panic: timeout_add: to_ticks (-973078528) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 522908 14904 0 0 0 0 syz-executor.0 *226880 14904 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,c6000000) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,20,c6000000,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800020c2bbc0,2,ffff800020b42720) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800020c2bbc0,2,ffff800020b42720) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd8072695c20,80085301,ffff800020c2bbc0,2,fffffd807f7c7ba0,ffff800020b42720) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806948f870,80085301,ffff800020c2bbc0,ffff800020b42720) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42720,ffff800020c2bd08,ffff800020c2bcf0) at sys_ioctl+0x646 syscall(ffff800020c2bda0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2bda0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,760a09000d8) at Xsyscall+0x128 end of kernel end trace frame: 0x762c39eb670, 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 (-973078528) < 0 ddb{1}> trace db_enter() at db_enter+24 panic() at panic+372 timeout_add(ffff80000066d060,c6000000) at timeout_add+404 pcppi_bell(ffff80000066d000,20,c6000000,1) at pcppi_bell+672 spkrioctl(1b00,80085301,ffff800020c2bbc0,2,ffff800020b42720) at spkrioctl+291 VOP_IOCTL(fffffd8072695c20,80085301,ffff800020c2bbc0,2,fffffd807f7c7ba0,ffff800020b42720) at VOP_IOCTL+154 vn_ioctl(fffffd806948f870,80085301,ffff800020c2bbc0,ffff800020b42720) at vn_ioctl+201 sys_ioctl(ffff800020b42720,ffff800020c2bd08,ffff800020c2bcf0) at sys_ioctl+1606 syscall(ffff800020c2bda0) at syscall+1452 Xsyscall(6,0,ffffffffffffff88,0,3,760a09000d8) at Xsyscall+296 end of kernel end trace frame: 0x762c39eb670, count: -10 ddb{1}> show registers rdi 18446744071587636919 db_enter+23 rsi 4225 __ALIGN_SIZE+129 rbp 18446603336770828256 rbx 18446603336770828432 rdx 4226 __ALIGN_SIZE+130 rcx 18446603336233021440 rax 18446603336233021440 r8 18446744071580452035 kprintf+387 r9 1 r10 37 r11 10960755242944463252 r12 206158430216 r13 18446603336770828272 r14 256 r15 1 rip 18446744071587636920 db_enter+24 cs 8 rflags 582 rsp 18446603336770828240 ss 16 db_enter+24: addq $8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=226880 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42e28,0xffffffff8230d660 process=0xffff800020b45078 user=0xffff800020c26000, vmspace=0xfffffd807efffca8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14904 522908 75533 0 7 0 syz-executor.0 14904 138277 75533 0 2 0x4000080 syz-executor.0 *14904 226880 75533 0 7 0x4000000 syz-executor.0 38171 417994 1 0 3 0x100083 ttyin getty 39008 53785 0 0 3 0x14200 bored sosplice 24226 53219 6802 0 3 0x82 nanosleep syz-executor.1 75533 335662 6802 0 3 0x82 nanosleep syz-executor.0 6802 24850 65357 0 3 0x82 thrsleep syz-fuzzer 6802 69642 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 301134 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 450483 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 423274 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 305825 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 397343 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 227931 65357 0 3 0x4000082 kqread syz-fuzzer 6802 415418 65357 0 3 0x4000082 thrsleep syz-fuzzer 6802 506769 65357 0 3 0x4000082 thrsleep syz-fuzzer 65357 429431 60280 0 3 0x10008a pause ksh 60280 387320 57056 0 3 0x92 select sshd 57056 309130 1 0 3 0x80 select sshd 97781 86289 46597 73 3 0x100090 kqread syslogd 46597 421246 1 0 3 0x100082 netio syslogd 88306 43752 1 77 3 0x100090 poll dhclient 25808 304744 1 0 3 0x80 poll dhclient 35151 479119 0 0 2 0x14200 zerothread 57292 445324 0 0 3 0x14200 aiodoned aiodoned 52708 221281 0 0 3 0x14200 syncer update 57580 454997 0 0 3 0x14200 cleaner cleaner 77588 240844 0 0 3 0x14200 reaper reaper 38940 3968 0 0 3 0x14200 pgdaemon pagedaemon 47479 370700 0 0 3 0x14200 bored crynlk 80449 276129 0 0 3 0x14200 bored crypto 53059 510331 0 0 3 0x40014200 acpi0 acpi0 63778 272999 0 0 3 0x40014200 idle1 55025 10660 0 0 3 0x14200 bored softnet 14880 95745 0 0 3 0x14200 bored systqmp 8939 48656 0 0 3 0x14200 bored systq 61359 152339 0 0 3 0x40014200 bored softclock 94301 434403 0 0 3 0x40014200 idle0 1 238477 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 14904 (syz-executor.0) thread 0xffff800020b42720 (226880) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9494 6348K 6356K 78643K 10849 0 0 pcb 23 9K 10K 78643K 402 0 0 rtable 100 3K 4K 78643K 236 0 0 ifaddr 45 11K 12K 78643K 81 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 21 0 0 iov 0 0K 32K 78643K 39 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 76K 78643K 1668 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 19 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 104 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 720 0 0 sigio 0 0K 0K 78643K 11 0 0 proc 42 38K 58K 78643K 354 0 0 subproc 64 65538K 67586K 78643K 70 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 102 0 0 in_multi 33 2K 2K 78643K 65 0 0 ether_multi 1 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 78 344K 344K 78643K 78 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 83 20K 29K 78643K 3082 0 0 UVM aobj 53 2K 2K 78643K 55 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 11 0 0 NDP 8 0K 0K 78643K 22 0 0 temp 141 2362K 2430K 78643K 4605 0 0 kqueue 0 0K 0K 78643K 10 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 280 329 0 322 1 0 1 1 0 8 0 plimitpl 152 22 0 15 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 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 544 118 0 114 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 4 0 4 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 2 1 0 1 1 0 8 0 semapl 112 100 0 90 1 0 1 1 0 8 0 shmpl 112 53 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2904 0 1497 46 0 46 46 0 8 0 ffsino 272 2904 0 1497 95 0 95 95 0 8 0 nchpl 144 4101 0 2479 61 0 61 61 0 8 0 uvmvnodes 72 3002 0 0 55 0 55 55 0 8 0 vnodes 200 3002 0 0 158 0 158 158 0 8 0 namei 1024 11195 0 11195 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 10903 0 10903 10 9 1 6 0 8 1 sigapl 432 889 0 876 2 0 2 2 0 8 0 futexpl 56 7397 0 7397 1 0 1 1 0 8 1 knotepl 112 184 0 157 2 1 1 2 0 8 0 kqueuepl 104 154 0 152 1 0 1 1 0 8 0 pipepl 112 570 0 551 4 2 2 2 0 8 1 fdescpl 488 890 0 876 3 1 2 3 0 8 0 filepl 152 4952 0 4857 9 4 5 6 0 8 1 lockfpl 104 364 0 363 2 1 1 1 0 8 0 lockfspl 32 460 0 459 2 1 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 33 0 23 1 0 1 1 0 8 0 ucredpl 96 1199 0 1192 1 0 1 1 0 8 0 zombiepl 144 876 0 875 2 1 1 1 0 8 0 processpl 840 905 0 875 4 0 4 4 0 8 0 procpl 600 2491 0 2450 4 0 4 4 0 8 0 sosppl 128 13 0 13 4 3 1 1 0 8 1 sockpl 384 672 0 655 4 1 3 3 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 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 256 142 0 0 8 0 8 8 0 8 0 bufpl 256 6331 0 1017 333 0 333 333 0 8 0 anonpl 16 92762 0 85042 71 36 35 48 0 125 0 amapchunkpl 152 5259 0 5171 21 17 4 11 0 158 0 amappl16 192 4586 0 4175 56 35 21 33 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 5 0 4 2 1 1 1 0 8 0 amappl13 168 418 0 414 1 0 1 1 0 8 0 amappl12 160 9 0 9 1 1 0 1 0 8 0 amappl11 152 177 0 168 1 0 1 1 0 8 0 amappl10 144 61 0 57 1 0 1 1 0 8 0 amappl9 136 332 0 329 1 0 1 1 0 8 0 amappl8 128 137 0 119 1 0 1 1 0 8 0 amappl7 120 40 0 34 1 0 1 1 0 8 0 amappl6 112 58 0 49 1 0 1 1 0 8 0 amappl5 104 164 0 153 1 0 1 1 0 8 0 amappl4 96 977 0 953 2 1 1 2 0 8 0 amappl3 88 145 0 139 1 0 1 1 0 8 0 amappl2 80 7663 0 7610 2 0 2 2 0 8 0 amappl1 72 27253 0 26826 24 14 10 19 0 8 0 amappl 72 2706 0 2672 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 54 0 2 1 0 1 1 0 8 0 uaddrrnd 24 890 0 876 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 890 0 876 1 0 1 1 0 8 0 vmmpekpl 168 11354 0 11334 2 0 2 2 0 8 0 vmmpepl 168 100175 0 98817 102 37 65 74 0 357 1 vmsppl 360 889 0 876 2 0 2 2 0 8 0 pdppl 4096 1788 0 1752 6 1 5 6 0 8 0 pvpl 32 286023 0 275329 157 46 111 128 0 265 20 pmappl 224 889 0 876 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 481 0 3 14 0 14 14 0 8 0