panic: kqueue_scan:879: kq=0xfffffd8070e7fe38 kn=0xfffffd806eb3f000 knote !ACTIVE Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 78370 55879 0 0 0x4000000 1K syz-executor.1 185309 67480 0 0x2 0x480 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c296c) at panic+0x15c sys/kern/subr_prf.c:207 kqueue_do_check(fffffd8070e7fe38,ffffffff82211dae,36f) at kqueue_do_check+0x232 sys/kern/kern_event.c:587 kqueue_scan(fffffd8070e7fe38,7e,0,0,ffff800020ad6018,ffff800021ba172c) at kqueue_scan+0x68c sys/kern/kern_event.c:880 sys_kevent(ffff800020ad6018,ffff800021ba17a8,ffff800021ba17f0) at sys_kevent+0x48b sys/kern/kern_event.c:569 syscall(ffff800021ba1870) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021ba1870) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fbaac0d980, 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:879: kq=0xfffffd8070e7fe38 kn=0xfffffd806eb3f000 knote !ACTIVE ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c296c) at panic+0x15c sys/kern/subr_prf.c:207 kqueue_do_check(fffffd8070e7fe38,ffffffff82211dae,36f) at kqueue_do_check+0x232 sys/kern/kern_event.c:587 kqueue_scan(fffffd8070e7fe38,7e,0,0,ffff800020ad6018,ffff800021ba172c) at kqueue_scan+0x68c sys/kern/kern_event.c:880 sys_kevent(ffff800020ad6018,ffff800021ba17a8,ffff800021ba17f0) at sys_kevent+0x48b sys/kern/kern_event.c:569 syscall(ffff800021ba1870) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021ba1870) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fbaac0d980, count: -7 ddb{1}> show registers rdi 0xffffffff81181907 db_enter+0x17 rsi 0x2a77 __ALIGN_SIZE+0x1a77 rbp 0xffff800021ba11f0 rbx 0xffff800021ba12a0 rdx 0x2a78 __ALIGN_SIZE+0x1a78 rcx 0xffff800022d9a000 rax 0xffff800022d9a000 r8 0xffffffff81e1f45f kprintf+0x16f r9 0x1 r10 0x25 r11 0x22d115ca247af452 r12 0x3000000008 r13 0xffff800021ba1200 r14 0x100 r15 0x1 rip 0xffffffff81181908 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021ba11e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=78370 stat=onproc flags process=0 proc=4000000 pri=24, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad6290,0xffff800020ad78d8 process=0xffff800020af5548 user=0xffff800021b9c000, 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 55879 431531 64348 0 2 0 syz-executor.1 *55879 78370 64348 0 7 0x4000000 syz-executor.1 55879 320271 64348 0 2 0x4000000 syz-executor.1 64348 474796 33720 0 2 0x482 syz-executor.1 67480 185309 33720 0 7 0x482 syz-executor.0 33720 260543 23198 0 3 0x82 thrsleep syz-fuzzer 33720 489781 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 78200 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 161965 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 141384 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 519581 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 512695 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 158384 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 404889 23198 0 3 0x4000082 thrsleep syz-fuzzer 33720 142332 23198 0 3 0x4000082 kqread syz-fuzzer 23198 130020 92876 0 3 0x10008a pause ksh 92876 250118 80233 0 3 0x92 select sshd 2803 514016 1 0 3 0x100083 ttyin getty 80233 134070 1 0 3 0x80 select sshd 6265 86694 12830 74 3 0x100092 bpf pflogd 12830 20143 1 0 3 0x80 netio pflogd 8548 41518 81326 73 3 0x100090 kqread syslogd 81326 371028 1 0 3 0x100082 netio syslogd 49434 416768 1 77 3 0x100090 poll dhclient 50265 99865 1 0 3 0x80 poll dhclient 67315 78448 0 0 3 0x14200 pgzero zerothread 97953 95074 0 0 3 0x14200 aiodoned aiodoned 96855 294954 0 0 3 0x14200 syncer update 89919 247955 0 0 3 0x14200 cleaner cleaner 93711 152504 0 0 3 0x14200 reaper reaper 55507 249189 0 0 3 0x14200 pgdaemon pagedaemon 56428 152767 0 0 3 0x14200 bored crynlk 32059 104193 0 0 3 0x14200 bored crypto 40733 73955 0 0 3 0x40014200 acpi0 acpi0 29528 376208 0 0 3 0x40014200 idle1 92462 411510 0 0 3 0x14200 bored softnet 11034 332684 0 0 3 0x14200 bored systqmp 52432 340688 0 0 3 0x14200 bored systq 71296 506974 0 0 3 0x40014200 bored softclock 95824 226795 0 0 3 0x40014200 idle0 44803 359507 0 0 3 0x14200 bored smr 1 133455 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 55879 (syz-executor.1) thread 0xffff800020ad6018 (78370) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82655c30) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:434 #3 sleep_finish+0x113 sys/kern/kern_synch.c:388 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:417 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:183 #5 tsleep+0x1cc sys/kern/kern_synch.c:153 #6 kqueue_scan+0x326 sys/kern/kern_event.c:835 #7 sys_kevent+0x48b sys/kern/kern_event.c:569 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9473 6406K 6415K 78643K 11402 0 pcb 16 8K 9K 78643K 7403 0 rtable 105 3K 3K 78643K 203 0 ifaddr 44 10K 10K 78643K 45 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 2091 0 iov 0 0K 12K 78643K 208 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1851 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 584 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 761 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 10467 0 sigio 0 0K 0K 78643K 274 0 proc 60 63K 83K 78643K 439 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 207 0 pfkey data 0 0K 1K 78643K 7 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 120 70K 70K 78643K 23636 0 UVM aobj 130 4K 4K 78643K 130 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 17 0 NDP 6 0K 0K 78643K 10 0 temp 111 3026K 3090K 78643K 25172 0 kqueue 1 0K 0K 78643K 43 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 10737 0 10727 5 4 1 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 544 135 0 131 1 0 1 1 0 8 0 inpcb 280 7646 0 7636 15 13 2 3 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 1 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 11 0 9 1 0 1 1 0 8 0 pfstkey 112 11 0 9 1 0 1 1 0 8 0 pfstate 328 11 0 9 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 133 0 133 4 4 0 1 0 8 0 semapl 112 759 0 749 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 12073 0 10665 46 0 46 46 0 8 0 ffsino 272 12073 0 10665 95 0 95 95 0 8 0 nchpl 144 24439 0 22827 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 67354 0 67354 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 6 0 1 1 0 1 1 0 8 0 vmpool 560 43 0 38 1 0 1 1 0 8 0 scxspl 192 67873 0 67873 8 7 1 7 0 8 1 plimitpl 152 64 0 56 1 0 1 1 0 8 0 sigapl 432 10666 0 10651 3 1 2 3 0 8 0 futexpl 56 75510 0 75510 1 0 1 1 0 8 1 knotepl 112 189 0 169 1 0 1 1 0 8 0 kqueuepl 104 341 0 338 1 0 1 1 0 8 0 pipepl 112 3826 0 3807 1 0 1 1 0 8 0 fdescpl 488 10667 0 10651 3 0 3 3 0 8 0 filepl 152 50796 0 50692 13 8 5 6 0 8 1 lockfpl 104 1002 0 1001 1 0 1 1 0 8 0 lockfspl 48 462 0 461 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 177 0 166 1 0 1 1 0 8 0 ucredpl 96 6324 0 6315 1 0 1 1 0 8 0 zombiepl 144 10651 0 10650 1 0 1 1 0 8 0 processpl 904 10682 0 10650 4 0 4 4 0 8 0 procpl 632 22774 0 22731 8 4 4 5 0 8 0 sockpl 384 18681 0 18659 22 18 4 6 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 21 0 0 2 1 1 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 143 0 0 14 2 12 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 361 0 0 12 0 12 12 0 8 0 bufpl 280 16711 0 9641 506 0 506 506 0 8 0 anonpl 16 626834 0 622530 39 10 29 35 0 125 10 amapchunkpl 152 35984 0 35888 19 14 5 18 0 158 0 amappl16 192 45735 0 45532 26 14 12 22 0 8 1 amappl15 184 60 0 56 1 0 1 1 0 8 0 amappl14 176 36 0 33 1 0 1 1 0 8 0 amappl12 160 18 0 16 1 0 1 1 0 8 0 amappl11 152 63 0 48 1 0 1 1 0 8 0 amappl10 144 5272 0 5265 1 0 1 1 0 8 0 amappl9 136 5780 0 5776 1 0 1 1 0 8 0 amappl8 128 5344 0 5318 1 0 1 1 0 8 0 amappl7 120 5356 0 5344 1 0 1 1 0 8 0 amappl6 112 55 0 50 1 0 1 1 0 8 0 amappl5 104 211 0 195 1 0 1 1 0 8 0 amappl4 96 10962 0 10932 1 0 1 1 0 8 0 amappl3 88 1133 0 1125 1 0 1 1 0 8 0 amappl2 80 84586 0 84510 3 1 2 3 0 8 0 amappl1 72 183787 0 183342 24 14 10 20 0 8 0 amappl 80 23025 0 22981 3 1 2 2 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 64 129 0 0 3 0 3 3 0 8 0 uaddrrnd 24 10710 0 10689 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10710 0 10689 1 0 1 1 0 8 0 vmmpekpl 168 48342 0 48308 3 1 2 2 0 8 0 vmmpepl 168 1191954 0 1190572 107 37 70 82 0 357 7 vmsppl 368 10709 0 10689 3 1 2 3 0 8 0 pdppl 4096 21427 0 21383 6 0 6 6 0 8 0 pvpl 32 1914199 0 1906688 178 82 96 118 0 265 33 pmappl 232 10709 0 10689 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 168 0 6 5 0 5 5 0 8 0