panic: timeout_add: to_ticks (-2) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *396598 47197 0 0x2 0 0K syz-executor0507 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 timeout_add(ffff80000066d060,fffffffe) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,5,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020bb3a60,2,ffff800020b952d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020bb3a60,2,ffff800020b952d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd806dc7a710,20005302,ffff800020bb3a60,2,fffffd807f7c7a80,ffff800020b952d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80703f0390,20005302,ffff800020bb3a60,ffff800020b952d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b952d0,ffff800020bb3ba8,ffff800020bb3b90) at sys_ioctl+0x646 syscall(ffff800020bb3c40) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bb3c40) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,7f7fffff63f8,0,1,7f7fffff6408) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff6390, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic timeout_add: to_ticks (-2) < 0 ddb{0}> trace db_enter() at db_enter+24 panic() at panic+372 timeout_add(ffff80000066d060,fffffffe) at timeout_add+404 pcppi_bell(ffff80000066d000,5,fffffffe,1) at pcppi_bell+672 spkrioctl(1b00,20005302,ffff800020bb3a60,2,ffff800020b952d0) at spkrioctl+560 VOP_IOCTL(fffffd806dc7a710,20005302,ffff800020bb3a60,2,fffffd807f7c7a80,ffff800020b952d0) at VOP_IOCTL+154 vn_ioctl(fffffd80703f0390,20005302,ffff800020bb3a60,ffff800020b952d0) at vn_ioctl+201 sys_ioctl(ffff800020b952d0,ffff800020bb3ba8,ffff800020bb3b90) at sys_ioctl+1606 syscall(ffff800020bb3c40) at syscall+1452 Xsyscall(6,0,7f7fffff63f8,0,1,7f7fffff6408) at Xsyscall+296 end of kernel end trace frame: 0x7f7fffff6390, count: -10 ddb{0}> show registers rdi 0 rsi 1 rbp 18446603336770336384 rbx 18446603336770336560 rdx 18446744071594909614 apollo_pio_rec+41672 rcx 513 rax 1 r8 18446744071580452035 kprintf+387 r9 1 r10 15970477839528242473 r11 12090729506193689815 r12 206158430216 r13 18446603336770336400 r14 256 r15 1 rip 18446744071587636920 db_enter+24 cs 8 rflags 582 rsp 18446603336770336368 ss 16 db_enter+24: addq $8,%rsp ddb{0}> show proc PROC (syz-executor0507) pid=396598 stat=onproc flags process=2 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b94010,0xffffffff8230d660 process=0xffff800020b74018 user=0xffff800020bae000, vmspace=0xfffffd806e953878 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *47197 396598 59337 0 7 0x2 syz-executor0507 59337 235904 34022 0 3 0x10008a pause ksh 34022 392147 21158 0 3 0x92 select sshd 32869 120863 1 0 3 0x100083 ttyin getty 21158 429647 1 0 3 0x80 select sshd 46731 367313 399 73 3 0x100090 kqread syslogd 399 175217 1 0 3 0x100082 netio syslogd 30576 33770 1 77 3 0x100090 poll dhclient 18670 188331 1 0 3 0x80 poll dhclient 7689 281094 0 0 3 0x14200 pgzero zerothread 73873 468641 0 0 3 0x14200 aiodoned aiodoned 24059 140560 0 0 3 0x14200 syncer update 24387 66851 0 0 3 0x14200 cleaner cleaner 31737 483449 0 0 3 0x14200 reaper reaper 67679 468932 0 0 3 0x14200 pgdaemon pagedaemon 94163 465036 0 0 3 0x14200 bored crynlk 44117 137922 0 0 3 0x14200 bored crypto 33139 294209 0 0 3 0x40014200 acpi0 acpi0 42093 4684 0 0 7 0x40014200 idle1 20069 338219 0 0 3 0x14200 bored softnet 63136 213915 0 0 3 0x14200 bored systqmp 56746 262109 0 0 3 0x14200 bored systq 82267 19005 0 0 3 0x40014200 bored softclock 71886 447761 0 0 3 0x40014200 idle0 1 458651 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 47197 (syz-executor0507) thread 0xffff800020b952d0 (396598) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823220c8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+1418 #1 syscall+1151 #2 Xsyscall+296 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9443 6315K 6316K 78643K 10530 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1172 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 40 38K 46K 78643K 207 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 150 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 47 2K 3K 78643K 651 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2347K 2411K 78643K 1695 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 22 0 16 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1383 0 18 45 0 45 45 0 8 0 ffsino 272 1383 0 18 92 0 92 92 0 8 0 nchpl 144 1555 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1392 0 0 26 0 26 26 0 8 0 vnodes 200 1392 0 0 74 0 74 74 0 8 0 namei 1024 3262 0 3262 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2353 0 2353 9 8 1 6 0 8 1 sigapl 432 174 0 164 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 114 0 107 3 2 1 1 0 8 0 fdescpl 488 175 0 164 2 0 2 2 0 8 0 filepl 152 808 0 765 2 0 2 2 0 8 0 lockfpl 104 7 0 6 2 1 1 1 0 8 0 lockfspl 32 4 0 3 2 1 1 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 164 0 164 3 2 1 1 0 8 1 processpl 840 189 0 164 4 0 4 4 0 8 0 procpl 600 189 0 164 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 80 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 99 0 0 6 0 6 6 0 8 0 bufpl 256 1999 0 254 110 0 110 110 0 8 0 anonpl 16 16799 0 15712 6 1 5 6 0 125 0 amapchunkpl 152 487 0 452 2 0 2 2 0 158 0 amappl16 192 71 0 66 1 0 1 1 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 16 0 13 1 0 1 1 0 8 0 amappl12 160 8 0 8 1 1 0 1 0 8 0 amappl11 152 175 0 166 1 0 1 1 0 8 0 amappl10 144 46 0 46 3 2 1 1 0 8 1 amappl9 136 135 0 133 1 0 1 1 0 8 0 amappl8 128 105 0 99 1 0 1 1 0 8 0 amappl7 120 29 0 25 1 0 1 1 0 8 0 amappl6 112 39 0 35 1 0 1 1 0 8 0 amappl5 104 285 0 273 1 0 1 1 0 8 0 amappl4 96 256 0 236 1 0 1 1 0 8 0 amappl3 88 112 0 107 1 0 1 1 0 8 0 amappl2 80 561 0 527 1 0 1 1 0 8 0 amappl1 72 11513 0 11126 15 5 10 15 0 8 0 amappl 72 365 0 346 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 175 0 164 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 175 0 164 1 0 1 1 0 8 0 vmmpekpl 168 5150 0 5132 1 0 1 1 0 8 0 vmmpepl 168 23647 0 22959 54 20 34 43 0 357 3 vmsppl 360 174 0 164 2 0 2 2 0 8 0 pdppl 4096 358 0 328 5 0 5 5 0 8 0 pvpl 32 69285 0 66586 37 11 26 26 0 265 1 pmappl 224 174 0 164 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 239 0 4 7 0 7 7 0 8 0 ddb{0}>