uvm_fault(0xffffffff83a72490, 0xffff800020cb2004, 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 *240919 75756 0 0x2 0 0 syz-executor ufs_readdir(ffff80002a8676a0) at ufs_readdir+0x26e sys/ufs/ufs/ufs_vnops.c:1397 VOP_READDIR(fffffd00700136e8,ffff80002a867728,fffffd0007ffd8f0,ffff80002a86776c) at VOP_READDIR+0x125 sys/kern/vfs_vops.c:453 sys_getdents(ffff80002a736008,ffff80002a8678b0,ffff80002a867800) at sys_getdents+0x2dd sys/kern/vfs_syscalls.c:3132 syscall(ffff80002a8678b0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8678b0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77f61900cfd0, 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(0xffffffff83a72490, 0xffff800020cb2004, 0, 1) -> d ddb> trace ufs_readdir(ffff80002a8676a0) at ufs_readdir+0x26e sys/ufs/ufs/ufs_vnops.c:1397 VOP_READDIR(fffffd00700136e8,ffff80002a867728,fffffd0007ffd8f0,ffff80002a86776c) at VOP_READDIR+0x125 sys/kern/vfs_vops.c:453 sys_getdents(ffff80002a736008,ffff80002a8678b0,ffff80002a867800) at sys_getdents+0x2dd sys/kern/vfs_syscalls.c:3132 syscall(ffff80002a8678b0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a8678b0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77f61900cfd0, count: -5 ddb> show registers rdi 0x200 rsi 0x800 rbp 0xffff80002a867690 rbx 0x200 rdx 0 rcx 0xfffffd006a200f30 rax 0xffff800020cb2200 r8 0xffffffffffffffff r9 0x2 r10 0xecade927a42d0126 r11 0x88fae52ea457114e r12 0 r13 0xffff80002a867728 r14 0xffff800020cb2000 r15 0xffff800020cb2008 rip 0xffffffff81380c1e ufs_readdir+0x26e cs 0x8 rflags 0x10283 __ALIGN_SIZE+0xf283 rsp 0xffff80002a8674e0 ss 0x10 ufs_readdir+0x26e: movzwl 0x4(%r14),%ebx ddb> show proc PROC (syz-executor) tid=240919 pid=75756 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=0xffff80002a737c90,0xffff80002a737240 process=0xffff80002a79ed10 user=0xffff80002a862000, vmspace=0xfffffd0070315458 estcpu=36, cpticks=3, pctcpu=0.1, user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 15751 307400 83130 0 2 0x100000 sh 83130 268109 29933 0 3 0x10008a sigsusp sh 35636 356151 73557 0 2 0 syz-executor 35636 180129 73557 0 3 0x4000080 fsleep syz-executor 91100 234940 99725 0 2 0 syz-executor 91100 226954 99725 0 2 0x4000000 syz-executor 23540 189056 27983 0 2 0 syz-executor 23540 459254 27983 0 3 0x4000080 fsleep syz-executor 29933 315214 6937 0 3 0x82 wait syz-executor 95164 172386 14729 0 2 0xc80 syz-executor 95164 434554 14729 0 3 0x4000080 ttyout syz-executor 95164 391114 14729 0 3 0x4000080 fsleep syz-executor 84928 474390 0 0 3 0x14280 nfsidl nfsio 52141 415073 0 0 3 0x14280 nfsidl nfsio 1093 310533 0 0 3 0x14280 nfsidl nfsio 20617 31748 0 0 3 0x14280 nfsidl nfsio 19407 453992 0 0 3 0x14280 nfsidl nfsio 64697 442808 0 0 3 0x14280 nfsidl nfsio 20530 325003 0 0 3 0x14280 nfsidl nfsio 97572 242405 0 0 3 0x14280 nfsidl nfsio 68330 280958 0 0 3 0x14280 nfsidl nfsio 25685 487554 0 0 3 0x14280 nfsidl nfsio 36941 280768 0 0 3 0x14280 nfsidl nfsio 19879 147328 0 0 3 0x14280 nfsidl nfsio 53353 30283 0 0 3 0x14280 nfsidl nfsio 78975 519596 0 0 3 0x14280 nfsidl nfsio 33002 156608 0 0 3 0x14280 nfsidl nfsio 5074 182697 0 0 3 0x14280 nfsidl nfsio 55013 3588 0 0 3 0x14280 nfsidl nfsio 96935 315852 0 0 3 0x14280 nfsidl nfsio 7185 187308 0 0 3 0x14280 nfsidl nfsio 35235 405100 0 0 3 0x14280 nfsidl nfsio 27983 262650 6937 0 2 0xc82 syz-executor 13776 119624 1 0 3 0x80 nanoslp init 73557 233600 6937 0 3 0x82 nanoslp syz-executor *75756 240919 6937 0 7 0x2 syz-executor 14729 175040 6937 0 3 0x82 nanoslp syz-executor 99725 309307 6937 0 2 0xc82 syz-executor 61678 118953 6937 0 3 0x82 nanoslp syz-executor 59627 136663 6937 0 3 0x82 wait syz-executor 6937 446794 1 0 2 0x2 syz-executor 53756 292037 0 0 3 0x14200 bored smr 79196 429150 0 0 2 0x14200 zerothread 89321 176670 0 0 3 0x14200 aiodoned aiodoned 44986 500922 0 0 3 0x14200 syncer update 97143 117368 0 0 3 0x14200 cleaner cleaner 42046 204174 0 0 3 0x14200 reaper reaper 55656 463439 0 0 3 0x14200 pgdaemon pagedaemon 61702 235042 0 0 3 0x14200 bored viomb 37119 7331 0 0 3 0x40014200 acpi0 acpi0 40854 136236 0 0 2 0x14200 softnet0 22677 269662 0 0 3 0x14200 bored systqmp 5747 35914 0 0 3 0x14200 bored systq 94072 245051 0 0 3 0x40014200 tmoslp softclock 1201 450136 0 0 3 0x40014200 idle0 1 428508 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 11024 12094K 12341K 166960K 12510 0 pcb 17 12K 12K 166960K 81 0 rtable 208 8K 10K 166960K 551 0 pf 29 12K 17K 166960K 77 0 ifaddr 36 6K 7K 166960K 80 0 ifgroup 44 1K 2K 166960K 97 0 sysctl 1 1K 9K 166960K 9 0 counters 32 17K 18K 166960K 57 0 ioctlops 0 0K 4K 166960K 98 0 iov 0 0K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1361 86K 86K 166960K 1742 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 51 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 89K 166960K 460 0 sigio 0 0K 0K 166960K 5 0 proc 11 17K 83K 166960K 652 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 90 0 in_multi 81 5K 7K 166960K 159 0 ether_multi 1 0K 0K 166960K 2 0 mrt 2 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 447 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 130 71K 159K 166960K 5487 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 19 38K 92K 166960K 1681 0 memdesc 1 4K 4K 166960K 1 0