uvm_fault(0xffffffff8350a120, 0xffff80001de9224d, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND * 95946 77448 0 0x2 0x1 1K syz-executor 456289 43159 0 0x14000 0x40000200 0 softclock memset() at memset+0x49 ffs_write(ffff8000371b07b0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d6c71e0,ffff8000371b0868,3,fffffd807f7d36e8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000ffff31d8,fffffd807d6c71e0,fffffd807f7d36e8,ffff8000371b0938,ffff8000371b0910) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 sys/kern/kern_ktrace.c:258 dofilewritev(ffff8000ffff31d8,f8,ffff8000371b0ab8,0,ffff8000371b0b70) at dofilewritev+0x4f3 sys/kern/sys_generic.c:401 sys_write(ffff8000ffff31d8,ffff8000371b0c20,ffff8000371b0b70) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000371b0c20) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371b0c20) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f140a2dcd20, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff8350a120, 0xffff80001de9224d, 0, 2) -> d ddb{1}> trace memset() at memset+0x49 ffs_write(ffff8000371b07b0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d6c71e0,ffff8000371b0868,3,fffffd807f7d36e8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000ffff31d8,fffffd807d6c71e0,fffffd807f7d36e8,ffff8000371b0938,ffff8000371b0910) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 sys/kern/kern_ktrace.c:258 dofilewritev(ffff8000ffff31d8,f8,ffff8000371b0ab8,0,ffff8000371b0b70) at dofilewritev+0x4f3 sys/kern/sys_generic.c:401 sys_write(ffff8000ffff31d8,ffff8000371b0c20,ffff8000371b0b70) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000371b0c20) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371b0c20) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f140a2dcd20, count: -9 ddb{1}> show registers rdi 0xffff80001de9224d rsi 0 rbp 0xffff8000371b06d0 rbx 0xa024d acpi_pdirpa+0x8c0be rdx 0x3 rcx 0x3 rax 0 r8 0x3db0 __ALIGN_SIZE+0x2db0 r9 0xffff8000371b0630 r10 0x660cfd954e52c65b r11 0xffff80001de9224d r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x24d r14 0xfffffd807d6c71e0 r15 0x1 rip 0xffffffff82abf5f9 memset+0x49 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff8000371b04c8 ss 0x10 memset+0x49: repe stosb %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=95946 pid=77448 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff2530,0xffff8000ffff3c08 process=0xffff8000fffeb668 user=0xffff8000371ab000, vmspace=0xfffffd806997c528 estcpu=36, cpticks=4, pctcpu=0.2, user=0, sys=7, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14886 454955 9084 0 2 0 syz-executor 14886 119153 9084 0 3 0x4000080 pipewr syz-executor 24994 346904 60770 0 2 0 syz-executor 24994 387107 60770 0 3 0x4000080 fsleep syz-executor 99311 321050 38955 0 2 0 syz-executor 99311 338716 38955 0 2 0x4000000 syz-executor 90253 309101 54805 0 2 0 syz-executor 90253 326131 54805 0 3 0x4000080 fsleep syz-executor 84497 491445 90817 0 2 0x480 syz-executor 84497 63753 90817 0 3 0x4000080 sbwait syz-executor 84497 83228 90817 0 3 0x4000080 fsleep syz-executor 84497 326416 90817 0 3 0x4000080 fsleep syz-executor 22097 154165 25010 0 2 0x490 syz-executor 22097 94176 25010 0 3 0x4000090 lockf syz-executor 22097 456782 25010 0 3 0x4000090 fsleep syz-executor 60770 17006 50282 0 2 0x482 syz-executor 9084 143070 50282 0 2 0x482 syz-executor 25010 79206 50282 0 2 0x2 syz-executor *77448 95946 50282 0 7 0x3 syz-executor 26211 498903 50282 0 2 0x482 syz-executor 54805 295267 50282 0 2 0x482 syz-executor 38955 467104 50282 0 2 0x2 syz-executor 90817 45051 50282 0 2 0x482 syz-executor 55527 149752 1 0 3 0x100083 ttyin getty 16327 508551 0 0 3 0x14200 acct acct 86970 422718 0 0 3 0x14280 nfsidl nfsio 97025 239212 0 0 3 0x14280 nfsidl nfsio 72045 366362 0 0 3 0x14280 nfsidl nfsio 78408 208025 0 0 3 0x14280 nfsidl nfsio 41610 517134 0 0 3 0x14280 nfsidl nfsio 47477 15266 0 0 3 0x14280 nfsidl nfsio 17651 51464 0 0 3 0x14280 nfsidl nfsio 24804 88348 0 0 3 0x14280 nfsidl nfsio 95149 457055 0 0 3 0x14280 nfsidl nfsio 2158 125328 0 0 3 0x14280 nfsidl nfsio 65193 298351 0 0 3 0x14280 nfsidl nfsio 61329 204073 0 0 3 0x14280 nfsidl nfsio 83837 162293 0 0 3 0x14280 nfsidl nfsio 75416 233778 0 0 3 0x14280 nfsidl nfsio 16983 259483 0 0 3 0x14280 nfsidl nfsio 42767 398174 0 0 3 0x14280 nfsidl nfsio 29848 437418 0 0 3 0x14280 nfsidl nfsio 8534 52757 0 0 3 0x14280 nfsidl nfsio 30896 235362 0 0 3 0x14280 nfsidl nfsio 99113 436842 0 0 3 0x14280 nfsidl nfsio 83727 349698 0 0 3 0x14200 bored sosplice 50282 378396 16160 0 2 0x82 syz-executor 16160 449256 23288 0 3 0x10008a sigsusp ksh 23288 179879 64475 0 3 0x98 kqread sshd-session 64475 7938 87410 0 3 0x92 kqread sshd-session 87410 160787 1 0 3 0x88 kqread sshd 46365 399628 21191 74 3 0x1100092 bpf pflogd 21191 91284 1 0 3 0x80 sbwait pflogd 61401 199494 47173 73 2 0x1100010 syslogd 47173 24164 1 0 3 0x100082 sbwait syslogd 7491 176931 1 0 3 0x100080 kqread resolvd 5382 195641 73692 77 3 0x100092 kqread dhcpleased 35872 263511 73692 77 3 0x100092 kqread dhcpleased 73692 492920 1 0 3 0x80 kqread dhcpleased 22036 455678 0 0 2 0x14200 smr 7599 20639 0 0 2 0x14200 zerothread 12649 430274 0 0 3 0x14200 aiodoned aiodoned 49337 221767 0 0 3 0x14200 syncer update 11611 345629 0 0 3 0x14200 cleaner cleaner 85271 208407 0 0 3 0x14200 reaper reaper 9626 173373 0 0 3 0x14200 pgdaemon pagedaemon 9352 519693 0 0 3 0x14200 bored viomb 21632 242552 0 0 3 0x40014200 acpi0 acpi0 76568 210692 0 0 3 0x40014200 idle1 5666 433162 0 0 3 0x14200 bored softnet3 77279 371112 0 0 3 0x14200 bored softnet2 84555 161232 0 0 3 0x14200 bored softnet1 47029 290586 0 0 3 0x14200 bored softnet0 80448 31338 0 0 3 0x14200 bored systqmp 71015 514270 0 0 3 0x14200 bored systq 10066 180755 0 0 2 0x14200 softclockmp 43159 456289 0 0 7 0x40014200 softclock 2881 457473 0 0 3 0x40014200 idle0 1 247602 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 77448 (syz-executor) thread 0xffff8000ffff31d8 (95946) Process 61401 (syslogd) thread 0xffff8000ffffd6d8 (199494) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10257 10325K 10621K 166960K 16387 0 pcb 17 16K 18K 166960K 867 0 rtable 215 9K 10K 166960K 6058 0 pf 47 20K 28K 166960K 730 0 ifaddr 44 9K 10K 166960K 761 0 ifgroup 66 2K 3K 166960K 846 0 sysctl 4 1K 1K 166960K 12 0 counters 70 37K 37K 166960K 494 0 ioctlops 0 0K 8K 166960K 1990 0 iov 0 0K 28K 166960K 411 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1560 98K 99K 166960K 6334 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 52K 76K 166960K 66 0 VM map 2 1K 1K 166960K 2 0 sem 23 48K 49K 166960K 228 0 dirhash 18 3K 3K 166960K 57 0 ACPI 1690 195K 286K 166960K 12418 0 file desc 17 61K 89K 166960K 5895 0 sigio 0 0K 0K 166960K 100 0 proc 73 103K 152K 166960K 5423 0 subproc 104 6K 7K 166960K 2212 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 441 0 in_multi 92 6K 7K 166960K 1969 0 ether_multi 1 0K 0K 166960K 35 0 mrt 2 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 2993 0 pfkey data 0 0K 0K 166960K 11 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 252 73K 109K 166960K 48067 0 UVM aobj 89 5K 5K 166960K 97 0 pinsyscall 42 84K 105K 166960K 11268 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 227 0 NDP 16 0K 2K 166960K 567 0 temp 80 6824K 7084K 166960K 239199 0 kqueue 14 22K 30K 166960K 579 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 758 0 755 5 4 1 3 0 8 0 rtentry 112 2209 0 2115 7 3 4 4 0 8 0 unpcb 144 3028 0 3006 28 27 1 6 0 8 0 syncache 336 30 0 30 13 13 0 1 0 8 0 tcpqe 32 6 0 6 5 5 0 1 0 8 0 tcpcb 808 1249 0 1241 33 32 1 8 0 8 0 arp 120 438 0 420 1 0 1 1 0 8 0 inpcb 336 5413 0 5398 81 78 3 12 0 8 0 nd6 136 531 0 509 2 1 1 2 0 8 0 pkpcb 40 57 0 57 10 10 0 1 0 8 0 kcovpl 48 170 0 162 1 0 1 1 0 8 0 ppxss 1168 35 0 34 12 11 1 1 0 8 0 pfstscr 40 4 0 4 3 3 0 1 0 8 0 pffrag 232 28 0 23 1 0 1 1 0 482 0 pffrnode 88 27 0 22 1 0 1 1 0 8 0 pffrent 40 117 0 112 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 485 0 423 1 0 1 1 0 8 0 pfstkey 128 500 0 438 3 0 3 3 0 8 0 pfstate 376 491 0 431 11 2 9 9 0 8 0 pfrule 1344 82 0 54 4 1 3 3 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 8220 0 7760 48 18 30 31 0 8 0 art_table 32 8222 0 7760 4 0 4 4 0 8 0 art_node 16 2199 0 2114 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 219 0 198 1 0 1 1 0 8 0 shmpl 112 94 0 8 3 0 3 3 0 8 0 dirhash 1024 48 0 26 3 0 3 3 0 8 0 dino2pl 256 8157 0 6310 116 0 116 116 0 8 0 ffsino 272 8157 0 6310 124 0 124 124 0 8 0 nchpl 144 13500 0 11574 72 0 72 72 0 8 0 uvmvnodes 80 9546 0 0 195 0 195 195 0 8 0 vnodes 216 9546 0 0 531 0 531 531 0 8 0 namei 1024 65505 0 65505 9 8 1 1 0 8 1 percpumem 16 261 0 212 1 0 1 1 0 8 0 kstatmem 264 454 0 424 3 0 3 3 0 8 0 scsiplug 72 7 0 7 4 4 0 1 0 8 0 scxspl 216 123131 0 123131 24 21 3 8 1 8 3 plimitpl 152 1507 0 1490 1 0 1 1 0 8 0 sigapl 424 5924 0 5853 11 2 9 9 0 8 0 futexpl 64 52075 0 52070 18 17 1 1 0 8 0 knotepl 120 1319 0 0 32 0 32 32 0 8 0 kqueuepl 216 1406 0 1394 24 23 1 5 0 8 0 pipepl 320 1192 0 1164 16 13 3 13 0 8 0 fdescpl 496 5883 0 5852 10 5 5 5 0 8 0 filepl 152 35649 0 35385 80 68 12 21 0 8 1 lockfpl 104 1566 0 1558 2 1 1 2 0 8 0 lockfspl 48 558 0 553 1 0 1 1 0 8 0 sessionpl 144 214 0 205 1 0 1 1 0 8 0 pgrppl 48 432 0 415 1 0 1 1 0 8 0 ucredpl 104 5547 0 5532 1 0 1 1 0 8 0 zombiepl 144 6999 0 6998 2 1 1 1 0 8 0 processpl 1160 5924 0 5853 7 1 6 6 0 8 0 procpl 648 11781 0 11701 9 1 8 8 0 8 0 srpgc 96 22 0 22 9 8 1 1 0 8 1 sosppl 168 16 0 16 9 9 0 1 0 8 0 sockpl 664 9311 0 9271 99 94 5 20 0 8 0 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 422 0 0 30 5 25 30 0 8 0 mtagpl 96 24 0 0 1 0 1 1 0 8 0 mbufpl 256 1282 0 0 62 0 62 62 0 8 0 bufpl 280 20498 0 14021 683 146 537 683 0 8 1 anonpl 24 816564 0 812224 242 186 56 82 0 185 5 amapchunkpl 152 154756 0 154188 149 114 35 43 0 158 12 amappl16 200 14176 0 14152 135 121 14 27 0 8 9 amappl15 192 10 0 10 2 2 0 1 0 8 0 amappl14 184 531 0 519 1 0 1 1 0 8 0 amappl13 176 12 0 12 2 2 0 1 0 8 0 amappl12 168 9109 0 9077 4 2 2 3 0 8 0 amappl11 160 63 0 49 1 0 1 1 0 8 0 amappl10 152 13 0 12 2 1 1 1 0 8 0 amappl9 144 181 0 181 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 470 0 458 1 0 1 1 0 8 0 amappl6 120 1768 0 1764 1 0 1 1 0 8 0 amappl5 112 807 0 793 1 0 1 1 0 8 0 amappl4 104 901 0 881 1 0 1 1 0 8 0 amappl3 96 30358 0 30236 5 1 4 4 0 8 0 amappl2 88 3225 0 3155 2 0 2 2 0 8 0 amappl1 80 40917 0 40349 16 2 14 16 0 8 0 amappl 88 46086 0 45897 7 2 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 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 dma512 512 2 0 2 2 2 0 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 96 0 8 2 0 2 2 0 8 0 uaddrrnd 24 5883 0 5852 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5883 0 5852 1 0 1 1 0 8 0 vmmpekpl 168 50738 0 50674 10 6 4 4 0 8 0 vmmpepl 168 366971 0 365083 191 96 95 106 0 357 9 vmsppl 440 5882 0 5852 7 3 4 5 0 8 0 rwobjpl 56 110045 0 99449 162 7 155 157 0 8 0 pdppl 4096 11773 0 11704 353 280 73 85 0 8 4 pvpl 32 45254 0 0 365 0 365 365 0 265 0 pmappl 248 5882 0 5852 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 899 0 451 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8341cff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff83500400) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83500400) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83500400,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x658 sys/kern/sched_bsd.c:460 sleep_finish(0,1) at sleep_finish+0x219 sys/kern/kern_synch.c:416 msleep(ffffffff835eb010,ffffffff834d4310,0,ffffffff830eaa31,0) at msleep+0x13b sys/kern/kern_synch.c:249 softclock_thread(ffff8000fffff1b8) at softclock_thread+0x11f sys/kern/kern_timeout.c:807 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff8341cff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff83500400) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83500400) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83500400,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x658 sys/kern/sched_bsd.c:460 sleep_finish(0,1) at sleep_finish+0x219 sys/kern/kern_synch.c:416 msleep(ffffffff835eb010,ffffffff834d4310,0,ffffffff830eaa31,0) at msleep+0x13b sys/kern/kern_synch.c:249 softclock_thread(ffff8000fffff1b8) at softclock_thread+0x11f sys/kern/kern_timeout.c:807 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at memset+0x49: repe stosb %es:(%rdi) memset() at memset+0x49 ffs_write(ffff8000371b07b0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d6c71e0,ffff8000371b0868,3,fffffd807f7d36e8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000ffff31d8,fffffd807d6c71e0,fffffd807f7d36e8,ffff8000371b0938,ffff8000371b0910) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 sys/kern/kern_ktrace.c:258 dofilewritev(ffff8000ffff31d8,f8,ffff8000371b0ab8,0,ffff8000371b0b70) at dofilewritev+0x4f3 sys/kern/sys_generic.c:401 sys_write(ffff8000ffff31d8,ffff8000371b0c20,ffff8000371b0b70) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000371b0c20) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371b0c20) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f140a2dcd20, count: 6 ddb{1}> trace memset() at memset+0x49 ffs_write(ffff8000371b07b0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d6c71e0,ffff8000371b0868,3,fffffd807f7d36e8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000ffff31d8,fffffd807d6c71e0,fffffd807f7d36e8,ffff8000371b0938,ffff8000371b0910) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline] ktrgenio(ffff8000ffff31d8,f8,1,ffff8000012c8520,4) at ktrgenio+0x2c3 sys/kern/kern_ktrace.c:258 dofilewritev(ffff8000ffff31d8,f8,ffff8000371b0ab8,0,ffff8000371b0b70) at dofilewritev+0x4f3 sys/kern/sys_generic.c:401 sys_write(ffff8000ffff31d8,ffff8000371b0c20,ffff8000371b0b70) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000371b0c20) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371b0c20) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f140a2dcd20, count: -9