panic: timeout_add: to_ticks (-822417388) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 221552 82916 0 0 0 0 syz-executor.0 *167002 82916 0 0 0x4000000 1K 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,cefae814) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,25bdd93,cefae814,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c22eb0,2,ffff800020b432d8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c22eb0,2,ffff800020b432d8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8071b7f688,20005302,ffff800020c22eb0,2,fffffd807f7c7a80,ffff800020b432d8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067245d30,20005302,ffff800020c22eb0,ffff800020b432d8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b432d8,ffff800020c22ff8,ffff800020c22fe0) at sys_ioctl+0x646 syscall(ffff800020c23090) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c23090) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,5c48d096010) at Xsyscall+0x128 end of kernel end trace frame: 0x5c751a33900, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic timeout_add: to_ticks (-822417388) < 0 ddb{1}> 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,cefae814) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,25bdd93,cefae814,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c22eb0,2,ffff800020b432d8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c22eb0,2,ffff800020b432d8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8071b7f688,20005302,ffff800020c22eb0,2,fffffd807f7c7a80,ffff800020b432d8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067245d30,20005302,ffff800020c22eb0,ffff800020b432d8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b432d8,ffff800020c22ff8,ffff800020c22fe0) at sys_ioctl+0x646 syscall(ffff800020c23090) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c23090) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,5c48d096010) at Xsyscall+0x128 end of kernel end trace frame: 0x5c751a33900, count: -10 ddb{1}> show registers rdi 0xffffffff816f6437 db_enter+0x17 rsi 0x17ec __ALIGN_SIZE+0x7ec rbp 0xffff800020c22ad0 rbx 0xffff800020c22b80 rdx 0x17ed __ALIGN_SIZE+0x7ed rcx 0xffff800000947000 rax 0xffff800000947000 r8 0xffffffff81555b63 kprintf+0x183 r9 0x1 r10 0x25 r11 0x4d2dc63f955d902d r12 0x3000000008 r13 0xffff800020c22ae0 r14 0x100 r15 0x1 rip 0xffffffff816f6438 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c22ac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=167002 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=70, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42978,0xffff800020b42028 process=0xffff800020b449e8 user=0xffff800020c1e000, vmspace=0xfffffd807f00cb40 estcpu=20, cpticks=1, pctcpu=0.1 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82916 221552 63442 0 7 0 syz-executor.0 *82916 167002 63442 0 7 0x4000000 syz-executor.0 82916 113950 63442 0 3 0x4000080 bell syz-executor.0 82916 458246 63442 0 3 0x4000080 fsleep syz-executor.0 98711 382487 0 0 3 0x14200 bored sosplice 82971 90325 99691 0 3 0x82 piperd syz-executor.1 63442 177413 99691 0 3 0x82 nanosleep syz-executor.0 99691 41190 44663 0 3 0x82 thrsleep syz-fuzzer 99691 163858 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 413549 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 13627 44663 0 3 0x4000082 kqread syz-fuzzer 99691 289936 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 185647 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 11015 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 485357 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 392669 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 256082 44663 0 3 0x4000082 thrsleep syz-fuzzer 99691 360610 44663 0 3 0x4000082 thrsleep syz-fuzzer 44663 18721 42924 0 3 0x10008a pause ksh 42924 131210 79073 0 3 0x92 select sshd 97520 519911 1 0 3 0x100083 ttyin getty 79073 329872 1 0 3 0x80 select sshd 42664 104371 89110 73 3 0x100090 kqread syslogd 89110 175026 1 0 3 0x100082 netio syslogd 40075 235290 1 77 3 0x100090 poll dhclient 1117 513677 1 0 3 0x80 poll dhclient 53911 447464 0 0 3 0x14200 pgzero zerothread 29542 190805 0 0 3 0x14200 aiodoned aiodoned 2502 155914 0 0 3 0x14200 syncer update 81829 261053 0 0 3 0x14200 cleaner cleaner 78276 343284 0 0 3 0x14200 reaper reaper 22605 94249 0 0 3 0x14200 pgdaemon pagedaemon 44161 83985 0 0 3 0x14200 bored crynlk 87572 12058 0 0 3 0x14200 bored crypto 44970 343241 0 0 3 0x40014200 acpi0 acpi0 60555 341092 0 0 3 0x40014200 idle1 28057 226637 0 0 3 0x14200 bored softnet 13986 98028 0 0 3 0x14200 bored systqmp 77874 137067 0 0 3 0x14200 bored systq 49298 155122 0 0 3 0x40014200 bored softclock 6421 126270 0 0 3 0x40014200 idle0 1 238976 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 82916 (syz-executor.0) thread 0xffff800020b432d8 (167002) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823174f8) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231 #2 mi_switch+0x3b0 sys/kern/sched_bsd.c:436 #3 sleep_finish+0x110 sys/kern/kern_synch.c:312 #4 sleep_finish_all+0x34 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline] #4 sleep_finish_all+0x34 sys/kern/kern_synch.c:157 #5 tsleep+0x1bc #6 pcppi_bell+0x37e sys/dev/isa/pcppi.c:237 #7 spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] #7 spkrioctl+0x230 sys/dev/isa/spkr.c:503 #8 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #9 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #10 sys_ioctl+0x646 #11 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #11 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #12 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9488 6338K 6354K 78643K 10659 0 0 pcb 23 9K 10K 78643K 183 0 0 rtable 100 3K 4K 78643K 195 0 0 ifaddr 45 11K 11K 78643K 58 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 16K 78643K 23 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1203 75K 75K 78643K 1360 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 6 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 30 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 289 0 0 sigio 0 0K 0K 78643K 12 0 0 proc 42 38K 70K 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 37 0 0 in_multi 33 2K 2K 78643K 39 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 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 188 0 0 pfkey data 0 0K 0K 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 80 20K 29K 78643K 1667 0 0 UVM aobj 12 2K 2K 78643K 17 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 14 0 0 NDP 8 0K 0K 78643K 15 0 0 temp 133 2364K 2428K 78643K 3519 0 0 kqueue 0 0K 0K 78643K 2 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> 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 280 182 0 175 1 0 1 1 0 8 0 plimitpl 152 19 0 12 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 tcpcb 544 78 0 74 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 3 0 3 1 0 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 3 1 0 1 1 0 8 0 semapl 112 28 0 18 1 0 1 1 0 8 0 shmpl 112 15 0 5 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1951 0 537 46 0 46 46 0 8 0 ffsino 272 1951 0 537 95 0 95 95 0 8 0 nchpl 144 2588 0 965 61 0 61 61 0 8 0 uvmvnodes 72 2018 0 0 37 0 37 37 0 8 0 vnodes 200 2018 0 0 107 0 107 107 0 8 0 namei 1024 6699 0 6699 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 6517 0 6517 7 6 1 6 0 8 1 sigapl 432 457 0 444 2 0 2 2 0 8 0 futexpl 56 3085 0 3084 1 0 1 1 0 8 0 knotepl 112 117 0 90 2 1 1 2 0 8 0 kqueuepl 104 98 0 96 1 0 1 1 0 8 0 pipepl 112 284 0 265 2 0 2 2 0 8 1 fdescpl 488 458 0 444 3 1 2 3 0 8 0 filepl 152 2551 0 2452 6 1 5 5 0 8 1 lockfpl 104 120 0 117 2 1 1 1 0 8 0 lockfspl 32 215 0 212 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 22 0 12 1 0 1 1 0 8 0 ucredpl 96 481 0 474 1 0 1 1 0 8 0 zombiepl 144 444 0 444 1 0 1 1 0 8 1 processpl 840 473 0 444 4 0 4 4 0 8 0 procpl 600 1094 0 1052 4 0 4 4 0 8 0 sosppl 128 6 0 6 2 1 1 1 0 8 1 sockpl 384 324 0 307 3 0 3 3 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 109 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 135 0 0 8 0 8 8 0 8 0 bufpl 256 5777 0 1015 298 0 298 298 0 8 0 anonpl 16 47230 0 39515 40 8 32 39 0 125 0 amapchunkpl 152 2346 0 2259 9 5 4 9 0 158 0 amappl16 192 1671 0 1260 21 0 21 21 0 8 0 amappl15 184 3 0 2 2 1 1 1 0 8 0 amappl14 176 10 0 8 2 1 1 1 0 8 0 amappl13 168 30 0 26 1 0 1 1 0 8 0 amappl12 160 5 0 5 1 1 0 1 0 8 0 amappl11 152 316 0 307 1 0 1 1 0 8 0 amappl10 144 325 0 319 1 0 1 1 0 8 0 amappl9 136 342 0 338 1 0 1 1 0 8 0 amappl8 128 133 0 114 1 0 1 1 0 8 0 amappl7 120 40 0 34 1 0 1 1 0 8 0 amappl6 112 57 0 49 1 0 1 1 0 8 0 amappl5 104 420 0 409 1 0 1 1 0 8 0 amappl4 96 272 0 247 2 1 1 2 0 8 0 amappl3 88 137 0 132 1 0 1 1 0 8 0 amappl2 80 3331 0 3276 2 0 2 2 0 8 0 amappl1 72 18236 0 17829 24 14 10 19 0 8 0 amappl 72 1298 0 1264 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 16 0 5 1 0 1 1 0 8 0 uaddrrnd 24 458 0 444 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 458 0 444 1 0 1 1 0 8 0 vmmpekpl 168 7515 0 7494 2 0 2 2 0 8 0 vmmpepl 168 54723 0 53379 79 15 64 70 0 357 1 vmsppl 360 457 0 444 2 0 2 2 0 8 0 pdppl 4096 923 0 888 6 1 5 6 0 8 0 pvpl 32 161701 0 151001 111 12 99 106 0 265 11 pmappl 224 457 0 444 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 444 0 3 13 0 13 13 0 8 0