panic: timeout_add: to_ticks (-973078528) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *157475 15414 0 0 0x4000000 0K syz-executor.1 363733 47394 0 0x2 0 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,c6000000) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,fd8,c6000000,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c36f40,46,ffff800020b42720) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c36f40,46,ffff800020b42720) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd80662723c8,20005302,ffff800020c36f40,46,fffffd807f7c79c0,ffff800020b42720) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806925cd30,20005302,ffff800020c36f40,ffff800020b42720) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42720,ffff800020c37088,ffff800020c37070) at sys_ioctl+0x646 syscall(ffff800020c37120) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c37120) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,87eed09e010) at Xsyscall+0x128 end of kernel end trace frame: 0x8813c8e2b50, 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 (-973078528) < 0 ddb{0}> trace db_enter() at db_enter+24 panic() at panic+372 timeout_add(ffff80000066d060,c6000000) at timeout_add+404 pcppi_bell(ffff80000066d000,fd8,c6000000,1) at pcppi_bell+672 spkrioctl(1b00,20005302,ffff800020c36f40,46,ffff800020b42720) at spkrioctl+560 VOP_IOCTL(fffffd80662723c8,20005302,ffff800020c36f40,46,fffffd807f7c79c0,ffff800020b42720) at VOP_IOCTL+154 vn_ioctl(fffffd806925cd30,20005302,ffff800020c36f40,ffff800020b42720) at vn_ioctl+201 sys_ioctl(ffff800020b42720,ffff800020c37088,ffff800020c37070) at sys_ioctl+1606 syscall(ffff800020c37120) at syscall+1452 Xsyscall(6,0,ffffffffffffff88,0,3,87eed09e010) at Xsyscall+296 end of kernel end trace frame: 0x8813c8e2b50, count: -10 ddb{0}> show registers rdi 18446744071590259447 db_enter+23 rsi 4648 __ALIGN_SIZE+552 rbp 18446603336770874208 rbx 18446603336770874384 rdx 4649 __ALIGN_SIZE+553 rcx 18446603336266584064 rax 18446603336266584064 r8 18446744071585311987 kprintf+387 r9 1 r10 37 r11 12966401971293214764 r12 206158430216 r13 18446603336770874224 r14 256 r15 1 rip 18446744071590259448 db_enter+24 cs 8 rflags 582 rsp 18446603336770874192 ss 16 db_enter+24: addq $8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=157475 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff800020b43c38,0xffffffff82353980 process=0xffff800020b45078 user=0xffff800020c32000, vmspace=0xfffffd807f00db40 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15414 460435 47394 0 2 0 syz-executor.1 *15414 157475 47394 0 7 0x4000000 syz-executor.1 93104 332820 0 0 3 0x14200 bored sosplice 47394 363733 59649 0 7 0x2 syz-executor.1 46755 175156 59649 0 3 0x2 biowait syz-executor.0 59649 277312 13628 0 3 0x82 thrsleep syz-fuzzer 59649 252922 13628 0 3 0x4000082 nanosleep syz-fuzzer 59649 83679 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 434415 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 311020 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 46852 13628 0 3 0x4000082 kqread syz-fuzzer 59649 172871 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 118867 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 22776 13628 0 3 0x4000082 thrsleep syz-fuzzer 59649 295810 13628 0 3 0x4000082 thrsleep syz-fuzzer 13628 117706 35782 0 3 0x10008a pause ksh 35782 115235 58052 0 3 0x92 select sshd 67143 494022 1 0 3 0x100083 ttyin getty 58052 485187 1 0 3 0x80 select sshd 4851 484196 59843 73 3 0x100090 kqread syslogd 59843 179318 1 0 3 0x100082 netio syslogd 65116 357823 1 77 3 0x100090 poll dhclient 62052 479655 1 0 3 0x80 poll dhclient 25392 158017 0 0 3 0x14200 pgzero zerothread 52988 480283 0 0 3 0x14200 aiodoned aiodoned 20279 297517 0 0 3 0x14200 syncer update 86554 22844 0 0 3 0x14200 cleaner cleaner 27669 367971 0 0 3 0x14200 reaper reaper 72046 462775 0 0 3 0x14200 pgdaemon pagedaemon 90717 424249 0 0 3 0x14200 bored crynlk 77233 222384 0 0 3 0x14200 bored crypto 56645 303714 0 0 3 0x40014200 acpi0 acpi0 97641 8040 0 0 3 0x40014200 idle1 53882 279135 0 0 3 0x14200 bored softnet 33287 54722 0 0 3 0x14200 bored systqmp 34824 47783 0 0 3 0x14200 bored systq 37432 452490 0 0 3 0x40014200 bored softclock 38076 197962 0 0 3 0x40014200 idle0 1 495202 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 15414 (syz-executor.1) thread 0xffff800020b42720 (157475) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82309fb0) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436 #0 witness_lock+1418 #1 ___mp_acquire_count+103 #2 mi_switch+944 #3 sleep_finish+272 #4 sleep_finish_all+52 #5 tsleep+444 #6 spkrioctl+609 #7 VOP_IOCTL+154 #8 vn_ioctl+201 #9 sys_ioctl+1606 #10 syscall+1452 #11 Xsyscall+296 Process 46755 (syz-executor.0) thread 0xffff800020b25070 (175156) exclusive rrwlock inode r = 0 (0xfffffd806e7550a8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 #0 witness_lock+1418 #1 _rw_enter+1101 #2 _rrw_enter+96 #3 ufs_ihashins+103 #4 ffs_vget+317 #5 ffs_inode_alloc+451 #6 ufs_mkdir+271 #7 VOP_MKDIR+118 #8 domkdirat+301 #9 syscall+1452 #10 Xsyscall+296 exclusive rrwlock inode r = 0 (0xfffffd806a2096f8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+1418 #1 _rw_enter+1101 #2 _rrw_enter+96 #3 VOP_LOCK+87 #4 vn_lock+110 #5 vfs_lookup+245 #6 namei+1202 #7 domkdirat+129 #8 syscall+1452 #9 Xsyscall+296 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9516 14547K 14556K 78643K 10851 0 0 pcb 23 9K 10K 78643K 460 0 0 rtable 100 3K 4K 78643K 248 0 0 ifaddr 56 13K 13K 78643K 97 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 16K 78643K 95 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1202 75K 76K 78643K 1710 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 16 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 86 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 21K 78643K 837 0 0 sigio 0 0K 0K 78643K 21 0 0 proc 41 38K 70K 78643K 356 0 0 subproc 64 65538K 67586K 78643K 81 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 105 0 0 in_multi 33 2K 2K 78643K 73 0 0 ether_multi 1 0K 0K 78643K 4 0 0 mrt 1 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 249 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 86 21K 30K 78643K 3480 0 0 UVM aobj 49 2K 2K 78643K 51 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 30 0 0 NDP 11 0K 0K 78643K 26 0 0 temp 160 2366K 2431K 78643K 4991 0 0 kqueue 0 0K 0K 78643K 6 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 280 444 0 437 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 41 0 1 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 147 0 143 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 8 0 8 4 4 0 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 10 0 3 1 0 1 1 0 8 0 semapl 112 84 0 74 1 0 1 1 0 8 0 shmpl 112 49 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3025 0 1615 46 0 46 46 0 8 0 ffsino 272 3025 0 1615 95 0 95 95 0 8 0 nchpl 144 4483 0 2874 61 0 61 61 0 8 0 uvmvnodes 72 3145 0 0 58 0 58 58 0 8 0 vnodes 200 3145 0 0 166 0 166 166 0 8 0 namei 1024 13050 0 13049 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 13550 0 13549 8 7 1 6 0 8 0 sigapl 432 1005 0 992 2 0 2 2 0 8 0 futexpl 56 9124 0 9124 1 0 1 1 0 8 1 knotepl 112 243 0 216 4 3 1 2 0 8 0 kqueuepl 104 240 0 238 1 0 1 1 0 8 0 pipepl 112 624 0 605 3 2 1 2 0 8 0 fdescpl 488 1006 0 992 3 1 2 3 0 8 0 filepl 152 6134 0 6039 7 2 5 5 0 8 1 lockfpl 104 241 0 241 2 1 1 1 0 8 1 lockfspl 32 449 0 449 2 1 1 1 0 8 1 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 13 1 0 1 1 0 8 0 ucredpl 96 1739 0 1732 1 0 1 1 0 8 0 zombiepl 144 992 0 992 2 1 1 1 0 8 1 processpl 840 1021 0 992 4 0 4 4 0 8 0 procpl 600 2879 0 2840 4 0 4 4 0 8 0 sosppl 128 18 0 18 5 4 1 1 0 8 1 sockpl 384 829 0 812 3 0 3 3 0 8 1 mcl64k 65536 373 0 0 47 2 45 47 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 113 0 0 14 1 13 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 490 0 0 28 0 28 28 0 8 0 bufpl 256 6551 0 1022 346 0 346 346 0 8 0 anonpl 16 107040 0 99266 70 22 48 48 0 125 14 amapchunkpl 152 6042 0 5957 24 19 5 11 0 158 0 amappl16 192 4585 0 4177 55 26 29 33 0 8 8 amappl15 184 411 0 409 1 0 1 1 0 8 0 amappl14 176 419 0 414 2 1 1 1 0 8 0 amappl13 168 27 0 24 1 0 1 1 0 8 0 amappl12 160 12 0 11 2 1 1 1 0 8 0 amappl11 152 590 0 578 1 0 1 1 0 8 0 amappl10 144 63 0 57 1 0 1 1 0 8 0 amappl9 136 352 0 349 1 0 1 1 0 8 0 amappl8 128 141 0 119 1 0 1 1 0 8 0 amappl7 120 38 0 33 1 0 1 1 0 8 0 amappl6 112 460 0 454 1 0 1 1 0 8 0 amappl5 104 130 0 114 1 0 1 1 0 8 0 amappl4 96 265 0 243 1 0 1 1 0 8 0 amappl3 88 144 0 139 1 0 1 1 0 8 0 amappl2 80 8929 0 8875 2 0 2 2 0 8 0 amappl1 72 30749 0 30334 23 13 10 19 0 8 0 amappl 72 3089 0 3056 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 50 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1006 0 992 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1006 0 992 1 0 1 1 0 8 0 vmmpekpl 168 12291 0 12271 2 0 2 2 0 8 0 vmmpepl 168 115891 0 114541 106 35 71 74 0 357 6 vmsppl 360 1005 0 992 2 0 2 2 0 8 0 pdppl 4096 2019 0 1984 5 0 5 5 0 8 0 pvpl 32 335984 0 325227 170 41 129 129 0 265 39 pmappl 224 1005 0 992 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 560 0 6 16 0 16 16 0 8 0