panic: pool_p_free: pvpl free list modified: page 0xfffffd805398b000; item addr 0xfffffd805398b000; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *204593 40081 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82434318) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82816b80,fffffd805398bf90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff826bf4e0) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: 10 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic pool_p_free: pvpl free list modified: page 0xfffffd805398b000; item addr 0xfffffd805398b000; offset 0x0=0x0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82434318) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82816b80,fffffd805398bf90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff826bf4e0) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d6721f0 rbx 0xffff80001d6722a0 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff822352af kprintf+0x15f r9 0x1 r10 0x2 r11 0x981937187245c640 r12 0x3000000008 r13 0xffff80001d672200 r14 0x100 r15 0x1 rip 0xffffffff81c03b08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d6721e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=204593 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d651000,0xffff80001d6514f0 process=0xffff8000ffffe000 user=0xffff80001d66d000, vmspace=0xffffffff82807898 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 21624 31099 0 0 3 0x14280 nfsidl nfsio 39591 82173 0 0 3 0x14280 nfsidl nfsio 57508 360936 0 0 3 0x14280 nfsidl nfsio 27450 260434 0 0 3 0x14280 nfsidl nfsio 36568 142218 0 0 3 0x14280 nfsidl nfsio 26869 311922 0 0 3 0x14280 nfsidl nfsio 35365 99475 0 0 3 0x14280 nfsidl nfsio 92620 227439 0 0 3 0x14280 nfsidl nfsio 17198 81671 0 0 3 0x14280 nfsidl nfsio 43221 170924 0 0 3 0x14280 nfsidl nfsio 57456 516459 0 0 3 0x14280 nfsidl nfsio 36749 332995 0 0 3 0x14280 nfsidl nfsio 39906 508759 0 0 3 0x14280 nfsidl nfsio 24133 300000 0 0 3 0x14280 nfsidl nfsio 55111 402921 0 0 3 0x14280 nfsidl nfsio 3861 163450 0 0 3 0x14280 nfsidl nfsio 9633 492461 0 0 3 0x14280 nfsidl nfsio 31024 198043 0 0 3 0x14280 nfsidl nfsio 25516 422689 0 0 3 0x14280 nfsidl nfsio 22394 388562 0 0 3 0x14280 nfsidl nfsio 62220 467212 0 0 3 0x14200 bored sosplice 35916 251194 94525 0 3 0x82 wait syz-executor.1 80061 393699 94525 0 3 0x82 piperd syz-executor.0 94525 458517 11919 0 3 0x82 kqread syz-fuzzer 94525 302590 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 354368 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 383772 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 305894 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 443186 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 48347 11919 0 3 0x4000082 thrsleep syz-fuzzer 94525 156085 11919 0 3 0x4000082 thrsleep syz-fuzzer 11919 96210 38802 0 3 0x10008a pause ksh 38802 482709 70981 0 3 0x92 select sshd 23160 181782 1 0 3 0x100083 ttyin getty 70981 78644 1 0 3 0x80 select sshd 24443 245065 23157 73 3 0x100090 kqread syslogd 23157 378449 1 0 3 0x100082 netio syslogd 4037 42495 1 77 3 0x100090 poll dhclient 93242 495761 1 0 3 0x80 poll dhclient 18835 231096 0 0 3 0x14200 bored smr 17442 262540 0 0 2 0x14200 zerothread 34745 10159 0 0 3 0x14200 aiodoned aiodoned 62439 486397 0 0 3 0x14200 syncer update 20997 502303 0 0 3 0x14200 cleaner cleaner 37852 121040 0 0 3 0x14200 reaper reaper 6190 155043 0 0 3 0x14200 pgdaemon pagedaemon 79291 130995 0 0 3 0x14200 bored crynlk 45624 124685 0 0 3 0x14200 bored crypto 85053 411716 0 0 3 0x40014200 acpi0 acpi0 85553 346219 0 0 3 0x14200 bored softnet *40081 204593 0 0 7 0x14200 systqmp 6325 165296 0 0 3 0x14200 bored systq 19292 31040 0 0 3 0x40014200 bored softclock 71641 169694 0 0 3 0x40014200 idle0 1 155691 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9498 6350K 7248K 78643K 11976 0 pcb 13 8K 8K 78643K 83 0 rtable 128 7K 8K 78643K 511 0 ifaddr 86 18K 18K 78643K 207 0 counters 21 16K 16K 78643K 29 0 ioctlops 0 0K 4K 78643K 75 0 iov 0 0K 16K 78643K 149 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1572 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 63 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 5 13K 25K 78643K 328 0 sigio 0 0K 0K 78643K 5 0 proc 49 38K 63K 78643K 384 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 23 0 in_multi 71 3K 3K 78643K 102 0 ether_multi 1 0K 0K 78643K 10 0 mrt 0 0K 0K 78643K 4 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 215 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 141 88K 93K 78643K 1672 0 UVM aobj 17 2K 2K 78643K 20 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 47 0 NDP 11 0K 0K 78643K 23 0 temp 103 3858K 3922K 78643K 19549 0 kqueue 3 4K 12K 78643K 21 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 11 0 4 1 0 1 1 0 8 0 rtpcb 80 31 0 29 1 0 1 1 0 8 0 rtentry 112 57 0 11 2 0 2 2 0 8 0 unpcb 120 123 0 115 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 260 0 260 1 1 0 1 0 8 0 tcpcb 544 234 0 230 1 0 1 1 0 8 0 ipq 40 2 0 2 2 2 0 1 0 8 0 ipqe 40 47 0 47 2 2 0 1 0 8 0 inpcb 296 447 0 438 3 2 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 swfcl 56 1 0 0 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 105 0 96 1 0 1 1 0 8 0 pftag 88 23 0 20 1 0 1 1 0 8 0 pfrule 1360 20 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 203 0 5 13 0 13 13 0 8 0 art_table 32 204 0 5 2 0 2 2 0 8 0 art_node 16 56 0 15 1 0 1 1 0 8 0 semapl 112 61 0 51 1 0 1 1 0 8 0 shmpl 112 18 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1865 0 466 88 0 88 88 0 8 0 ffsino 240 1865 0 466 83 0 83 83 0 8 0 nchpl 144 2578 0 985 60 0 60 60 0 8 0 uvmvnodes 72 2203 0 0 41 0 41 41 0 8 0 vnodes 208 2203 0 0 116 0 116 116 0 8 0 namei 1024 7156 0 7156 1 1 0 1 0 8 0 vcpupl 1984 9 0 0 2 0 2 2 0 8 0 vmpool 528 11 0 2 1 0 1 1 0 8 0 pfiaddrpl 120 38 0 30 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 7782 0 7782 1 0 1 1 0 8 1 plimitpl 152 40 0 33 1 0 1 1 0 8 0 sigapl 424 535 0 486 6 0 6 6 0 8 0 futexpl 56 7648 0 7648 1 1 0 1 0 8 0 knotepl 112 83 0 64 1 0 1 1 0 8 0 kqueuepl 144 54 0 52 1 0 1 1 0 8 0 pipelkpl 16 118 0 108 1 0 1 1 0 8 0 pipepl 120 236 0 217 1 0 1 1 0 8 0 fdescpl 432 500 0 486 2 0 2 2 0 8 0 filepl 120 3306 0 3208 4 0 4 4 0 8 0 lockfpl 104 450 0 449 1 0 1 1 0 8 0 lockfspl 48 210 0 209 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 359 0 352 1 0 1 1 0 8 0 zombiepl 144 487 0 486 1 0 1 1 0 8 0 processpl 920 535 0 486 7 0 7 7 0 8 0 procpl 624 932 0 876 5 0 5 5 0 8 0 sosppl 128 4 0 4 1 1 0 1 0 8 0 sockpl 400 602 0 583 4 1 3 4 0 8 0 mcl64k 65536 282 0 282 33 25 8 33 0 8 8 mcl16k 16384 4 0 4 2 2 0 1 0 8 0 mcl12k 12288 5 0 5 2 2 0 1 0 8 0 mcl9k 9216 6 0 6 2 2 0 1 0 8 0 mcl8k 8192 18 0 18 1 1 0 1 0 8 0 mcl4k 4096 43 0 43 3 3 0 1 0 8 0 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 73972 0 73916 20 12 8 18 0 8 0 mtagpl 96 215 0 6 7 1 6 6 0 8 0 mbufpl 256 120115 0 119597 49 11 38 42 0 8 5 bufpl 280 4265 0 144 295 0 295 295 0 8 0 anonpl 16 63043 0 46720 81 13 68 80 0 107 0 amapchunkpl 152 2736 0 2604 21 14 7 19 0 158 1 amappl16 192 2479 0 1562 56 9 47 56 0 8 0 amappl15 184 9 0 7 1 0 1 1 0 8 0 amappl14 176 172 0 168 1 0 1 1 0 8 0 amappl13 168 28 0 24 1 0 1 1 0 8 0 amappl12 160 162 0 159 1 0 1 1 0 8 0 amappl11 152 49 0 40 1 0 1 1 0 8 0 amappl10 144 15 0 9 1 0 1 1 0 8 0 amappl9 136 519 0 516 1 0 1 1 0 8 0 amappl8 128 469 0 429 2 0 2 2 0 8 0 amappl7 120 105 0 93 1 0 1 1 0 8 0 amappl6 112 24 0 19 1 0 1 1 0 8 0 amappl5 104 446 0 433 1 0 1 1 0 8 0 amappl4 96 433 0 401 1 0 1 1 0 8 0 amappl3 88 113 0 107 1 0 1 1 0 8 0 amappl2 80 3302 0 3237 2 0 2 2 0 8 0 amappl1 72 18276 0 17853 24 15 9 17 0 8 0 amappl 80 1169 0 1123 2 1 1 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 19 0 3 1 0 1 1 0 8 0 uaddrrnd 24 511 0 488 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 511 0 488 1 0 1 1 0 8 0 vmmpekpl 168 7138 0 7102 2 0 2 2 0 8 0 vmmpepl 168 65864 0 63826 119 25 94 113 0 357 0 vmsppl 272 510 0 488 2 0 2 2 0 8 0 pdppl 4096 1028 0 985 7 1 6 6 0 8 0 pvpl 32 193210 0 173794 188 15 173 188 0 265 15 pmappl 200 510 0 488 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 319 0 59 9 0 9 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82434318) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82816b80,fffffd805398bf90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff826bf4e0) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: -5 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82434318) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82816b80,fffffd805398bf90) at pool_p_free+0x1de sys/kern/subr_pool.c:983 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1578 taskq_thread(ffffffff826bf4e0) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: -5