 0 8 0 mcl16k 16384 35 0 0 4 1 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 41 0 0 4 1 3 3 0 8 0 mcl4k 4096 65 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 418 0 0 20 2 18 20 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 5041 0 0 286 0 286 286 0 8 0 bufpl 288 28913 0 22586 453 0 453 453 0 8 0 anonpl 24 3601106 0 3588408 203 98 105 115 0 186 0 amapchunkpl 152 346445 0 345685 165 126 39 45 0 158 9 amappl16 200 53303 0 52912 260 230 30 37 0 8 6 amappl15 192 1649 0 1647 1 0 1 1 0 8 0 amappl14 184 596 0 591 1 0 1 1 0 8 0 amappl13 176 2621 0 2614 1 0 1 1 0 8 0 amappl12 168 6274 0 6267 1 0 1 1 0 8 0 amappl11 160 875 0 860 1 0 1 1 0 8 0 amappl10 152 2332 0 2323 1 0 1 1 0 8 0 amappl9 144 1860 0 1854 1 0 1 1 0 8 0 amappl8 136 4016 0 3834 7 0 7 7 0 8 0 amappl7 128 2556 0 2544 1 0 1 1 0 8 0 amappl6 120 1782 0 1758 2 1 1 2 0 8 0 amappl5 112 16414 0 16394 1 0 1 1 0 8 0 amappl4 104 4187 0 4147 2 0 2 2 0 8 0 amappl3 96 59425 0 59374 2 0 2 2 0 8 0 amappl2 88 22142 0 22064 3 1 2 3 0 8 0 amappl1 80 415792 0 415146 19 3 16 19 0 8 0 amappl 88 104723 0 104548 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 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 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 17313 0 17281 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17313 0 17281 1 0 1 1 0 8 0 vmmpekpl 168 144150 0 144093 4 0 4 4 0 8 0 vmmpepl 168 1722462 0 1719838 347 207 140 145 0 357 7 vmsppl 368 17312 0 17281 4 0 4 4 0 8 0 rwobjpl 56 434715 0 427189 128 17 111 111 0 8 0 pdppl 4096 34633 0 34562 625 544 81 91 0 8 10 pvpl 32 6807779 0 6789804 656 471 185 254 0 265 5 pmappl 248 17312 0 17281 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1857 0 771 32 0 32 32 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259c076) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613fdf,ffffffff8263970b,ea,ffffffff82631caa) at __assert+0x25 sys/kern/subr_prf.c:161 uvn_attach(fffffd80706222b8,6) at uvn_attach+0x444 sys/uvm/uvm_vnode.c:234 uvm_mmapfile(fffffd80681e2b98,ffff80002e44ad68,10000,2,6,11,a2ac1576488e1d2d,fffffd80681e2b98,0,11) at uvm_mmapfile+0x194 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff800021259a40,ffff80002e44ae10,ffff80002e44aee0) at sys_mmap+0xb4a sys/uvm/uvm_mmap.c:395 sys_pad_mmap(ffff800021259a40,ffff80002e44ae98,ffff80002e44aee0) at sys_pad_mmap+0x68 sys/uvm/uvm_mmap.c:470 syscall(ffff80002e44af60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e44af60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbeebf653460, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b1df20) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b1df20) at __mp_lock+0x129 sys/kern/kern_lock.c:147 kqueue_scan(ffff8000213381d0,8,ffff8000213382d0,ffff8000213383d0,ffff8000fffeefc0,ffff80002133842c) at kqueue_scan+0xf7 sys/kern/kern_event.c:1299 sys_kevent(ffff8000fffeefc0,ffff800021338490,ffff8000213384e0) at sys_kevent+0x4a4 sys/kern/kern_event.c:984 syscall(ffff800021338560) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800021338560) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x221e0ade0, count: 7 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b1df20) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b1df20) at __mp_lock+0x129 sys/kern/kern_lock.c:147 kqueue_scan(ffff8000213381d0,8,ffff8000213382d0,ffff8000213383d0,ffff8000fffeefc0,ffff80002133842c) at kqueue_scan+0xf7 sys/kern/kern_event.c:1299 sys_kevent(ffff8000fffeefc0,ffff800021338490,ffff8000213384e0) at sys_kevent+0x4a4 sys/kern/kern_event.c:984 syscall(ffff800021338560) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800021338560) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x221e0ade0, count: -8