panic: timeout_add: to_ticks (-12380359) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *190929 44063 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,ff431739) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,2eb1dd36,ff431739,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a27910,2,ffff8000149f84e8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a27910,2,ffff8000149f84e8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802a880658,20005302,ffff800014a27910,2,fffffd803f7c7c00,ffff8000149f84e8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8030bf63d8,20005302,ffff800014a27910,ffff8000149f84e8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000149f84e8,ffff800014a27a58,ffff800014a27a40) at sys_ioctl+0x62d syscall(ffff800014a27af0) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,d33e56e7010) at Xsyscall+0x128 end of kernel end trace frame: 0xd36a892d130, 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 (-12380359) < 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,ff431739) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,2eb1dd36,ff431739,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a27910,2,ffff8000149f84e8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a27910,2,ffff8000149f84e8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd802a880658,20005302,ffff800014a27910,2,fffffd803f7c7c00,ffff8000149f84e8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8030bf63d8,20005302,ffff800014a27910,ffff8000149f84e8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000149f84e8,ffff800014a27a58,ffff800014a27a40) at sys_ioctl+0x62d syscall(ffff800014a27af0) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,d33e56e7010) at Xsyscall+0x128 end of kernel end trace frame: 0xd36a892d130, count: -10 ddb> show registers rdi 0xffffffff81cd5d17 db_enter+0x17 rsi 0x1717 __ALIGN_SIZE+0x717 rbp 0xffff800014a27530 rbx 0xffff800014a275e0 rdx 0x1718 __ALIGN_SIZE+0x718 rcx 0xffff800000939000 rax 0xffff800000939000 r8 0xffff800014a274f0 r9 0x1 r10 0xffff8000009239c0 r11 0xba0611d85a15fc55 r12 0x3000000008 r13 0xffff800014a27540 r14 0x100 r15 0x1 rip 0xffffffff81cd5d18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a27520 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=190929 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000149f8bf0,0xffff8000149f9a10 process=0xffff8000149c7718 user=0xffff800014a22000, vmspace=0xfffffd803f015c60 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 44063 230794 93777 0 2 0 syz-executor.1 *44063 190929 93777 0 7 0x4000000 syz-executor.1 44063 239115 93777 0 3 0x4000080 bell syz-executor.1 29508 343326 1 0 3 0x100083 ttyin getty 87905 41501 0 0 3 0x14200 bored sosplice 61253 306942 7974 0 3 0x82 piperd syz-executor.0 93777 146501 7974 0 3 0x82 nanosleep syz-executor.1 7974 404498 71975 0 3 0x82 thrsleep syz-fuzzer 7974 217307 71975 0 3 0x4000082 thrsleep syz-fuzzer 7974 513912 71975 0 3 0x4000082 thrsleep syz-fuzzer 7974 253980 71975 0 3 0x4000082 thrsleep syz-fuzzer 7974 45139 71975 0 3 0x4000082 thrsleep syz-fuzzer 7974 287271 71975 0 3 0x4000082 kqread syz-fuzzer 7974 150045 71975 0 3 0x4000082 thrsleep syz-fuzzer 7974 2673 71975 0 3 0x4000082 thrsleep syz-fuzzer 71975 521170 66786 0 3 0x10008a pause ksh 66786 123289 58875 0 3 0x92 select sshd 58875 7898 1 0 3 0x80 select sshd 42437 204262 53754 73 3 0x100090 kqread syslogd 53754 358588 1 0 3 0x100082 netio syslogd 86128 380304 1 77 3 0x100090 poll dhclient 54886 472777 1 0 3 0x80 poll dhclient 57186 44005 0 0 2 0x14200 zerothread 3566 140264 0 0 3 0x14200 aiodoned aiodoned 22572 265233 0 0 3 0x14200 syncer update 92882 469067 0 0 3 0x14200 cleaner cleaner 93562 177343 0 0 3 0x14200 reaper reaper 14260 353004 0 0 3 0x14200 pgdaemon pagedaemon 73311 459131 0 0 3 0x14200 bored crynlk 60222 316496 0 0 3 0x14200 bored crypto 37520 523162 0 0 3 0x40014200 acpi0 acpi0 92944 408997 0 0 3 0x14200 bored softnet 29711 400178 0 0 3 0x14200 bored systqmp 7040 174725 0 0 3 0x14200 bored systq 23612 299387 0 0 3 0x40014200 bored softclock 22203 346756 0 0 3 0x40014200 idle0 1 338258 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 9526 14548K 14576K 78643K 12595 0 0 pcb 23 9K 11K 78643K 3378 0 0 rtable 100 3K 3K 78643K 967 0 0 ifaddr 59 16K 19K 78643K 526 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 71 0 0 iov 0 0K 32K 78643K 853 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1193 75K 76K 78643K 5225 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 83 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 1K 78643K 800 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 25K 78643K 6349 0 0 sigio 0 0K 0K 78643K 119 0 0 proc 42 30K 54K 78643K 1370 0 0 subproc 64 65538K 69634K 78643K 111 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 903 0 0 in_multi 33 2K 2K 78643K 316 0 0 ether_multi 1 0K 0K 78643K 41 0 0 mrt 0 0K 0K 78643K 15 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 120 530K 530K 78643K 120 0 0 exec 0 0K 1K 78643K 868 0 0 pfkey data 0 0K 4K 78643K 12 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 104 22K 39K 78643K 16515 0 0 UVM aobj 130 7K 7K 78643K 142 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 202 0 0 NDP 12 0K 0K 78643K 142 0 0 temp 171 2347K 2421K 78643K 19708 0 0 kqueue 0 0K 0K 78643K 73 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 3109 0 3102 1 0 1 1 0 8 0 plimitpl 152 100 0 93 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 1095 0 1091 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 101 0 101 36 36 0 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 sysvmsgpl 40 18 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 792 0 782 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 13912 0 12387 51 1 50 50 0 8 0 ffsino 240 13912 0 12387 90 0 90 90 0 8 0 nchpl 144 23357 0 21742 61 0 61 61 0 8 0 uvmvnodes 72 6530 0 0 119 0 119 119 0 8 0 vnodes 200 6530 0 0 344 0 344 344 0 8 0 namei 1024 75941 0 75941 3 2 1 1 0 8 1 scsiplug 64 21 0 21 14 14 0 1 0 8 0 scxspl 192 83801 0 83801 40 39 1 6 0 8 1 sigapl 432 6529 0 6516 2 0 2 2 0 8 0 futexpl 56 106684 0 106684 2 1 1 1 0 8 1 knotepl 112 1720 0 1693 2 0 2 2 0 8 0 kqueuepl 104 2066 0 2064 1 0 1 1 0 8 0 pipepl 112 4370 0 4351 12 11 1 2 0 8 0 fdescpl 424 6530 0 6516 2 0 2 2 0 8 0 filepl 120 43346 0 43248 8 4 4 5 0 8 0 lockfpl 104 2486 0 2484 8 7 1 1 0 8 0 lockfspl 32 3556 0 3554 8 7 1 1 0 8 0 sessionpl 112 29 0 19 1 0 1 1 0 8 0 pgrppl 48 86 0 76 1 0 1 1 0 8 0 ucredpl 96 13643 0 13636 1 0 1 1 0 8 0 zombiepl 144 6516 0 6516 2 1 1 1 0 8 1 processpl 840 6544 0 6516 5 1 4 4 0 8 0 procpl 600 15506 0 15469 8 4 4 4 0 8 0 sosppl 128 86 0 86 26 25 1 1 0 8 1 sockpl 384 6074 0 6057 10 7 3 4 0 8 1 mcl64k 65536 3742 0 3742 342 333 9 64 0 8 9 mcl16k 16384 16 0 16 14 14 0 1 0 8 0 mcl12k 12288 143 0 143 40 39 1 1 0 8 1 mcl9k 9216 124 0 124 29 28 1 1 0 8 1 mcl8k 8192 116 0 116 35 34 1 1 0 8 1 mcl4k 4096 309 0 309 23 22 1 1 0 8 1 mcl2k2 2112 46 0 46 29 29 0 1 0 8 0 mcl2k 2048 52999 0 52965 14 9 5 9 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 119889 0 119837 184 178 6 36 0 8 1 bufpl 256 23017 0 16423 413 0 413 413 0 8 0 anonpl 16 698053 0 689694 352 301 51 52 0 62 14 amapchunkpl 152 29388 0 29307 101 96 5 14 0 158 1 amappl16 192 44503 0 44060 376 345 31 36 0 8 8 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 13 0 9 2 1 1 1 0 8 0 amappl13 168 26 0 22 1 0 1 1 0 8 0 amappl12 160 9 0 8 2 1 1 1 0 8 0 amappl11 152 3351 0 3341 1 0 1 1 0 8 0 amappl10 144 72 0 69 1 0 1 1 0 8 0 amappl9 136 3524 0 3518 1 0 1 1 0 8 0 amappl8 128 207 0 168 2 0 2 2 0 8 0 amappl7 120 41 0 35 1 0 1 1 0 8 0 amappl6 112 50 0 45 1 0 1 1 0 8 0 amappl5 104 204 0 193 1 0 1 1 0 8 0 amappl4 96 3515 0 3491 2 1 1 2 0 8 0 amappl3 88 435 0 430 1 0 1 1 0 8 0 amappl2 80 64443 0 64394 2 0 2 2 0 8 0 amappl1 72 125194 0 124778 25 15 10 19 0 8 0 amappl 72 15845 0 15813 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 64 141 0 12 3 0 3 3 0 8 0 uaddrrnd 24 6530 0 6516 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6530 0 6516 1 0 1 1 0 8 0 vmmpekpl 168 50910 0 50889 2 0 2 2 0 8 0 vmmpepl 168 685382 0 683988 293 221 72 77 0 357 4 vmsppl 264 6529 0 6516 2 1 1 2 0 8 0 pdppl 4096 13066 0 13032 6 1 5 6 0 8 0 pvpl 32 2228397 0 2217023 736 587 149 210 0 265 50 pmappl 192 6529 0 6516 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 1143 0 595 22 3 19 19 0 8 0