login: panic: timeout_add: to_ticks (-2) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 465333 53833 0 0 0 1 syz-executor.1 *350130 53833 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,fffffffe) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,10001,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c78e10,2,ffff800020b43080) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c78e10,2,ffff800020b43080) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd806e80a038,20005302,ffff800020c78e10,2,fffffd807f7c7ae0,ffff800020b43080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069352ef0,20005302,ffff800020c78e10,ffff800020b43080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43080,ffff800020c78f58,ffff800020c78f40) at sys_ioctl+0x646 syscall(ffff800020c78ff0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c78ff0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,829cf0d8010) at Xsyscall+0x128 end of kernel end trace frame: 0x82bdc2232c0, 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 (-2) < 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,fffffffe) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,10001,fffffffe,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c78e10,2,ffff800020b43080) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c78e10,2,ffff800020b43080) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd806e80a038,20005302,ffff800020c78e10,2,fffffd807f7c7ae0,ffff800020b43080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069352ef0,20005302,ffff800020c78e10,ffff800020b43080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43080,ffff800020c78f58,ffff800020c78f40) at sys_ioctl+0x646 syscall(ffff800020c78ff0) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c78ff0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,829cf0d8010) at Xsyscall+0x128 end of kernel end trace frame: 0x82bdc2232c0, count: -10 ddb{0}> show registers rdi 0xffffffff81af7d57 db_enter+0x17 rsi 0xd68 rbp 0xffff800020c78a30 rbx 0xffff800020c78ae0 rdx 0xd69 rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff81e424c3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x99f2e2cafb5b89e1 r12 0x3000000008 r13 0xffff800020c78a40 r14 0x100 r15 0x1 rip 0xffffffff81af7d58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c78a20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=350130 stat=onproc flags process=0 proc=4000000 pri=75, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff800020b432d8,0xffffffff8233b768 process=0xffff800020b45078 user=0xffff800020c74000, vmspace=0xfffffd807f00d9d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 53833 465333 49028 0 7 0 syz-executor.1 *53833 350130 49028 0 7 0x4000000 syz-executor.1 14539 463782 6416 0 3 0x80 nanosleep syz-executor.0 14539 240313 6416 0 3 0x4000080 fsleep syz-executor.0 14539 287158 6416 0 3 0x4000080 pipewr syz-executor.0 23496 420987 1 0 3 0x100083 ttyin getty 64013 339991 0 0 3 0x14200 bored sosplice 49028 75990 13442 0 3 0x82 nanosleep syz-executor.1 6416 508252 13442 0 3 0x82 nanosleep syz-executor.0 13442 117258 11045 0 3 0x82 thrsleep syz-fuzzer 13442 35052 11045 0 3 0x4000082 nanosleep syz-fuzzer 13442 29886 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 489324 11045 0 3 0x4000082 kqread syz-fuzzer 13442 416089 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 75592 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 350581 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 66833 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 280349 11045 0 3 0x4000082 thrsleep syz-fuzzer 13442 63199 11045 0 3 0x4000082 thrsleep syz-fuzzer 11045 143915 30426 0 3 0x10008a pause ksh 30426 381436 50549 0 3 0x92 select sshd 50549 415572 1 0 3 0x80 select sshd 29013 248132 24063 73 3 0x100090 kqread syslogd 24063 99320 1 0 3 0x100082 netio syslogd 70213 270004 1 77 3 0x100090 poll dhclient 6888 217557 1 0 3 0x80 poll dhclient 41968 149651 0 0 3 0x14200 pgzero zerothread 54043 107023 0 0 3 0x14200 aiodoned aiodoned 81899 211347 0 0 3 0x14200 syncer update 65438 81684 0 0 3 0x14200 cleaner cleaner 94707 513568 0 0 3 0x14200 reaper reaper 52831 264886 0 0 3 0x14200 pgdaemon pagedaemon 13311 310604 0 0 3 0x14200 bored crynlk 65494 43879 0 0 3 0x14200 bored crypto 82896 297300 0 0 3 0x40014200 acpi0 acpi0 49520 45736 0 0 3 0x40014200 idle1 48740 152669 0 0 3 0x14200 bored softnet 51835 230613 0 0 3 0x14200 bored systqmp 47815 499657 0 0 3 0x14200 bored systq 99617 133863 0 0 3 0x40014200 bored softclock 94679 288071 0 0 3 0x40014200 idle0 1 109535 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 53833 (syz-executor.1) thread 0xffff800020b43080 (350130) 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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9529 14549K 14573K 78643K 11764 0 0 pcb 23 9K 11K 78643K 1807 0 0 rtable 100 3K 4K 78643K 821 0 0 ifaddr 56 14K 15K 78643K 442 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 44 0 0 iov 0 0K 24K 78643K 319 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 76K 78643K 3570 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 52 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 415 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 21K 78643K 3507 0 0 sigio 0 0K 0K 78643K 44 0 0 proc 45 50K 58K 78643K 821 0 0 subproc 64 65538K 67586K 78643K 104 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 484 0 0 in_multi 33 2K 2K 78643K 163 0 0 ether_multi 1 0K 0K 78643K 21 0 0 mrt 1 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 120 530K 530K 78643K 120 0 0 exec 0 0K 1K 78643K 450 0 0 pfkey data 0 0K 4K 78643K 4 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 113 22K 31K 78643K 12038 0 0 UVM aobj 130 4K 4K 78643K 145 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 88 0 0 NDP 11 0K 0K 78643K 119 0 0 temp 163 2367K 2439K 78643K 12143 0 0 kqueue 0 0K 0K 78643K 38 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 1645 0 1638 1 0 1 1 0 8 0 plimitpl 152 47 0 40 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 544 598 0 594 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 90 0 90 9 8 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 22 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 411 0 401 1 0 1 1 0 8 0 shmpl 112 143 0 15 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 8655 0 7207 47 0 47 47 0 8 0 ffsino 272 8655 0 7207 97 0 97 97 0 8 0 nchpl 144 13889 0 12272 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 42096 0 42096 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 11 0 11 8 8 0 1 0 8 0 scxspl 192 41276 0 41276 23 20 3 6 0 8 3 sigapl 432 3680 0 3666 2 0 2 2 0 8 0 futexpl 56 39749 0 39748 1 0 1 1 0 8 0 knotepl 112 823 0 796 8 7 1 2 0 8 0 kqueuepl 104 941 0 937 1 0 1 1 0 8 0 pipepl 112 2064 0 2039 7 6 1 2 0 8 0 fdescpl 488 3681 0 3666 3 1 2 3 0 8 0 filepl 152 22357 0 22254 11 6 5 6 0 8 1 lockfpl 104 1270 0 1269 5 4 1 1 0 8 0 lockfspl 32 1736 0 1735 5 4 1 1 0 8 0 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 49 0 39 1 0 1 1 0 8 0 ucredpl 96 6231 0 6224 1 0 1 1 0 8 0 zombiepl 144 3666 0 3666 2 1 1 1 0 8 1 processpl 840 3696 0 3666 4 0 4 4 0 8 0 procpl 600 11259 0 11217 4 0 4 4 0 8 0 sosppl 128 56 0 56 12 12 0 1 0 8 0 sockpl 384 3229 0 3212 6 3 3 4 0 8 1 mcl64k 65536 318 0 0 38 27 11 33 0 8 1 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 19 0 0 2 0 2 2 0 8 0 mcl9k 9216 16 0 0 2 0 2 2 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 20 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 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 256 598 0 0 28 0 28 28 0 8 0 bufpl 256 12155 0 5183 436 0 436 436 0 8 0 anonpl 16 374214 0 366070 160 114 46 50 0 125 10 amapchunkpl 152 21516 0 21412 47 42 5 10 0 158 0 amappl16 192 18595 0 18179 138 113 25 33 0 8 4 amappl15 184 1701 0 1696 1 0 1 1 0 8 0 amappl14 176 1702 0 1698 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 1807 0 1803 2 1 1 1 0 8 0 amappl11 152 179 0 170 1 0 1 1 0 8 0 amappl10 144 61 0 61 7 7 0 1 0 8 0 amappl9 136 359 0 356 1 0 1 1 0 8 0 amappl8 128 1988 0 1945 2 0 2 2 0 8 0 amappl7 120 37 0 32 1 0 1 1 0 8 0 amappl6 112 1748 0 1739 1 0 1 1 0 8 0 amappl5 104 147 0 136 1 0 1 1 0 8 0 amappl4 96 325 0 304 1 0 1 1 0 8 0 amappl3 88 403 0 397 1 0 1 1 0 8 0 amappl2 80 33874 0 33817 2 0 2 2 0 8 0 amappl1 72 89209 0 88769 24 14 10 19 0 8 0 amappl 72 11512 0 11473 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 64 144 0 15 3 0 3 3 0 8 0 uaddrrnd 24 3681 0 3666 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3681 0 3666 1 0 1 1 0 8 0 vmmpekpl 168 31510 0 31488 2 0 2 2 0 8 0 vmmpepl 168 393593 0 392114 164 93 71 76 0 357 5 vmsppl 360 3680 0 3666 2 0 2 2 0 8 0 pdppl 4096 7369 0 7332 5 0 5 5 0 8 0 pvpl 32 1009587 0 998311 289 165 124 135 0 265 31 pmappl 224 3680 0 3666 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 644 0 30 18 0 18 18 0 8 0