uvm_fault(0xffffffff82e86fb0, 0xffff80001c862000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *365957 54393 0 0 0 0 syz-executor121655267 memset() at memset+0x52 VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352 syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d8ea6d887d0, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff82e86fb0, 0xffff80001c862000, 0, 2) -> d ddb> trace memset() at memset+0x52 VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352 syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d8ea6d887d0, count: -7 ddb> show registers rdi 0xffff80001c862000 rsi 0 rbp 0xffff80002a68b580 rbx 0xe rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0xffff80002a68b4f8 r10 0x5a499870ce4eed5 r11 0xffff80001c862000 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xffff80001c862000 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff811e0032 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002a68b4b8 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor121655267) tid=365957 pid=54393 tcnt=1 stat=onproc flags process=0 proc=0 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a5f62c0,0xffff80002a5f6d70 process=0xffff80002a603ab8 user=0xffff80002a686000, vmspace=0xfffffd806d3719b0 estcpu=1, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 24146 407532 12941 0 2 0 syz-executor121655267 4342 404944 97765 0 2 0 syz-executor121655267 39702 381700 39039 0 2 0 syz-executor121655267 75804 85728 12947 0 2 0 syz-executor121655267 16741 262755 5155 0 2 0 syz-executor121655267 *54393 365957 4816 0 7 0 syz-executor121655267 92851 429543 39930 0 2 0x80 syz-executor121655267 7258 408804 58342 0 2 0 syz-executor121655267 39930 468160 25315 0 2 0x480 syz-executor121655267 12941 236357 25315 0 2 0x480 syz-executor121655267 39039 124797 25315 0 2 0x480 syz-executor121655267 12947 76338 25315 0 2 0x480 syz-executor121655267 5155 397553 25315 0 2 0x480 syz-executor121655267 97765 518388 25315 0 2 0x480 syz-executor121655267 4816 276905 25315 0 2 0x480 syz-executor121655267 58342 253635 25315 0 2 0x480 syz-executor121655267 25315 282748 92512 0 3 0x82 nanoslp syz-executor121655267 92512 285573 19003 0 3 0x10008a sigsusp ksh 19003 304151 6922 0 3 0x9a kqread sshd 96559 51111 1 0 3 0x100083 ttyin getty 6922 467035 1 0 3 0x88 kqread sshd 12968 315655 93933 73 2 0x1100010 syslogd 93933 47088 1 0 3 0x100082 netio syslogd 61909 298144 1 0 3 0x100080 kqread resolvd 87575 522683 84825 77 3 0x100092 kqread dhcpleased 51482 524267 84825 77 3 0x100092 kqread dhcpleased 84825 446059 1 0 3 0x80 kqread dhcpleased 79596 368776 0 0 3 0x14200 bored smr 79996 487569 0 0 2 0x14200 zerothread 24142 330469 0 0 3 0x14200 aiodoned aiodoned 45677 69759 0 0 3 0x14200 syncer update 2148 437357 0 0 3 0x14200 cleaner cleaner 6284 376218 0 0 3 0x14200 reaper reaper 2552 292838 0 0 3 0x14200 pgdaemon pagedaemon 37587 302027 0 0 3 0x14200 bored viomb 23865 7012 0 0 3 0x40014200 acpi0 acpi0 85646 198265 0 0 3 0x14200 bored softnet3 90650 127883 0 0 3 0x14200 bored softnet2 60692 473758 0 0 3 0x14200 bored softnet1 51939 359195 0 0 2 0x14200 softnet0 39771 324456 0 0 3 0x14200 bored systqmp 70512 399103 0 0 3 0x14200 bored systq 56886 374886 0 0 3 0x40014200 tmoslp softclock 18589 488195 0 0 3 0x40014200 idle0 1 376423 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 10138 6382K 6413K 166960K 11216 0 pcb 15 10K 10K 166960K 15 0 rtable 58 1K 2K 166960K 110 0 pf 12 6K 6K 166960K 12 0 ifaddr 11 5K 5K 166960K 11 0 ifgroup 17 1K 1K 166960K 17 0 counters 22 16K 16K 166960K 22 0 ioctlops 0 0K 2K 166960K 21 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1174 73K 74K 166960K 1188 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 1 0K 0K 166960K 1 0 proc 55 58K 59K 166960K 246 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 11 0K 0K 166960K 11 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 25 122K 122K 166960K 25 0 exec 0 0K 1K 166960K 243 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 101 6K 6K 166960K 2190 0 UVM aobj 3 2K 2K 166960K 3 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 3 0K 0K 166960K 3 0 temp 1 6748K 6812K 166960K 2780 0 kqueue 11 16K 18K 166960K 24 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 134 0 134 1 0 1 1 0 8 1 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 360 26 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 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 1423 0 37 87 0 87 87 0 8 0 ffsino 240 1423 0 37 82 0 82 82 0 8 0 nchpl 144 1607 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1433 0 0 30 0 30 30 0 8 0 vnodes 216 1433 0 0 80 0 80 80 0 8 0 namei 1024 4281 0 4277 2 0 2 2 0 8 1 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5790 0 5790 3 0 3 3 1 8 3 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 330 0 285 6 0 6 6 0 8 0 knotepl 120 3612 0 3583 2 0 2 2 0 8 1 kqueuepl 184 20 0 13 1 0 1 1 0 8 0 pipepl 288 87 0 84 1 0 1 1 0 8 0 fdescpl 432 314 0 285 4 0 4 4 0 8 0 filepl 120 1148 0 1085 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 104 68 0 57 1 0 1 1 0 8 0 zombiepl 144 285 0 285 1 0 1 1 0 8 1 processpl 1072 330 0 285 4 0 4 4 0 8 0 procpl 680 330 0 285 4 0 4 4 0 8 0 sockpl 488 79 0 57 3 0 3 3 0 8 0 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 10 0 10 1 0 1 1 0 8 1 mcl2k 2048 12115 0 12075 28 15 13 28 0 8 7 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 19489 0 19444 15 3 12 15 0 8 7 bufpl 280 2885 0 87 200 0 200 200 0 8 0 anonpl 24 177466 0 175127 24 0 24 24 0 188 6 amapchunkpl 152 8174 0 8027 7 0 7 7 0 158 1 amappl16 200 5237 0 5199 5 0 5 5 0 8 1 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 105 0 96 1 0 1 1 0 8 0 amappl13 176 8 0 7 1 0 1 1 0 8 0 amappl12 168 792 0 780 1 0 1 1 0 8 0 amappl11 160 60 0 50 1 0 1 1 0 8 0 amappl10 152 16 0 16 1 0 1 1 0 8 1 amappl9 144 101 0 101 1 0 1 1 0 8 1 amappl8 136 69 0 67 1 0 1 1 0 8 0 amappl7 128 93 0 82 1 0 1 1 0 8 0 amappl6 120 133 0 128 1 0 1 1 0 8 0 amappl5 112 96 0 88 1 0 1 1 0 8 0 amappl4 104 333 0 307 1 0 1 1 0 8 0 amappl3 96 2441 0 2411 1 0 1 1 0 8 0 amappl2 88 647 0 595 2 0 2 2 0 8 0 amappl1 80 8901 0 8462 11 0 11 11 0 8 1 amappl 88 1919 0 1856 2 0 2 2 0 92 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 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 24 314 0 285 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 314 0 285 1 0 1 1 0 8 0 vmmpekpl 168 6845 0 6826 1 0 1 1 0 8 0 vmmpepl 168 34826 0 33641 54 0 54 54 0 357 1 vmsppl 352 313 0 285 3 0 3 3 0 8 0 rwobjpl 24 18801 0 16716 14 0 14 14 0 8 1 pdppl 4096 634 0 570 78 14 64 64 0 8 0 pvpl 32 272208 0 267316 52 0 52 52 0 265 10 pmappl 216 313 0 285 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 314 0 32 9 0 9 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x52 VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352 syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d8ea6d887d0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x52 VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352 syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d8ea6d887d0, count: -7