panic: timeout_add: to_ticks (-109318850) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 289105 40615 0 0 0 1 syz-executor.1 *223459 28267 0 0 0x4000000 0K syz-executor.0 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,f97bed3e) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,2e4ad5a5,f97bed3e,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c37b80,2,ffff800020b43c38) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c37b80,2,ffff800020b43c38) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd806fa24410,20005302,ffff800020c37b80,2,fffffd807f7c7b40,ffff800020b43c38) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80691bd4d8,20005302,ffff800020c37b80,ffff800020b43c38) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43c38,ffff800020c37cc8,ffff800020c37cb0) at sys_ioctl+0x646 syscall(ffff800020c37d60) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c37d60) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,bd0f39ff010) at Xsyscall+0x128 end of kernel end trace frame: 0xbd321df44c0, 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 (-109318850) < 0 ddb{0}> trace 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,f97bed3e) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,2e4ad5a5,f97bed3e,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c37b80,2,ffff800020b43c38) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c37b80,2,ffff800020b43c38) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd806fa24410,20005302,ffff800020c37b80,2,fffffd807f7c7b40,ffff800020b43c38) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80691bd4d8,20005302,ffff800020c37b80,ffff800020b43c38) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43c38,ffff800020c37cc8,ffff800020c37cb0) at sys_ioctl+0x646 syscall(ffff800020c37d60) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c37d60) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,bd0f39ff010) at Xsyscall+0x128 end of kernel end trace frame: 0xbd321df44c0, count: -10 ddb{0}> show registers rdi 0xffffffff81264217 db_enter+0x17 rsi 0x1a42 __ALIGN_SIZE+0xa42 rbp 0xffff800020c377a0 rbx 0xffff800020c37850 rdx 0x1a43 __ALIGN_SIZE+0xa43 rcx 0xffff800000947000 rax 0xffff800000947000 r8 0xffffffff81316553 kprintf+0x183 r9 0x1 r10 0x25 r11 0xd0daff7d9978e513 r12 0x3000000008 r13 0xffff800020c377b0 r14 0x100 r15 0x1 rip 0xffffffff81264218 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c37790 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=223459 stat=onproc flags process=0 proc=4000000 pri=71, usrpri=71, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42bd0,0xffff800020b42730 process=0xffff800020b44010 user=0xffff800020c32000, vmspace=0xfffffd807f00db40 estcpu=21, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40615 289105 24584 0 7 0 syz-executor.1 28267 230482 57890 0 3 0x80 fsleep syz-executor.0 *28267 223459 57890 0 7 0x4000000 syz-executor.0 2402 58455 1 0 3 0x100083 ttyin getty 80073 441457 0 0 3 0x14200 bored sosplice 24584 230412 3423 0 3 0x82 nanosleep syz-executor.1 57890 192375 3423 0 3 0x82 nanosleep syz-executor.0 3423 202061 28703 0 3 0x82 thrsleep syz-fuzzer 3423 201596 28703 0 3 0x4000082 nanosleep syz-fuzzer 3423 479357 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 512870 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 480766 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 107482 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 519912 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 53807 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 98670 28703 0 3 0x4000082 thrsleep syz-fuzzer 3423 362180 28703 0 3 0x4000082 kqread syz-fuzzer 28703 294485 71871 0 3 0x10008a pause ksh 71871 298585 69409 0 3 0x92 select sshd 69409 188409 1 0 3 0x80 select sshd 87864 87709 38723 73 3 0x100090 kqread syslogd 38723 346516 1 0 3 0x100082 netio syslogd 85147 464516 1 77 3 0x100090 poll dhclient 92696 266187 1 0 3 0x80 poll dhclient 45585 173014 0 0 3 0x14200 pgzero zerothread 35694 224069 0 0 3 0x14200 aiodoned aiodoned 94320 14673 0 0 3 0x14200 syncer update 54425 343555 0 0 3 0x14200 cleaner cleaner 273 355836 0 0 3 0x14200 reaper reaper 86398 27394 0 0 3 0x14200 pgdaemon pagedaemon 89535 341780 0 0 3 0x14200 bored crynlk 98772 215292 0 0 3 0x14200 bored crypto 54643 147257 0 0 3 0x40014200 acpi0 acpi0 30409 217565 0 0 3 0x40014200 idle1 83497 334643 0 0 3 0x14200 bored softnet 90701 33977 0 0 3 0x14200 bored systqmp 66702 491893 0 0 3 0x14200 bored systq 82489 464435 0 0 3 0x40014200 bored softclock 24916 29613 0 0 3 0x40014200 idle0 1 354861 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 28267 (syz-executor.0) thread 0xffff800020b43c38 (223459) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @ /syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/trap.c:161 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9513 6353K 6372K 78643K 11024 0 0 pcb 23 9K 10K 78643K 820 0 0 rtable 100 3K 4K 78643K 353 0 0 ifaddr 53 13K 13K 78643K 162 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 29 0 0 iov 0 0K 24K 78643K 158 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1186 74K 76K 78643K 2167 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 20 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 224 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 1600 0 0 sigio 1 0K 0K 78643K 23 0 0 proc 43 38K 58K 78643K 455 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 214 0 0 in_multi 33 2K 2K 78643K 99 0 0 ether_multi 1 0K 0K 78643K 12 0 0 mrt 0 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 108 477K 477K 78643K 108 0 0 exec 0 0K 1K 78643K 286 0 0 pfkey data 0 0K 4K 78643K 2 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 90 21K 29K 78643K 5990 0 0 UVM aobj 71 3K 3K 78643K 84 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 45 0 0 NDP 10 0K 0K 78643K 42 0 0 temp 156 2367K 3007K 78643K 6932 0 0 kqueue 0 0K 0K 78643K 10 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 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 755 0 748 1 0 1 1 0 8 0 plimitpl 152 42 0 35 1 0 1 1 0 8 0 plcache 128 20 0 0 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 tcpqe 32 16 0 16 1 1 0 1 0 8 0 tcpcb 544 277 0 273 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 23 0 23 12 12 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 29 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 222 0 212 1 0 1 1 0 8 0 shmpl 112 82 0 13 3 1 2 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4478 0 3069 46 0 46 46 0 8 0 ffsino 272 4478 0 3069 95 0 95 95 0 8 0 nchpl 144 6985 0 5361 61 0 61 61 0 8 0 uvmvnodes 72 4667 0 0 85 0 85 85 0 8 0 vnodes 200 4667 0 0 246 0 246 246 0 8 0 namei 1024 20804 0 20804 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 6 0 6 4 4 0 1 0 8 0 scxspl 192 18718 0 18718 17 16 1 6 0 8 1 sigapl 432 1772 0 1758 2 0 2 2 0 8 0 futexpl 56 21043 0 21042 1 0 1 1 0 8 0 knotepl 112 377 0 350 5 4 1 2 0 8 0 kqueuepl 104 477 0 475 1 0 1 1 0 8 0 pipepl 112 1116 0 1097 4 3 1 2 0 8 0 fdescpl 488 1773 0 1758 3 1 2 3 0 8 0 filepl 152 10611 0 10513 12 8 4 5 0 8 0 lockfpl 104 516 0 514 12 11 1 1 0 8 0 lockfspl 32 675 0 673 12 11 1 1 0 8 0 sessionpl 112 21 0 11 1 0 1 1 0 8 0 pgrppl 48 37 0 27 1 0 1 1 0 8 0 ucredpl 96 3071 0 3064 1 0 1 1 0 8 0 zombiepl 144 1758 0 1758 1 0 1 1 0 8 1 processpl 840 1788 0 1758 4 0 4 4 0 8 0 procpl 600 5323 0 5283 4 0 4 4 0 8 0 sosppl 128 11 0 11 4 4 0 1 0 8 0 sockpl 384 1476 0 1459 13 11 2 3 0 8 0 mcl64k 65536 295 0 0 36 29 7 34 0 8 1 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 117 0 0 12 1 11 12 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 370 0 0 21 1 20 21 0 8 0 bufpl 256 8419 0 1447 436 0 436 436 0 8 0 anonpl 16 199900 0 192009 136 102 34 49 0 125 0 amapchunkpl 152 10248 0 10161 31 26 5 9 0 158 0 amappl16 192 9751 0 9331 121 99 22 34 0 8 0 amappl15 184 792 0 789 1 0 1 1 0 8 0 amappl14 176 796 0 793 2 1 1 1 0 8 0 amappl13 168 27 0 24 1 0 1 1 0 8 0 amappl12 160 9 0 9 1 1 0 1 0 8 0 amappl11 152 180 0 171 1 0 1 1 0 8 0 amappl10 144 855 0 851 1 0 1 1 0 8 0 amappl9 136 339 0 336 1 0 1 1 0 8 0 amappl8 128 163 0 136 1 0 1 1 0 8 0 amappl7 120 37 0 32 1 0 1 1 0 8 0 amappl6 112 848 0 838 1 0 1 1 0 8 0 amappl5 104 162 0 151 1 0 1 1 0 8 0 amappl4 96 292 0 273 1 0 1 1 0 8 0 amappl3 88 192 0 186 1 0 1 1 0 8 0 amappl2 80 15797 0 15739 2 0 2 2 0 8 0 amappl1 72 48848 0 48420 24 14 10 19 0 8 0 amappl 72 5550 0 5516 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 83 0 13 2 0 2 2 0 8 0 uaddrrnd 24 1773 0 1758 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1773 0 1758 1 0 1 1 0 8 0 vmmpekpl 168 17639 0 17618 2 0 2 2 0 8 0 vmmpepl 168 194507 0 193059 151 87 64 75 0 357 1 vmsppl 360 1772 0 1758 2 0 2 2 0 8 0 pdppl 4096 3553 0 3516 6 1 5 6 0 8 0 pvpl 32 516177 0 505230 274 176 98 126 0 265 7 pmappl 224 1772 0 1758 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 630 0 34 18 0 18 18 0 8 0