panic: timeout_add: to_ticks (-682549488) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 310255 61404 0 0 0 0 syz-executor.0 *243302 61404 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,d7511f10) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,b820692f,d7511f10,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800020c3dbd0,2,ffff800020b432d8) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800020c3dbd0,2,ffff800020b432d8) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd80773407a0,80085301,ffff800020c3dbd0,2,fffffd807f7c79c0,ffff800020b432d8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8007a5c608,80085301,ffff800020c3dbd0,ffff800020b432d8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b432d8,ffff800020c3dd18,ffff800020c3dd00) at sys_ioctl+0x646 syscall(ffff800020c3ddb0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c3ddb0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,d58121d30d8) at Xsyscall+0x128 end of kernel end trace frame: 0xd5a252ab7f0, 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 (-682549488) < 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,d7511f10) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,b820692f,d7511f10,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800020c3dbd0,2,ffff800020b432d8) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800020c3dbd0,2,ffff800020b432d8) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd80773407a0,80085301,ffff800020c3dbd0,2,fffffd807f7c79c0,ffff800020b432d8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8007a5c608,80085301,ffff800020c3dbd0,ffff800020b432d8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b432d8,ffff800020c3dd18,ffff800020c3dd00) at sys_ioctl+0x646 syscall(ffff800020c3ddb0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c3ddb0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,d58121d30d8) at Xsyscall+0x128 end of kernel end trace frame: 0xd5a252ab7f0, count: -10 ddb{1}> show registers rdi 0xffffffff81af7d57 db_enter+0x17 rsi 0x1109 __ALIGN_SIZE+0x109 rbp 0xffff800020c3d7f0 rbx 0xffff800020c3d8a0 rdx 0x110a __ALIGN_SIZE+0x10a rcx 0xffff800000947000 rax 0xffff800000947000 r8 0xffffffff81e424c3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x1f0b8b917db7d209 r12 0x3000000008 r13 0xffff800020c3d800 r14 0x100 r15 0x1 rip 0xffffffff81af7d58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c3d7e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=243302 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42e28,0xffff800020b42730 process=0xffff800020b449e8 user=0xffff800020c38000, vmspace=0xfffffd807f00d168 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61404 310255 55368 0 7 0 syz-executor.0 61404 309899 55368 0 3 0x4000080 netio syz-executor.0 *61404 243302 55368 0 7 0x4000000 syz-executor.0 61404 21765 55368 0 2 0x4000000 syz-executor.0 96275 75626 1 0 3 0x100083 ttyin getty 55368 282813 46894 0 3 0x82 nanosleep syz-executor.0 60502 1202 0 0 3 0x14200 bored sosplice 6139 336979 46894 0 3 0x82 piperd syz-executor.1 46894 414811 37504 0 3 0x82 thrsleep syz-fuzzer 46894 165394 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 406355 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 24357 37504 0 3 0x4000082 kqread syz-fuzzer 46894 287264 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 489933 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 399407 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 461967 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 356947 37504 0 3 0x4000082 thrsleep syz-fuzzer 46894 140963 37504 0 3 0x4000082 thrsleep syz-fuzzer 37504 237445 11380 0 3 0x10008a pause ksh 11380 237405 22130 0 3 0x92 select sshd 22130 268630 1 0 3 0x80 select sshd 86794 117532 43951 73 3 0x100090 kqread syslogd 43951 18775 1 0 3 0x100082 netio syslogd 54520 84945 1 77 3 0x100090 poll dhclient 17943 273431 1 0 3 0x80 poll dhclient 62683 446056 0 0 3 0x14200 pgzero zerothread 67059 64391 0 0 3 0x14200 aiodoned aiodoned 24351 246420 0 0 3 0x14200 syncer update 28628 37759 0 0 3 0x14200 cleaner cleaner 18834 511615 0 0 3 0x14200 reaper reaper 89981 418354 0 0 3 0x14200 pgdaemon pagedaemon 29699 107304 0 0 3 0x14200 bored crynlk 69619 351997 0 0 3 0x14200 bored crypto 43482 126776 0 0 3 0x40014200 acpi0 acpi0 47831 243422 0 0 3 0x40014200 idle1 46007 305911 0 0 3 0x14200 bored softnet 56824 128100 0 0 3 0x14200 bored systqmp 97239 431852 0 0 3 0x14200 bored systq 93326 52377 0 0 3 0x40014200 bored softclock 67148 403378 0 0 3 0x40014200 idle0 1 438517 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 61404 (syz-executor.0) thread 0xffff800020b432d8 (243302) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82335598) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #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 9505 14537K 14546K 78643K 10874 0 0 pcb 23 9K 10K 78643K 448 0 0 rtable 100 3K 4K 78643K 384 0 0 ifaddr 52 12K 13K 78643K 150 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 23 0 0 iov 1 12K 16K 78643K 99 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1200 75K 76K 78643K 1739 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 15 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 141 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 793 0 0 sigio 0 0K 0K 78643K 17 0 0 proc 41 38K 58K 78643K 425 0 0 subproc 64 65538K 67586K 78643K 136 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 132 0 0 in_multi 33 2K 2K 78643K 104 0 0 ether_multi 1 0K 0K 78643K 5 0 0 mrt 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 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 253 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 87 20K 29K 78643K 3347 0 0 UVM aobj 44 2K 2K 78643K 45 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 20 0 0 NDP 10 0K 0K 78643K 43 0 0 temp 155 2366K 2433K 78643K 5085 0 0 kqueue 0 0K 0K 78643K 3 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 6 0 2 1 0 1 1 0 8 0 inpcbpl 280 431 0 422 1 0 1 1 0 8 0 plimitpl 152 25 0 18 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 59 0 19 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 160 0 156 1 0 1 1 0 8 0 nd6 48 8 0 4 1 0 1 1 0 8 0 ppxss 1128 21 0 21 5 4 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 273 0 85 12 0 12 12 0 8 0 art_table 32 274 0 85 2 0 2 2 0 8 0 art_node 16 58 0 24 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 10 1 0 1 1 0 8 0 semapl 112 139 0 129 1 0 1 1 0 8 0 shmpl 112 43 0 1 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2980 0 1559 46 0 46 46 0 8 0 ffsino 272 2980 0 1559 95 0 95 95 0 8 0 nchpl 144 4332 0 2720 61 0 61 61 0 8 0 uvmvnodes 72 3118 0 0 57 0 57 57 0 8 0 vnodes 200 3118 0 0 165 0 165 165 0 8 0 namei 1024 12609 0 12609 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 1 0 1 0 8 0 scxspl 192 11481 0 11481 11 8 3 6 0 8 3 sigapl 432 958 0 945 2 0 2 2 0 8 0 futexpl 56 9593 0 9593 1 0 1 1 0 8 1 knotepl 112 278 0 251 3 2 1 2 0 8 0 kqueuepl 104 228 0 226 1 0 1 1 0 8 0 pipepl 112 564 0 545 2 1 1 1 0 8 0 fdescpl 488 959 0 945 3 1 2 3 0 8 0 filepl 152 5956 0 5859 6 1 5 5 0 8 0 lockfpl 104 316 0 315 2 1 1 1 0 8 0 lockfspl 32 526 0 525 2 1 1 1 0 8 0 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 36 0 26 1 0 1 1 0 8 0 ucredpl 96 1659 0 1652 1 0 1 1 0 8 0 zombiepl 144 945 0 945 2 1 1 1 0 8 1 processpl 840 974 0 945 4 0 4 4 0 8 0 procpl 600 2694 0 2653 4 0 4 4 0 8 0 srpgc 64 12 0 12 1 0 1 1 0 8 1 sosppl 128 10 0 10 3 3 0 1 0 8 0 sockpl 384 808 0 789 3 0 3 3 0 8 1 mcl64k 65536 231 0 0 29 7 22 29 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 114 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 316 0 0 20 0 20 20 0 8 0 bufpl 256 6856 0 1014 366 0 366 366 0 8 0 anonpl 16 109923 0 103296 69 25 44 49 0 125 11 amapchunkpl 152 6018 0 5921 25 16 9 9 0 158 4 amappl16 192 4905 0 4489 52 24 28 34 0 8 6 amappl15 184 390 0 389 1 0 1 1 0 8 0 amappl14 176 4 0 4 2 2 0 1 0 8 0 amappl13 168 50 0 45 1 0 1 1 0 8 0 amappl12 160 9 0 8 1 0 1 1 0 8 0 amappl11 152 184 0 175 1 0 1 1 0 8 0 amappl10 144 418 0 414 2 1 1 1 0 8 0 amappl9 136 360 0 356 1 0 1 1 0 8 0 amappl8 128 158 0 137 1 0 1 1 0 8 0 amappl7 120 66 0 56 1 0 1 1 0 8 0 amappl6 112 60 0 50 1 0 1 1 0 8 0 amappl5 104 512 0 501 1 0 1 1 0 8 0 amappl4 96 285 0 263 2 1 1 2 0 8 0 amappl3 88 163 0 155 1 0 1 1 0 8 0 amappl2 80 8223 0 8171 2 0 2 2 0 8 0 amappl1 72 29072 0 28649 23 13 10 19 0 8 0 amappl 72 2926 0 2890 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 44 0 1 1 0 1 1 0 8 0 uaddrrnd 24 959 0 945 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 959 0 945 1 0 1 1 0 8 0 vmmpekpl 168 11322 0 11295 2 0 2 2 0 8 0 vmmpepl 168 108192 0 106826 95 21 74 75 0 357 10 vmsppl 360 958 0 945 2 0 2 2 0 8 0 pdppl 4096 1925 0 1890 6 1 5 6 0 8 0 pvpl 32 318263 0 308625 160 42 118 127 0 265 28 pmappl 224 958 0 945 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 554 0 10 16 0 16 16 0 8 0