panic: kqueue_scan:914: kq=0xfffffd806e8ee888 kn=0xfffffd806ebd9c40 knote !ACTIVE Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 405712 70323 0 0 0x4000000 0 syz-executor.0 *480274 70323 0 0 0x4000000 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c2b1a) at panic+0x15c sys/kern/subr_prf.c:207 kqueue_do_check(fffffd806e8ee888,ffffffff82212867,392) at kqueue_do_check+0x232 sys/kern/kern_event.c:622 kqueue_scan(fffffd806e8ee888,80,20000080,ffff800021bc4f30,ffff800020ac2288,ffff800021bc4f7c) at kqueue_scan+0x68c sys/kern/kern_event.c:915 sys_kevent(ffff800020ac2288,ffff800021bc4ff8,ffff800021bc5040) at sys_kevent+0x492 sys/kern/kern_event.c:604 syscall(ffff800021bc50c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021bc50c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a328a7a10, count: 8 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 kqueue_scan:914: kq=0xfffffd806e8ee888 kn=0xfffffd806ebd9c40 knote !ACTIVE ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c2b1a) at panic+0x15c sys/kern/subr_prf.c:207 kqueue_do_check(fffffd806e8ee888,ffffffff82212867,392) at kqueue_do_check+0x232 sys/kern/kern_event.c:622 kqueue_scan(fffffd806e8ee888,80,20000080,ffff800021bc4f30,ffff800020ac2288,ffff800021bc4f7c) at kqueue_scan+0x68c sys/kern/kern_event.c:915 sys_kevent(ffff800020ac2288,ffff800021bc4ff8,ffff800021bc5040) at sys_kevent+0x492 sys/kern/kern_event.c:604 syscall(ffff800021bc50c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021bc50c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a328a7a10, count: -7 ddb{1}> show registers rdi 0xffffffff82136d47 db_enter+0x17 rsi 0x26ff __ALIGN_SIZE+0x16ff rbp 0xffff800021bc4a40 rbx 0xffff800021bc4af0 rdx 0x2700 __ALIGN_SIZE+0x1700 rcx 0xffff800020d80000 rax 0xffff800020d80000 r8 0xffffffff81e4d88f kprintf+0x16f r9 0x1 r10 0x25 r11 0x341d32571fb474d5 r12 0x3000000008 r13 0xffff800021bc4a50 r14 0x100 r15 0x1 rip 0xffffffff82136d48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bc4a30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=480274 stat=onproc flags process=0 proc=4000000 pri=24, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac3398,0xffff800020ac3888 process=0xffff800020aa96a0 user=0xffff800021bc0000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70323 190309 41717 0 2 0 syz-executor.0 70323 405712 41717 0 7 0x4000000 syz-executor.0 *70323 480274 41717 0 7 0x4000000 syz-executor.0 14260 148907 48626 0 2 0 syz-executor.1 14260 497024 48626 0 3 0x4000080 fsleep syz-executor.1 14260 26411 48626 0 3 0x4000080 kqread syz-executor.1 64035 357540 1 0 3 0x80 nanosleep init 48626 257563 2116 0 2 0x2 syz-executor.1 81444 122378 0 0 3 0x14200 bored sosplice 41717 128699 2116 0 3 0x82 nanosleep syz-executor.0 2116 214760 21804 0 3 0x82 thrsleep syz-fuzzer 2116 250339 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 196304 21804 0 3 0x4000082 kqread syz-fuzzer 2116 4927 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 32031 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 355209 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 86334 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 86107 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 283099 21804 0 3 0x4000082 thrsleep syz-fuzzer 2116 442766 21804 0 3 0x4000082 thrsleep syz-fuzzer 21804 465083 40019 0 3 0x10008a pause ksh 40019 146273 50 0 3 0x92 select sshd 50 271203 1 0 3 0x80 select sshd 84019 218006 2472 74 3 0x100092 bpf pflogd 2472 107959 1 0 3 0x80 netio pflogd 82277 41302 68599 73 3 0x100090 kqread syslogd 68599 423575 1 0 3 0x100082 netio syslogd 2916 356242 1 77 3 0x100090 poll dhclient 32551 362156 1 0 3 0x80 poll dhclient 89655 408397 0 0 2 0x14200 zerothread 4424 503303 0 0 3 0x14200 aiodoned aiodoned 41037 449857 0 0 3 0x14200 syncer update 16940 230874 0 0 3 0x14200 cleaner cleaner 98914 171057 0 0 3 0x14200 reaper reaper 35435 37288 0 0 3 0x14200 pgdaemon pagedaemon 68055 74534 0 0 3 0x14200 bored crynlk 47393 25706 0 0 3 0x14200 bored crypto 28076 345458 0 0 3 0x40014200 acpi0 acpi0 90474 115664 0 0 3 0x40014200 idle1 20502 389498 0 0 3 0x14200 bored softnet 62562 383180 0 0 3 0x14200 bored systqmp 45386 106046 0 0 3 0x14200 bored systq 30629 285204 0 0 3 0x40014200 bored softclock 4321 486502 0 0 3 0x40014200 idle0 86693 284707 0 0 3 0x14200 bored smr 1 393304 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 70323 (syz-executor.0) thread 0xffff800020ac2288 (480274) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826494e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:439 #3 sleep_finish+0x113 sys/kern/kern_synch.c:415 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:444 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:206 #5 tsleep+0x1cc sys/kern/kern_synch.c:155 #6 kqueue_scan+0x399 sys/kern/kern_event.c:870 #7 sys_kevent+0x492 sys/kern/kern_event.c:604 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9510 6413K 7569K 78643K 13965 0 pcb 13 8K 8K 78643K 175 0 rtable 111 4K 4K 78643K 732 0 ifaddr 85 19K 20K 78643K 385 0 counters 43 33K 34K 78643K 157 0 ioctlops 0 0K 4K 78643K 1476 0 iov 0 0K 16K 78643K 165 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 2211 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 19 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 210 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 1919 0 sigio 0 0K 0K 78643K 112 0 proc 56 51K 95K 78643K 657 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 289 0 in_multi 95 4K 4K 78643K 209 0 ether_multi 1 0K 0K 78643K 31 0 mrt 0 0K 0K 78643K 48 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 470 0 pfkey data 0 0K 4K 78643K 10 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 107 22K 22K 78643K 5563 0 UVM aobj 11 2K 2K 78643K 15 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 146 0 NDP 11 0K 0K 78643K 74 0 temp 128 3022K 3086K 78643K 12703 0 kqueue 9 6K 54K 78643K 404 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 12 0 5 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 75 0 73 1 0 1 1 0 8 0 rtentry 112 81 0 37 2 0 2 2 0 8 0 unpcb 120 1077 0 1067 1 0 1 1 0 8 0 syncache 264 38 0 38 4 4 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 47 0 47 4 4 0 1 0 8 0 tcpcb 544 909 0 903 3 1 2 2 0 8 1 inpcb 280 1989 0 1980 5 2 3 3 0 8 1 rttmr 72 17 0 17 3 2 1 1 0 8 1 ip6q 72 4 0 4 1 1 0 1 0 8 0 ip6af 40 12 0 12 1 1 0 1 0 8 0 nd6 48 8 0 4 1 0 1 1 0 8 0 pkpcb 40 20 0 20 4 3 1 1 0 8 1 ppxss 1128 4 0 4 1 1 0 1 0 8 0 pffrag 232 18 0 18 2 2 0 1 0 482 0 pffrnode 88 18 0 18 2 2 0 1 0 8 0 pffrent 40 595 0 595 2 2 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 74 0 40 1 0 1 1 0 8 0 pfstkey 112 74 0 40 2 0 2 2 0 8 0 pfstate 328 74 0 40 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 429 0 203 17 2 15 16 0 8 0 art_table 32 431 0 203 2 0 2 2 0 8 0 art_node 16 80 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 38 1 0 1 1 0 8 0 semupl 112 7 0 7 1 1 0 1 0 8 0 semapl 112 206 0 196 1 0 1 1 0 8 0 shmpl 112 13 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4030 0 2624 46 0 46 46 0 8 0 ffsino 272 4030 0 2624 95 0 95 95 0 8 0 nchpl 144 6672 0 5067 62 1 61 61 0 8 0 uvmvnodes 72 4798 0 0 88 0 88 88 0 8 0 vnodes 208 4798 0 0 253 0 253 253 0 8 0 namei 1024 18299 0 18299 1 0 1 1 0 8 1 percpumem 16 89 0 57 1 0 1 1 0 8 0 scxspl 192 18552 0 18552 4 3 1 3 0 8 1 plimitpl 152 132 0 125 1 0 1 1 0 8 0 sigapl 432 2117 0 2101 3 1 2 3 0 8 0 futexpl 56 25674 0 25673 1 0 1 1 0 8 0 knotepl 112 633 0 611 2 1 1 2 0 8 0 kqueuepl 104 673 0 665 3 2 1 2 0 8 0 pipelkpl 48 367 0 355 1 0 1 1 0 8 0 pipepl 120 734 0 711 2 1 1 2 0 8 0 fdescpl 496 2118 0 2101 3 0 3 3 0 8 0 filepl 152 11384 0 11272 10 4 6 7 0 8 1 lockfpl 104 547 0 546 1 0 1 1 0 8 0 lockfspl 48 202 0 201 1 0 1 1 0 8 0 sessionpl 112 20 0 10 1 0 1 1 0 8 0 pgrppl 48 31 0 21 1 0 1 1 0 8 0 ucredpl 96 1428 0 1419 1 0 1 1 0 8 0 zombiepl 144 2101 0 2101 1 0 1 1 0 8 1 processpl 960 2134 0 2101 5 0 5 5 0 8 0 procpl 624 4696 0 4650 4 0 4 4 0 8 0 sosppl 128 13 0 13 2 2 0 1 0 8 0 sockpl 400 3186 0 3165 11 7 4 6 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 173 0 0 19 0 19 19 0 8 1 mtagpl 80 107 0 0 3 0 3 3 0 8 0 mbufpl 256 472 0 0 26 0 26 26 0 8 0 bufpl 280 6477 0 206 448 0 448 448 0 8 0 anonpl 16 150085 0 141927 39 6 33 36 0 125 0 amapchunkpl 152 8157 0 8040 7 1 6 7 0 158 0 amappl16 192 8803 0 8410 28 8 20 22 0 8 0 amappl15 184 61 0 58 1 0 1 1 0 8 0 amappl14 176 35 0 33 1 0 1 1 0 8 0 amappl12 160 944 0 937 1 0 1 1 0 8 0 amappl11 152 1010 0 992 1 0 1 1 0 8 0 amappl10 144 20 0 13 1 0 1 1 0 8 0 amappl9 136 613 0 610 1 0 1 1 0 8 0 amappl8 128 128 0 107 1 0 1 1 0 8 0 amappl7 120 113 0 101 1 0 1 1 0 8 0 amappl6 112 997 0 989 1 0 1 1 0 8 0 amappl5 104 1119 0 1101 1 0 1 1 0 8 0 amappl4 96 2377 0 2350 1 0 1 1 0 8 0 amappl3 88 171 0 164 1 0 1 1 0 8 0 amappl2 80 16029 0 15948 3 0 3 3 0 8 0 amappl1 72 46621 0 46175 26 16 10 21 0 8 0 amappl 80 4962 0 4919 1 0 1 1 0 84 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 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 64 14 0 4 1 0 1 1 0 8 0 uaddrrnd 24 2118 0 2101 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2118 0 2101 1 0 1 1 0 8 0 vmmpekpl 168 14276 0 14240 2 0 2 2 0 8 0 vmmpepl 168 246692 0 245042 96 23 73 82 0 357 1 vmsppl 368 2117 0 2101 2 0 2 2 0 8 0 pdppl 4096 4243 0 4202 6 0 6 6 0 8 0 pvpl 32 612497 0 601172 147 51 96 118 0 265 3 pmappl 232 2117 0 2101 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 202 0 13 6 0 6 6 0 8 0