panic: timeout_add: to_ticks (-2) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *369149 79262 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,fffffffe) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,fffffffc,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a2d980,2,ffff8000ffff4018) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a2d980,2,ffff8000ffff4018) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80371919f8,20005302,ffff800014a2d980,2,fffffd803f7c7a80,ffff8000ffff4018) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd802feb2d30,20005302,ffff800014a2d980,ffff8000ffff4018) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff4018,ffff800014a2dac8,ffff800014a2dab0) at sys_ioctl+0x62d syscall(ffff800014a2db60) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,8f29209a010) at Xsyscall+0x128 end of kernel end trace frame: 0x8f501667e30, 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,fffffffc,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a2d980,2,ffff8000ffff4018) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a2d980,2,ffff8000ffff4018) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80371919f8,20005302,ffff800014a2d980,2,fffffd803f7c7a80,ffff8000ffff4018) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd802feb2d30,20005302,ffff800014a2d980,ffff8000ffff4018) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff4018,ffff800014a2dac8,ffff800014a2dab0) at sys_ioctl+0x62d syscall(ffff800014a2db60) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,8f29209a010) at Xsyscall+0x128 end of kernel end trace frame: 0x8f501667e30, count: -10 ddb> show registers rdi 0xffffffff815b6c77 db_enter+0x17 rsi 0x10e1 __ALIGN_SIZE+0xe1 rbp 0xffff800014a2d5a0 rbx 0xffff800014a2d650 rdx 0x10e2 __ALIGN_SIZE+0xe2 rcx 0xffff800000938000 rax 0xffff800000938000 r8 0xffff800014a2d560 r9 0x1 r10 0xffff800000932ac0 r11 0x41cab52a6ab2dfda r12 0x3000000008 r13 0xffff800014a2d5b0 r14 0x100 r15 0x1 rip 0xffffffff815b6c78 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a2d590 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=369149 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff4270,0xffffffff8224a130 process=0xffff8000149a2d40 user=0xffff800014a28000, vmspace=0xfffffd803f015c60 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79262 214162 47091 0 2 0 syz-executor.1 *79262 369149 47091 0 7 0x4000000 syz-executor.1 64452 271139 1 0 3 0x100083 ttyin getty 74877 498499 0 0 3 0x14200 bored sosplice 30987 430267 90776 0 3 0x2 biowait syz-executor.0 47091 69532 90776 0 3 0x82 nanosleep syz-executor.1 90776 380792 45646 0 3 0x82 thrsleep syz-fuzzer 90776 110753 45646 0 3 0x4000082 nanosleep syz-fuzzer 90776 283242 45646 0 3 0x4000082 thrsleep syz-fuzzer 90776 130083 45646 0 3 0x4000082 thrsleep syz-fuzzer 90776 72337 45646 0 3 0x4000082 thrsleep syz-fuzzer 90776 291876 45646 0 3 0x4000082 thrsleep syz-fuzzer 90776 2212 45646 0 3 0x4000082 thrsleep syz-fuzzer 90776 54176 45646 0 3 0x4000082 kqread syz-fuzzer 45646 87946 88933 0 3 0x10008a pause ksh 88933 116763 61883 0 3 0x92 select sshd 61883 424308 1 0 3 0x80 select sshd 1560 272003 78007 73 3 0x100090 kqread syslogd 78007 135727 1 0 3 0x100082 netio syslogd 14698 129740 1 77 3 0x100090 poll dhclient 48527 220726 1 0 3 0x80 poll dhclient 41577 447921 0 0 2 0x14200 zerothread 47149 128448 0 0 3 0x14200 aiodoned aiodoned 65792 354350 0 0 3 0x14200 syncer update 57409 439744 0 0 3 0x14200 cleaner cleaner 76499 155573 0 0 3 0x14200 reaper reaper 94817 18099 0 0 3 0x14200 pgdaemon pagedaemon 96087 162264 0 0 3 0x14200 bored crynlk 21095 452848 0 0 3 0x14200 bored crypto 48972 384002 0 0 3 0x40014200 acpi0 acpi0 78488 19905 0 0 3 0x14200 bored softnet 67180 310408 0 0 3 0x14200 bored systqmp 39891 82900 0 0 3 0x14200 bored systq 86853 409187 0 0 3 0x40014200 bored softclock 47354 119129 0 0 3 0x40014200 idle0 1 346198 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 9480 6340K 6359K 78643K 10832 0 0 pcb 23 9K 10K 78643K 503 0 0 rtable 100 3K 3K 78643K 303 0 0 ifaddr 47 12K 12K 78643K 131 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 19 0 0 iov 0 0K 16K 78643K 102 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1187 74K 75K 78643K 1733 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 10 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 1K 1K 78643K 92 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 25K 78643K 782 0 0 sigio 0 0K 0K 78643K 20 0 0 proc 41 30K 46K 78643K 359 0 0 subproc 64 65538K 69634K 78643K 68 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 105 0 0 in_multi 33 2K 2K 78643K 69 0 0 ether_multi 1 0K 0K 78643K 9 0 0 mrt 0 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 252 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 79 20K 22K 78643K 2680 0 0 UVM aobj 40 4K 4K 78643K 43 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 30 0 0 NDP 8 0K 0K 78643K 33 0 0 temp 136 2345K 2409K 78643K 4894 0 0 kqueue 0 0K 0K 78643K 3 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 280 406 0 399 1 0 1 1 0 8 0 plimitpl 152 26 0 19 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 544 144 0 140 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 20 0 20 6 5 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 14 0 9 1 0 1 1 0 8 0 semapl 112 90 0 80 1 0 1 1 0 8 0 shmpl 112 41 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3014 0 1614 46 0 46 46 0 8 0 ffsino 240 3014 0 1614 84 1 83 84 0 8 0 nchpl 144 4334 0 2710 61 0 61 61 0 8 0 uvmvnodes 72 3112 0 0 57 0 57 57 0 8 0 vnodes 200 3112 0 0 164 0 164 164 0 8 0 namei 1024 12745 0 12744 3 2 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 14536 0 14535 11 10 1 6 0 8 0 sigapl 432 952 0 939 2 0 2 2 0 8 0 futexpl 56 13157 0 13157 2 1 1 1 0 8 1 knotepl 112 257 0 230 2 1 1 2 0 8 0 kqueuepl 104 258 0 256 1 0 1 1 0 8 0 pipepl 112 644 0 625 4 3 1 2 0 8 0 fdescpl 424 953 0 939 2 0 2 2 0 8 0 filepl 120 6338 0 6243 5 1 4 5 0 8 1 lockfpl 104 311 0 310 3 2 1 1 0 8 0 lockfspl 32 345 0 344 3 2 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 31 0 21 1 0 1 1 0 8 0 ucredpl 96 1861 0 1854 1 0 1 1 0 8 0 zombiepl 144 939 0 939 2 1 1 1 0 8 1 processpl 840 967 0 939 5 1 4 4 0 8 0 procpl 600 2076 0 2040 4 0 4 4 0 8 0 sosppl 128 10 0 10 4 4 0 1 0 8 0 sockpl 384 832 0 815 4 1 3 3 0 8 1 mcl64k 65536 31 0 31 5 4 1 1 0 8 1 mcl16k 16384 3 0 3 2 2 0 1 0 8 0 mcl12k 12288 25 0 25 4 3 1 1 0 8 1 mcl9k 9216 7 0 7 5 4 1 1 0 8 1 mcl8k 8192 19 0 19 5 5 0 1 0 8 0 mcl4k 4096 46 0 46 4 3 1 1 0 8 1 mcl2k2 2112 6 0 6 4 3 1 1 0 8 1 mcl2k 2048 43951 0 43916 13 7 6 11 0 8 1 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 75862 0 75791 7 1 6 6 0 8 0 bufpl 256 9746 0 3217 409 0 409 409 0 8 0 anonpl 16 107534 0 99498 86 37 49 50 0 62 12 amapchunkpl 152 4639 0 4560 24 20 4 14 0 158 0 amappl16 192 4851 0 4422 64 32 32 34 0 8 8 amappl15 184 394 0 391 1 0 1 1 0 8 0 amappl14 176 400 0 394 2 1 1 1 0 8 0 amappl13 168 397 0 393 1 0 1 1 0 8 0 amappl12 160 4 0 4 1 1 0 1 0 8 0 amappl11 152 177 0 168 1 0 1 1 0 8 0 amappl10 144 63 0 61 2 1 1 1 0 8 0 amappl9 136 328 0 324 1 0 1 1 0 8 0 amappl8 128 138 0 120 1 0 1 1 0 8 0 amappl7 120 408 0 403 1 0 1 1 0 8 0 amappl6 112 447 0 437 1 0 1 1 0 8 0 amappl5 104 188 0 178 1 0 1 1 0 8 0 amappl4 96 274 0 253 1 0 1 1 0 8 0 amappl3 88 164 0 159 1 0 1 1 0 8 0 amappl2 80 7896 0 7847 2 0 2 2 0 8 0 amappl1 72 26834 0 26423 24 15 9 19 0 8 0 amappl 72 2287 0 2256 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 42 0 3 1 0 1 1 0 8 0 uaddrrnd 24 953 0 939 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 953 0 939 1 0 1 1 0 8 0 vmmpekpl 168 10012 0 9991 2 0 2 2 0 8 0 vmmpepl 168 107254 0 105909 101 31 70 70 0 357 3 vmsppl 264 952 0 939 2 1 1 2 0 8 0 pdppl 4096 1912 0 1878 6 1 5 6 0 8 0 pvpl 32 417097 0 406088 241 88 153 206 0 265 58 pmappl 192 952 0 939 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 557 0 28 16 0 16 16 0 8 0