uvm_fault(0xffffffff838fce98, 0xffff800028aa5f2b, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *207044 22783 0 0 0x1 1K syz-executor 332752 11468 0 0x2 0x1 0 syz-executor memset() at memset+0x49 ffs_write(ffff80003c4b9000) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807aecd7e0,ffff80003c4b90b0,3,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800036bf3248,fffffd807aecd7e0,fffffd80097fb6e8,ffff80003c4b9180,ffff80003c4b9160) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c4b9300) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c4b9300) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ded579030b0, 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(0xffffffff838fce98, 0xffff800028aa5f2b, 0, 2) -> d ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80003c4b9000) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807aecd7e0,ffff80003c4b90b0,3,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800036bf3248,fffffd807aecd7e0,fffffd80097fb6e8,ffff80003c4b9180,ffff80003c4b9160) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c4b9300) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c4b9300) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ded579030b0, count: -7 ddb{1}> show registers rdi 0xffff800028aa5f2b rsi 0 rbp 0xffff80003c4b8f20 rbx 0x3ff2b acpi_pdirpa+0x2bd9c rdx 0x5 rcx 0x5 rax 0 r8 0xd0 r9 0xffff80003c4b8e80 r10 0x6f388013854b24de r11 0xffff800028aa5f2b r12 0x3f2b __ALIGN_SIZE+0x2f2b r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xfffffd807aecd7e0 r15 0x1 rip 0xffffffff814817a9 memset+0x49 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80003c4b8d18 ss 0 memset+0x49: repe stosb %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=207044 pid=22783 tcnt=3 stat=onproc flags process=0 proc=1 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800036bf2d18,0xffff800036bf34f0 process=0xffff800036bf7510 user=0xffff80003c4b4000, vmspace=0xfffffd8070f33d70 estcpu=36, cpticks=5, pctcpu=0.0, user=2, sys=2, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 34469 489511 28604 0 2 0 syz-executor 23453 305358 35384 0 2 0 syz-executor 23453 136222 35384 0 2 0x4000000 syz-executor 7926 155607 5605 0 2 0 syz-executor 7926 445945 5605 0 2 0x4000000 syz-executor 29291 447520 0 0 3 0x14200 acct acct *22783 207044 70318 0 7 0x1 syz-executor 22783 505365 70318 0 3 0x4000080 lockf syz-executor 22783 302747 70318 0 3 0x4000080 fsleep syz-executor 58997 142609 73525 0 3 0x80 nanoslp syz-executor 58997 464903 73525 0 3 0x4000080 pipewr syz-executor 58997 76624 73525 0 3 0x4000080 fsleep syz-executor 6304 239730 70735 0 2 0x2 syz-executor 35384 519536 70735 0 2 0xc82 syz-executor 68052 363930 1 0 3 0x100083 ttyopn getty 73525 368868 70735 0 3 0x82 nanoslp syz-executor 40891 152502 0 0 3 0x14200 bored sosplice 64001 161846 70735 0 3 0x82 wait syz-executor 70318 267887 70735 0 2 0xc82 syz-executor 28604 322173 70735 0 3 0x82 nanoslp syz-executor 5605 13129 70735 0 3 0x82 nanoslp syz-executor 11468 332752 70735 0 7 0x3 syz-executor 70735 235838 71584 0 2 0x2 syz-executor 71584 224926 13424 0 3 0x10008a sigsusp ksh 13424 369382 87450 0 3 0x98 kqread sshd-session 87450 503587 11634 0 3 0x92 kqread sshd-session 11634 444015 1 0 3 0x88 kqread sshd 40160 59492 95921 74 3 0x1100092 bpf pflogd 95921 42632 1 0 3 0x80 sbwait pflogd 77480 217678 98851 73 3 0x1100090 kqread syslogd 98851 50967 1 0 3 0x100082 sbwait syslogd 70268 509443 1 0 3 0x100080 kqread resolvd 4757 286478 90839 77 3 0x100092 kqread dhcpleased 71344 418059 90839 77 3 0x100092 kqread dhcpleased 90839 260646 1 0 3 0x80 kqread dhcpleased 18199 410253 0 0 3 0x14200 bored smr 81285 198609 0 0 2 0x14200 zerothread 36775 456931 0 0 3 0x14200 aiodoned aiodoned 95124 39784 0 0 3 0x14200 syncer update 49848 381114 0 0 3 0x14200 cleaner cleaner 1962 513709 0 0 3 0x14200 reaper reaper 65991 219191 0 0 3 0x14200 pgdaemon pagedaemon 29649 177097 0 0 3 0x14200 bored viomb 83091 424139 0 0 3 0x40014200 acpi0 acpi0 98818 395595 0 0 3 0x40014200 idle1 18604 39160 0 0 3 0x14200 bored softnet1 75982 260621 0 0 3 0x14200 bored softnet0 24495 298158 0 0 3 0x14200 bored systqmp 88357 249725 0 0 3 0x14200 bored systq 98194 266709 0 0 3 0x14200 tmoslp softclockmp 23543 130862 0 0 3 0x40014200 tmoslp softclock 23819 209534 0 0 3 0x40014200 idle0 1 523098 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 22783 (syz-executor) thread 0xffff800036bf3248 (207044) exclusive rrwlock inode r = 0 (0xfffffd806e111598) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:693 #6 ktrwriteraw+0x175 sys/kern/kern_ktrace.c:688 #7 ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] #7 ktrsysret+0x192 sys/kern/kern_ktrace.c:209 #8 syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #8 syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838f9630) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] #1 ktrsysret+0xde sys/kern/kern_ktrace.c:209 #2 syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #2 syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 #3 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 11101K 12037K 166960K 12995 0 pcb 19 14K 16K 166960K 240 0 rtable 216 9K 9K 166960K 445 0 pf 38 18K 22K 166960K 607 0 ifaddr 43 7K 8K 166960K 106 0 ifgroup 55 2K 2K 166960K 161 0 sysctl 3 1K 9K 166960K 13 0 counters 68 36K 37K 166960K 182 0 ioctlops 0 0K 4K 166960K 1785 0 iov 0 0K 16K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1486 93K 94K 166960K 2402 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 18 3K 3K 166960K 28 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 1169 0 sigio 0 0K 0K 166960K 30 0 proc 72 115K 180K 166960K 718 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 380 0 in_multi 98 7K 7K 166960K 183 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 592 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 167K 182K 166960K 12405 0 UVM aobj 57 3K 3K 166960K 59 0 pinsyscall 42 84K 100K 166960K 2334 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 54 0 NDP 12 0K 2K 166960K 74 0 temp 77 8652K 8896K 166960K 44389 0 kqueue 14 20K 33K 166960K 247 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 120 240 0 237 3 2 1 3 0 8 0 rtentry 176 157 0 66 5 0 5 5 0 8 0 unpcb 144 670 0 650 5 3 2 4 0 8 1 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 424 0 419 9 7 2 7 0 8 1 arp 136 21 0 6 1 0 1 1 0 8 0 inpcb 328 1258 0 1248 10 3 7 7 0 8 5 nd6 144 27 0 9 1 0 1 1 0 8 0 pkpcb 40 6 0 5 2 1 1 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 46 0 46 1 0 1 1 0 8 1 pppxif 1504 3 0 3 3 2 1 1 0 8 1 pfstscr 40 3 0 3 1 1 0 1 0 8 0 pffrag 232 30 0 22 1 0 1 1 0 482 0 pffrnode 88 27 0 21 1 0 1 1 0 8 0 pffrent 40 59 0 51 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 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pfstitem 24 90 0 19 1 0 1 1 0 8 0 pfstkey 128 96 0 25 3 0 3 3 0 8 0 pfstate 384 93 0 23 7 0 7 7 0 8 0 pfrule 1344 90 0 84 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 719 0 301 32 4 28 30 0 8 1 art_table 40 721 0 301 5 0 5 5 0 8 0 art_node 32 157 0 82 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semapl 112 23 0 7 1 0 1 1 0 8 0 shmpl 112 56 0 2 2 0 2 2 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 3473 0 1964 96 0 96 96 0 8 0 ffsino 296 3473 0 1964 118 0 118 118 0 8 0 nchpl 144 5059 0 3358 64 0 64 64 0 8 0 rtmask 32 8 0 8 2 1 1 1 0 8 1 uvmvnodes 80 4207 0 0 86 0 86 86 0 8 0 vnodes 216 4207 0 0 234 0 234 234 0 8 0 namei 1024 18594 0 18594 2 1 1 2 0 8 1 percpumem 16 106 0 57 1 0 1 1 0 8 0 kstatmem 264 104 0 78 3 1 2 3 0 8 0 scsiplug 72 7 0 7 2 2 0 1 0 8 0 scxspl 216 31340 0 31340 9 8 1 8 1 8 1 plimitpl 152 324 0 306 1 0 1 1 0 8 0 sigapl 424 1451 0 1402 6 0 6 6 0 8 0 knotepl 120 745 0 0 23 0 23 23 0 8 0 kqueuepl 224 443 0 433 5 3 2 3 0 8 1 pipepl 344 424 0 396 12 6 6 9 0 8 3 fdescpl 528 1430 0 1399 3 0 3 3 0 8 0 filepl 160 10165 0 9933 21 8 13 21 0 8 2 lockfpl 104 669 0 665 2 0 2 2 0 8 1 lockfspl 48 278 0 275 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 85 0 68 1 0 1 1 0 8 0 ucredpl 104 1467 0 1453 1 0 1 1 0 8 0 zombiepl 144 1404 0 1402 1 0 1 1 0 8 0 processpl 1232 1451 0 1402 6 2 4 5 0 8 0 procpl 664 3174 0 3119 6 0 6 6 0 8 0 sosppl 168 5 0 5 3 2 1 1 0 8 1 sockpl 752 2216 0 2182 13 3 10 11 0 8 5 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 188 0 0 12 0 12 12 0 8 0 bufpl 280 12586 0 6443 439 0 439 439 0 8 0 anonpl 32 12036 0 0 98 0 98 98 0 246 0 amapchunkpl 152 41575 0 41044 38 6 32 32 0 158 3 amappl16 200 5228 0 5141 42 25 17 29 0 8 1 amappl15 192 41 0 41 1 1 0 1 0 8 0 amappl14 184 124 0 112 1 0 1 1 0 8 0 amappl13 176 9 0 9 2 2 0 1 0 8 0 amappl12 168 2125 0 2095 4 2 2 3 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 24 0 24 2 2 0 1 0 8 0 amappl9 144 251 0 250 2 1 1 1 0 8 0 amappl8 136 48 0 45 1 0 1 1 0 8 0 amappl7 128 115 0 102 1 0 1 1 0 8 0 amappl6 120 213 0 210 1 0 1 1 0 8 0 amappl5 112 137 0 127 1 0 1 1 0 8 0 amappl4 104 321 0 300 1 0 1 1 0 8 0 amappl3 96 7035 0 6945 3 0 3 3 0 8 0 amappl2 88 1694 0 1616 2 0 2 2 0 8 0 amappl1 80 13192 0 12602 16 2 14 15 0 8 0 amappl 88 11477 0 11315 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 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 39 0 39 2 2 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 58 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1430 0 1399 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1430 0 1399 1 0 1 1 0 8 0 vmmpekpl 168 13806 0 13757 3 0 3 3 0 8 0 vmmpepl 168 95270 0 93246 111 8 103 111 0 357 1 vmsppl 488 1429 0 1399 5 0 5 5 0 8 1 rwobjpl 80 31467 0 26227 111 0 111 111 0 8 0 pdppl 4096 2868 0 2798 110 38 72 82 0 8 2 pvpl 32 19207 0 0 156 1 155 155 0 265 0 pmappl 256 1429 0 1399 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 299 0 57 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83799ff0) 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(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff8000ffffd760,5b,0,ffff80002a2fcb40) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffffd760,5b,0,ffff80002a2fcb40) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2fcbf0) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2fcbf0) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ed8dfb59c0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83799ff0) 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(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff8000ffffd760,5b,0,ffff80002a2fcb40) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffffd760,5b,0,ffff80002a2fcb40) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2fcbf0) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2fcbf0) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ed8dfb59c0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at memset+0x49: repe stosb %es:(%rdi) memset() at memset+0x49 ffs_write(ffff80003c4b9000) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807aecd7e0,ffff80003c4b90b0,3,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800036bf3248,fffffd807aecd7e0,fffffd80097fb6e8,ffff80003c4b9180,ffff80003c4b9160) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c4b9300) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c4b9300) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ded579030b0, count: 8 ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80003c4b9000) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd807aecd7e0,ffff80003c4b90b0,3,fffffd80097fb6e8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800036bf3248,fffffd807aecd7e0,fffffd80097fb6e8,ffff80003c4b9180,ffff80003c4b9160) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691 ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff800036bf3248,5b,0,ffff80003c4b9250) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c4b9300) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c4b9300) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ded579030b0, count: -7