panic: timeout_add: to_ticks (-925952777) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 157362 36915 0 0 0 1 syz-executor.1 *130267 36915 0 0 0x4000000 0K syz-executor.1 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,c8cf14f7) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,9aac7d04,c8cf14f7,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c2f830,2,ffff800020b424c8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c2f830,2,ffff800020b424c8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd807b0964b8,20005302,ffff800020c2f830,2,fffffd807f7c7a80,ffff800020b424c8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671f8020,20005302,ffff800020c2f830,ffff800020b424c8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b424c8,ffff800020c2f978,ffff800020c2f960) at sys_ioctl+0x646 syscall(ffff800020c2fa10) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2fa10) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,d8cf3d93010) at Xsyscall+0x128 end of kernel end trace frame: 0xd8ef4a01550, 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 (-925952777) < 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,c8cf14f7) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,9aac7d04,c8cf14f7,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c2f830,2,ffff800020b424c8) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c2f830,2,ffff800020b424c8) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd807b0964b8,20005302,ffff800020c2f830,2,fffffd807f7c7a80,ffff800020b424c8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671f8020,20005302,ffff800020c2f830,ffff800020b424c8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b424c8,ffff800020c2f978,ffff800020c2f960) at sys_ioctl+0x646 syscall(ffff800020c2fa10) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2fa10) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,d8cf3d93010) at Xsyscall+0x128 end of kernel end trace frame: 0xd8ef4a01550, count: -10 ddb{0}> show registers rdi 0xffffffff813edb17 db_enter+0x17 rsi 0x14cc __ALIGN_SIZE+0x4cc rbp 0xffff800020c2f450 rbx 0xffff800020c2f500 rdx 0x14cd __ALIGN_SIZE+0x4cd rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff81b8cb23 kprintf+0x183 r9 0x1 r10 0x25 r11 0xa747ae13a41921a2 r12 0x3000000008 r13 0xffff800020c2f460 r14 0x100 r15 0x1 rip 0xffffffff813edb18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c2f440 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=130267 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b43530,0xffffffff82353d48 process=0xffff800020b453c0 user=0xffff800020c2a000, vmspace=0xfffffd807effe5a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36915 157362 16475 0 7 0 syz-executor.1 *36915 130267 16475 0 7 0x4000000 syz-executor.1 68721 202952 0 0 3 0x14200 bored sosplice 73870 292166 1 0 3 0x100083 ttyin getty 16475 392689 12799 0 3 0x82 nanosleep syz-executor.1 84279 176100 12799 0 3 0x82 nanosleep syz-executor.0 12799 115523 86947 0 3 0x82 thrsleep syz-fuzzer 12799 103435 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 82933 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 202182 86947 0 3 0x4000082 kqread syz-fuzzer 12799 272313 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 324993 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 452628 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 406618 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 112240 86947 0 3 0x4000082 thrsleep syz-fuzzer 12799 425651 86947 0 3 0x4000082 thrsleep syz-fuzzer 86947 262205 15141 0 3 0x10008a pause ksh 15141 51924 3968 0 3 0x92 select sshd 3968 97571 1 0 3 0x80 select sshd 86821 294347 97018 73 3 0x100090 kqread syslogd 97018 479498 1 0 3 0x100082 netio syslogd 6352 450829 1 77 3 0x100090 poll dhclient 38884 300738 1 0 3 0x80 poll dhclient 96234 49450 0 0 3 0x14200 pgzero zerothread 1084 20852 0 0 3 0x14200 aiodoned aiodoned 8567 166267 0 0 3 0x14200 syncer update 82141 343914 0 0 3 0x14200 cleaner cleaner 41787 390528 0 0 3 0x14200 reaper reaper 4789 66504 0 0 3 0x14200 pgdaemon pagedaemon 20248 15152 0 0 3 0x14200 bored crynlk 12834 403796 0 0 3 0x14200 bored crypto 81335 38453 0 0 3 0x40014200 acpi0 acpi0 8910 312638 0 0 3 0x40014200 idle1 41187 330421 0 0 3 0x14200 bored softnet 43131 95435 0 0 3 0x14200 bored systqmp 11434 434136 0 0 3 0x14200 bored systq 68130 148130 0 0 3 0x40014200 bored softclock 58284 210956 0 0 3 0x40014200 idle0 1 201317 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 36915 (syz-executor.1) thread 0xffff800020b424c8 (130267) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8234cf80) 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 9491 6339K 6362K 78643K 10695 0 0 pcb 23 9K 10K 78643K 264 0 0 rtable 100 3K 4K 78643K 232 0 0 ifaddr 46 11K 12K 78643K 80 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 19 0 0 iov 0 0K 16K 78643K 52 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1200 75K 75K 78643K 1450 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 0K 0K 78643K 58 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 421 0 0 sigio 0 0K 0K 78643K 6 0 0 proc 41 38K 58K 78643K 342 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 51 0 0 in_multi 33 2K 2K 78643K 60 0 0 ether_multi 1 0K 0K 78643K 7 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 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 79 20K 21K 78643K 2110 0 0 UVM aobj 32 2K 2K 78643K 34 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 21 0 0 temp 111 2359K 2424K 78643K 3897 0 0 kqueue 0 0K 0K 78643K 2 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 280 220 0 212 1 0 1 1 0 8 0 plimitpl 152 15 0 8 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 1 0 1 1 1 0 1 0 8 0 tcpcb 544 94 0 89 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 6 0 6 2 2 0 1 0 8 0 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 10 0 4 1 0 1 1 0 8 0 semapl 112 56 0 46 1 0 1 1 0 8 0 shmpl 112 32 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2237 0 822 46 0 46 46 0 8 0 ffsino 272 2237 0 822 95 0 95 95 0 8 0 nchpl 144 3050 0 1427 61 0 61 61 0 8 0 uvmvnodes 72 2312 0 0 43 0 43 43 0 8 0 vnodes 200 2312 0 0 122 0 122 122 0 8 0 namei 1024 8411 0 8411 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 8225 0 8225 13 10 3 6 0 8 3 sigapl 432 590 0 577 2 0 2 2 0 8 0 futexpl 56 4484 0 4484 1 0 1 1 0 8 1 knotepl 112 159 0 132 2 1 1 2 0 8 0 kqueuepl 104 143 0 141 1 0 1 1 0 8 0 pipepl 112 404 0 385 4 2 2 2 0 8 1 fdescpl 488 591 0 577 3 1 2 3 0 8 0 filepl 152 3524 0 3426 6 1 5 5 0 8 1 lockfpl 104 88 0 86 2 1 1 1 0 8 0 lockfspl 32 138 0 136 2 1 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 20 0 10 1 0 1 1 0 8 0 ucredpl 96 823 0 816 1 0 1 1 0 8 0 zombiepl 144 577 0 576 2 1 1 1 0 8 0 processpl 840 606 0 576 4 0 4 4 0 8 0 procpl 600 1524 0 1484 4 0 4 4 0 8 0 sosppl 128 6 0 6 2 2 0 1 0 8 0 sockpl 384 452 0 434 3 0 3 3 0 8 1 mcl64k 65536 512 0 0 64 0 64 64 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 113 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 630 0 0 37 0 37 37 0 8 0 bufpl 256 6005 0 1021 312 0 312 312 0 8 0 anonpl 16 67800 0 59904 53 6 47 49 0 125 13 amapchunkpl 152 3253 0 3167 15 6 9 9 0 158 5 amappl16 192 2840 0 2422 40 13 27 33 0 8 5 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 10 0 7 2 1 1 1 0 8 0 amappl13 168 428 0 422 1 0 1 1 0 8 0 amappl12 160 6 0 4 1 0 1 1 0 8 0 amappl11 152 176 0 167 1 0 1 1 0 8 0 amappl10 144 64 0 59 2 1 1 1 0 8 0 amappl9 136 333 0 329 1 0 1 1 0 8 0 amappl8 128 134 0 118 1 0 1 1 0 8 0 amappl7 120 443 0 435 1 0 1 1 0 8 0 amappl6 112 55 0 47 1 0 1 1 0 8 0 amappl5 104 166 0 155 1 0 1 1 0 8 0 amappl4 96 277 0 252 2 1 1 2 0 8 0 amappl3 88 141 0 136 1 0 1 1 0 8 0 amappl2 80 4653 0 4602 2 0 2 2 0 8 0 amappl1 72 20962 0 20554 24 15 9 19 0 8 0 amappl 72 1731 0 1698 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 33 0 2 1 0 1 1 0 8 0 uaddrrnd 24 591 0 577 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 591 0 577 1 0 1 1 0 8 0 vmmpekpl 168 8699 0 8677 2 0 2 2 0 8 0 vmmpepl 168 69540 0 68191 96 24 72 74 0 357 9 vmsppl 360 590 0 577 2 0 2 2 0 8 0 pdppl 4096 1190 0 1154 6 1 5 6 0 8 0 pvpl 32 215396 0 204531 137 14 123 126 0 265 34 pmappl 224 590 0 577 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 552 0 4 16 0 16 16 0 8 0