panic: timeout_add: to_ticks (-2090896839) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *449625 69248 0 0x1000 0x4080000 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(ffff800000669260,835f7239) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,ed40950b,835f7239,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a1e9f0,2,ffff8000ffff9070) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a1e9f0,2,ffff8000ffff9070) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd803c6610e8,20005302,ffff800014a1e9f0,2,fffffd803f7c7ae0,ffff8000ffff9070) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80361d8e18,20005302,ffff800014a1e9f0,ffff8000ffff9070) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff9070,ffff800014a1eb38,ffff800014a1eb20) at sys_ioctl+0x62d syscall(ffff800014a1ebd0) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,deabdfd4010) at Xsyscall+0x128 end of kernel end trace frame: 0xded312b4fe0, 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 (-2090896839) < 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(ffff800000669260,835f7239) at timeout_add+0x179 sys/kern/kern_timeout.c:190 pcppi_bell(ffff800000669200,ed40950b,835f7239,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800014a1e9f0,2,ffff8000ffff9070) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800014a1e9f0,2,ffff8000ffff9070) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd803c6610e8,20005302,ffff800014a1e9f0,2,fffffd803f7c7ae0,ffff8000ffff9070) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80361d8e18,20005302,ffff800014a1e9f0,ffff8000ffff9070) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff9070,ffff800014a1eb38,ffff800014a1eb20) at sys_ioctl+0x62d syscall(ffff800014a1ebd0) at syscall+0x535 Xsyscall(6,0,ffffffffffffff88,0,3,deabdfd4010) at Xsyscall+0x128 end of kernel end trace frame: 0xded312b4fe0, count: -10 ddb> show registers rdi 0xffffffff81cd5d17 db_enter+0x17 rsi 0x15b4 __ALIGN_SIZE+0x5b4 rbp 0xffff800014a1e610 rbx 0xffff800014a1e6c0 rdx 0x15b5 __ALIGN_SIZE+0x5b5 rcx 0xffff800002b39000 rax 0xffff800002b39000 r8 0xffff800014a1e5d0 r9 0x1 r10 0xffff800001b38bc0 r11 0x770dc9f97f7e1b33 r12 0x3000000008 r13 0xffff800014a1e620 r14 0x100 r15 0x1 rip 0xffffffff81cd5d18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a1e600 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=449625 stat=onproc flags process=1000 proc=4080000 pri=21, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff8bc0,0xffff80001495d538 process=0xffff8000149a26b0 user=0xffff800014a19000, vmspace=0xfffffd803f015840 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 69248 355233 56020 0 3 0x3000 suspend syz-executor.0 *69248 449625 56020 0 7 0x4081000 syz-executor.0 69248 356117 56020 0 2 0x4081080 syz-executor.0 14082 444285 1 0 3 0x80 nanosleep init 77296 61255 0 0 3 0x14200 bored sosplice 56020 325025 442 0 3 0x82 nanosleep syz-executor.0 27109 504959 442 0 3 0x2 biowait syz-executor.1 442 387030 25352 0 3 0x82 thrsleep syz-fuzzer 442 409011 25352 0 3 0x4000082 nanosleep syz-fuzzer 442 474702 25352 0 3 0x4000082 thrsleep syz-fuzzer 442 273705 25352 0 3 0x4000082 thrsleep syz-fuzzer 442 220216 25352 0 3 0x4000082 thrsleep syz-fuzzer 442 474681 25352 0 3 0x4000082 kqread syz-fuzzer 442 290284 25352 0 3 0x4000082 thrsleep syz-fuzzer 25352 187834 98505 0 3 0x10008a pause ksh 98505 440399 12640 0 3 0x92 select sshd 12640 104554 1 0 3 0x80 select sshd 45233 119162 64426 73 3 0x100090 kqread syslogd 64426 263803 1 0 3 0x100082 netio syslogd 98444 81776 1 77 3 0x100090 poll dhclient 61316 432401 1 0 3 0x80 poll dhclient 25698 873 0 0 2 0x14200 zerothread 67637 468 0 0 3 0x14200 aiodoned aiodoned 44763 408105 0 0 3 0x14200 syncer update 92278 22490 0 0 3 0x14200 cleaner cleaner 43331 225721 0 0 3 0x14200 reaper reaper 56807 37152 0 0 3 0x14200 pgdaemon pagedaemon 14368 386682 0 0 3 0x14200 bored crynlk 84030 302029 0 0 3 0x14200 bored crypto 42992 509998 0 0 3 0x40014200 acpi0 acpi0 4026 272041 0 0 3 0x14200 bored softnet 83465 247874 0 0 3 0x14200 bored systqmp 52202 93719 0 0 3 0x14200 bored systq 19743 358482 0 0 3 0x40014200 bored softclock 62540 444867 0 0 3 0x40014200 idle0 1 198463 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 9489 6335K 6348K 78643K 10737 0 0 pcb 27 9K 10K 78643K 335 0 0 rtable 100 3K 3K 78643K 218 0 0 ifaddr 51 12K 12K 78643K 76 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 24K 78643K 57 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 75K 78643K 1492 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 4 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 1K 78643K 42 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1777 193K 286K 78643K 12501 0 0 file desc 5 13K 21K 78643K 444 0 0 sigio 0 0K 0K 78643K 8 0 0 proc 35 22K 46K 78643K 307 0 0 subproc 64 65538K 67586K 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 41 0 0 in_multi 33 2K 2K 78643K 48 0 0 ether_multi 1 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 204 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 21K 78643K 1835 0 0 UVM aobj 38 2K 3K 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 8 0 0 NDP 10 0K 0K 78643K 20 0 0 temp 126 2335K 2400K 78643K 3919 0 0 kqueue 0 0K 0K 78643K 2 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 280 210 0 203 1 0 1 1 0 8 0 plimitpl 152 20 0 14 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 60 0 56 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 5 0 5 3 2 1 1 0 8 1 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 4 0 0 1 0 1 1 0 8 0 semapl 112 38 0 28 1 0 1 1 0 8 0 shmpl 112 41 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2277 0 868 46 0 46 46 0 8 0 ffsino 240 2277 0 868 83 0 83 83 0 8 0 nchpl 144 3110 0 1483 61 0 61 61 0 8 0 uvmvnodes 72 2369 0 0 44 0 44 44 0 8 0 vnodes 200 2369 0 0 125 0 125 125 0 8 0 namei 1024 8865 0 8865 2 1 1 1 0 8 1 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 10528 0 10527 9 7 2 6 0 8 1 sigapl 432 614 0 601 2 0 2 2 0 8 0 futexpl 56 6985 0 6984 1 0 1 1 0 8 0 knotepl 112 133 0 106 2 1 1 2 0 8 0 kqueuepl 104 106 0 104 1 0 1 1 0 8 0 pipepl 112 346 0 327 3 2 1 2 0 8 0 fdescpl 424 615 0 601 2 0 2 2 0 8 0 filepl 120 3758 0 3652 4 0 4 4 0 8 0 lockfpl 104 191 0 186 3 2 1 1 0 8 0 lockfspl 32 170 0 167 3 2 1 1 0 8 0 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 24 0 15 1 0 1 1 0 8 0 ucredpl 96 987 0 980 1 0 1 1 0 8 0 zombiepl 144 601 0 601 2 1 1 1 0 8 1 processpl 840 629 0 601 5 1 4 4 0 8 0 procpl 600 1234 0 1198 4 0 4 4 0 8 1 sosppl 128 5 0 5 3 3 0 1 0 8 0 sockpl 384 488 0 467 3 0 3 3 0 8 0 mcl64k 65536 275 0 275 34 33 1 33 0 8 1 mcl16k 16384 4 0 4 3 3 0 1 0 8 0 mcl12k 12288 7 0 7 3 2 1 1 0 8 1 mcl9k 9216 3 0 3 2 2 0 1 0 8 0 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 28 0 28 3 2 1 1 0 8 1 mcl2k2 2112 6 0 6 3 3 0 1 0 8 0 mcl2k 2048 43360 0 43326 14 9 5 12 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 73200 0 73132 22 15 7 21 0 8 0 bufpl 256 6078 0 1824 267 0 267 267 0 8 0 anonpl 16 80873 0 73031 72 23 49 49 0 62 16 amapchunkpl 152 2572 0 2491 6 2 4 5 0 158 0 amappl16 192 3662 0 3244 65 36 29 33 0 8 7 amappl15 184 216 0 214 1 0 1 1 0 8 0 amappl14 176 220 0 217 2 1 1 1 0 8 0 amappl13 168 24 0 21 1 0 1 1 0 8 0 amappl12 160 219 0 217 2 1 1 1 0 8 0 amappl11 152 183 0 173 1 0 1 1 0 8 0 amappl10 144 58 0 55 2 1 1 1 0 8 0 amappl9 136 337 0 332 1 0 1 1 0 8 0 amappl8 128 344 0 326 1 0 1 1 0 8 0 amappl7 120 41 0 35 1 0 1 1 0 8 0 amappl6 112 48 0 43 1 0 1 1 0 8 0 amappl5 104 377 0 364 1 0 1 1 0 8 0 amappl4 96 272 0 253 1 0 1 1 0 8 0 amappl3 88 141 0 136 1 0 1 1 0 8 0 amappl2 80 4876 0 4829 2 0 2 2 0 8 0 amappl1 72 20033 0 19635 24 14 10 19 0 8 0 amappl 72 1466 0 1434 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 5 1 0 1 1 0 8 0 uaddrrnd 24 615 0 601 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 615 0 601 1 0 1 1 0 8 0 vmmpekpl 168 8446 0 8426 2 0 2 2 0 8 0 vmmpepl 168 74961 0 73642 99 29 70 75 0 357 8 vmsppl 264 614 0 601 2 1 1 2 0 8 0 pdppl 4096 1236 0 1202 5 0 5 5 0 8 0 pvpl 32 264711 0 254083 151 30 121 130 0 265 32 pmappl 192 614 0 601 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 453 0 65 13 0 13 13 0 8 0