panic: timeout_add: to_ticks (-257) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 149556 65392 0 0 0 0 syz-executor.1 *303125 65392 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,fffffeff) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,3,fffffeff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c1d680,2,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c1d680,2,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8064ed6d38,20005302,ffff800020c1d680,2,fffffd807f7c7c00,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807ed3ea38,20005302,ffff800020c1d680,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c1d7c8,ffff800020c1d7b0) at sys_ioctl+0x646 syscall(ffff800020c1d860) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c1d860) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,f68aa838010) at Xsyscall+0x128 end of kernel end trace frame: 0xf6b3d7e8220, 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 (-257) < 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,fffffeff) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,3,fffffeff,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c1d680,2,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c1d680,2,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8064ed6d38,20005302,ffff800020c1d680,2,fffffd807f7c7c00,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807ed3ea38,20005302,ffff800020c1d680,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c1d7c8,ffff800020c1d7b0) at sys_ioctl+0x646 syscall(ffff800020c1d860) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c1d860) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,f68aa838010) at Xsyscall+0x128 end of kernel end trace frame: 0xf6b3d7e8220, count: -10 ddb{1}> show registers rdi 0xffffffff8125d7b7 db_enter+0x17 rsi 0x164a __ALIGN_SIZE+0x64a rbp 0xffff800020c1d2a0 rbx 0xffff800020c1d350 rdx 0x164b __ALIGN_SIZE+0x64b rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff811d6983 kprintf+0x183 r9 0x1 r10 0x25 r11 0xa2d3129f31219948 r12 0x3000000008 r13 0xffff800020c1d2b0 r14 0x100 r15 0x1 rip 0xffffffff8125d7b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c1d290 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=303125 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42978,0xffff800020b424d8 process=0xffff800020b453c0 user=0xffff800020c18000, vmspace=0xfffffd807f00c708 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65392 149556 92746 0 7 0 syz-executor.1 *65392 303125 92746 0 7 0x4000000 syz-executor.1 65392 182207 92746 0 3 0x4000080 fsleep syz-executor.1 65392 85053 92746 0 3 0x4000080 ttyin syz-executor.1 65392 225601 92746 0 3 0x4000080 fsleep syz-executor.1 32724 481343 0 0 3 0x14200 bored sosplice 92746 484487 29894 0 3 0x82 nanosleep syz-executor.1 65524 491757 29894 0 3 0x2 biowait syz-executor.0 29894 254666 80180 0 3 0x82 thrsleep syz-fuzzer 29894 458960 80180 0 2 0x4000482 syz-fuzzer 29894 214990 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 497475 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 348989 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 221431 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 149418 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 211213 80180 0 3 0x4000082 thrsleep syz-fuzzer 29894 515591 80180 0 3 0x4000082 kqread syz-fuzzer 29894 343983 80180 0 3 0x4000082 thrsleep syz-fuzzer 80180 212708 15172 0 3 0x10008a pause ksh 15172 428896 19357 0 3 0x92 select sshd 79990 80218 1 0 3 0x100083 ttyin getty 19357 266541 1 0 3 0x80 select sshd 60536 496654 51572 73 3 0x100090 kqread syslogd 51572 234361 1 0 3 0x100082 netio syslogd 77 401042 1 77 3 0x100090 poll dhclient 28902 174034 1 0 3 0x80 poll dhclient 88446 127812 0 0 3 0x14200 pgzero zerothread 64307 430193 0 0 3 0x14200 aiodoned aiodoned 98296 435483 0 0 3 0x14200 syncer update 77696 322589 0 0 3 0x14200 cleaner cleaner 90060 362332 0 0 3 0x14200 reaper reaper 78804 204653 0 0 3 0x14200 pgdaemon pagedaemon 43366 10545 0 0 3 0x14200 bored crynlk 4133 404988 0 0 3 0x14200 bored crypto 47283 17918 0 0 3 0x40014200 acpi0 acpi0 16181 263388 0 0 3 0x40014200 idle1 38145 396501 0 0 3 0x14200 bored softnet 45440 294835 0 0 3 0x14200 bored systqmp 12082 506949 0 0 3 0x14200 bored systq 69523 352706 0 0 3 0x40014200 bored softclock 28359 66778 0 0 3 0x40014200 idle0 1 236113 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 65392 (syz-executor.1) thread 0xffff800020b439e0 (303125) 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 pcppi_bell+0x37e sys/dev/isa/pcppi.c:237 #7 spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] #7 spkrioctl+0x230 sys/dev/isa/spkr.c:503 #8 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #9 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #10 sys_ioctl+0x646 #11 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #11 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #12 Xsyscall+0x128 Process 65524 (syz-executor.0) thread 0xffff800020b24008 (491757) exclusive rrwlock inode r = 0 (0xfffffd806e708a28) 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 (0xfffffd806a1f75e8) 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 9485 6330K 6338K 78643K 10623 0 0 pcb 23 9K 10K 78643K 147 0 0 rtable 97 3K 3K 78643K 180 0 0 ifaddr 44 11K 11K 78643K 48 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 12K 78643K 26 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1205 75K 76K 78643K 1331 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 3 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 5 13K 25K 78643K 183 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 41 38K 70K 78643K 263 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 24 0 0 in_multi 33 2K 2K 78643K 38 0 0 ether_multi 1 0K 0K 78643K 2 0 0 mrt 0 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 54 238K 238K 78643K 54 0 0 exec 0 0K 1K 78643K 183 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 84 20K 21K 78643K 1338 0 0 UVM aobj 8 2K 2K 78643K 8 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 23 0 0 NDP 8 0K 0K 78643K 13 0 0 temp 111 2355K 2419K 78643K 3219 0 0 kqueue 0 0K 0K 78643K 4 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 280 117 0 110 1 0 1 1 0 8 0 plimitpl 152 15 0 8 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 tcpqe 32 25 0 25 1 1 0 1 0 8 0 tcpcb 544 34 0 30 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 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 4 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1748 0 347 46 0 46 46 0 8 0 ffsino 272 1748 0 347 95 1 94 95 0 8 0 nchpl 144 2209 0 588 61 0 61 61 0 8 0 uvmvnodes 72 1825 0 0 34 0 34 34 0 8 0 vnodes 200 1825 0 0 97 0 97 97 0 8 0 namei 1024 5684 0 5683 2 1 1 1 0 8 0 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 6316 0 6315 6 5 1 5 0 8 0 sigapl 432 351 0 338 2 0 2 2 0 8 0 futexpl 56 1892 0 1890 1 0 1 1 0 8 0 knotepl 112 91 0 64 2 1 1 2 0 8 0 kqueuepl 104 59 0 57 1 0 1 1 0 8 0 pipepl 112 246 0 227 2 1 1 1 0 8 0 fdescpl 488 352 0 338 3 1 2 3 0 8 0 filepl 152 2063 0 1962 6 1 5 5 0 8 1 lockfpl 104 76 0 75 3 2 1 1 0 8 0 lockfspl 32 132 0 131 3 2 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 22 0 12 1 0 1 1 0 8 0 ucredpl 96 441 0 434 1 0 1 1 0 8 0 zombiepl 144 338 0 338 2 1 1 1 0 8 1 processpl 840 367 0 338 4 0 4 4 0 8 0 procpl 600 756 0 714 4 0 4 4 0 8 0 sosppl 128 5 0 5 1 1 0 1 0 8 0 sockpl 384 223 0 206 3 0 3 3 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 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 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 108 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 125 0 0 8 0 8 8 0 8 0 bufpl 256 5645 0 1018 290 0 290 290 0 8 0 anonpl 16 54791 0 47194 49 1 48 48 0 125 15 amapchunkpl 152 1707 0 1604 6 1 5 6 0 158 0 amappl16 192 2322 0 1934 44 16 28 32 0 8 8 amappl15 184 5 0 3 1 0 1 1 0 8 0 amappl14 176 6 0 5 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 88 0 84 1 0 1 1 0 8 0 amappl11 152 181 0 172 1 0 1 1 0 8 0 amappl10 144 56 0 53 1 0 1 1 0 8 0 amappl9 136 358 0 355 1 0 1 1 0 8 0 amappl8 128 209 0 189 1 0 1 1 0 8 0 amappl7 120 41 0 35 1 0 1 1 0 8 0 amappl6 112 54 0 46 1 0 1 1 0 8 0 amappl5 104 108 0 96 1 0 1 1 0 8 0 amappl4 96 350 0 326 2 1 1 2 0 8 0 amappl3 88 140 0 135 1 0 1 1 0 8 0 amappl2 80 2264 0 2212 2 0 2 2 0 8 0 amappl1 72 15990 0 15566 23 13 10 19 0 8 0 amappl 72 970 0 932 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 352 0 338 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 352 0 338 1 0 1 1 0 8 0 vmmpekpl 168 6758 0 6738 2 0 2 2 0 8 0 vmmpepl 168 46138 0 44798 89 16 73 73 0 357 11 vmsppl 360 351 0 338 2 0 2 2 0 8 0 pdppl 4096 711 0 676 6 1 5 6 0 8 0 pvpl 32 172898 0 162318 131 7 124 124 0 265 38 pmappl 224 351 0 338 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 436 0 5 13 0 13 13 0 8 0