panic: timeout_add: to_ticks (-2046423750) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 481648 80102 0 0 0 0 syz-executor.1 *238874 80102 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(ffff80000066d060,86060d3a) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,dff34f65,86060d3a,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c27090,2,ffff800020b42720) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c27090,2,ffff800020b42720) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8079e5a410,20005302,ffff800020c27090,2,fffffd807f7c7a20,ffff800020b42720) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069259c90,20005302,ffff800020c27090,ffff800020b42720) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42720,ffff800020c271d8,ffff800020c271c0) at sys_ioctl+0x646 syscall(ffff800020c27270) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c27270) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,83c7cc03010) at Xsyscall+0x128 end of kernel end trace frame: 0x83e9de5f5f0, 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 (-2046423750) < 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(ffff80000066d060,86060d3a) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,dff34f65,86060d3a,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c27090,2,ffff800020b42720) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c27090,2,ffff800020b42720) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8079e5a410,20005302,ffff800020c27090,2,fffffd807f7c7a20,ffff800020b42720) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069259c90,20005302,ffff800020c27090,ffff800020b42720) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42720,ffff800020c271d8,ffff800020c271c0) at sys_ioctl+0x646 syscall(ffff800020c27270) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c27270) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,83c7cc03010) at Xsyscall+0x128 end of kernel end trace frame: 0x83e9de5f5f0, count: -10 ddb{1}> show registers rdi 0xffffffff816f6437 db_enter+0x17 rsi 0x1787 __ALIGN_SIZE+0x787 rbp 0xffff800020c26cb0 rbx 0xffff800020c26d60 rdx 0x1788 __ALIGN_SIZE+0x788 rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff81555b63 kprintf+0x183 r9 0x1 r10 0x25 r11 0xbdc7d16a0564de7e r12 0x3000000008 r13 0xffff800020c26cc0 r14 0x100 r15 0x1 rip 0xffffffff816f6438 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c26ca0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=238874 stat=onproc flags process=0 proc=4000000 pri=21, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42018,0xffff800020b43540 process=0xffff800020b44010 user=0xffff800020c22000, vmspace=0xfffffd807f00cb40 estcpu=26, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49220 175292 36412 0 3 0x80 nanosleep syz-executor.0 49220 368361 36412 0 3 0x4000080 fifor syz-executor.0 80102 481648 20437 0 7 0 syz-executor.1 *80102 238874 20437 0 7 0x4000000 syz-executor.1 80102 359035 20437 0 3 0x4000080 bell syz-executor.1 80102 220774 20437 0 3 0x4000080 fsleep syz-executor.1 80102 193319 20437 0 3 0x4000080 fsleep syz-executor.1 20437 247436 46059 0 3 0x82 nanosleep syz-executor.1 98997 282412 0 0 3 0x14200 bored sosplice 36412 349105 46059 0 3 0x82 nanosleep syz-executor.0 46059 230307 56333 0 3 0x82 thrsleep syz-fuzzer 46059 226153 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 354058 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 265172 56333 0 3 0x4000082 kqread syz-fuzzer 46059 319156 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 198917 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 264513 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 357711 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 6435 56333 0 3 0x4000082 thrsleep syz-fuzzer 46059 158853 56333 0 3 0x4000082 thrsleep syz-fuzzer 56333 262015 33790 0 3 0x10008a pause ksh 33790 444407 4986 0 3 0x92 select sshd 78893 121609 1 0 3 0x100083 ttyin getty 4986 32433 1 0 3 0x80 select sshd 17307 103388 98518 73 3 0x100090 kqread syslogd 98518 61969 1 0 3 0x100082 netio syslogd 33246 260666 1 77 3 0x100090 poll dhclient 76396 241767 1 0 3 0x80 poll dhclient 66465 224492 0 0 3 0x14200 pgzero zerothread 86789 242057 0 0 3 0x14200 aiodoned aiodoned 7873 173906 0 0 3 0x14200 syncer update 42736 301478 0 0 3 0x14200 cleaner cleaner 79240 173908 0 0 3 0x14200 reaper reaper 71247 439389 0 0 3 0x14200 pgdaemon pagedaemon 76109 242777 0 0 3 0x14200 bored crynlk 52593 440859 0 0 3 0x14200 bored crypto 41567 442394 0 0 3 0x40014200 acpi0 acpi0 86897 219173 0 0 3 0x40014200 idle1 52224 338447 0 0 3 0x14200 bored softnet 40081 502821 0 0 3 0x14200 bored systqmp 24405 166202 0 0 3 0x14200 bored systq 35484 446096 0 0 3 0x40014200 bored softclock 8594 438483 0 0 3 0x40014200 idle0 1 387103 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 80102 (syz-executor.1) thread 0xffff800020b42720 (238874) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823174f8) 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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9523 6346K 6362K 78643K 10932 0 0 pcb 25 9K 10K 78643K 593 0 0 rtable 100 3K 4K 78643K 338 0 0 ifaddr 58 13K 14K 78643K 140 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 23 0 0 iov 0 0K 16K 78643K 113 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1204 75K 76K 78643K 1771 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 18 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 131 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 918 0 0 sigio 0 0K 0K 78643K 7 0 0 proc 42 38K 70K 78643K 411 0 0 subproc 64 65538K 67586K 78643K 102 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 114 0 0 in_multi 33 2K 2K 78643K 75 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 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 83 20K 29K 78643K 3760 0 0 UVM aobj 41 2K 3K 78643K 47 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 36 0 0 NDP 12 0K 0K 78643K 39 0 0 temp 170 2367K 2441K 78643K 5277 0 0 kqueue 0 0K 0K 78643K 14 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 5 0 1 1 0 1 1 0 8 0 inpcbpl 280 434 0 427 1 0 1 1 0 8 0 plimitpl 152 27 0 20 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 50 0 10 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 153 0 149 1 0 1 1 0 8 0 nd6 48 6 0 2 1 0 1 1 0 8 0 ppxss 1128 17 0 17 3 3 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 229 0 41 12 0 12 12 0 8 0 art_table 32 230 0 41 2 0 2 2 0 8 0 art_node 16 49 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 2 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 129 0 119 2 1 1 1 0 8 0 shmpl 112 45 0 6 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3160 0 1740 46 0 46 46 0 8 0 ffsino 272 3160 0 1740 95 0 95 95 0 8 0 nchpl 144 4773 0 3158 61 0 61 61 0 8 0 uvmvnodes 72 3305 0 0 61 0 61 61 0 8 0 vnodes 200 3305 0 0 174 0 174 174 0 8 0 namei 1024 13723 0 13723 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 13091 0 13091 11 8 3 6 0 8 3 sigapl 432 1083 0 1069 2 0 2 2 0 8 0 futexpl 56 10966 0 10964 1 0 1 1 0 8 0 knotepl 112 290 0 263 4 3 1 2 0 8 0 kqueuepl 104 279 0 277 1 0 1 1 0 8 0 pipepl 112 728 0 709 3 2 1 2 0 8 0 fdescpl 488 1084 0 1069 3 1 2 3 0 8 0 filepl 152 6785 0 6684 9 4 5 7 0 8 1 lockfpl 104 316 0 314 2 1 1 1 0 8 0 lockfspl 32 365 0 363 2 1 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 28 0 18 1 0 1 1 0 8 0 ucredpl 96 1839 0 1832 1 0 1 1 0 8 0 zombiepl 144 1069 0 1069 2 1 1 1 0 8 1 processpl 840 1099 0 1069 4 0 4 4 0 8 0 procpl 600 3134 0 3090 4 0 4 4 0 8 0 srpgc 64 6 0 6 1 1 0 1 0 8 0 sosppl 128 14 0 14 3 3 0 1 0 8 0 sockpl 384 958 0 939 3 0 3 3 0 8 1 mcl64k 65536 229 0 0 29 7 22 29 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 116 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 311 0 0 19 0 19 19 0 8 0 bufpl 256 6924 0 1020 369 0 369 369 0 8 0 anonpl 16 117403 0 109505 82 34 48 48 0 125 15 amapchunkpl 152 6462 0 6367 23 16 7 9 0 158 3 amappl16 192 5418 0 5000 66 37 29 33 0 8 8 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 4 0 4 2 2 0 1 0 8 0 amappl13 168 472 0 467 1 0 1 1 0 8 0 amappl12 160 13 0 11 1 0 1 1 0 8 0 amappl11 152 185 0 176 1 0 1 1 0 8 0 amappl10 144 518 0 513 2 1 1 1 0 8 0 amappl9 136 354 0 351 1 0 1 1 0 8 0 amappl8 128 148 0 130 1 0 1 1 0 8 0 amappl7 120 483 0 475 1 0 1 1 0 8 0 amappl6 112 55 0 47 1 0 1 1 0 8 0 amappl5 104 140 0 129 1 0 1 1 0 8 0 amappl4 96 270 0 248 1 0 1 1 0 8 0 amappl3 88 167 0 162 1 0 1 1 0 8 0 amappl2 80 9582 0 9520 2 0 2 2 0 8 0 amappl1 72 31949 0 31516 24 14 10 19 0 8 0 amappl 72 3361 0 3323 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 46 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1084 0 1069 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1084 0 1069 1 0 1 1 0 8 0 vmmpekpl 168 12448 0 12427 2 0 2 2 0 8 0 vmmpepl 168 122380 0 120931 114 40 74 74 0 357 10 vmsppl 360 1083 0 1069 2 0 2 2 0 8 0 pdppl 4096 2175 0 2138 6 1 5 6 0 8 0 pvpl 32 346994 0 336021 176 47 129 129 0 265 40 pmappl 224 1083 0 1069 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 557 0 10 16 0 16 16 0 8 0