panic: timeout_add: to_ticks (-1) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *165422 96833 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x15c sys/kern/subr_prf.c:208 timeout_add(ffff800000669260,ffffffff) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,2,ffffffff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff8000149fa090,2,ffff80001495d2d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff8000149fa090,2,ffff80001495d2d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802d0ad800,20005302,ffff8000149fa090,2,fffffd803f7c7960,ffff80001495d2d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80361e3e90,20005302,ffff8000149fa090,ffff80001495d2d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff80001495d2d0,ffff8000149fa1d8,ffff8000149fa1c0) at sys_ioctl+0x62d syscall(ffff8000149fa270) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,96823248010) at Xsyscall+0x128 end of kernel end trace frame: 0x96a3146ec20, 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. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic timeout_add: to_ticks (-1) < 0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x15c sys/kern/subr_prf.c:208 timeout_add(ffff800000669260,ffffffff) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,2,ffffffff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff8000149fa090,2,ffff80001495d2d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff8000149fa090,2,ffff80001495d2d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802d0ad800,20005302,ffff8000149fa090,2,fffffd803f7c7960,ffff80001495d2d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80361e3e90,20005302,ffff8000149fa090,ffff80001495d2d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff80001495d2d0,ffff8000149fa1d8,ffff8000149fa1c0) at sys_ioctl+0x62d syscall(ffff8000149fa270) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,96823248010) at Xsyscall+0x128 end of kernel end trace frame: 0x96a3146ec20, count: -10 ddb> show registers rdi 0xffffffff817d3597 db_enter+0x17 rsi 0x10db __ALIGN_SIZE+0xdb rbp 0xffff8000149f9cb0 rbx 0xffff8000149f9d60 rdx 0x10dc __ALIGN_SIZE+0xdc rcx 0xffff800002b39000 rax 0xffff800002b39000 r8 0xffff8000149f9c70 r9 0x1 r10 0xffff800001938c40 r11 0xe1ba020af106db1e r12 0x3000000008 r13 0xffff8000149f9cc0 r14 0x100 r15 0x1 rip 0xffffffff817d3598 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000149f9ca0 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=165422 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001495dc30,0xffffffff82218b08 process=0xffff8000149a2020 user=0xffff8000149f5000, vmspace=0xfffffd803f014000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 96833 275163 24298 0 2 0 syz-executor.0 *96833 165422 24298 0 7 0x4000000 syz-executor.0 24298 458116 74041 0 3 0x82 nanosleep syz-executor.0 40773 57240 74041 0 2 0x482 syz-executor.1 74041 155664 67983 0 3 0x82 thrsleep syz-fuzzer 74041 24983 67983 0 2 0x4000482 syz-fuzzer 74041 78851 67983 0 3 0x4000082 thrsleep syz-fuzzer 74041 384499 67983 0 3 0x4000082 thrsleep syz-fuzzer 74041 194421 67983 0 3 0x4000082 kqread syz-fuzzer 74041 110242 67983 0 3 0x4000082 thrsleep syz-fuzzer 74041 361731 67983 0 3 0x4000082 thrsleep syz-fuzzer 67983 76706 33133 0 3 0x10008a pause ksh 33133 127573 27116 0 3 0x92 select sshd 70624 255566 1 0 3 0x100083 ttyin getty 27116 104584 1 0 3 0x80 select sshd 20107 346462 15394 73 3 0x100090 kqread syslogd 15394 31886 1 0 3 0x100082 netio syslogd 21031 114874 1 77 3 0x100090 poll dhclient 87024 31163 1 0 3 0x80 poll dhclient 17152 228705 0 0 3 0x14200 pgzero zerothread 95370 112173 0 0 3 0x14200 aiodoned aiodoned 87003 136845 0 0 3 0x14200 syncer update 34500 252802 0 0 3 0x14200 cleaner cleaner 25868 252376 0 0 3 0x14200 reaper reaper 86117 222726 0 0 3 0x14200 pgdaemon pagedaemon 18398 248700 0 0 3 0x14200 bored crynlk 97154 196438 0 0 3 0x14200 bored crypto 48750 23338 0 0 3 0x40014200 acpi0 acpi0 63542 492828 0 0 3 0x14200 bored softnet 90443 453724 0 0 3 0x14200 bored systqmp 54473 252481 0 0 3 0x14200 bored systq 18480 487721 0 0 3 0x40014200 bored softclock 22311 452816 0 0 3 0x40014200 idle0 1 506007 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 Kern Lim devbuf 9440 6311K 6311K 78643K 10533 0 0 pcb 25 9K 9K 78643K 69 0 0 rtable 97 2K 2K 78643K 167 0 0 ifaddr 34 9K 9K 78643K 34 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 0K 78643K 2 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1199 75K 75K 78643K 1210 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 4 0K 0K 78643K 6 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 19K 78643K 26 0 0 proc 40 30K 46K 78643K 247 0 0 subproc 64 65538K 67586K 78643K 68 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 33 2K 2K 78643K 33 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 36 159K 159K 78643K 36 0 0 exec 0 0K 1K 78643K 165 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 72 20K 20K 78643K 790 0 0 UVM aobj 7 2K 2K 78643K 7 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 9 0K 0K 78643K 9 0 0 temp 79 2332K 2396K 78643K 2789 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 30 0 23 1 0 1 1 0 8 0 plimitpl 152 14 0 7 1 0 1 1 0 8 0 rtentry 112 41 0 1 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 10 0 6 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 186 0 0 12 0 12 12 0 8 0 art_table 32 187 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 semapl 112 4 0 2 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1441 0 33 46 0 46 46 0 8 0 ffsino 240 1441 0 33 83 0 83 83 0 8 0 nchpl 144 1680 0 58 61 0 61 61 0 8 0 uvmvnodes 72 1484 0 0 27 0 27 27 0 8 0 vnodes 200 1484 0 0 79 0 79 79 0 8 0 namei 1024 3955 0 3955 1 0 1 1 0 8 1 scxspl 192 3910 0 3910 7 1 6 6 0 8 6 sigapl 432 194 0 181 2 0 2 2 0 8 0 futexpl 56 217 0 217 1 0 1 1 0 8 1 knotepl 112 64 0 37 2 0 2 2 0 8 1 kqueuepl 104 4 0 2 1 0 1 1 0 8 0 pipepl 112 126 0 107 2 1 1 1 0 8 0 fdescpl 424 195 0 181 2 0 2 2 0 8 0 filepl 120 976 0 879 4 0 4 4 0 8 1 lockfpl 104 7 0 6 2 1 1 1 0 8 0 lockfspl 32 4 0 3 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 64 0 57 1 0 1 1 0 8 0 zombiepl 144 181 0 180 2 1 1 1 0 8 0 processpl 840 208 0 180 5 1 4 4 0 8 0 procpl 600 226 0 191 4 0 4 4 0 8 1 sockpl 384 82 0 63 3 0 3 3 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl4k 4096 9 0 9 2 1 1 1 0 8 1 mcl2k 2048 41750 0 41719 10 1 9 9 0 8 4 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 68422 0 68348 8 2 6 6 0 8 1 bufpl 256 5209 0 1046 261 0 261 261 0 8 0 anonpl 16 26159 0 19054 31 2 29 29 0 62 0 amapchunkpl 152 706 0 627 5 0 5 5 0 158 0 amappl16 192 480 0 115 19 0 19 19 0 8 0 amappl15 184 10 0 7 1 0 1 1 0 8 0 amappl14 176 8 0 6 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 10 0 8 2 1 1 1 0 8 0 amappl11 152 180 0 171 1 0 1 1 0 8 0 amappl10 144 60 0 57 1 0 1 1 0 8 0 amappl9 136 335 0 332 1 0 1 1 0 8 0 amappl8 128 134 0 116 1 0 1 1 0 8 0 amappl7 120 38 0 33 1 0 1 1 0 8 0 amappl6 112 58 0 51 1 0 1 1 0 8 0 amappl5 104 157 0 146 1 0 1 1 0 8 0 amappl4 96 262 0 241 1 0 1 1 0 8 0 amappl3 88 124 0 119 1 0 1 1 0 8 0 amappl2 80 668 0 616 2 0 2 2 0 8 0 amappl1 72 12753 0 12341 25 7 18 19 0 8 8 amappl 72 434 0 403 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 195 0 181 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 195 0 181 1 0 1 1 0 8 0 vmmpekpl 168 5377 0 5359 1 0 1 1 0 8 0 vmmpepl 168 27453 0 26177 83 13 70 70 0 357 14 vmsppl 264 194 0 181 1 0 1 1 0 8 0 pdppl 4096 396 0 362 5 0 5 5 0 8 0 pvpl 32 102237 0 92248 97 2 95 95 0 265 14 pmappl 192 194 0 181 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 390 0 6 11 0 11 11 0 8 0