uvm_fault(0xffffffff82a30160, 0xffff80002115f002, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x45: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *388438 74857 73 0x1100010 0 0 syslogd memset() at memset+0x45 ffs_write(ffff800021643300) at ffs_write+0x93c VOP_WRITE(fffffd806e601750,ffff800021643520,3,fffffd807f7d7c60) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806edc55a8,ffff800021643520,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000ffff87e8,e,ffff800021643520,0,ffff800021643620) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_writev(ffff8000ffff87e8,ffff8000216435c0,ffff800021643620) at sys_writev+0xa7 sys/kern/sys_generic.c:328 syscall(ffff800021643690) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe73b0, 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(0xffffffff82a30160, 0xffff80002115f002, 0, 2) -> d ddb> trace memset() at memset+0x45 ffs_write(ffff800021643300) at ffs_write+0x93c VOP_WRITE(fffffd806e601750,ffff800021643520,3,fffffd807f7d7c60) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806edc55a8,ffff800021643520,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000ffff87e8,e,ffff800021643520,0,ffff800021643620) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_writev(ffff8000ffff87e8,ffff8000216435c0,ffff800021643620) at sys_writev+0xa7 sys/kern/sys_generic.c:328 syscall(ffff800021643690) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe73b0, count: -8 ddb> show registers rdi 0xffff80002115f002 rsi 0 rbp 0xffff800021643220 rbx 0x1 rdx 0x6 rcx 0x6 rax 0 r8 0x3ff8 __ALIGN_SIZE+0x2ff8 r9 0xffff800021643178 r10 0x480b22f3507be06f r11 0xffff80002115f002 r12 0x30002 acpi_pdirpa+0x1be6a r13 0xfffffd806ed74988 r14 0x4000 __ALIGN_SIZE+0x3000 r15 0xfffffd806ed74970 rip 0xffffffff823965d5 memset+0x45 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800021643028 ss 0x10 memset+0x45: repe stosb %es:(%rdi) ddb> show proc PROC (syslogd) pid=388438 stat=onproc flags process=1100010 proc=0 pri=24, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff8d28,0xffff80002160b280 process=0xffff8000ffff63f8 user=0xffff80002163e000, vmspace=0xfffffd807f015990 estcpu=1, cpticks=2, pctcpu=0.2 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 31548 510533 27819 0 2 0x482 syz-executor171176059 27819 134387 63274 0 3 0x10008a sigsusp ksh 63274 313173 86820 0 3 0x9a kqread sshd 88100 108466 1 0 3 0x100083 ttyin getty 86820 504415 1 0 3 0x88 kqread sshd *74857 388438 26166 73 7 0x1100010 syslogd 26166 42027 1 0 3 0x100082 netio syslogd 51182 81405 1 0 3 0x100080 kqread resolvd 50512 450739 23811 77 3 0x100092 kqread dhcpleased 44380 344297 23811 77 3 0x100092 kqread dhcpleased 23811 103476 1 0 3 0x80 kqread dhcpleased 69769 357670 0 0 3 0x14200 bored smr 570 413157 0 0 3 0x14200 pgzero zerothread 1615 100951 0 0 3 0x14200 aiodoned aiodoned 96969 120182 0 0 3 0x14200 syncer update 95729 404552 0 0 3 0x14200 cleaner cleaner 19563 506572 0 0 3 0x14200 reaper reaper 96820 351341 0 0 3 0x14200 pgdaemon pagedaemon 11236 474699 0 0 3 0x14200 bored viomb 12233 521673 0 0 3 0x40014200 acpi0 acpi0 70912 117453 0 0 3 0x14200 bored softnet 76525 276252 0 0 3 0x14200 bored softnet 37824 18499 0 0 3 0x14200 bored softnet 18962 86600 0 0 3 0x14200 bored softnet 85836 244562 0 0 3 0x14200 bored systqmp 34906 31956 0 0 3 0x14200 bored systq 17361 71843 0 0 3 0x40014200 bored softclock 6016 318401 0 0 3 0x40014200 idle0 1 416264 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 10135 6382K 6413K 78643K 11225 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 104 0 ifaddr 24 7K 7K 78643K 24 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 1628 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1166 73K 73K 78643K 1180 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 58K 59K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 1994 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 51 3K 5K 78643K 2859 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4709K 4773K 78643K 3876 0 kqueue 11 16K 18K 78643K 24 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 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 136 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 2 0 1 0 8 0 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 312 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1417 0 38 87 0 87 87 0 8 0 ffsino 240 1417 0 38 82 0 82 82 0 8 0 nchpl 144 1604 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1427 0 0 30 0 30 30 0 8 0 vnodes 224 1427 0 0 84 0 84 84 0 8 0 namei 1024 12191 0 12191 2 1 1 1 0 8 1 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 7113 0 7113 13 12 1 8 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 1897 0 1867 4 0 4 4 0 8 0 knotepl 120 18505 0 18476 3 2 1 2 0 8 0 kqueuepl 184 20 0 13 1 0 1 1 0 8 0 pipepl 304 79 0 76 2 1 1 1 0 8 0 fdescpl 432 1881 0 1868 2 0 2 2 0 8 0 filepl 120 7455 0 7402 2 0 2 2 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 65 0 54 1 0 1 1 0 8 0 zombiepl 144 1868 0 1867 2 1 1 1 0 8 0 processpl 1000 1897 0 1867 5 1 4 5 0 8 0 procpl 672 1897 0 1867 3 0 3 3 0 8 0 sockpl 448 75 0 53 3 0 3 3 0 8 0 mcl8k 8192 9 0 9 2 2 0 1 0 8 0 mcl4k 4096 5 0 5 2 2 0 1 0 8 0 mcl2k 2048 6431 0 6402 8 4 4 6 0 8 0 mtagpl 96 3 0 3 1 1 0 1 0 8 0 mbufpl 256 15921 0 15853 7 1 6 6 0 8 0 bufpl 288 6757 0 468 450 0 450 450 0 8 0 anonpl 24 46463 0 44684 15 4 11 13 0 188 0 amapchunkpl 152 4175 0 4089 5 1 4 5 0 158 0 amappl16 200 1687 0 1683 1 0 1 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 3 0 3 2 2 0 1 0 8 0 amappl11 160 60 0 47 1 0 1 1 0 8 0 amappl10 152 1 0 0 1 0 1 1 0 8 0 amappl9 144 483 0 481 1 0 1 1 0 8 0 amappl8 136 333 0 332 2 1 1 1 0 8 0 amappl7 128 49 0 46 1 0 1 1 0 8 0 amappl6 120 92 0 82 1 0 1 1 0 8 0 amappl5 112 1684 0 1675 1 0 1 1 0 8 0 amappl4 104 566 0 547 1 0 1 1 0 8 0 amappl3 96 348 0 329 1 0 1 1 0 8 0 amappl2 88 419 0 381 2 0 2 2 0 8 0 amappl1 80 15132 0 14758 11 2 9 9 0 8 0 amappl 88 2606 0 2571 1 0 1 1 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1881 0 1868 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1881 0 1868 1 0 1 1 0 8 0 vmmpekpl 168 9182 0 9170 1 0 1 1 0 8 0 vmmpepl 168 50537 0 49761 44 9 35 38 0 357 0 vmsppl 272 1880 0 1868 2 1 1 2 0 8 0 rwobjpl 24 10681 0 8735 13 0 13 13 0 8 0 pdppl 4096 3768 0 3736 52 18 34 40 0 8 2 pvpl 32 164180 0 160561 40 10 30 33 0 265 0 pmappl 216 1880 0 1868 1 0 1 1 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 713 0 31 20 0 20 20 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800021643300) at ffs_write+0x93c VOP_WRITE(fffffd806e601750,ffff800021643520,3,fffffd807f7d7c60) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806edc55a8,ffff800021643520,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000ffff87e8,e,ffff800021643520,0,ffff800021643620) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_writev(ffff8000ffff87e8,ffff8000216435c0,ffff800021643620) at sys_writev+0xa7 sys/kern/sys_generic.c:328 syscall(ffff800021643690) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe73b0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800021643300) at ffs_write+0x93c VOP_WRITE(fffffd806e601750,ffff800021643520,3,fffffd807f7d7c60) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806edc55a8,ffff800021643520,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000ffff87e8,e,ffff800021643520,0,ffff800021643620) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_writev(ffff8000ffff87e8,ffff8000216435c0,ffff800021643620) at sys_writev+0xa7 sys/kern/sys_generic.c:328 syscall(ffff800021643690) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe73b0, count: -8