uvm_fault(0xffffffff828ab618, 0xffff8000191ef555, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x45: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *485871 16956 73 0x100010 0 0 syslogd memset() at memset+0x45 ffs_write(ffff80002169d270) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd806e48fbb0,ffff80002169d490,3,fffffd807f7d8a80) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80704bf3c8,ffff80002169d490,0) at vn_write+0x14c sys/kern/vfs_vnops.c:414 dofilewritev(ffff800021648550,e,ffff80002169d490,0,ffff80002169d590) at dofilewritev+0x1a3 sys/kern/sys_generic.c:380 sys_writev(ffff800021648550,ffff80002169d530,ffff80002169d590) at sys_writev+0xa7 sys/kern/sys_generic.c:327 syscall(ffff80002169d600) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbc2a0, count: 7 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff828ab618, 0xffff8000191ef555, 0, 2) -> d ddb> trace memset() at memset+0x45 ffs_write(ffff80002169d270) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd806e48fbb0,ffff80002169d490,3,fffffd807f7d8a80) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80704bf3c8,ffff80002169d490,0) at vn_write+0x14c sys/kern/vfs_vnops.c:414 dofilewritev(ffff800021648550,e,ffff80002169d490,0,ffff80002169d590) at dofilewritev+0x1a3 sys/kern/sys_generic.c:380 sys_writev(ffff800021648550,ffff80002169d530,ffff80002169d590) at sys_writev+0xa7 sys/kern/sys_generic.c:327 syscall(ffff80002169d600) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbc2a0, count: -8 ddb> show registers rdi 0xffff8000191ef555 rsi 0 rbp 0xffff80002169d190 rbx 0x1 rdx 0x3 rcx 0x3 rax 0 r8 0x3aa8 __ALIGN_SIZE+0x2aa8 r9 0xffff80002169d0e8 r10 0x4d00fd1e6c8a4f19 r11 0xffff8000191ef555 r12 0xc4555 acpi_pdirpa+0xb03bd r13 0xfffffd806e9465a0 r14 0x4000 __ALIGN_SIZE+0x3000 r15 0xfffffd806e9465a0 rip 0xffffffff81fdaa75 memset+0x45 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002169cf98 ss 0x10 memset+0x45: repe stosb %es:(%rdi) ddb> show proc PROC (syslogd) pid=485871 stat=onproc flags process=100010 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800021648010,0xffff800021648800 process=0xffff8000216407e0 user=0xffff800021698000, vmspace=0xfffffd806e44bdd8 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 91586 395596 13627 0 2 0 syz-executor.0 91586 72989 13627 0 2 0x4000000 syz-executor.0 67207 519556 46884 0 2 0x2 syz-executor.1 13627 293932 46884 0 3 0x82 nanoslp syz-executor.0 43186 447651 1 0 3 0x100083 ttyin getty 64092 397697 0 0 3 0x14280 nfsidl nfsio 94388 383862 0 0 3 0x14280 nfsidl nfsio 75546 449794 0 0 3 0x14280 nfsidl nfsio 24932 50161 0 0 3 0x14280 nfsidl nfsio 39893 484851 0 0 3 0x14280 nfsidl nfsio 63640 8852 0 0 3 0x14280 nfsidl nfsio 35909 451000 0 0 3 0x14280 nfsidl nfsio 51236 122095 0 0 3 0x14280 nfsidl nfsio 90847 279111 0 0 3 0x14280 nfsidl nfsio 19226 170037 0 0 3 0x14280 nfsidl nfsio 11173 477614 0 0 3 0x14280 nfsidl nfsio 73848 100587 0 0 3 0x14280 nfsidl nfsio 5336 518544 0 0 3 0x14280 nfsidl nfsio 2048 316655 0 0 3 0x14280 nfsidl nfsio 47407 363577 0 0 3 0x14280 nfsidl nfsio 23191 36878 0 0 3 0x14280 nfsidl nfsio 91990 367410 0 0 3 0x14280 nfsidl nfsio 30177 323248 0 0 3 0x14280 nfsidl nfsio 89696 43797 0 0 3 0x14280 nfsidl nfsio 57171 360380 0 0 3 0x14280 nfsidl nfsio 41932 220098 0 0 3 0x14200 bored sosplice 46884 379410 81952 0 3 0x82 kqread syz-fuzzer 46884 40734 81952 0 3 0x4000082 thrsleep syz-fuzzer 46884 124635 81952 0 3 0x4000082 thrsleep syz-fuzzer 46884 475150 81952 0 3 0x4000082 thrsleep syz-fuzzer 46884 21645 81952 0 3 0x4000082 thrsleep syz-fuzzer 46884 206095 81952 0 3 0x4000082 thrsleep syz-fuzzer 46884 298447 81952 0 3 0x4000082 thrsleep syz-fuzzer 81952 393978 1928 0 3 0x10008a sigsusp ksh 1928 501355 73822 0 3 0x9a kqread sshd 73822 217709 1 0 3 0x88 kqread sshd *16956 485871 26804 73 7 0x100010 syslogd 26804 309945 1 0 3 0x100082 netio syslogd 489 341728 1 0 3 0x100080 kqread resolvd 2924 120566 87015 77 3 0x100092 kqread dhcpleased 20542 293418 87015 77 3 0x100092 kqread dhcpleased 87015 413255 1 0 3 0x80 kqread dhcpleased 41474 18492 0 0 3 0x14200 bored smr 2661 284725 0 0 2 0x14200 zerothread 20696 96194 0 0 3 0x14200 aiodoned aiodoned 47333 7495 0 0 3 0x14200 syncer update 85671 234915 0 0 3 0x14200 cleaner cleaner 68285 470248 0 0 3 0x14200 reaper reaper 65292 421476 0 0 3 0x14200 pgdaemon pagedaemon 78014 155707 0 0 3 0x14200 bored viomb 76864 177472 0 0 3 0x40014200 acpi0 acpi0 15351 498326 0 0 3 0x14200 bored softnet 17810 110646 0 0 3 0x14200 bored systqmp 27275 93761 0 0 3 0x14200 bored systq 55908 187801 0 0 3 0x40014200 bored softclock 68865 293039 0 0 3 0x40014200 idle0 1 177323 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10131 6365K 7546K 78643K 41448 0 pcb 13 20K 25K 78643K 4039 0 rtable 153 24K 27K 78643K 7725 0 ifaddr 79 27K 31K 78643K 2461 0 sysctl 3 1K 1K 78643K 5 0 counters 21 16K 17K 78643K 271 0 ioctlops 0 0K 4K 78643K 5033 0 iov 0 0K 32K 78643K 2110 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1390 87K 88K 78643K 18659 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 166 0 VM map 2 0K 0K 78643K 2 0 sem 12 1K 1K 78643K 17 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 18337 0 sigio 0 0K 0K 78643K 770 0 proc 74 56K 71K 78643K 2494 0 subproc 26 1K 1K 78643K 869 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1282 0 in_multi 36 2K 2K 78643K 2033 0 ether_multi 1 0K 0K 78643K 441 0 mrt 1 0K 0K 78643K 115 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 2K 78643K 4672 0 pfkey data 0 0K 1K 78643K 6 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 530 1528K 1540K 78643K 222921 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1578 0 NDP 6 0K 0K 78643K 484 0 temp 104 4236K 6262K 78643K 111886 0 kqueue 13 18K 26K 78643K 700 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1432 0 1429 21 20 1 3 0 8 0 rtentry 112 1183 0 1146 2 0 2 2 0 8 0 unpcb 128 12374 0 12361 138 137 1 9 0 8 0 syncache 296 91 0 91 25 25 0 1 0 8 0 tcpqe 32 19 0 19 7 7 0 1 0 8 0 tcpcb 736 14346 0 14342 398 393 5 21 0 8 4 arp 88 149 0 143 1 0 1 1 0 8 0 ipq 40 352 0 352 32 32 0 1 0 8 0 ipqe 40 4018 0 4018 32 32 0 1 0 8 0 inpcb 304 27344 0 27337 317 313 4 14 0 8 3 rttmr 72 22 0 22 6 6 0 1 0 8 0 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 6 0 6 2 2 0 1 0 8 0 nd6 48 301 0 295 2 1 1 1 0 8 0 pkpcb 40 99 0 99 8 8 0 1 0 8 0 kcovpl 48 59 0 57 1 0 1 1 0 8 0 ppxss 1152 53 0 53 15 15 0 1 0 8 0 pfstscr 40 170 0 166 1 0 1 1 0 8 0 pfosfp 40 17 0 17 1 1 0 1 0 8 0 pfosfpen 112 17 0 17 1 1 0 1 0 8 0 pfrke_plain 168 2 0 2 1 1 0 1 0 8 0 pfrktable 1344 1724 0 1700 6 3 3 3 0 8 0 pftag 88 281 0 273 5 4 1 1 0 8 0 pfstitem 24 140 0 134 1 0 1 1 0 8 0 pfstkey 112 260 0 255 1 0 1 1 0 8 0 pfstate 320 130 0 127 1 0 1 1 0 8 0 pfrule 1360 2016 0 1649 37 6 31 31 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 6640 0 6458 54 42 12 14 0 8 0 art_table 32 6642 0 6459 4 2 2 2 0 8 0 art_node 16 1110 0 1080 1 0 1 1 0 8 0 sysvmsgpl 40 73 0 33 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 32739 0 31278 93 1 92 92 0 8 0 ffsino 240 32740 0 31278 87 0 87 87 0 8 0 nchpl 144 56914 0 55304 60 0 60 60 0 8 0 rtmask 32 4 0 4 1 1 0 1 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 223910 0 223908 11 10 1 1 0 8 0 vcpupl 1984 371 0 0 47 0 47 47 0 8 0 vmpool 528 474 0 103 25 0 25 25 0 8 0 pfiaddrpl 120 536 0 476 3 1 2 2 0 8 0 scsiplug 72 13 0 13 4 4 0 1 0 8 0 scxspl 216 160901 0 160901 39 38 1 8 0 8 1 plimitpl 152 2472 0 2464 1 0 1 1 0 8 0 sigapl 424 18413 0 18363 6 0 6 6 0 8 0 futexpl 64 202032 0 202032 11 10 1 1 0 8 1 knotepl 112 138590 0 138547 2 0 2 2 0 8 0 kqueuepl 184 5535 0 5526 102 101 1 7 0 8 0 pipepl 304 3953 0 3943 125 123 2 6 0 8 1 fdescpl 432 18378 0 18362 12 10 2 3 0 8 0 filepl 120 173902 0 173798 242 236 6 12 0 8 2 lockfpl 104 6086 0 6084 10 9 1 2 0 8 0 lockfspl 48 1460 0 1458 1 0 1 1 0 8 0 sessionpl 144 80 0 70 1 0 1 1 0 8 0 pgrppl 48 174 0 164 1 0 1 1 0 8 0 ucredpl 96 50811 0 50800 1 0 1 1 0 8 0 zombiepl 144 18363 0 18363 4 3 1 1 0 8 1 processpl 1000 18413 0 18363 11 4 7 7 0 8 0 procpl 672 46918 0 46861 55 48 7 7 0 8 1 sosppl 168 130 0 130 27 27 0 1 0 8 0 sockpl 448 41334 0 41311 729 722 7 30 0 8 4 mcl64k 65536 1649 0 1649 41 40 1 1 0 8 1 mcl16k 16384 457 0 457 54 54 0 1 0 8 0 mcl12k 12288 671 0 668 45 44 1 1 0 8 0 mcl9k 9216 612 0 612 57 56 1 1 0 8 1 mcl8k 8192 1847 0 1795 17 10 7 7 0 8 0 mcl4k 4096 1971 0 1967 11 10 1 1 0 8 0 mcl2k2 2112 198 0 198 56 56 0 1 0 8 0 mcl2k 2048 125176 0 124438 124 30 94 101 0 8 0 mtagpl 96 3180 0 3180 50 50 0 7 0 8 0 mbufpl 256 422989 0 421397 1471 1361 110 527 0 8 0 bufpl 280 38843 0 32444 458 0 458 458 0 8 0 anonpl 24 5314962 0 5297332 540 404 136 148 0 188 15 amapchunkpl 152 564940 0 564274 287 259 28 41 0 158 0 amappl16 200 58899 0 58143 346 306 40 54 0 8 0 amappl15 192 3505 0 3498 1 0 1 1 0 8 0 amappl14 184 3642 0 3640 1 0 1 1 0 8 0 amappl13 176 2426 0 2424 1 0 1 1 0 8 0 amappl12 168 2797 0 2795 1 0 1 1 0 8 0 amappl11 160 2277 0 2264 1 0 1 1 0 8 0 amappl10 152 1170 0 1168 1 0 1 1 0 8 0 amappl9 144 2559 0 2557 1 0 1 1 0 8 0 amappl8 136 2877 0 2804 3 0 3 3 0 8 0 amappl7 128 1705 0 1696 1 0 1 1 0 8 0 amappl6 120 2596 0 2587 1 0 1 1 0 8 0 amappl5 112 14243 0 14224 1 0 1 1 0 8 0 amappl4 104 7135 0 7098 2 0 2 2 0 8 0 amappl3 96 5596 0 5579 1 0 1 1 0 8 0 amappl2 88 23957 0 23901 2 0 2 2 0 8 0 amappl1 80 311378 0 310965 13 4 9 12 0 8 0 amappl 88 221135 0 220876 7 0 7 7 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 64 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 18852 0 18465 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 18852 0 18465 3 0 3 3 0 8 0 vmmpekpl 168 110130 0 110076 3 0 3 3 0 8 0 vmmpepl 168 1682783 0 1680171 875 731 144 149 0 357 23 vmsppl 272 18851 0 18465 27 1 26 26 0 8 0 rwobjpl 24 398215 0 396597 45 35 10 12 0 8 0 pdppl 4096 37710 0 37301 481 70 411 413 0 8 2 pvpl 32 8940215 0 8920938 860 661 199 243 0 265 23 pmappl 192 18851 0 18465 20 0 20 20 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 3643 0 2753 49 22 27 37 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff80002169d270) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd806e48fbb0,ffff80002169d490,3,fffffd807f7d8a80) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80704bf3c8,ffff80002169d490,0) at vn_write+0x14c sys/kern/vfs_vnops.c:414 dofilewritev(ffff800021648550,e,ffff80002169d490,0,ffff80002169d590) at dofilewritev+0x1a3 sys/kern/sys_generic.c:380 sys_writev(ffff800021648550,ffff80002169d530,ffff80002169d590) at sys_writev+0xa7 sys/kern/sys_generic.c:327 syscall(ffff80002169d600) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbc2a0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff80002169d270) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd806e48fbb0,ffff80002169d490,3,fffffd807f7d8a80) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80704bf3c8,ffff80002169d490,0) at vn_write+0x14c sys/kern/vfs_vnops.c:414 dofilewritev(ffff800021648550,e,ffff80002169d490,0,ffff80002169d590) at dofilewritev+0x1a3 sys/kern/sys_generic.c:380 sys_writev(ffff800021648550,ffff80002169d530,ffff80002169d590) at sys_writev+0xa7 sys/kern/sys_generic.c:327 syscall(ffff80002169d600) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbc2a0, count: -8