panic: timeout_add: to_ticks (-2) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *489092 18496 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,fffffffe) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,1f,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a2bc20,2,ffff80001494a4d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a2bc20,2,ffff80001494a4d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80396d56d0,20005302,ffff800014a2bc20,2,fffffd803f7c76c0,ffff80001494a4d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd803eb73d98,20005302,ffff800014a2bc20,ffff80001494a4d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff80001494a4d0,ffff800014a2bd68,ffff800014a2bd50) at sys_ioctl+0x62d syscall(ffff800014a2be00) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,6965579e010) at Xsyscall+0x128 end of kernel end trace frame: 0x6990ff79ca0, 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 (-2) < 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,fffffffe) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,1f,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a2bc20,2,ffff80001494a4d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a2bc20,2,ffff80001494a4d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80396d56d0,20005302,ffff800014a2bc20,2,fffffd803f7c76c0,ffff80001494a4d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd803eb73d98,20005302,ffff800014a2bc20,ffff80001494a4d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff80001494a4d0,ffff800014a2bd68,ffff800014a2bd50) at sys_ioctl+0x62d syscall(ffff800014a2be00) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,6965579e010) at Xsyscall+0x128 end of kernel end trace frame: 0x6990ff79ca0, count: -10 ddb> show registers rdi 0xffffffff814d63b7 db_enter+0x17 rsi 0x11f9 __ALIGN_SIZE+0x1f9 rbp 0xffff800014a2b840 rbx 0xffff800014a2b8f0 rdx 0x11fa __ALIGN_SIZE+0x1fa rcx 0xffff800002b3a000 rax 0xffff800002b3a000 r8 0xffff800014a2b800 r9 0x1 r10 0xffff800001939a00 r11 0xa2e791dc941b7c27 r12 0x3000000008 r13 0xffff800014a2b850 r14 0x100 r15 0x1 rip 0xffffffff814d63b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a2b830 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=489092 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff80001494ae30,0xffffffff822354f0 process=0xffff8000149a89f8 user=0xffff800014a26000, vmspace=0xfffffd803f014e70 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 18496 296852 67374 0 2 0 syz-executor.0 *18496 489092 67374 0 7 0x4000000 syz-executor.0 71941 110162 21236 0 2 0 syz-executor.1 71941 43 21236 0 3 0x4000080 fsleep syz-executor.1 44087 429429 1 0 3 0x100083 ttyin getty 73665 237330 0 0 3 0x14200 bored sosplice 67374 222790 89241 0 3 0x82 nanosleep syz-executor.0 21236 234987 89241 0 3 0x82 nanosleep syz-executor.1 89241 274467 90330 0 3 0x82 thrsleep syz-fuzzer 89241 14430 90330 0 3 0x4000082 thrsleep syz-fuzzer 89241 125487 90330 0 3 0x4000082 thrsleep syz-fuzzer 89241 183722 90330 0 3 0x4000082 thrsleep syz-fuzzer 89241 344724 90330 0 3 0x4000082 kqread syz-fuzzer 89241 499215 90330 0 3 0x4000082 thrsleep syz-fuzzer 89241 236372 90330 0 3 0x4000082 thrsleep syz-fuzzer 90330 377857 38203 0 3 0x10008a pause ksh 38203 364582 39157 0 3 0x92 select sshd 39157 168188 1 0 3 0x80 select sshd 95575 18234 87573 73 3 0x100090 kqread syslogd 87573 47538 1 0 3 0x100082 netio syslogd 17333 284678 1 77 3 0x100090 poll dhclient 44825 11355 1 0 3 0x80 poll dhclient 37168 60238 0 0 2 0x14200 zerothread 3646 64141 0 0 3 0x14200 aiodoned aiodoned 68030 86273 0 0 3 0x14200 syncer update 16146 271833 0 0 3 0x14200 cleaner cleaner 39900 308778 0 0 3 0x14200 reaper reaper 52643 210083 0 0 3 0x14200 pgdaemon pagedaemon 78201 62526 0 0 3 0x14200 bored crynlk 45277 303604 0 0 3 0x14200 bored crypto 37389 101882 0 0 3 0x40014200 acpi0 acpi0 20247 438475 0 0 3 0x14200 bored softnet 28951 72526 0 0 3 0x14200 bored systqmp 16041 343500 0 0 3 0x14200 bored systq 77927 491684 0 0 3 0x40014200 bored softclock 40112 38970 0 0 3 0x40014200 idle0 1 208554 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 9489 6343K 6358K 78643K 10747 0 0 pcb 23 9K 10K 78643K 399 0 0 rtable 100 3K 3K 78643K 241 0 0 ifaddr 52 12K 12K 78643K 91 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 23 0 0 iov 0 0K 24K 78643K 48 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1209 76K 76K 78643K 1513 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 18 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 0K 78643K 440 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 6 17K 25K 78643K 838 0 0 sigio 0 0K 0K 78643K 20 0 0 proc 42 30K 54K 78643K 382 0 0 subproc 64 65538K 67586K 78643K 86 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 82 0 0 in_multi 33 2K 2K 78643K 66 0 0 ether_multi 1 0K 0K 78643K 3 0 0 mrt 0 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 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 220 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 77 20K 22K 78643K 2705 0 0 UVM aobj 42 2K 2K 78643K 44 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 28 0 0 NDP 10 0K 0K 78643K 24 0 0 temp 144 2340K 2408K 78643K 5298 0 0 kqueue 0 0K 0K 78643K 4 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 280 312 0 305 1 0 1 1 0 8 0 plimitpl 152 21 0 14 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 544 101 0 97 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 9 0 9 5 4 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 185 0 0 12 0 12 12 0 8 0 art_table 32 186 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semapl 112 438 0 428 1 0 1 1 0 8 0 shmpl 112 42 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2998 0 1577 46 0 46 46 0 8 0 ffsino 240 2998 0 1577 84 0 84 84 0 8 0 nchpl 144 4606 0 2980 61 0 61 61 0 8 0 uvmvnodes 72 3091 0 0 57 0 57 57 0 8 0 vnodes 200 3091 0 0 163 0 163 163 0 8 0 namei 1024 13192 0 13192 2 1 1 1 0 8 1 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 12720 0 12720 7 6 1 6 0 8 1 sigapl 432 1007 0 993 2 0 2 2 0 8 0 futexpl 56 15036 0 15035 1 0 1 1 0 8 0 knotepl 112 161 0 134 2 1 1 2 0 8 0 kqueuepl 104 149 0 147 1 0 1 1 0 8 0 pipepl 112 1184 0 1165 3 2 1 2 0 8 0 fdescpl 424 1008 0 993 2 0 2 2 0 8 0 filepl 120 5980 0 5880 5 1 4 4 0 8 0 lockfpl 104 251 0 250 4 3 1 1 0 8 0 lockfspl 32 340 0 339 4 3 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 20 0 10 1 0 1 1 0 8 0 ucredpl 96 1440 0 1433 1 0 1 1 0 8 0 zombiepl 144 993 0 993 2 1 1 1 0 8 1 processpl 840 1022 0 993 5 1 4 4 0 8 0 procpl 600 2113 0 2076 5 1 4 4 0 8 0 sosppl 128 23 0 23 5 4 1 1 0 8 1 sockpl 384 649 0 632 6 3 3 3 0 8 1 mcl64k 65536 10 0 10 4 4 0 1 0 8 0 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 11 0 11 6 6 0 1 0 8 0 mcl9k 9216 11 0 11 6 5 1 1 0 8 1 mcl8k 8192 14 0 14 5 4 1 1 0 8 1 mcl4k 4096 45 0 45 5 4 1 1 0 8 1 mcl2k 2048 43385 0 43350 14 9 5 12 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 73982 0 73927 11 6 5 7 0 8 0 bufpl 256 7690 0 2309 337 0 337 337 0 8 0 anonpl 16 107858 0 100025 55 7 48 49 0 62 13 amapchunkpl 152 4340 0 4258 22 14 8 13 0 158 4 amappl16 192 5394 0 4977 60 31 29 33 0 8 8 amappl15 184 175 0 174 1 0 1 1 0 8 0 amappl14 176 8 0 7 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 456 0 454 2 1 1 1 0 8 0 amappl11 152 550 0 537 1 0 1 1 0 8 0 amappl10 144 56 0 55 2 1 1 1 0 8 0 amappl9 136 317 0 314 1 0 1 1 0 8 0 amappl8 128 136 0 118 1 0 1 1 0 8 0 amappl7 120 38 0 33 1 0 1 1 0 8 0 amappl6 112 50 0 44 1 0 1 1 0 8 0 amappl5 104 200 0 187 1 0 1 1 0 8 0 amappl4 96 268 0 243 2 1 1 2 0 8 0 amappl3 88 602 0 594 1 0 1 1 0 8 0 amappl2 80 9136 0 9074 2 0 2 2 0 8 0 amappl1 72 26106 0 25683 25 15 10 19 0 8 0 amappl 72 2329 0 2296 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 43 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1008 0 993 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1008 0 993 1 0 1 1 0 8 0 vmmpekpl 168 11937 0 11916 2 0 2 2 0 8 0 vmmpepl 168 109498 0 108077 108 34 74 74 0 357 12 vmsppl 264 1007 0 993 2 1 1 2 0 8 0 pdppl 4096 2022 0 1986 6 1 5 6 0 8 0 pvpl 32 337293 0 326396 216 25 191 196 0 265 102 pmappl 192 1007 0 993 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 488 0 32 14 0 14 14 0 8 0