uvm_fault(0xffffffff83a06930, 0xffff800027ac2004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_readdir+0x26e: movzwl 0x4(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND *459999 92991 0 0x2 0 0 syz-executor ufs_readdir(ffff80002a8a37c0) at ufs_readdir+0x26e sys/ufs/ufs/ufs_vnops.c:1397 VOP_READDIR(fffffd806c950d90,ffff80002a8a3848,fffffd8007ffd8f0,ffff80002a8a388c) at VOP_READDIR+0x125 sys/kern/vfs_vops.c:453 sys_getdents(ffff80002a7362a0,ffff80002a8a39d0,ffff80002a8a3920) at sys_getdents+0x2dd sys/kern/vfs_syscalls.c:3219 syscall(ffff80002a8a39d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8a39d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d0db0a40940, count: 10 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(0xffffffff83a06930, 0xffff800027ac2004, 0, 1) -> d ddb> trace ufs_readdir(ffff80002a8a37c0) at ufs_readdir+0x26e sys/ufs/ufs/ufs_vnops.c:1397 VOP_READDIR(fffffd806c950d90,ffff80002a8a3848,fffffd8007ffd8f0,ffff80002a8a388c) at VOP_READDIR+0x125 sys/kern/vfs_vops.c:453 sys_getdents(ffff80002a7362a0,ffff80002a8a39d0,ffff80002a8a3920) at sys_getdents+0x2dd sys/kern/vfs_syscalls.c:3219 syscall(ffff80002a8a39d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8a39d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d0db0a40940, count: -5 ddb> show registers rdi 0x200 rsi 0x800 rbp 0xffff80002a8a37b0 rbx 0x200 rdx 0 rcx 0xfffffd806e858468 rax 0xffff800027ac2200 r8 0xffffffffffffffff r9 0x2 r10 0x98b6780d1630acf5 r11 0x55fc0c02a25743f2 r12 0 r13 0xffff80002a8a3848 r14 0xffff800027ac2000 r15 0xffff800027ac2008 rip 0xffffffff8102b32e ufs_readdir+0x26e cs 0x8 rflags 0x10283 __ALIGN_SIZE+0xf283 rsp 0xffff80002a8a3600 ss 0x10 ufs_readdir+0x26e: movzwl 0x4(%r14),%ebx ddb> show proc PROC (syz-executor) tid=459999 pid=92991 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7374c8,0xffff80003c8fafc0 process=0xffff80002a79fa90 user=0xffff80002a89e000, vmspace=0xfffffd80711f4008 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 70104 501908 0 0 3 0x14200 acct acct 49885 355923 1 0 3 0x100083 ttyin getty *92991 459999 92620 0 7 0x2 syz-executor 92620 145059 1 0 3 0x82 wait syz-executor 20332 404600 0 0 3 0x14200 bored smr 75110 392582 0 0 2 0x14200 zerothread 59162 339407 0 0 3 0x14200 aiodoned aiodoned 88888 410131 0 0 3 0x14200 syncer update 38520 315724 0 0 3 0x14200 cleaner cleaner 57202 146904 0 0 3 0x14200 reaper reaper 56155 174139 0 0 3 0x14200 pgdaemon pagedaemon 90882 223503 0 0 3 0x14200 bored viomb 19785 488128 0 0 3 0x40014200 acpi0 acpi0 69348 202288 0 0 3 0x14200 bored softnet0 94458 36876 0 0 3 0x14200 smrbar systqmp 55390 112261 0 0 3 0x14200 bored systq 99894 277315 0 0 3 0x40014200 tmoslp softclock 79452 19296 0 0 3 0x40014200 idle0 1 433992 0 0 3 0x80082 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 11025 12160K 12342K 166960K 12985 0 pcb 17 12K 12K 166960K 134 0 rtable 123 15K 17K 166960K 475 0 pf 29 13K 20K 166960K 181 0 ifaddr 21 3K 7K 166960K 83 0 ifgroup 34 1K 2K 166960K 126 0 sysctl 3 1K 9K 166960K 8 0 counters 29 17K 18K 166960K 80 0 ioctlops 0 0K 4K 166960K 148 0 iov 0 0K 20K 166960K 22 0 mount 1 1K 1K 166960K 1 0 log 2 0K 0K 166960K 6 0 vnodes 1299 82K 82K 166960K 1949 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 28K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 23 3K 3K 166960K 40 0 dirhash 12 2K 3K 166960K 45 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 4 13K 97K 166960K 1108 0 sigio 0 0K 0K 166960K 15 0 proc 20 25K 124K 166960K 539 0 subproc 27 1K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 47 0 in_multi 33 2K 7K 166960K 127 0 ether_multi 1 0K 0K 166960K 12 0 mrt 0 0K 0K 166960K 42 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 420 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 40 39K 173K 166960K 10697 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 7 14K 96K 166960K 2240 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 28 0 NDP 7 0K 2K 166960K 58 0 temp 24 9103K 9176K 166960K 20019 0 kqueue 1 2K 26K 166960K 175 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 50 0 50 2 1 1 1 0 8 1 rtentry 136 132 0 95 4 0 4 4 0 8 0 unpcb 144 261 0 261 2 1 1 1 0 8 1 syncache 336 11 0 11 2 1 1 1 0 8 1 tcpcb 736 118 0 117 1 0 1 1 0 8 0 arp 96 20 0 13 1 0 1 1 0 8 0 inpcb 328 409 0 408 2 1 1 2 0 8 0 nd6 112 24 0 18 1 0 1 1 0 8 0 pkpcb 40 6 0 6 2 1 1 1 0 8 1 kcovpl 48 8 0 5 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 0 1 1 0 8 1 ppxss 1072 41 0 41 2 1 1 1 0 8 1 pppxif 1416 2 0 2 1 0 1 1 0 8 1 pfstscr 40