uvm_fault(0xffffffff83a99090, 0xffff800011d045cf, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND 439759 33679 0 0 0 0 syz-executor *445307 33679 0 0 0x4000001 1K syz-executor memset() at memset+0x49 ffs_write(ffff80003c3e5910) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8075447370,ffff80003c3e59c0,3,fffffd80097fd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffee548,fffffd8075447370,fffffd80097fd750,ffff80003c3e5a90,ffff80003c3e5a70) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c3e5c10) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c3e5c10) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad8d8976cd0, 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(0xffffffff83a99090, 0xffff800011d045cf, 0, 2) -> d ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80003c3e5910) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8075447370,ffff80003c3e59c0,3,fffffd80097fd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffee548,fffffd8075447370,fffffd80097fd750,ffff80003c3e5a90,ffff80003c3e5a70) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c3e5c10) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c3e5c10) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad8d8976cd0, count: -7 ddb{1}> show registers rdi 0xffff800011d045cf rsi 0 rbp 0xffff80003c3e5830 rbx 0x25cf __ALIGN_SIZE+0x15cf rdx 0x1 rcx 0x1 rax 0 r8 0x230 r9 0xffff80003c3e5790 r10 0x28dc8d3a4b727169 r11 0xffff800011d045cf r12 0x25cf __ALIGN_SIZE+0x15cf r13 0x2800 __ALIGN_SIZE+0x1800 r14 0xfffffd8075447370 r15 0x1 rip 0xffffffff828c9f99 memset+0x49 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80003c3e5628 ss 0x10 memset+0x49: repe stosb %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=445307 pid=33679 tcnt=2 stat=onproc flags process=0 proc=4000001 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffeea78,0xffff8000fffeefb8 process=0xffff80002a37d358 user=0xffff80003c3e0000, vmspace=0xfffffd806c435208 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11035 507713 64777 0 2 0 syz-executor 11035 201832 64777 0 2 0x4000000 syz-executor 33679 439759 44955 0 7 0 syz-executor *33679 445307 44955 0 7 0x4000001 syz-executor 66700 108215 98508 0 2 0x2 syz-executor 60838 112823 20522 0 3 0x80 nanoslp syz-executor 60838 153211 20522 0 3 0x4000080 bell syz-executor 60838 436547 20522 0 3 0x4000080 fsleep syz-executor 41394 50565 615 0 3 0x3000 suspend syz-executor 41394 282436 615 0 2 0x4081000 syz-executor 14992 301560 45762 0 3 0x3000 suspend syz-executor 14992 482867 45762 0 3 0x4081000 inode syz-executor 20522 158378 98508 0 3 0x82 nanoslp syz-executor 1413 282962 0 0 3 0x14200 acct acct 14621 209028 1 0 3 0x100083 ttyopn getty 58147 140145 46648 0 3 0x100082 sbwait ndp 46648 155905 14022 0 3 0x10008a sigsusp sh 26193 87520 98508 0 3 0x82 wait syz-executor 14022 429589 98508 0 3 0x82 wait syz-executor 45762 187477 98508 0 3 0x82 nanoslp syz-executor 64777 218220 98508 0 3 0x82 nanoslp syz-executor 615 89702 98508 0 3 0x82 nanoslp syz-executor 44955 127709 98508 0 3 0x82 nanoslp syz-executor 98508 424408 56873 0 3 0x82 kqread syz-executor 56873 318863 24474 0 3 0x10008a sigsusp ksh 24474 174858 68442 0 3 0x98 kqread sshd-session 68442 440254 71500 0 3 0x92 kqread sshd-session 71500 197429 1 0 3 0x88 kqread sshd 90723 138400 46821 74 3 0x1100092 bpf pflogd 46821 214115 1 0 3 0x80 sbwait pflogd 73621 410815 9684 73 3 0x1100090 kqread syslogd 9684 338755 1 0 3 0x100082 sbwait syslogd 21059 410465 1 0 3 0x100080 kqread resolvd 74409 382103 52656 77 3 0x100092 kqread dhcpleased 92092 138423 52656 77 3 0x100092 kqread dhcpleased 52656 270530 1 0 3 0x80 kqread dhcpleased 23868 312620 0 0 3 0x14200 bored smr 63356 286751 0 0 2 0x14200 zerothread 43037 154770 0 0 3 0x14200 aiodoned aiodoned 99067 473942 0 0 3 0x14200 syncer update 53773 347678 0 0 3 0x14200 cleaner cleaner 34351 305183 0 0 3 0x14200 reaper reaper 22716 25454 0 0 3 0x14200 pgdaemon pagedaemon 98887 253315 0 0 3 0x14200 bored viomb 93500 364457 0 0 3 0x40014200 acpi0 acpi0 55516 54480 0 0 3 0x40014200 idle1 31969 430171 0 0 3 0x14200 bored softnet1 97481 112542 0 0 3 0x14200 bored softnet0 72801 497694 0 0 3 0x14200 smrbar systqmp 73854 226569 0 0 3 0x14200 bored systq 14389 182458 0 0 3 0x14200 tmoslp softclockmp 94619 330653 0 0 3 0x40014200 tmoslp softclock 26521 341504 0 0 3 0x40014200 idle0 1 184267 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 33679 (syz-executor) thread 0xffff8000fffee548 (445307) exclusive rrwlock inode r = 0 (0xfffffd806e546478) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ktrwriteraw+0x175 sys/kern/kern_ktrace.c:689 #7 ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] #7 ktrsysret+0x192 sys/kern/kern_ktrace.c:209 #8 syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #8 syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b2c480) #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+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] #2 syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 #3 Xsyscall+0x128 Process 41394 (syz-executor) thread 0xffff800038bb8fb0 (282436) exclusive rrwlock inode r = 0 (0xfffffd8074903200) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vn_read+0x6c sys/kern/vfs_vnops.c:359 #6 dofilereadv+0x25a sys/kern/sys_generic.c:252 #7 sys_preadv+0xe3 sys/kern/vfs_syscalls.c:3372 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 72801 (systqmp) thread 0xffff8000ffffef90 (497694) shared rwlock systqmp r = 0 (0xffffffff838f9238) #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 12144K 12373K 166960K 12715 0 pcb 17 14K 16K 166960K 122 0 rtable 184 6K 7K 166960K 502 0 pf 30 17K 25K 166960K 210 0 ifaddr 32 5K 7K 166960K 59 0 ifgroup 43 2K 2K 166960K 78 0 sysctl 4 1K 9K 166960K 8 0 counters 64 36K 37K 166960K 96 0 ioctlops 0 0K 8K 166960K 1608 0 iov 0 0K 12K 166960K 14 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1300 82K 82K 166960K 1655 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 85K 166960K 484 0 sigio 0 0K 0K 166960K 3 0 proc 72 115K 180K 166960K 606 0 subproc 70 4K 4K 166960K 88 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 92 0 in_multi 67 5K 7K 166960K 124 0 ether_multi 2 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 427 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 234 161K 171K 166960K 5968 0 UVM aobj 6 2K 2K 166960K 7 0 pinsyscall 44 88K 104K 166960K 1670 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 22 0 NDP 9 0K 2K 166960K 39 0 temp 43 9111K 9182K 166960K 14210 0 kqueue 14 22K 28K 166960K 72 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 64 0 60 1 0 1 1 0 8 0 rtentry 176 167 0 89 5 0 5 5 0 8 0 unpcb 144 130 0 113 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 145 0 141 7 6 1 7 0 8 0 arp 136 34 0 22 1 0 1 1 0 8 0 inpcb 328 426 0 418 8 6 2 7 0 8 0 nd6 152 27 0 12 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 2 1 0 1 1 0 8 0 ppxss 1192 11 0 11 2 1 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 6 0 4 1 0 1 1 0 482 0 pffrnode 88 6 0 4 1 0 1 1 0 8 0 pffrent 40 17 0 15 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 3 0 3 1 0 1 1 0 8 1 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 43 0 1 4 0 4 4 0 8 0 pfstitem 24 54 0 0 1 0 1 1 0 8 0 pfstkey 128 57 0 3 2 0 2 2 0 8 0 pfstate 448 56 0 2 6 0 6 6 0 8 0 pfrule 1360 25 0 19 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 548 0 223 29 1 28 29 0 8 5 art_table 40 549 0 223 5 0 5 5 0 8 0 art_node 32 166 0 92 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 2 1 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 64 17 0 7 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2109 0 643 93 0 93 93 0 8 0 ffsino 296 2109 0 643 114 0 114 114 0 8 0 nchpl 144 2709 0 998 64 0 64 64 0 8 0 rtmask 32 3 0 3 2 1 1 1 0 8 1 vnodes 216 2388 0 0 133 0 133 133 0 8 0 namei 1024 8487 0 8487 3 2 1 2 0 8 1 percpumem 16 63 0 16 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 45 0 24 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 16831 0 16831 5 2 3 3 1 8 3 plimitpl 152 93 0 76 1 0 1 1 0 8 0 sigapl 424 819 0 770 8 0 8 8 0 8 1 knotepl 120 519 0 0 16 0 16 16 0 8 0 kqueuepl 224 122 0 112 1 0 1 1 0 8 0 pipepl 344 176 0 148 3 0 3 3 0 8 0 fdescpl 528 782 0 750 3 0 3 3 0 8 0 filepl 160 3429 0 3211 14 3 11 13 0 8 1 lockfpl 104 94 0 92 1 0 1 1 0 8 0 lockfspl 48 46 0 44 1 0 1 1 0 8 0 sessionpl 144 41 0 32 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 440 0 427 1 0 1 1 0 8 0 zombiepl 144 773 0 770 1 0 1 1 0 8 0 processpl 1232 819 0 770 6 0 6 6 0 8 1 procpl 664 1308 0 1253 8 0 8 8 0 8 1 sockpl 752 631 0 602 12 7 5 11 0 8 1 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 211 0 0 14 0 14 14 0 8 0 bufpl 280 10919 0 4538 456 0 456 456 0 8 0 anonpl 32 8595 0 0 70 0 70 70 0 246 0 amapchunkpl 152 18048 0 17578 28 5 23 26 0 158 3 amappl16 200 2123 0 1860 17 3 14 14 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 444 0 441 1 0 1 1 0 8 0 amappl13 176 128 0 115 1 0 1 1 0 8 0 amappl12 168 1036 0 1004 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 65 0 50 1 0 1 1 0 8 0 amappl9 144 297 0 297 1 1 0 1 0 8 0 amappl8 136 103 0 101 1 0 1 1 0 8 0 amappl7 128 150 0 136 1 0 1 1 0 8 0 amappl6 120 164 0 162 1 0 1 1 0 8 0 amappl5 112 102 0 90 1 0 1 1 0 8 0 amappl4 104 313 0 292 1 0 1 1 0 8 0 amappl3 96 3706 0 3598 4 0 4 4 0 8 0 amappl2 88 548 0 485 2 0 2 2 0 8 0 amappl1 80 11919 0 11289 15 0 15 15 0 8 0 amappl 88 5194 0 5039 5 0 5 5 0 92 1 uvmvnodes 80 105 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 128 253 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 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 782 0 750 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 782 0 750 1 0 1 1 0 8 0 vmmpekpl 168 8218 0 8168 3 0 3 3 0 8 0 vmmpepl 168 57085 0 54902 98 0 98 98 0 357 1 vmsppl 488 781 0 750 5 0 5 5 0 8 0 rwobjpl 80 18285 0 16979 28 0 28 28 0 8 1 pdppl 4096 1571 0 1500 95 22 73 81 0 8 2 pvpl 32 17268 0 0 140 0 140 140 0 265 0 pmappl 256 781 0 750 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 282 0 35 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83998ff0) 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(ffffffff83b2bc80) at __mp_lock+0x190 __mp_lock_spin sys/kern/kern_lock.c:143 [inline] __mp_lock(ffffffff83b2bc80) at __mp_lock+0x190 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: 0x7b8522365990, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83998ff0) 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(ffffffff83b2bc80) at __mp_lock+0x190 __mp_lock_spin sys/kern/kern_lock.c:143 [inline] __mp_lock(ffffffff83b2bc80) at __mp_lock+0x190 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: 0x7b8522365990, count: -7 ddb{0}> machine ddbcpu 1 Stopped at memset+0x49: repe stosb %es:(%rdi) memset() at memset+0x49 ffs_write(ffff80003c3e5910) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8075447370,ffff80003c3e59c0,3,fffffd80097fd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffee548,fffffd8075447370,fffffd80097fd750,ffff80003c3e5a90,ffff80003c3e5a70) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c3e5c10) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c3e5c10) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad8d8976cd0, count: 8 ddb{1}> trace memset() at memset+0x49 ffs_write(ffff80003c3e5910) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8075447370,ffff80003c3e59c0,3,fffffd80097fd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000fffee548,fffffd8075447370,fffffd80097fd750,ffff80003c3e5a90,ffff80003c3e5a70) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffee548,36,0,ffff80003c3e5b60) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80003c3e5c10) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c3e5c10) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad8d8976cd0, count: -7