panic: timeout_add: to_ticks (-2) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *352244 13829 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(ffff800000669200,4000000,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a1b950,2,ffff800014a4b080) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a1b950,2,ffff800014a4b080) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802c4bd248,20005302,ffff800014a1b950,2,fffffd803f7c79c0,ffff800014a4b080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd802fec8cb8,20005302,ffff800014a1b950,ffff800014a4b080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800014a4b080,ffff800014a1ba98,ffff800014a1ba80) at sys_ioctl+0x62d syscall(ffff800014a1bb30) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,891bac0b010) at Xsyscall+0x128 end of kernel end trace frame: 0x8946b6f73b0, 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(ffff800000669200,4000000,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a1b950,2,ffff800014a4b080) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a1b950,2,ffff800014a4b080) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802c4bd248,20005302,ffff800014a1b950,2,fffffd803f7c79c0,ffff800014a4b080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd802fec8cb8,20005302,ffff800014a1b950,ffff800014a4b080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800014a4b080,ffff800014a1ba98,ffff800014a1ba80) at sys_ioctl+0x62d syscall(ffff800014a1bb30) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,891bac0b010) at Xsyscall+0x128 end of kernel end trace frame: 0x8946b6f73b0, count: -10 ddb> show registers rdi 0xffffffff817d3597 db_enter+0x17 rsi 0x1000 __ALIGN_SIZE rbp 0xffff800014a1b570 rbx 0xffff800014a1b620 rdx 0x1001 __ALIGN_SIZE+0x1 rcx 0xffff800000938000 rax 0xffff800000938000 r8 0xffff800014a1b530 r9 0x1 r10 0xffff800000932cc0 r11 0xb34bec2cfe6c8689 r12 0x3000000008 r13 0xffff800014a1b580 r14 0x100 r15 0x1 rip 0xffffffff817d3598 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a1b560 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=352244 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800014a4a720,0xffffffff82218b08 process=0xffff8000149c7718 user=0xffff800014a16000, vmspace=0xfffffd803f014210 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 13829 422577 56109 0 2 0 syz-executor.0 *13829 352244 56109 0 7 0x4000000 syz-executor.0 98988 519457 25693 0 3 0x80 nanosleep syz-executor.1 98988 412967 25693 0 3 0x4000080 netio syz-executor.1 98988 493657 25693 0 3 0x4000080 fsleep syz-executor.1 23629 151033 1 0 3 0x100083 ttyin getty 51449 75648 0 0 3 0x14200 bored sosplice 25693 68968 79989 0 3 0x82 nanosleep syz-executor.1 56109 194585 79989 0 3 0x82 nanosleep syz-executor.0 79989 138167 32655 0 3 0x82 thrsleep syz-fuzzer 79989 466387 32655 0 3 0x4000082 thrsleep syz-fuzzer 79989 370025 32655 0 3 0x4000082 thrsleep syz-fuzzer 79989 40511 32655 0 3 0x4000082 thrsleep syz-fuzzer 79989 175952 32655 0 3 0x4000082 kqread syz-fuzzer 79989 306545 32655 0 3 0x4000082 thrsleep syz-fuzzer 79989 43759 32655 0 3 0x4000082 thrsleep syz-fuzzer 79989 182757 32655 0 3 0x4000082 thrsleep syz-fuzzer 32655 458760 66364 0 3 0x10008a pause ksh 66364 267827 77019 0 3 0x92 select sshd 77019 385728 1 0 3 0x80 select sshd 19656 502967 99902 73 3 0x100090 kqread syslogd 99902 64115 1 0 3 0x100082 netio syslogd 56246 276750 1 77 3 0x100090 poll dhclient 89607 388875 1 0 3 0x80 poll dhclient 65656 258834 0 0 2 0x14200 zerothread 33600 352391 0 0 3 0x14200 aiodoned aiodoned 79815 159177 0 0 3 0x14200 syncer update 45764 262044 0 0 3 0x14200 cleaner cleaner 77152 206099 0 0 3 0x14200 reaper reaper 9365 264197 0 0 3 0x14200 pgdaemon pagedaemon 20419 137111 0 0 3 0x14200 bored crynlk 51172 263139 0 0 3 0x14200 bored crypto 46205 47532 0 0 3 0x40014200 acpi0 acpi0 26772 109057 0 0 3 0x14200 bored softnet 10873 164509 0 0 3 0x14200 bored systqmp 55918 481461 0 0 3 0x14200 bored systq 25682 156977 0 0 3 0x40014200 bored softclock 22618 363123 0 0 3 0x40014200 idle0 1 347846 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 9507 6344K 6367K 78643K 11198 0 0 pcb 23 9K 10K 78643K 1170 0 0 rtable 100 3K 3K 78643K 464 0 0 ifaddr 55 13K 14K 78643K 231 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 31 0 0 iov 0 0K 28K 78643K 237 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1191 75K 75K 78643K 2632 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 39 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 0K 78643K 231 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 6 17K 25K 78643K 2086 0 0 sigio 0 0K 0K 78643K 31 0 0 proc 42 30K 54K 78643K 541 0 0 subproc 64 65538K 69634K 78643K 70 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 238 0 0 in_multi 33 2K 2K 78643K 111 0 0 ether_multi 1 0K 0K 78643K 20 0 0 mrt 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 90 397K 397K 78643K 90 0 0 exec 0 0K 1K 78643K 662 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 96 21K 60K 78643K 5793 0 0 UVM aobj 130 6K 6K 78643K 141 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 39 0 0 NDP 11 0K 0K 78643K 62 0 0 temp 164 2347K 2415K 78643K 8246 0 0 kqueue 0 0K 0K 78643K 12 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 280 930 0 922 1 0 1 1 0 8 0 plimitpl 152 43 0 36 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 544 329 0 325 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 40 0 40 7 7 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 18 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 229 0 219 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5697 0 4253 47 0 47 47 0 8 0 ffsino 240 5697 0 4253 86 0 86 86 0 8 0 nchpl 144 8925 0 7300 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 27643 0 27643 1 0 1 1 0 8 1 scsiplug 64 5 0 5 4 4 0 1 0 8 0 scxspl 192 29372 0 29372 15 14 1 5 0 8 1 sigapl 432 2255 0 2241 2 0 2 2 0 8 0 futexpl 56 34417 0 34416 1 0 1 1 0 8 0 knotepl 112 466 0 439 2 1 1 2 0 8 0 kqueuepl 104 596 0 594 1 0 1 1 0 8 0 pipepl 112 1414 0 1395 4 2 2 2 0 8 1 fdescpl 424 2256 0 2241 2 0 2 2 0 8 0 filepl 120 14452 0 14356 5 1 4 5 0 8 1 lockfpl 104 637 0 636 3 2 1 1 0 8 0 lockfspl 32 890 0 889 3 2 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 50 0 40 1 0 1 1 0 8 0 ucredpl 96 4013 0 4006 1 0 1 1 0 8 0 zombiepl 144 2241 0 2241 1 0 1 1 0 8 1 processpl 840 2270 0 2241 5 1 4 4 0 8 0 procpl 600 5109 0 5070 4 0 4 4 0 8 0 sosppl 128 25 0 25 9 9 0 1 0 8 0 sockpl 384 1951 0 1933 3 0 3 3 0 8 1 mcl64k 65536 565 0 565 73 72 1 64 0 8 1 mcl16k 16384 6 0 6 5 5 0 1 0 8 0 mcl12k 12288 39 0 39 8 7 1 1 0 8 1 mcl9k 9216 32 0 32 13 13 0 1 0 8 0 mcl8k 8192 38 0 38 11 10 1 1 0 8 1 mcl4k 4096 104 0 104 6 5 1 1 0 8 1 mcl2k2 2112 13 0 13 7 7 0 1 0 8 0 mcl2k 2048 44538 0 44504 17 12 5 9 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 82742 0 82673 42 34 8 38 0 8 0 bufpl 256 10723 0 5339 337 0 337 337 0 8 0 anonpl 16 234333 0 226179 112 77 35 50 0 62 0 amapchunkpl 152 14819 0 14735 190 167 23 189 0 158 19 amappl16 192 12218 0 11787 123 100 23 34 0 8 1 amappl15 184 1011 0 1008 1 0 1 1 0 8 0 amappl14 176 2076 0 2070 2 1 1 1 0 8 0 amappl13 168 27 0 24 1 0 1 1 0 8 0 amappl12 160 9 0 7 1 0 1 1 0 8 0 amappl11 152 180 0 171 1 0 1 1 0 8 0 amappl10 144 55 0 54 1 0 1 1 0 8 0 amappl9 136 331 0 327 1 0 1 1 0 8 0 amappl8 128 161 0 131 2 0 2 2 0 8 0 amappl7 120 42 0 37 1 0 1 1 0 8 0 amappl6 112 1110 0 1104 1 0 1 1 0 8 0 amappl5 104 1193 0 1179 1 0 1 1 0 8 0 amappl4 96 287 0 262 2 1 1 2 0 8 0 amappl3 88 210 0 203 1 0 1 1 0 8 0 amappl2 80 21434 0 21375 2 0 2 2 0 8 0 amappl1 72 49874 0 49432 24 14 10 19 0 8 0 amappl 72 5349 0 5315 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 64 140 0 11 3 0 3 3 0 8 0 uaddrrnd 24 2256 0 2241 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2256 0 2241 1 0 1 1 0 8 0 vmmpekpl 168 18591 0 18572 2 0 2 2 0 8 0 vmmpepl 168 241249 0 239779 129 63 66 74 0 357 1 vmsppl 264 2255 0 2241 2 1 1 2 0 8 0 pdppl 4096 4518 0 4482 6 1 5 6 0 8 0 pvpl 32 785225 0 773999 287 134 153 225 0 265 61 pmappl 192 2255 0 2241 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 603 0 141 14 0 14 14 0 8 0