panic: timeout_add: to_ticks (-997270241) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *153691 24762 0 0x1000 0x4080000 0K syz-executor.1 400421 24762 0 0x1000 0x4080080 1 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,c48edd1f) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,cb195efd,c48edd1f,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c2f490,2,ffff800020b42018) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c2f490,2,ffff800020b42018) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80711201e8,20005302,ffff800020c2f490,2,fffffd807f7c7a80,ffff800020b42018) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8071168e58,20005302,ffff800020c2f490,ffff800020b42018) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42018,ffff800020c2f5d8,ffff800020c2f5c0) at sys_ioctl+0x646 syscall(ffff800020c2f670) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2f670) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,fce1b9fb010) at Xsyscall+0x128 end of kernel end trace frame: 0xfd063a06d30, 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 (-997270241) < 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,c48edd1f) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,cb195efd,c48edd1f,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c2f490,2,ffff800020b42018) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c2f490,2,ffff800020b42018) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80711201e8,20005302,ffff800020c2f490,2,fffffd807f7c7a80,ffff800020b42018) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8071168e58,20005302,ffff800020c2f490,ffff800020b42018) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42018,ffff800020c2f5d8,ffff800020c2f5c0) at sys_ioctl+0x646 syscall(ffff800020c2f670) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2f670) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,fce1b9fb010) at Xsyscall+0x128 end of kernel end trace frame: 0xfd063a06d30, count: -10 ddb{0}> show registers rdi 0xffffffff8125d7b7 db_enter+0x17 rsi 0x1389 __ALIGN_SIZE+0x389 rbp 0xffff800020c2f0b0 rbx 0xffff800020c2f160 rdx 0x138a __ALIGN_SIZE+0x38a rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff811d6983 kprintf+0x183 r9 0x1 r10 0x25 r11 0xd5b1e917a3276893 r12 0x3000000008 r13 0xffff800020c2f0c0 r14 0x100 r15 0x1 rip 0xffffffff8125d7b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c2f0a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=153691 stat=onproc flags process=1000 proc=4080000 pri=21, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b432d8,0xffff800020b42be0 process=0xffff800020b45078 user=0xffff800020c2a000, vmspace=0xfffffd807f00c5a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24762 212635 59651 0 3 0x3000 suspend syz-executor.1 *24762 153691 59651 0 7 0x4081000 syz-executor.1 24762 400421 59651 0 7 0x4081080 syz-executor.1 61857 458958 0 0 3 0x14200 bored sosplice 59651 139550 44030 0 3 0x82 nanosleep syz-executor.1 53958 496333 44030 0 3 0x2 biowait syz-executor.0 44030 134892 95155 0 3 0x82 thrsleep syz-fuzzer 44030 279996 95155 0 3 0x4000082 nanosleep syz-fuzzer 44030 141512 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 285153 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 410585 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 466543 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 516470 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 485847 95155 0 3 0x4000082 thrsleep syz-fuzzer 44030 158723 95155 0 3 0x4000082 kqread syz-fuzzer 44030 494295 95155 0 3 0x4000082 thrsleep syz-fuzzer 95155 60839 74036 0 3 0x10008a pause ksh 74036 145265 27597 0 3 0x92 select sshd 5211 119196 1 0 3 0x100083 ttyin getty 27597 326058 1 0 3 0x80 select sshd 44382 322024 91647 73 3 0x100090 kqread syslogd 91647 1138 1 0 3 0x100082 netio syslogd 85250 311305 1 77 3 0x100090 poll dhclient 41539 460068 1 0 3 0x80 poll dhclient 3267 328464 0 0 3 0x14200 pgzero zerothread 63898 90207 0 0 3 0x14200 aiodoned aiodoned 70351 297288 0 0 3 0x14200 syncer update 53000 448617 0 0 3 0x14200 cleaner cleaner 56779 197780 0 0 3 0x14200 reaper reaper 61010 101546 0 0 3 0x14200 pgdaemon pagedaemon 77718 57130 0 0 3 0x14200 bored crynlk 72048 352986 0 0 3 0x14200 bored crypto 63066 212731 0 0 3 0x40014200 acpi0 acpi0 64554 242366 0 0 3 0x40014200 idle1 58843 285056 0 0 3 0x14200 bored softnet 27853 269541 0 0 3 0x14200 bored systqmp 31596 304883 0 0 3 0x14200 bored systq 37381 25082 0 0 3 0x40014200 bored softclock 12006 68309 0 0 3 0x40014200 idle0 1 433106 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 24762 (syz-executor.1) thread 0xffff800020b42018 (153691) 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 53958 (syz-executor.0) thread 0xffff800020b24260 (496333) exclusive rrwlock inode r = 0 (0xfffffd8071025a30) 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 vget+0x1b8 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x151 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x84 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x159c sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523 #11 namei+0x4b2 sys/kern/vfs_lookup.c:224 #12 dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 #13 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #13 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a1e2918) 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 dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9466 6324K 6336K 78643K 10583 0 0 pcb 23 9K 9K 78643K 85 0 0 rtable 100 3K 4K 78643K 190 0 0 ifaddr 39 10K 11K 78643K 52 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 12K 78643K 8 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1202 75K 75K 78643K 1243 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 4 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 71 0 0 sigio 0 0K 0K 78643K 6 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 ip_moptions 0 0K 0K 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 168 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 77 20K 20K 78643K 954 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 6 0K 0K 78643K 13 0 0 temp 87 2352K 2418K 78643K 2933 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 49 0 40 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 tcpcb 544 14 0 10 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 3 0 3 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 1537 0 128 46 0 46 46 0 8 0 ffsino 272 1537 0 128 95 0 95 95 0 8 0 nchpl 144 1843 0 222 61 0 61 61 0 8 0 uvmvnodes 72 1584 0 0 29 0 29 29 0 8 0 vnodes 200 1584 0 0 84 0 84 84 0 8 0 namei 1024 4526 0 4526 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4713 0 4712 7 6 1 5 0 8 0 sigapl 432 239 0 226 2 0 2 2 0 8 0 futexpl 56 690 0 689 1 0 1 1 0 8 0 knotepl 112 74 0 47 2 0 2 2 0 8 1 kqueuepl 104 25 0 23 1 0 1 1 0 8 0 pipepl 112 134 0 115 2 1 1 1 0 8 0 fdescpl 488 240 0 226 3 1 2 3 0 8 0 filepl 152 1278 0 1181 5 0 5 5 0 8 1 lockfpl 104 34 0 33 2 1 1 1 0 8 0 lockfspl 32 39 0 38 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 96 168 0 161 1 0 1 1 0 8 0 zombiepl 144 226 0 226 2 1 1 1 0 8 1 processpl 840 255 0 226 4 0 4 4 0 8 0 procpl 600 391 0 351 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 384 111 0 92 3 0 3 3 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 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 2 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 256 142 0 0 8 0 8 8 0 8 0 bufpl 256 5522 0 1013 282 0 282 282 0 8 0 anonpl 16 34121 0 26814 47 1 46 46 0 125 16 amapchunkpl 152 1019 0 936 5 1 4 5 0 158 0 amappl16 192 957 0 577 31 4 27 31 0 8 7 amappl15 184 29 0 27 2 1 1 1 0 8 0 amappl14 176 35 0 32 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 6 0 5 2 1 1 1 0 8 0 amappl11 152 182 0 173 1 0 1 1 0 8 0 amappl10 144 81 0 78 2 1 1 1 0 8 0 amappl9 136 335 0 331 1 0 1 1 0 8 0 amappl8 128 129 0 112 1 0 1 1 0 8 0 amappl7 120 38 0 31 1 0 1 1 0 8 0 amappl6 112 55 0 48 1 0 1 1 0 8 0 amappl5 104 183 0 171 1 0 1 1 0 8 0 amappl4 96 265 0 243 2 1 1 2 0 8 0 amappl3 88 133 0 126 1 0 1 1 0 8 0 amappl2 80 1166 0 1111 2 0 2 2 0 8 0 amappl1 72 13432 0 13016 23 12 11 19 0 8 1 amappl 72 593 0 560 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 24 240 0 226 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 240 0 226 1 0 1 1 0 8 0 vmmpekpl 168 5661 0 5638 2 0 2 2 0 8 0 vmmpepl 168 32596 0 31280 88 15 73 73 0 357 15 vmsppl 360 239 0 226 2 0 2 2 0 8 0 pdppl 4096 487 0 452 6 1 5 6 0 8 0 pvpl 32 121389 0 111145 128 7 121 121 0 265 34 pmappl 224 239 0 226 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 429 0 4 13 0 13 13 0 8 0