syzbot

panic: vop_generic_badop
Stopped at      db_enter+0x1c:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*468740  92909      0   0x8000002          0    0  syz-executor.5
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8286bb66) at panic+0x165 sys/kern/subr_prf.c:198
vop_generic_badop(ffff80002d300c58) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd807e33ba58,fffffd806ced2a00) at VOP_STRATEGY+0x9f sys/kern/vfs_vops.c:628
bwrite(fffffd806ced2a00) at bwrite+0x1ca sys/kern/vfs_bio.c:757
VOP_BWRITE(fffffd806ced2a00) at VOP_BWRITE+0x4e sys/kern/vfs_vops.c:640
ufs_mkdir(ffff80002d300ed0) at ufs_mkdir+0x445 sys/ufs/ufs/ufs_vnops.c:1165
VOP_MKDIR(fffffd8076daa0e0,ffff80002d301030,ffff80002d301060,ffff80002d300f60) at VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388
domkdirat(ffff80002a62a7e8,ffffff9c,77a484289850,1ff) at domkdirat+0x125 sys/kern/vfs_syscalls.c:3077
syscall(ffff80002d3011e0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77a4842898c0, count: 4
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.