7Î7Îuvm_fault(0xffffffff8354a888, 0xffff80001825441d, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *264584 5610 0 0x2 0x1 1K syz-executor 501338 36791 0 0x14000 0x40000200 0 softclock memset() at memset+0x49 ffs_write(ffff80002a560bc0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d5b2d00,ffff80002a560c78,3,fffffd807f7d32d8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a0416e8,fffffd807d5b2d00,fffffd807f7d32d8,ffff80002a560d40,ffff80002a560d20) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrsyscall(ffff80002a0416e8,b,20,ffff80002a560ed0) at ktrsyscall+0x31d sys/kern/kern_ktrace.c:182 syscall(ffff80002a560ed0) at syscall+0x2eb mi_syscall sys/sys/syscall_mi.h:157 [inline] syscall(ffff80002a560ed0) at syscall+0x2eb sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7425266129c0, count: 8 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(0xffffffff8354a888, 0xffff80001825441d, 0, 2) -> d ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80002a560bc0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d5b2d00,ffff80002a560c78,3,fffffd807f7d32d8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a0416e8,fffffd807d5b2d00,fffffd807f7d32d8,ffff80002a560d40,ffff80002a560d20) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrsyscall(ffff80002a0416e8,b,20,ffff80002a560ed0) at ktrsyscall+0x31d sys/kern/kern_ktrace.c:182 syscall(ffff80002a560ed0) at syscall+0x2eb mi_syscall sys/sys/syscall_mi.h:157 [inline] syscall(ffff80002a560ed0) at syscall+0x2eb sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7425266129c0, count: -7 ddb{1}> show registers rdi 0xffff80001825441d rsi 0 rbp 0xffff80002a560ae0 rbx 0x641d __ALIGN_SIZE+0x541d rdx 0x3 rcx 0x3 rax 0 r8 0x3e0 r9 0xffff80002a560a40 r10 0xdc5deabdc6bf5d24 r11 0xffff80001825441d r12 0x2800 __ALIGN_SIZE+0x1800 r13 0x241d __ALIGN_SIZE+0x141d r14 0xfffffd807d5b2d00 r15 0x1 rip 0xffffffff81f976f9 memset+0x49 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002a5608d8 ss 0x10 memset+0x49: repe stosb %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=264584 pid=5610 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002db99990,0xffff80002a136a60 process=0xffff800029fe9228 user=0xffff80002a55b000, vmspace=0xfffffd80092fe528 estcpu=33, cpticks=2, pctcpu=0.1, user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88141 282322 99924 0 2 0 syz-executor 88141 482578 99924 0 2 0x4000000 syz-executor 5088 459324 51312 0 2 0 syz-executor 5088 224100 51312 0 3 0x4000080 fsleep syz-executor 22808 468572 52311 0 2 0 syz-executor 22808 164508 52311 0 3 0x4000080 fsleep syz-executor 65687 113404 40850 60929 2 0x10 syz-executor 65687 287691 40850 60929 3 0x4000090 fsleep syz-executor 6492 355304 81309 0 2 0 syz-executor 6492 293628 81309 0 3 0x4000080 fsleep syz-executor 9432 399164 5610 0 2 0 syz-executor 9432 437823 5610 0 3 0x4000080 fsleep syz-executor * 5610 264584 12582 0 7 0x3 syz-executor 52311 354980 12582 0 2 0x482 syz-executor 40850 282657 12582 0 2 0x482 syz-executor 47349 35887 12582 0 2 0x2 syz-executor 99924 292896 12582 0 2 0x482 syz-executor 81309 88072 12582 0 2 0x482 syz-executor 62214 335830 12582 0 2 0x482 syz-executor 51312 386494 12582 0 2 0x482 syz-executor 37234 482637 0 0 3 0x14280 nfsidl nfsio 16117 265339 0 0 3 0x14280 nfsidl nfsio 28764 227936 0 0 3 0x14280 nfsidl nfsio 96225 448320 0 0 3 0x14280 nfsidl nfsio 71665 366275 0 0 3 0x14280 nfsidl nfsio 49102 408207 0 0 3 0x14280 nfsidl nfsio 52532 327653 0 0 3 0x14280 nfsidl nfsio 6694 11296 0 0 3 0x14280 nfsidl nfsio 48051 84258 0 0 3 0x14280 nfsidl nfsio 94729 16989 0 0 3 0x14280 nfsidl nfsio 92396 89973 0 0 3 0x14280 nfsidl nfsio 96227 376483 0 0 3 0x14280 nfsidl nfsio 89585 458370 0 0 3 0x14280 nfsidl nfsio 48965 262086 0 0 3 0x14280 nfsidl nfsio 54801 449636 0 0 3 0x14280 nfsidl nfsio 15030 29367 0 0 3 0x14280 nfsidl nfsio 34748 28864 0 0 3 0x14280 nfsidl nfsio 76059 179490 0 0 3 0x14280 nfsidl nfsio 62964 62645 0 0 3 0x14280 nfsidl nfsio 50060 483472 0 0 3 0x14280 nfsidl nfsio 66490 502242 1 0 3 0x82 nanoslp getty 43789 272490 0 0 3 0x14200 bored sosplice 12582 143440 27908 0 3 0x82 kqread syz-executor 27908 440322 92277 0 3 0x10008a sigsusp ksh 92277 118878 5996 0 3 0x98 kqread sshd-session 5996 57679 85991 0 3 0x92 kqread sshd-session 85991 391502 1 0 3 0x88 kqread sshd 47874 198299 69030 74 3 0x1100092 bpf pflogd 69030 356281 1 0 3 0x80 sbwait pflogd 43961 405239 97358 73 2 0x1100010 syslogd 97358 211336 1 0 3 0x100082 sbwait syslogd 99776 500365 1 0 3 0x100080 kqread resolvd 78558 473982 80688 77 3 0x100092 kqread dhcpleased 88912 449508 80688 77 3 0x100092 kqread dhcpleased 80688 177425 1 0 3 0x80 kqread dhcpleased 64758 14442 0 0 3 0x14200 bored smr 10462 140102 0 0 2 0x14200 zerothread 20180 197915 0 0 3 0x14200 aiodoned aiodoned 69994 57634 0 0 3 0x14200 syncer update 15851 267567 0 0 3 0x14200 cleaner cleaner 85946 150839 0 0 3 0x14200 reaper reaper 19144 366574 0 0 3 0x14200 pgdaemon pagedaemon 34643 350850 0 0 3 0x14200 bored viomb 55325 16342 0 0 3 0x40014200 acpi0 acpi0 46794 326287 0 0 3 0x40014200 idle1 1522 74159 0 0 3 0x14200 bored softnet3 86683 264095 0 0 3 0x14200 bored softnet2 97888 140156 0 0 3 0x14200 bored softnet1 11028 321163 0 0 3 0x14200 bored softnet0 95733 186273 0 0 3 0x14200 bored systqmp 17883 507689 0 0 3 0x14200 bored systq 13698 467931 0 0 3 0x14200 tmoslp softclockmp 36791 501338 0 0 7 0x40014200 softclock 65812 223094 0 0 3 0x40014200 idle0 1 453624 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 5610 (syz-executor) thread 0xffff80002a0416e8 (264584) exclusive rrwlock inode r = 0 (0xfffffd806606c2c8) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ktrwriteraw+0x172 sys/kern/kern_ktrace.c:679 #7 ktrsyscall+0x31d sys/kern/kern_ktrace.c:182 #8 syscall+0x2eb mi_syscall sys/sys/syscall_mi.h:157 [inline] #8 syscall+0x2eb sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83561d10) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 syscall+0x2cc mi_syscall sys/sys/syscall_mi.h:156 [inline] #1 syscall+0x2cc sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 10120K 10556K 166960K 12420 0 pcb 20 14K 16K 166960K 235 0 rtable 226 7K 7K 166960K 2302 0 pf 36 18K 25K 166960K 199 0 ifaddr 41 7K 8K 166960K 302 0 ifgroup 55 2K 2K 166960K 326 0 sysctl 3 0K 0K 166960K 3 0 counters 64 36K 36K 166960K 204 0 ioctlops 0 0K 4K 166960K 1636 0 iov 0 0K 28K 166960K 47 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1360 86K 86K 166960K 2867 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 30 0 dirhash 15 2K 3K 166960K 18 0 ACPI 1690 195K 286K 166960K 12418 0 file desc 17 61K 89K 166960K 2324 0 sigio 0 0K 0K 166960K 21 0 proc 75 103K 128K 166960K 2255 0 subproc 104 6K 6K 166960K 873 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 247 0 in_multi 94 6K 7K 166960K 808 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 1241 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 230 72K 91K 166960K 19016 0 UVM aobj 14 2K 4K 166960K 19 0 pinsyscall 42 84K 104K 166960K 4950 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 40 0 NDP 12 0K 2K 166960K 218 0 temp 53 6818K 6898K 166960K 119165 0 kqueue 13 20K 30K 166960K 243 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 120 235 0 232 1 0 1 1 0 8 0 rtentry 112 811 0 708 5 1 4 4 0 8 0 unpcb 144 1017 0 996 11 9 2 6 0 8 0 syncache 336 7 0 7 4 4 0 1 0 8 0 tcpcb 808 707 0 703 14 7 7 7 0 8 6 arp 120 139 0 121 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 336 2090 0 2078 21 14 7 10 0 8 6 nd6 136 209 0 186 1 0 1 1 0 8 0 kcovpl 48 67 0 59 1 0 1 1 0 8 0 ppxss 1168 6 0 6 3 3 0 1 0 8 0 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 51 0 48 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 0 5 5 0 8 5 pfosfpen 112 1428 0 1428 21 0 21 21 0 8 21 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 160 0 104 1 0 1 1 0 8 0 pfstkey 128 165 0 107 3 0 3 3 0 8 0 pfstate 376 161 0 106 9 2 7 7 0 8 0 pfrule 1344 47 0 39 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3117 0 2679 33 3 30 30 0 8 1 art_table 32 3118 0 2679 4 0 4 4 0 8 0 art_node 16 776 0 682 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 2 1 1 1 0 8 0 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 16 0 5 1 0 1 1 0 8 0 dirhash 1024 21 0 2 3 0 3 3 0 8 0 dino2pl 256 3845 0 2218 102 0 102 102 0 8 0 ffsino 272 3845 0 2218 109 0 109 109 0 8 0 nchpl 144 5912 0 5239 65 39 26 63 0 8 0 uvmvnodes 80 5128 0 0 105 0 105 105 0 8 0 vnodes 216 5128 0 0 285 0 285 285 0 8 0 namei 1024 23453 0 23453 5 4 1 1 0 8 1 percpumem 16 116 0 70 1 0 1 1 0 8 0 kstatmem 264 164 0 140 2 0 2 2 0 8 0 scsiplug 72 5 0 5 3 2 1 1 0 8 1 scxspl 216 48805 0 48805 14 12 2 8 1 8 2 plimitpl 152 395 0 377 1 0 1 1 0 8 0 sigapl 424 2530 0 2459 11 2 9 9 0 8 0 futexpl 64 19197 0 19192 8 7 1 1 0 8 0 knotepl 120 646 0 0 17 0 17 17 0 8 0 kqueuepl 216 381 0 372 3 2 1 3 0 8 0 pipepl 320 407 0 380 3 0 3 3 0 8 0 fdescpl 496 2491 0 2460 10 5 5 5 0 8 0 filepl 152 11780 0 11517 33 20 13 17 0 8 2 lockfpl 104 500 0 497 1 0 1 1 0 8 0 lockfspl 48 211 0 208 1 0 1 1 0 8 0 sessionpl 144 85 0 77 1 0 1 1 0 8 0 pgrppl 48 215 0 199 1 0 1 1 0 8 0 ucredpl 104 1518 0 1504 1 0 1 1 0 8 0 zombiepl 144 2461 0 2459 1 0 1 1 0 8 0 processpl 1160 2530 0 2459 7 1 6 6 0 8 0 procpl 648 4293 0 4216 9 1 8 8 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sosppl 168 5 0 5 4 4 0 1 0 8 0 sockpl 664 3352 0 3316 35 25 10 14 0 8 6 mcl64k 65536 19 0 0 3 1 2 3 0 8 0 mcl16k 16384 20 0 0 3 1 2 3 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 15 0 0 2 0 2 2 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 254 0 0 31 0 31 31 0 8 0 mtagpl 96 11 0 0 1 0 1 1 0 8 0 mbufpl 256 557 0 0 28 0 28 28 0 8 0 bufpl 280 11492 0 5343 442 1 441 442 0 8 0 anonpl 24 410605 0 407005 101 38 63 79 0 185 26 amapchunkpl 152 63063 0 62581 52 20 32 41 0 158 12 amappl16 200 7379 0 7350 50 43 7 28 0 8 4 amappl15 192 31 0 31 2 2 0 1 0 8 0 amappl14 184 258 0 246 1 0 1 1 0 8 0 amappl13 176 22 0 22 1 1 0 1 0 8 0 amappl12 168 4074 0 4043 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 15 0 15 1 1 0 1 0 8 0 amappl9 144 132 0 132 1 1 0 1 0 8 0 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 241 0 228 1 0 1 1 0 8 0 amappl6 120 753 0 751 1 0 1 1 0 8 0 amappl5 112 375 0 364 1 0 1 1 0 8 0 amappl4 104 505 0 487 1 0 1 1 0 8 0 amappl3 96 12202 0 12091 4 0 4 4 0 8 0 amappl2 88 1535 0 1467 2 0 2 2 0 8 0 amappl1 80 18429 0 17861 16 2 14 14 0 8 0 amappl 88 18053 0 17884 6 1 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 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 18 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2491 0 2460 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2491 0 2460 1 0 1 1 0 8 0 vmmpekpl 168 19997 0 19934 4 0 4 4 0 8 0 vmmpepl 168 155301 0 153454 121 25 96 103 0 357 12 vmsppl 440 2490 0 2460 5 1 4 5 0 8 0 rwobjpl 56 48681 0 42615 91 4 87 87 0 8 0 pdppl 4096 4989 0 4920 180 109 71 83 0 8 2 pvpl 32 47166 0 0 380 0 380 380 0 265 0 pmappl 248 2490 0 2460 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 549 0 149 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83454ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 __mp_lock(ffffffff83561b08) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83561b08) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83561b08,1) 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(ffffffff8356aff0,ffffffff834aa120,0,ffffffff830e677e,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: 5 ddb{0}> trace x86_ipi_db(ffffffff83454ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 __mp_lock(ffffffff83561b08) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83561b08) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83561b08,1) 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(ffffffff8356aff0,ffffffff834aa120,0,ffffffff830e677e,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: -10 ddb{0}> machine ddbcpu 1 Stopped at memset+0x49: repe stosb %es:(%rdi) memset() at memset+0x49 ffs_write(ffff80002a560bc0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d5b2d00,ffff80002a560c78,3,fffffd807f7d32d8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a0416e8,fffffd807d5b2d00,fffffd807f7d32d8,ffff80002a560d40,ffff80002a560d20) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrsyscall(ffff80002a0416e8,b,20,ffff80002a560ed0) at ktrsyscall+0x31d sys/kern/kern_ktrace.c:182 syscall(ffff80002a560ed0) at syscall+0x2eb mi_syscall sys/sys/syscall_mi.h:157 [inline] syscall(ffff80002a560ed0) at syscall+0x2eb sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7425266129c0, count: 8 ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80002a560bc0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807d5b2d00,ffff80002a560c78,3,fffffd807f7d32d8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a0416e8,fffffd807d5b2d00,fffffd807f7d32d8,ffff80002a560d40,ffff80002a560d20) at ktrwriteraw+0x1bc sys/kern/kern_ktrace.c:682 ktrsyscall(ffff80002a0416e8,b,20,ffff80002a560ed0) at ktrsyscall+0x31d sys/kern/kern_ktrace.c:182 syscall(ffff80002a560ed0) at syscall+0x2eb mi_syscall sys/sys/syscall_mi.h:157 [inline] syscall(ffff80002a560ed0) at syscall+0x2eb sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7425266129c0, count: -7