uvm_fault(0xffffffff83a0a918, 0xffff800022602004, 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 *368528 81698 0 0x2 0 0 syz-executor ufs_readdir(ffff80002a7fd0c0) at ufs_readdir+0x26e sys/ufs/ufs/ufs_vnops.c:1397 VOP_READDIR(fffff30066d0d558,ffff80002a7fd148,fffff30007ffd820,ffff80002a7fd18c) at VOP_READDIR+0x125 sys/kern/vfs_vops.c:453 sys_getdents(ffff80002a757a00,ffff80002a7fd2d0,ffff80002a7fd220) at sys_getdents+0x2dd sys/kern/vfs_syscalls.c:3132 syscall(ffff80002a7fd2d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7fd2d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x731361d068d0, 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.