panic: timeout_add: to_ticks (-973078528) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 45541 85104 0 0 0 1 syz-executor.1 * 38154 85104 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,c6000000) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,20,c6000000,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,80085301,ffff800020c3b040,2,ffff800020b43080) at spkrioctl+0x123 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,80085301,ffff800020c3b040,2,ffff800020b43080) at spkrioctl+0x123 sys/dev/isa/spkr.c:489 VOP_IOCTL(fffffd807ae344b0,80085301,ffff800020c3b040,2,fffffd807f7c7c00,ffff800020b43080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80672d7ad0,80085301,ffff800020c3b040,ffff800020b43080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43080,ffff800020c3b188,ffff800020c3b170) at sys_ioctl+0x646 syscall(ffff800020c3b220) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c3b220) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,8dc3cc1d010) at Xsyscall+0x128 end of kernel end trace frame: 0x8df09937ec0, 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(ffff80000066d000,20,c6000000,1) at pcppi_bell+672 spkrioctl(1b00,80085301,ffff800020c3b040,2,ffff800020b43080) at spkrioctl+291 VOP_IOCTL(fffffd807ae344b0,80085301,ffff800020c3b040,2,fffffd807f7c7c00,ffff800020b43080) at VOP_IOCTL+154 vn_ioctl(fffffd80672d7ad0,80085301,ffff800020c3b040,ffff800020b43080) at vn_ioctl+201 sys_ioctl(ffff800020b43080,ffff800020c3b188,ffff800020c3b170) at sys_ioctl+1606 syscall(ffff800020c3b220) at syscall+1452 Xsyscall(6,0,ffffffffffffff88,0,3,8dc3cc1d010) at Xsyscall+296 end of kernel end trace frame: 0x8df09937ec0, count: -10 ddb{0}> show registers rdi 18446744071587636919 db_enter+23 rsi 4730 __ALIGN_SIZE+634 rbp 18446603336770890848 rbx 18446603336770891024 rdx 4731 __ALIGN_SIZE+635 rcx 18446603336266588160 rax 18446603336266588160 r8 18446744071580452035 kprintf+387 r9 1 r10 37 r11 4996460409548563728 r12 206158430216 r13 18446603336770890864 r14 256 r15 1 rip 18446744071587636920 db_enter+24 cs 8 rflags 582 rsp 18446603336770890832 ss 16 db_enter+24: addq $8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=38154 stat=onproc flags process=0 proc=4000000 pri=75, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42720,0xffffffff8230d660 process=0xffff800020b45078 user=0xffff800020c36000, vmspace=0xfffffd807efff9d8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85104 45541 28274 0 7 0 syz-executor.1 *85104 38154 28274 0 7 0x4000000 syz-executor.1 62327 263643 0 0 3 0x14200 bored sosplice 28274 317036 75241 0 3 0x82 nanosleep syz-executor.1 111 274281 75241 0 3 0x2 biowait syz-executor.0 75241 391310 76349 0 3 0x82 thrsleep syz-fuzzer 75241 120569 76349 0 3 0x4000082 nanosleep syz-fuzzer 75241 281947 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 406946 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 340422 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 151028 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 421237 76349 0 3 0x4000082 kqread syz-fuzzer 75241 183942 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 154844 76349 0 3 0x4000082 thrsleep syz-fuzzer 75241 417365 76349 0 3 0x4000082 thrsleep syz-fuzzer 76349 245324 7273 0 3 0x10008a pause ksh 7273 501241 84338 0 3 0x92 select sshd 57484 52929 1 0 3 0x100083 ttyin getty 84338 406153 1 0 3 0x80 select sshd 36325 513150 94094 73 3 0x100090 kqread syslogd 94094 150070 1 0 3 0x100082 netio syslogd 36609 404593 1 77 3 0x100090 poll dhclient 50144 306451 1 0 3 0x80 poll dhclient 83075 8535 0 0 3 0x14200 pgzero zerothread 21719 63363 0 0 3 0x14200 aiodoned aiodoned 9881 492185 0 0 3 0x14200 syncer update 33463 188025 0 0 3 0x14200 cleaner cleaner 43098 377440 0 0 3 0x14200 reaper reaper 5074 8680 0 0 3 0x14200 pgdaemon pagedaemon 71156 274090 0 0 3 0x14200 bored crynlk 89400 57754 0 0 3 0x14200 bored crypto 44942 61908 0 0 3 0x40014200 acpi0 acpi0 29521 154728 0 0 3 0x40014200 idle1 63835 499375 0 0 3 0x14200 bored softnet 8136 109977 0 0 3 0x14200 bored systqmp 30175 117809 0 0 3 0x14200 bored systq 64164 221327 0 0 3 0x40014200 bored softclock 93304 401309 0 0 3 0x40014200 idle0 1 309217 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 85104 (syz-executor.1) thread 0xffff800020b43080 (38154) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823220c8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+1418 #1 syscall+1151 #2 Xsyscall+296 Process 111 (syz-executor.0) thread 0xffff800020b24bc0 (274281) exclusive rrwlock inode r = 0 (0xfffffd806ee194e8) 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 (0xfffffd806a1f16f8) 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 9504 6340K 6355K 78643K 10786 0 0 pcb 23 9K 11K 78643K 294 0 0 rtable 100 3K 4K 78643K 216 0 0 ifaddr 51 12K 12K 78643K 73 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 17 0 0 iov 0 0K 16K 78643K 74 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 75K 78643K 1548 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 12 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 63 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 710 0 0 sigio 0 0K 0K 78643K 5 0 0 proc 41 38K 70K 78643K 294 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 42 0 0 in_multi 33 2K 2K 78643K 50 0 0 ether_multi 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 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 203 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 81 20K 29K 78643K 2939 0 0 UVM aobj 37 2K 2K 78643K 37 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 16 0 0 NDP 10 0K 0K 78643K 20 0 0 temp 155 2363K 2431K 78643K 4501 0 0 kqueue 0 0K 0K 78643K 7 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 280 267 0 260 1 0 1 1 0 8 0 plimitpl 152 17 0 10 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 544 106 0 102 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 2 0 2 2 2 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 semapl 112 61 0 51 1 0 1 1 0 8 0 shmpl 112 35 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2662 0 1261 46 0 46 46 0 8 0 ffsino 272 2662 0 1261 95 1 94 95 0 8 0 nchpl 144 3819 0 2198 61 0 61 61 0 8 0 uvmvnodes 72 2750 0 0 50 0 50 50 0 8 0 vnodes 200 2750 0 0 145 0 145 145 0 8 0 namei 1024 9937 0 9936 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 9340 0 9339 8 7 1 5 0 8 0 sigapl 432 878 0 865 2 0 2 2 0 8 0 futexpl 56 6522 0 6522 1 0 1 1 0 8 1 knotepl 112 187 0 160 3 1 2 2 0 8 1 kqueuepl 104 151 0 149 1 0 1 1 0 8 0 pipepl 112 536 0 517 2 1 1 1 0 8 0 fdescpl 488 879 0 865 3 1 2 3 0 8 0 filepl 152 4319 0 4224 8 3 5 6 0 8 1 lockfpl 104 279 0 278 2 1 1 1 0 8 0 lockfspl 32 307 0 306 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 24 0 14 1 0 1 1 0 8 0 ucredpl 96 1301 0 1294 1 0 1 1 0 8 0 zombiepl 144 865 0 865 2 1 1 1 0 8 1 processpl 840 894 0 865 4 0 4 4 0 8 0 procpl 600 2349 0 2310 4 0 4 4 0 8 0 sosppl 128 9 0 9 4 4 0 1 0 8 0 sockpl 384 522 0 505 4 1 3 4 0 8 1 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 117 0 0 14 0 14 14 0 8 1 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 135 0 0 8 0 8 8 0 8 0 bufpl 256 6131 0 1014 320 0 320 320 0 8 0 anonpl 16 83296 0 75585 56 10 46 48 0 125 14 amapchunkpl 152 4743 0 4660 15 11 4 9 0 158 0 amappl16 192 3701 0 3292 37 10 27 33 0 8 6 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 7 0 6 2 1 1 1 0 8 0 amappl13 168 405 0 401 1 0 1 1 0 8 0 amappl12 160 323 0 320 1 0 1 1 0 8 0 amappl11 152 180 0 171 1 0 1 1 0 8 0 amappl10 144 66 0 60 2 1 1 1 0 8 0 amappl9 136 352 0 349 1 0 1 1 0 8 0 amappl8 128 137 0 117 1 0 1 1 0 8 0 amappl7 120 414 0 409 1 0 1 1 0 8 0 amappl6 112 55 0 48 1 0 1 1 0 8 0 amappl5 104 129 0 118 1 0 1 1 0 8 0 amappl4 96 276 0 246 2 1 1 2 0 8 0 amappl3 88 460 0 453 1 0 1 1 0 8 0 amappl2 80 7521 0 7470 2 0 2 2 0 8 0 amappl1 72 26952 0 26544 23 13 10 19 0 8 0 amappl 72 2556 0 2524 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 36 0 0 1 0 1 1 0 8 0 uaddrrnd 24 879 0 865 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 879 0 865 1 0 1 1 0 8 0 vmmpekpl 168 10748 0 10728 2 0 2 2 0 8 0 vmmpepl 168 97308 0 95969 98 26 72 74 0 357 13 vmsppl 360 878 0 865 2 0 2 2 0 8 0 pdppl 4096 1766 0 1730 6 1 5 6 0 8 0 pvpl 32 254382 0 243699 140 18 122 124 0 265 33 pmappl 224 878 0 865 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 468 0 5 14 0 14 14 0 8 0