panic: pool_do_get: fdescpl free list modified: page 0xfffffd807f7d5000; item addr 0xfffffd807f7d55d0; offset 0x48=0xdeafbeaf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 215247 3990 0 0 0x4000000 0 syz-executor.3 *408541 94860 0 0x2 0 1K syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8260914b) at panic+0x177 sys/kern/subr_prf.c:198 pool_do_get(ffffffff82bafa48,9,ffff80002e494bc8) at pool_do_get+0x474 sys/kern/subr_pool.c:739 pool_get(ffffffff82bafa48,9) at pool_get+0xe9 sys/kern/subr_pool.c:582 fdcopy(ffff80002e500020) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline] fdcopy(ffff80002e500020) at fdcopy+0x44 sys/kern/kern_descrip.c:1106 process_new(ffff800024d8dce0,ffff80002e500020,1) at process_new+0x2bc sys/kern/kern_fork.c:255 fork1(ffff8000ffff5ce8,1,ffffffff8103cf90,0,ffff80002e494e10,0) at fork1+0x30b sys/kern/kern_fork.c:379 syscall(ffff80002e494e90) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e494e90) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3a40, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.