panic: timeout_add: to_ticks (-1828216986) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 466826 45312 0 0 0 0 syz-executor.1 * 66535 45312 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(ffff80000066d060,93079f66) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,718d52fb,93079f66,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c3b140,2,ffff800020b42e28) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c3b140,2,ffff800020b42e28) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8075d57800,20005302,ffff800020c3b140,2,fffffd807f7c7a80,ffff800020b42e28) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80682209a0,20005302,ffff800020c3b140,ffff800020b42e28) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42e28,ffff800020c3b288,ffff800020c3b270) at sys_ioctl+0x646 syscall(ffff800020c3b320) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c3b320) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,8b326560010) at Xsyscall+0x128 end of kernel end trace frame: 0x8b55c65e100, 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 (-1828216986) < 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(ffff80000066d060,93079f66) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,718d52fb,93079f66,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c3b140,2,ffff800020b42e28) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c3b140,2,ffff800020b42e28) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd8075d57800,20005302,ffff800020c3b140,2,fffffd807f7c7a80,ffff800020b42e28) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80682209a0,20005302,ffff800020c3b140,ffff800020b42e28) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42e28,ffff800020c3b288,ffff800020c3b270) at sys_ioctl+0x646 syscall(ffff800020c3b320) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c3b320) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,8b326560010) at Xsyscall+0x128 end of kernel end trace frame: 0x8b55c65e100, count: -10 ddb{1}> show registers rdi 0xffffffff816f6437 db_enter+0x17 rsi 0x16ff __ALIGN_SIZE+0x6ff rbp 0xffff800020c3ad60 rbx 0xffff800020c3ae10 rdx 0x1700 __ALIGN_SIZE+0x700 rcx 0xffff800002b4a000 rax 0xffff800002b4a000 r8 0xffffffff81555b63 kprintf+0x183 r9 0x1 r10 0x25 r11 0x94c843dff587d789 r12 0x3000000008 r13 0xffff800020c3ad70 r14 0x100 r15 0x1 rip 0xffffffff816f6438 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c3ad50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=66535 stat=onproc flags process=0 proc=4000000 pri=69, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff800020b439e0,0xffffffff823128d8 process=0xffff800020b453c0 user=0xffff800020c36000, vmspace=0xfffffd807f00c9d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45312 466826 42334 0 7 0 syz-executor.1 *45312 66535 42334 0 7 0x4000000 syz-executor.1 24176 303563 89697 0 2 0 syz-executor.0 24176 22779 89697 0 2 0x4000000 syz-executor.0 81397 319809 0 0 3 0x14200 bored sosplice 42334 32714 97199 0 3 0x82 nanosleep syz-executor.1 89697 121586 97199 0 3 0x82 nanosleep syz-executor.0 97199 162700 56116 0 3 0x82 thrsleep syz-fuzzer 97199 352444 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 376226 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 460057 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 416414 56116 0 3 0x4000082 kqread syz-fuzzer 97199 71164 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 506059 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 148763 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 301584 56116 0 3 0x4000082 thrsleep syz-fuzzer 97199 303657 56116 0 3 0x4000082 thrsleep syz-fuzzer 56116 329424 23730 0 3 0x10008a pause ksh 23730 440922 51258 0 3 0x92 select sshd 75303 489746 1 0 3 0x100083 ttyin getty 51258 154642 1 0 3 0x80 select sshd 98980 31770 97337 73 3 0x100090 kqread syslogd 97337 456890 1 0 3 0x100082 netio syslogd 47890 102376 1 77 3 0x100090 poll dhclient 51600 84684 1 0 3 0x80 poll dhclient 81439 105715 0 0 2 0x14200 zerothread 5690 115904 0 0 3 0x14200 aiodoned aiodoned 35124 25181 0 0 3 0x14200 syncer update 33977 363054 0 0 3 0x14200 cleaner cleaner 21116 486363 0 0 3 0x14200 reaper reaper 74454 431819 0 0 3 0x14200 pgdaemon pagedaemon 84328 418010 0 0 3 0x14200 bored crynlk 37876 18624 0 0 3 0x14200 bored crypto 53594 475295 0 0 3 0x40014200 acpi0 acpi0 23828 410316 0 0 3 0x40014200 idle1 95088 245076 0 0 3 0x14200 bored softnet 10670 25365 0 0 3 0x14200 bored systqmp 2634 512209 0 0 3 0x14200 bored systq 19621 276294 0 0 3 0x40014200 bored softclock 24267 252966 0 0 3 0x40014200 idle0 1 256171 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 45312 (syz-executor.1) thread 0xffff800020b42e28 (66535) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823174f8) locked @ /syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/trap.c:161 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9469 6332K 6347K 78643K 10615 0 0 pcb 23 9K 11K 78643K 165 0 0 rtable 100 3K 4K 78643K 192 0 0 ifaddr 39 10K 11K 78643K 50 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 12K 78643K 10 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 75K 78643K 1283 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 5 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 201 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 348 0 0 proc 41 38K 70K 78643K 263 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 17 0 0 in_multi 33 2K 2K 78643K 36 0 0 ether_multi 1 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 185 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 80 20K 20K 78643K 1651 0 0 UVM aobj 7 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 0K 78643K 13 0 0 NDP 6 0K 0K 78643K 13 0 0 temp 92 2357K 2427K 78643K 3553 0 0 kqueue 0 0K 0K 78643K 1 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 280 287 0 279 2 1 1 2 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 58 0 54 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 1 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 2 0 0 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 193 0 183 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1884 0 480 46 0 46 46 0 8 0 ffsino 272 1884 0 480 94 0 94 94 0 8 0 nchpl 144 2871 0 1247 61 0 61 61 0 8 0 uvmvnodes 72 1945 0 0 36 0 36 36 0 8 0 vnodes 200 1945 0 0 103 0 103 103 0 8 0 namei 1024 6728 0 6728 1 0 1 1 0 8 1 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 6298 0 6298 7 6 1 6 0 8 1 sigapl 432 516 0 502 2 0 2 2 0 8 0 futexpl 56 4600 0 4600 1 0 1 1 0 8 1 knotepl 112 123 0 96 3 1 2 2 0 8 1 kqueuepl 104 58 0 56 1 0 1 1 0 8 0 pipepl 112 888 0 867 1 0 1 1 0 8 0 fdescpl 488 517 0 502 3 1 2 3 0 8 0 filepl 152 3086 0 2985 6 1 5 5 0 8 1 lockfpl 104 39 0 37 2 1 1 1 0 8 0 lockfspl 32 40 0 38 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 261 0 254 1 0 1 1 0 8 0 zombiepl 144 502 0 502 1 0 1 1 0 8 1 processpl 840 532 0 502 4 0 4 4 0 8 0 procpl 600 1087 0 1046 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 384 421 0 403 4 1 3 4 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 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 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k 2048 107 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 123 0 0 8 0 8 8 0 8 0 bufpl 256 5622 0 1013 289 0 289 289 0 8 0 anonpl 16 50082 0 42082 46 1 45 45 0 125 12 amapchunkpl 152 2134 0 2047 6 1 5 6 0 158 0 amappl16 192 2264 0 1834 32 3 29 32 0 8 7 amappl15 184 196 0 194 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 12 0 11 2 1 1 1 0 8 0 amappl11 152 178 0 169 1 0 1 1 0 8 0 amappl10 144 57 0 54 1 0 1 1 0 8 0 amappl9 136 352 0 347 1 0 1 1 0 8 0 amappl8 128 132 0 116 1 0 1 1 0 8 0 amappl7 120 42 0 35 1 0 1 1 0 8 0 amappl6 112 54 0 47 1 0 1 1 0 8 0 amappl5 104 319 0 307 1 0 1 1 0 8 0 amappl4 96 400 0 378 1 0 1 1 0 8 0 amappl3 88 132 0 127 1 0 1 1 0 8 0 amappl2 80 3936 0 3874 2 0 2 2 0 8 0 amappl1 72 19125 0 18696 24 14 10 19 0 8 0 amappl 72 1289 0 1255 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 1 1 0 1 1 0 8 0 uaddrrnd 24 517 0 502 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 517 0 502 1 0 1 1 0 8 0 vmmpekpl 168 8628 0 8608 2 0 2 2 0 8 0 vmmpepl 168 60182 0 58737 89 17 72 72 0 357 9 vmsppl 360 516 0 502 2 0 2 2 0 8 0 pdppl 4096 1041 0 1004 6 1 5 6 0 8 0 pvpl 32 168102 0 157050 126 8 118 118 0 265 28 pmappl 224 516 0 502 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 436 0 3 13 0 13 13 0 8 0