panic: timeout_add: to_ticks (-3) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *450336 48182 0 0 0x4000000 0 syz-executor.1 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,fffffffd) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,ffffffff,fffffffd,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800014a1aa20,3,ffff8000ffff8e18) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800014a1aa20,3,ffff8000ffff8e18) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd80361142b0,80085301,ffff800014a1aa20,3,fffffd803f7c79c0,ffff8000ffff8e18) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd803acd41f8,80085301,ffff800014a1aa20,ffff8000ffff8e18) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff8e18,ffff800014a1ab68,ffff800014a1ab50) at sys_ioctl+0x62d syscall(ffff800014a1ac00) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,1eda880e010) at Xsyscall+0x128 end of kernel end trace frame: 0x1f086a65310, 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 (-3) < 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,fffffffd) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,ffffffff,fffffffd,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800014a1aa20,3,ffff8000ffff8e18) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800014a1aa20,3,ffff8000ffff8e18) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd80361142b0,80085301,ffff800014a1aa20,3,fffffd803f7c79c0,ffff8000ffff8e18) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd803acd41f8,80085301,ffff800014a1aa20,ffff8000ffff8e18) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff8e18,ffff800014a1ab68,ffff800014a1ab50) at sys_ioctl+0x62d syscall(ffff800014a1ac00) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,1eda880e010) at Xsyscall+0x128 end of kernel end trace frame: 0x1f086a65310, count: -10 ddb> show registers rdi 0xffffffff811af457 db_enter+0x17 rsi 0x106c __ALIGN_SIZE+0x6c rbp 0xffff800014a1a640 rbx 0xffff800014a1a6f0 rdx 0x106d __ALIGN_SIZE+0x6d rcx 0xffff800000938000 rax 0xffff800000938000 r8 0xffff800014a1a600 r9 0x1 r10 0xffff800000923940 r11 0x42d2d437aad5337d r12 0x3000000008 r13 0xffff800014a1a650 r14 0x100 r15 0x1 rip 0xffffffff811af458 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a1a630 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=450336 stat=onproc flags process=0 proc=4000000 pri=72, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff8968,0xffffffff82229600 process=0xffff8000149a3a60 user=0xffff800014a15000, vmspace=0xfffffd803f015000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 48182 415696 77955 0 2 0 syz-executor.1 *48182 450336 77955 0 7 0x4000000 syz-executor.1 87070 513144 1 0 3 0x100083 ttyin getty 23775 49079 0 0 3 0x14200 bored sosplice 19803 515657 29824 0 2 0x2 syz-executor.0 77955 28757 29824 0 3 0x82 nanosleep syz-executor.1 29824 32996 36002 0 3 0x82 thrsleep syz-fuzzer 29824 261789 36002 0 3 0x4000082 nanosleep syz-fuzzer 29824 43623 36002 0 3 0x4000082 thrsleep syz-fuzzer 29824 511403 36002 0 3 0x4000082 thrsleep syz-fuzzer 29824 434805 36002 0 3 0x4000082 thrsleep syz-fuzzer 29824 193459 36002 0 3 0x4000082 kqread syz-fuzzer 29824 123761 36002 0 3 0x4000082 thrsleep syz-fuzzer 36002 246916 26842 0 3 0x10008a pause ksh 26842 495540 83048 0 3 0x92 select sshd 83048 452487 1 0 3 0x80 select sshd 37189 189392 54902 73 3 0x100090 kqread syslogd 54902 514374 1 0 3 0x100082 netio syslogd 20535 367008 1 77 3 0x100090 poll dhclient 10262 194843 1 0 3 0x80 poll dhclient 72403 18729 0 0 2 0x14200 zerothread 37040 51072 0 0 3 0x14200 aiodoned aiodoned 98679 172247 0 0 3 0x14200 syncer update 21838 220265 0 0 3 0x14200 cleaner cleaner 4844 435030 0 0 3 0x14200 reaper reaper 30569 460602 0 0 3 0x14200 pgdaemon pagedaemon 15094 213916 0 0 3 0x14200 bored crynlk 6312 510186 0 0 3 0x14200 bored crypto 90620 509196 0 0 3 0x40014200 acpi0 acpi0 79787 219551 0 0 3 0x14200 bored softnet 50726 475801 0 0 3 0x14200 bored systqmp 64266 350362 0 0 3 0x14200 bored systq 95093 509858 0 0 3 0x40014200 bored softclock 92997 242024 0 0 3 0x40014200 idle0 1 495790 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 9493 6340K 6350K 78643K 10823 0 0 pcb 23 9K 10K 78643K 435 0 0 rtable 100 3K 3K 78643K 281 0 0 ifaddr 51 12K 12K 78643K 112 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 19 0 0 iov 0 0K 16K 78643K 84 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1213 76K 76K 78643K 1682 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 13 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 0K 78643K 70 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 25K 78643K 720 0 0 sigio 0 0K 0K 78643K 2 0 0 proc 41 30K 46K 78643K 348 0 0 subproc 64 65538K 67586K 78643K 88 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 97 0 0 in_multi 33 2K 2K 78643K 55 0 0 ether_multi 1 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 84 371K 371K 78643K 84 0 0 exec 0 0K 1K 78643K 241 0 0 pfkey data 0 0K 0K 78643K 2 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 73 20K 22K 78643K 2467 0 0 UVM aobj 41 2K 2K 78643K 51 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 24 0 0 NDP 10 0K 0K 78643K 30 0 0 temp 156 2347K 2411K 78643K 4745 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 280 346 0 339 1 0 1 1 0 8 0 plimitpl 152 20 0 13 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 544 134 0 130 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 12 0 12 3 3 0 1 0 8 0 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 10 0 6 3 2 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 68 0 58 1 0 1 1 0 8 0 shmpl 112 49 0 10 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2817 0 1407 46 0 46 46 0 8 0 ffsino 240 2817 0 1407 84 0 84 84 0 8 0 nchpl 144 4067 0 2443 61 0 61 61 0 8 0 uvmvnodes 72 2957 0 0 54 0 54 54 0 8 0 vnodes 200 2957 0 0 156 0 156 156 0 8 0 namei 1024 12010 0 12010 3 2 1 1 0 8 1 scxspl 192 12183 0 12183 9 8 1 6 0 8 1 sigapl 432 889 0 876 2 0 2 2 0 8 0 futexpl 56 11890 0 11890 2 1 1 1 0 8 1 knotepl 112 233 0 206 2 1 1 2 0 8 0 kqueuepl 104 217 0 215 1 0 1 1 0 8 0 pipepl 112 522 0 503 3 2 1 2 0 8 0 fdescpl 424 890 0 876 2 0 2 2 0 8 0 filepl 120 5689 0 5594 4 0 4 4 0 8 0 lockfpl 104 300 0 300 3 2 1 1 0 8 1 lockfspl 32 477 0 477 3 2 1 1 0 8 1 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 1646 0 1639 1 0 1 1 0 8 0 zombiepl 144 876 0 876 2 1 1 1 0 8 1 processpl 840 904 0 876 5 1 4 4 0 8 0 procpl 600 1871 0 1836 6 2 4 4 0 8 1 sosppl 128 17 0 17 3 3 0 1 0 8 0 sockpl 384 722 0 705 5 2 3 3 0 8 1 mcl64k 65536 789 0 789 67 35 32 33 0 8 32 mcl16k 16384 4 0 4 3 3 0 1 0 8 0 mcl12k 12288 10 0 10 3 3 0 1 0 8 0 mcl9k 9216 15 0 15 4 3 1 1 0 8 1 mcl8k 8192 16 0 16 4 3 1 1 0 8 1 mcl4k 4096 45 0 45 5 4 1 1 0 8 1 mcl2k2 2112 7 0 7 2 1 1 1 0 8 1 mcl2k 2048 44087 0 44052 12 7 5 9 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 76268 0 76214 39 26 13 21 0 8 7 bufpl 256 6332 0 2099 265 0 265 265 0 8 0 anonpl 16 111180 0 103167 82 33 49 51 0 62 15 amapchunkpl 152 3818 0 3730 19 14 5 14 0 158 1 amappl16 192 5488 0 5071 80 49 31 35 0 8 10 amappl15 184 352 0 349 1 0 1 1 0 8 0 amappl14 176 355 0 353 2 1 1 1 0 8 0 amappl13 168 26 0 23 1 0 1 1 0 8 0 amappl12 160 10 0 10 2 2 0 1 0 8 0 amappl11 152 534 0 523 1 0 1 1 0 8 0 amappl10 144 57 0 55 2 1 1 1 0 8 0 amappl9 136 311 0 308 1 0 1 1 0 8 0 amappl8 128 139 0 119 1 0 1 1 0 8 0 amappl7 120 40 0 34 1 0 1 1 0 8 0 amappl6 112 50 0 44 1 0 1 1 0 8 0 amappl5 104 561 0 548 1 0 1 1 0 8 0 amappl4 96 277 0 254 2 1 1 2 0 8 0 amappl3 88 160 0 154 1 0 1 1 0 8 0 amappl2 80 8016 0 7963 2 0 2 2 0 8 0 amappl1 72 24282 0 23876 26 17 9 19 0 8 0 amappl 72 2087 0 2054 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 50 0 10 1 0 1 1 0 8 0 uaddrrnd 24 890 0 876 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 890 0 876 1 0 1 1 0 8 0 vmmpekpl 168 9834 0 9816 2 0 2 2 0 8 0 vmmpepl 168 100693 0 99357 121 48 73 76 0 357 11 vmsppl 264 889 0 876 2 1 1 2 0 8 0 pdppl 4096 1786 0 1752 6 1 5 6 0 8 0 pvpl 32 324016 0 313077 200 70 130 140 0 265 38 pmappl 192 889 0 876 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 507 0 83 13 0 13 13 0 8 0