panic: timeout_add: to_ticks (-1) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 471633 71984 0 0 0 0 syz-executor.1 *239853 71984 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,ffffffff) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,2,ffffffff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c1d570,2,ffff800020b259d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c1d570,2,ffff800020b259d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80766028c8,20005302,ffff800020c1d570,2,fffffd807f7c7840,ffff800020b259d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8076639578,20005302,ffff800020c1d570,ffff800020b259d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b259d0,ffff800020c1d6b8,ffff800020c1d6a0) at sys_ioctl+0x646 syscall(ffff800020c1d750) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c1d750) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,b1cda227010) at Xsyscall+0x128 end of kernel end trace frame: 0xb1fb4217730, 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 (-1) < 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,ffffffff) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,2,ffffffff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c1d570,2,ffff800020b259d0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c1d570,2,ffff800020b259d0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80766028c8,20005302,ffff800020c1d570,2,fffffd807f7c7840,ffff800020b259d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8076639578,20005302,ffff800020c1d570,ffff800020b259d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b259d0,ffff800020c1d6b8,ffff800020c1d6a0) at sys_ioctl+0x646 syscall(ffff800020c1d750) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c1d750) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,b1cda227010) at Xsyscall+0x128 end of kernel end trace frame: 0xb1fb4217730, count: -10 ddb{1}> show registers rdi 0xffffffff8125d7b7 db_enter+0x17 rsi 0x1108 __ALIGN_SIZE+0x108 rbp 0xffff800020c1d190 rbx 0xffff800020c1d240 rdx 0x1109 __ALIGN_SIZE+0x109 rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff811d6983 kprintf+0x183 r9 0x1 r10 0x25 r11 0x7e7cb93ae6aa0f0a r12 0x3000000008 r13 0xffff800020c1d1a0 r14 0x100 r15 0x1 rip 0xffffffff8125d7b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c1d180 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=239853 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020b95078,0xffffffff82310f08 process=0xffff800020b45708 user=0xffff800020c18000, vmspace=0xfffffd807f00cb40 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71984 471633 34828 0 7 0 syz-executor.1 *71984 239853 34828 0 7 0x4000000 syz-executor.1 34828 349770 67278 0 3 0x82 nanosleep syz-executor.1 50756 140433 67278 0 3 0x2 biowait syz-executor.0 67278 142339 9201 0 3 0x82 thrsleep syz-fuzzer 67278 219698 9201 0 2 0x4000482 syz-fuzzer 67278 149689 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 14561 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 54137 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 64109 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 199888 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 283595 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 175227 9201 0 3 0x4000082 thrsleep syz-fuzzer 67278 306569 9201 0 3 0x4000082 kqread syz-fuzzer 9201 441287 98079 0 3 0x10008a pause ksh 98079 171243 53210 0 3 0x92 select sshd 71774 136063 1 0 3 0x100083 ttyin getty 53210 298917 1 0 3 0x80 select sshd 8215 66716 94229 73 3 0x100090 kqread syslogd 94229 425022 1 0 3 0x100082 netio syslogd 35917 504060 1 77 3 0x100090 poll dhclient 56337 151188 1 0 3 0x80 poll dhclient 23163 176652 0 0 3 0x14200 pgzero zerothread 9256 245238 0 0 3 0x14200 aiodoned aiodoned 24559 387396 0 0 3 0x14200 syncer update 68680 313899 0 0 3 0x14200 cleaner cleaner 14788 467313 0 0 3 0x14200 reaper reaper 92931 407092 0 0 3 0x14200 pgdaemon pagedaemon 59098 159345 0 0 3 0x14200 bored crynlk 39796 5599 0 0 3 0x14200 bored crypto 23870 176519 0 0 3 0x40014200 acpi0 acpi0 38903 416927 0 0 3 0x40014200 idle1 77672 402170 0 0 3 0x14200 bored softnet 58462 264207 0 0 3 0x14200 bored systqmp 7629 33103 0 0 3 0x14200 bored systq 99319 375253 0 0 3 0x40014200 bored softclock 50883 144667 0 0 3 0x40014200 idle0 1 504278 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 71984 (syz-executor.1) thread 0xffff800020b259d0 (239853) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82330470) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231 #2 mi_switch+0x3b0 sys/kern/sched_bsd.c:436 #3 sleep_finish+0x110 sys/kern/kern_synch.c:312 #4 sleep_finish_all+0x34 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline] #4 sleep_finish_all+0x34 sys/kern/kern_synch.c:157 #5 tsleep+0x1bc #6 spkrioctl+0x261 rest sys/dev/isa/spkr.c:106 [inline] #6 spkrioctl+0x261 sys/dev/isa/spkr.c:501 #7 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #8 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #9 sys_ioctl+0x646 #10 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #10 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #11 Xsyscall+0x128 Process 50756 (syz-executor.0) thread 0xffff800020b24968 (140433) exclusive rrwlock inode r = 0 (0xfffffd80764bdf80) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 ufs_ihashins+0x67 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13d sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0x10f sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0x76 sys/kern/vfs_vops.c:445 #8 domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 #9 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a1f96f8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:598 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #8 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9457 6321K 6322K 78643K 10548 0 0 pcb 23 9K 9K 78643K 59 0 0 rtable 100 3K 4K 78643K 176 0 0 ifaddr 35 10K 10K 78643K 39 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 12K 78643K 6 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1199 75K 75K 78643K 1212 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 4 0K 0K 78643K 4 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 32 0 0 proc 41 38K 70K 78643K 253 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 in_multi 33 2K 2K 78643K 33 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 42 185K 185K 78643K 42 0 0 exec 0 0K 1K 78643K 165 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 74 20K 20K 78643K 829 0 0 UVM aobj 4 2K 2K 78643K 4 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 5 0K 0K 78643K 10 0 0 temp 81 2352K 2416K 78643K 2819 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 28 0 21 1 0 1 1 0 8 0 plimitpl 152 14 0 7 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 10 0 6 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 0 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 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1457 0 48 46 0 46 46 0 8 0 ffsino 272 1457 0 48 95 0 95 95 0 8 0 nchpl 144 1709 0 88 61 0 61 61 0 8 0 uvmvnodes 72 1500 0 0 28 0 28 28 0 8 0 vnodes 200 1500 0 0 79 0 79 79 0 8 0 namei 1024 4047 0 4046 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4134 0 4133 9 6 3 5 0 8 2 sigapl 432 200 0 187 2 0 2 2 0 8 0 futexpl 56 258 0 258 1 0 1 1 0 8 1 knotepl 112 63 0 36 1 0 1 1 0 8 0 kqueuepl 104 4 0 2 1 0 1 1 0 8 0 pipepl 112 136 0 115 2 1 1 1 0 8 0 fdescpl 488 201 0 187 3 0 3 3 0 8 1 filepl 152 1004 0 907 6 1 5 5 0 8 1 lockfpl 104 19 0 18 2 1 1 1 0 8 0 lockfspl 32 30 0 29 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 74 0 67 1 0 1 1 0 8 0 zombiepl 144 187 0 187 2 1 1 1 0 8 1 processpl 840 215 0 187 4 0 4 4 0 8 0 procpl 600 262 0 224 4 0 4 4 0 8 1 sockpl 384 74 0 57 3 0 3 3 0 8 1 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 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 256 126 0 0 8 0 8 8 0 8 0 bufpl 256 5285 0 1013 267 0 267 267 0 8 0 anonpl 16 26852 0 19736 31 1 30 30 0 125 0 amapchunkpl 152 735 0 649 5 0 5 5 0 158 1 amappl16 192 521 0 159 20 0 20 20 0 8 1 amappl15 184 9 0 8 2 1 1 1 0 8 0 amappl14 176 20 0 16 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 9 0 8 1 0 1 1 0 8 0 amappl11 152 183 0 173 1 0 1 1 0 8 0 amappl10 144 63 0 58 1 0 1 1 0 8 0 amappl9 136 351 0 346 1 0 1 1 0 8 0 amappl8 128 132 0 115 1 0 1 1 0 8 0 amappl7 120 36 0 31 1 0 1 1 0 8 0 amappl6 112 52 0 45 1 0 1 1 0 8 0 amappl5 104 149 0 138 1 0 1 1 0 8 0 amappl4 96 269 0 243 2 0 2 2 0 8 1 amappl3 88 128 0 121 1 0 1 1 0 8 0 amappl2 80 733 0 681 2 0 2 2 0 8 0 amappl1 72 12664 0 12247 23 5 18 19 0 8 8 amappl 72 469 0 436 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 201 0 187 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 201 0 187 1 0 1 1 0 8 0 vmmpekpl 168 5400 0 5377 2 0 2 2 0 8 0 vmmpepl 168 28258 0 26962 85 15 70 70 0 357 13 vmsppl 360 200 0 187 2 0 2 2 0 8 0 pdppl 4096 409 0 374 6 0 6 6 0 8 1 pvpl 32 105003 0 94956 100 4 96 96 0 265 12 pmappl 224 200 0 187 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 412 0 3 12 0 12 12 0 8 0