panic: timeout_add: to_ticks (-1494657078) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 23621 79559 0 0 0x4000000 1K 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,a6e957ca) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,50c0c736,a6e957ca,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c4ba20,2,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c4ba20,2,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8075466138,20005302,ffff800020c4ba20,2,fffffd807f7c79c0,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806702da38,20005302,ffff800020c4ba20,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c4bb68,ffff800020c4bb50) at sys_ioctl+0x646 syscall(ffff800020c4bc00) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c4bc00) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,1bfcfa44010) at Xsyscall+0x128 end of kernel end trace frame: 0x1c28a6f9240, 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 (-1494657078) < 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,a6e957ca) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,50c0c736,a6e957ca,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c4ba20,2,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c4ba20,2,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8075466138,20005302,ffff800020c4ba20,2,fffffd807f7c79c0,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806702da38,20005302,ffff800020c4ba20,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c4bb68,ffff800020c4bb50) at sys_ioctl+0x646 syscall(ffff800020c4bc00) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c4bc00) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,1bfcfa44010) at Xsyscall+0x128 end of kernel end trace frame: 0x1c28a6f9240, count: -10 ddb{1}> show registers rdi 0xffffffff812c7447 db_enter+0x17 rsi 0x171c __ALIGN_SIZE+0x71c rbp 0xffff800020c4b640 rbx 0xffff800020c4b6f0 rdx 0x171d __ALIGN_SIZE+0x71d rcx 0xffff800002b49000 rax 0xffff800002b49000 r8 0xffffffff8155ffb3 kprintf+0x183 r9 0x1 r10 0x25 r11 0xe00882faa27fec1b r12 0x3000000008 r13 0xffff800020c4b650 r14 0x100 r15 0x1 rip 0xffffffff812c7448 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c4b630 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=23621 stat=onproc flags process=0 proc=4000000 pri=68, usrpri=68, nice=20 forw=0xffffffffffffffff, list=0xffff800020b43080,0xffffffff8233fe30 process=0xffff800020b44d30 user=0xffff800020c46000, vmspace=0xfffffd807efff5a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79559 301401 88983 0 3 0x80 fsleep syz-executor.1 *79559 23621 88983 0 7 0x4000000 syz-executor.1 72927 223388 84560 0 3 0x80 fsleep syz-executor.0 72927 476848 84560 0 3 0x4000080 ttyin syz-executor.0 97468 48037 0 0 3 0x14200 bored sosplice 88983 203439 21413 0 3 0x82 nanosleep syz-executor.1 84560 155541 21413 0 3 0x82 nanosleep syz-executor.0 21413 365876 18590 0 3 0x82 kqread syz-fuzzer 21413 382409 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 470698 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 228220 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 240934 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 80732 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 361557 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 422534 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 146462 18590 0 3 0x4000082 thrsleep syz-fuzzer 21413 363450 18590 0 3 0x4000082 thrsleep syz-fuzzer 18590 401677 782 0 3 0x10008a pause ksh 782 82988 95250 0 3 0x92 select sshd 56411 335142 1 0 3 0x100083 ttyin getty 95250 61678 1 0 3 0x80 select sshd 37892 147247 7899 73 3 0x100090 kqread syslogd 7899 59485 1 0 3 0x100082 netio syslogd 12222 40625 1 77 3 0x100090 poll dhclient 16834 409877 1 0 3 0x80 poll dhclient 14546 337965 0 0 3 0x14200 pgzero zerothread 63599 144993 0 0 3 0x14200 aiodoned aiodoned 3154 63916 0 0 3 0x14200 syncer update 54573 171744 0 0 3 0x14200 cleaner cleaner 47626 22346 0 0 3 0x14200 reaper reaper 76455 344181 0 0 3 0x14200 pgdaemon pagedaemon 58080 174414 0 0 3 0x14200 bored crynlk 78372 130342 0 0 3 0x14200 bored crypto 9722 387061 0 0 3 0x40014200 acpi0 acpi0 71768 148446 0 0 3 0x40014200 idle1 73013 267786 0 0 3 0x14200 bored softnet 48878 505307 0 0 3 0x14200 bored systqmp 48575 303231 0 0 3 0x14200 bored systq 26560 232657 0 0 3 0x40014200 bored softclock 59685 50903 0 0 7 0x40014200 idle0 1 296031 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 79559 (syz-executor.1) thread 0xffff800020b439e0 (23621) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8230eba0) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9489 14534K 14542K 78643K 10725 0 0 pcb 23 9K 10K 78643K 234 0 0 rtable 100 3K 4K 78643K 244 0 0 ifaddr 46 11K 12K 78643K 88 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 16K 78643K 24 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1194 75K 75K 78643K 1407 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 7 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 24 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 311 0 0 sigio 0 0K 0K 78643K 6 0 0 proc 42 38K 58K 78643K 293 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 25 0 0 in_multi 33 2K 2K 78643K 43 0 0 ether_multi 1 0K 0K 78643K 3 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 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 211 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 29K 78643K 1737 0 0 UVM aobj 8 2K 2K 78643K 11 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 1 0 0 NDP 8 0K 0K 78643K 23 0 0 temp 131 2364K 2428K 78643K 3665 0 0 kqueue 0 0K 0K 78643K 1 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 280 142 0 135 1 0 1 1 0 8 0 plimitpl 152 17 0 10 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 55 0 51 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 7 0 7 2 1 1 1 0 8 1 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 14 0 5 1 0 1 1 0 8 0 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 9 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2013 0 609 46 0 46 46 0 8 0 ffsino 272 2013 0 609 95 0 95 95 0 8 0 nchpl 144 2637 0 1012 61 0 61 61 0 8 0 uvmvnodes 72 2101 0 0 39 0 39 39 0 8 0 vnodes 200 2101 0 0 111 0 111 111 0 8 0 namei 1024 7118 0 7118 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 0 1 1 0 8 1 scxspl 192 6325 0 6325 7 6 1 6 0 8 1 sigapl 432 479 0 465 2 0 2 2 0 8 0 futexpl 56 4003 0 4001 1 0 1 1 0 8 0 knotepl 112 177 0 150 3 1 2 2 0 8 1 kqueuepl 104 125 0 123 1 0 1 1 0 8 0 pipepl 112 326 0 307 3 2 1 2 0 8 0 fdescpl 488 480 0 465 3 1 2 3 0 8 0 filepl 152 2872 0 2772 8 3 5 6 0 8 1 lockfpl 104 106 0 104 3 2 1 1 0 8 0 lockfspl 32 212 0 210 3 2 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 26 0 16 1 0 1 1 0 8 0 ucredpl 96 659 0 652 1 0 1 1 0 8 0 zombiepl 144 465 0 465 2 1 1 1 0 8 1 processpl 840 495 0 465 4 0 4 4 0 8 0 procpl 600 1159 0 1118 4 0 4 4 0 8 0 sosppl 128 3 0 3 2 1 1 1 0 8 1 sockpl 384 348 0 331 3 0 3 3 0 8 1 mcl64k 65536 229 0 0 29 1 28 29 0 8 1 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 117 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 328 0 0 20 0 20 20 0 8 0 bufpl 256 5588 0 1013 286 0 286 286 0 8 0 anonpl 16 55665 0 47895 57 10 47 48 0 125 15 amapchunkpl 152 2537 0 2448 10 6 4 9 0 158 0 amappl16 192 2158 0 1753 36 9 27 32 0 8 6 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 7 0 6 2 1 1 1 0 8 0 amappl13 168 31 0 26 1 0 1 1 0 8 0 amappl12 160 159 0 156 1 0 1 1 0 8 0 amappl11 152 182 0 172 1 0 1 1 0 8 0 amappl10 144 342 0 335 1 0 1 1 0 8 0 amappl9 136 357 0 354 1 0 1 1 0 8 0 amappl8 128 286 0 264 1 0 1 1 0 8 0 amappl7 120 39 0 33 1 0 1 1 0 8 0 amappl6 112 56 0 48 1 0 1 1 0 8 0 amappl5 104 111 0 100 1 0 1 1 0 8 0 amappl4 96 268 0 245 2 1 1 2 0 8 0 amappl3 88 142 0 136 1 0 1 1 0 8 0 amappl2 80 3560 0 3499 2 0 2 2 0 8 0 amappl1 72 18664 0 18234 23 13 10 19 0 8 0 amappl 72 1367 0 1332 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 10 0 3 1 0 1 1 0 8 0 uaddrrnd 24 480 0 465 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 480 0 465 1 0 1 1 0 8 0 vmmpekpl 168 7725 0 7703 2 0 2 2 0 8 0 vmmpepl 168 56849 0 55422 86 18 68 70 0 357 5 vmsppl 360 479 0 465 2 0 2 2 0 8 0 pdppl 4096 968 0 930 6 1 5 6 0 8 0 pvpl 32 178382 0 167573 137 14 123 124 0 265 35 pmappl 224 479 0 465 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 473 0 5 14 0 14 14 0 8 0