panic: timeout_add: to_ticks (-979202174) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 7526 3127 0 0x1000 0x4080000 0K syz-executor.1 38751 3127 0 0x1000 0x4080000 1 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 timeout_add(ffff80000066d060,c5a28f82) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,40175f11,c5a28f82,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c4f6e0,2,ffff800020b42e28) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c4f6e0,2,ffff800020b42e28) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8064ff7438,20005302,ffff800020c4f6e0,2,fffffd807f7c7ba0,ffff800020b42e28) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8068170b68,20005302,ffff800020c4f6e0,ffff800020b42e28) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42e28,ffff800020c4f828,ffff800020c4f810) at sys_ioctl+0x646 syscall(ffff800020c4f8c0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c4f8c0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,6c967aad0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x6cc5074de50, count: 5 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.