panic: timeout_add: to_ticks (-3) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *102311 12424 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,fffffffd) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,2,fffffffd,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a240e0,2,ffff8000ffff8e18) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a240e0,2,ffff8000ffff8e18) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8039bfc9d8,20005302,ffff800014a240e0,2,fffffd803f7c7a20,ffff8000ffff8e18) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd802ff12a60,20005302,ffff800014a240e0,ffff8000ffff8e18) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff8e18,ffff800014a24228,ffff800014a24210) at sys_ioctl+0x62d syscall(ffff800014a242c0) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,c1925d3e010) at Xsyscall+0x128 end of kernel end trace frame: 0xc1b9a5b9a20, 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+24 panic() at panic+348 timeout_add(ffff800000669260,fffffffd) at timeout_add+377 pcppi_bell(ffff800000669200,2,fffffffd,1) at pcppi_bell+672 spkrioctl(1b00,20005302,ffff800014a240e0,2,ffff8000ffff8e18) at spkrioctl+560 VOP_IOCTL(fffffd8039bfc9d8,20005302,ffff800014a240e0,2,fffffd803f7c7a20,ffff8000ffff8e18) at VOP_IOCTL+154 vn_ioctl(fffffd802ff12a60,20005302,ffff800014a240e0,ffff8000ffff8e18) at vn_ioctl+201 sys_ioctl(ffff8000ffff8e18,ffff800014a24228,ffff800014a24210) at sys_ioctl+1581 syscall(ffff800014a242c0) at syscall+1333 Xsyscall(6,0,ffffffffffffff88,0,3,c1925d3e010) at Xsyscall+296 end of kernel end trace frame: 0xc1b9a5b9a20, count: -10 ddb> show registers rdi 18446744071581504679 db_enter+23 rsi 4159 __ALIGN_SIZE+63 rbp 18446603336567373056 rbx 18446603336567373232 rdx 4160 __ALIGN_SIZE+64 rcx 18446603336266526720 rax 18446603336266526720 r8 18446603336567372992 r9 1 r10 18446603336245553664 r11 8064642738514009104 r12 206158430216 r13 18446603336567373072 r14 256 r15 1 rip 18446744071581504680 db_enter+24 cs 8 rflags 582 rsp 18446603336567373040 ss 16 db_enter+24: addq $8,%rsp ddb> show proc PROC (syz-executor.0) pid=102311 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff84b8,0xffffffff8225bc68 process=0xffff8000149a3a60 user=0xffff800014a1f000, vmspace=0xfffffd803f015a50 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 12424 383496 71152 0 2 0 syz-executor.0 *12424 102311 71152 0 7 0x4000000 syz-executor.0 49770 446975 1 0 3 0x100083 ttyopn getty 56678 297759 0 0 3 0x14200 bored sosplice 71152 49397 67359 0 3 0x82 nanosleep syz-executor.0 78042 96377 67359 0 3 0x2 biowait syz-executor.1 67359 375338 64646 0 3 0x82 thrsleep syz-fuzzer 67359 330901 64646 0 3 0x4000082 nanosleep syz-fuzzer 67359 190385 64646 0 3 0x4000082 thrsleep syz-fuzzer 67359 168700 64646 0 3 0x4000082 thrsleep syz-fuzzer 67359 59679 64646 0 3 0x4000082 kqread syz-fuzzer 67359 411811 64646 0 3 0x4000082 thrsleep syz-fuzzer 67359 103179 64646 0 3 0x4000082 thrsleep syz-fuzzer 64646 219371 95823 0 3 0x10008a pause ksh 95823 46322 72724 0 3 0x92 select sshd 72724 420742 1 0 3 0x80 select sshd 82177 252356 80186 73 3 0x100090 kqread syslogd 80186 225691 1 0 3 0x100082 netio syslogd 63985 143847 1 77 3 0x100090 poll dhclient 55121 233917 1 0 3 0x80 poll dhclient 52423 283421 0 0 2 0x14200 zerothread 73243 53204 0 0 3 0x14200 aiodoned aiodoned 16595 221880 0 0 3 0x14200 syncer update 57875 457146 0 0 3 0x14200 cleaner cleaner 95791 358674 0 0 3 0x14200 reaper reaper 64615 154879 0 0 3 0x14200 pgdaemon pagedaemon 94355 55595 0 0 3 0x14200 bored crynlk 69996 293051 0 0 3 0x14200 bored crypto 57016 184195 0 0 3 0x40014200 acpi0 acpi0 61695 123288 0 0 3 0x14200 bored softnet 57242 85447 0 0 3 0x14200 bored systqmp 36682 286488 0 0 3 0x14200 bored systq 98458 512010 0 0 3 0x40014200 bored softclock 20607 303795 0 0 3 0x40014200 idle0 1 299502 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 9497 6341K 6356K 78643K 11132 0 0 pcb 23 9K 11K 78643K 999 0 0 rtable 100 3K 3K 78643K 398 0 0 ifaddr 53 13K 14K 78643K 190 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 35 0 0 iov 0 0K 20K 78643K 211 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1194 75K 75K 78643K 2234 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 28 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 0K 78643K 184 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 25K 78643K 1700 0 0 sigio 0 0K 0K 78643K 30 0 0 proc 42 30K 46K 78643K 527 0 0 subproc 64 65538K 67586K 78643K 74 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 229 0 0 in_multi 33 2K 2K 78643K 105 0 0 ether_multi 1 0K 0K 78643K 10 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 346 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 83 20K 40K 78643K 4947 0 0 UVM aobj 110 6K 6K 78643K 121 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 46 0 0 NDP 10 0K 0K 78643K 51 0 0 temp 156 2347K 2423K 78643K 7278 0 0 kqueue 0 0K 0K 78643K 17 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 280 827 0 820 1 0 1 1 0 8 0 plimitpl 152 39 0 32 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 544 302 0 298 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 27 0 27 9 8 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 184 0 0 12 0 12 12 0 8 0 art_table 32 185 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 6 1 0 1 1 0 8 0 semapl 112 182 0 172 1 0 1 1 0 8 0 shmpl 112 119 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4671 0 3230 47 0 47 47 0 8 0 ffsino 240 4671 0 3230 85 0 85 85 0 8 0 nchpl 144 7321 0 5700 61 0 61 61 0 8 0 uvmvnodes 72 4862 0 0 89 0 89 89 0 8 0 vnodes 200 4862 0 0 256 0 256 256 0 8 0 namei 1024 22583 0 22582 1 0 1 1 0 8 0 scsiplug 64 3 0 3 1 1 0 1 0 8 0 scxspl 192 21878 0 21877 13 12 1 6 0 8 0 sigapl 432 1871 0 1858 2 0 2 2 0 8 0 futexpl 56 27933 0 27933 1 0 1 1 0 8 1 knotepl 112 433 0 406 6 5 1 2 0 8 0 kqueuepl 104 535 0 533 1 0 1 1 0 8 0 pipepl 112 1260 0 1241 5 4 1 2 0 8 0 fdescpl 424 1872 0 1858 2 0 2 2 0 8 0 filepl 120 12042 0 11947 5 1 4 5 0 8 1 lockfpl 104 741 0 740 3 2 1 1 0 8 0 lockfspl 32 1214 0 1213 3 2 1 1 0 8 0 sessionpl 112 20 0 10 1 0 1 1 0 8 0 pgrppl 48 44 0 34 1 0 1 1 0 8 0 ucredpl 96 3658 0 3651 1 0 1 1 0 8 0 zombiepl 144 1858 0 1858 2 1 1 1 0 8 1 processpl 840 1886 0 1858 5 1 4 4 0 8 0 procpl 600 4288 0 4253 6 2 4 4 0 8 1 sosppl 128 22 0 22 5 5 0 1 0 8 0 sockpl 384 1701 0 1684 4 1 3 4 0 8 1 mcl64k 65536 1589 0 1589 133 112 21 64 0 8 21 mcl16k 16384 2 0 2 2 2 0 1 0 8 0 mcl12k 12288 34 0 34 11 11 0 1 0 8 0 mcl9k 9216 29 0 29 8 8 0 1 0 8 0 mcl8k 8192 33 0 33 13 12 1 1 0 8 1 mcl4k 4096 111 0 111 6 5 1 1 0 8 1 mcl2k2 2112 3 0 3 2 2 0 1 0 8 0 mcl2k 2048 44139 0 44106 12 7 5 10 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 82091 0 82036 86 81 5 36 0 8 0 bufpl 256 9606 0 4223 337 0 337 337 0 8 0 anonpl 16 194702 0 186703 128 79 49 50 0 62 14 amapchunkpl 152 17815 0 17736 158 140 18 96 0 158 14 amappl16 192 11671 0 11245 119 88 31 34 0 8 8 amappl15 184 3 0 1 1 0 1 1 0 8 0 amappl14 176 8 0 7 2 1 1 1 0 8 0 amappl13 168 26 0 23 1 0 1 1 0 8 0 amappl12 160 1 0 1 1 1 0 1 0 8 0 amappl11 152 1006 0 995 1 0 1 1 0 8 0 amappl10 144 57 0 55 1 0 1 1 0 8 0 amappl9 136 22 0 18 1 0 1 1 0 8 0 amappl8 128 151 0 126 1 0 1 1 0 8 0 amappl7 120 43 0 37 1 0 1 1 0 8 0 amappl6 112 50 0 45 1 0 1 1 0 8 0 amappl5 104 806 0 793 1 0 1 1 0 8 0 amappl4 96 1130 0 1106 2 1 1 2 0 8 0 amappl3 88 208 0 203 1 0 1 1 0 8 0 amappl2 80 18263 0 18209 2 0 2 2 0 8 0 amappl1 72 42361 0 41939 25 15 10 19 0 8 0 amappl 72 4525 0 4494 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 64 120 0 11 2 0 2 2 0 8 0 uaddrrnd 24 1872 0 1858 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1872 0 1858 1 0 1 1 0 8 0 vmmpekpl 168 17582 0 17560 2 0 2 2 0 8 0 vmmpepl 168 200003 0 198637 147 76 71 76 0 357 6 vmsppl 264 1871 0 1858 2 1 1 2 0 8 0 pdppl 4096 3750 0 3716 6 1 5 6 0 8 0 pvpl 32 594633 0 583652 247 119 128 186 0 265 35 pmappl 192 1871 0 1858 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 700 0 222 16 0 16 16 0 8 0