panic: pool_p_free: pvpl free list modified: page 0xfffffd80687de000; item addr 0xfffffd80687de010; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *443178 21547 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8245935b) at panic+0x164 sys/kern/subr_prf.c:218 pool_p_free(ffffffff82858d80,fffffd80687def90) 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(ffffffff826d2750) 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 0xfffffd80687de000; item addr 0xfffffd80687de010; offset 0x0=0x0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8245935b) at panic+0x164 sys/kern/subr_prf.c:218 pool_p_free(ffffffff82858d80,fffffd80687def90) 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(ffffffff826d2750) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d672760 rbx 0xffff80001d672810 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff80001d672720 r9 0xffffffff8203e52f kprintf+0x15f r10 0x1 r11 0x91b98ee8e98c4207 r12 0x3000000008 r13 0xffff80001d672770 r14 0x100 r15 0x1 rip 0xffffffff81989c28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d672750 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=443178 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d652110,0xffff80001d651760 process=0xffff8000ffffe000 user=0xffff80001d66d000, vmspace=0xffffffff8284d990 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 24156 193531 47234 0 2 0 syz-executor.0 24156 462321 47234 0 2 0x4000000 syz-executor.0 24156 56001 47234 0 3 0x4000080 fsleep syz-executor.0 29029 221609 0 0 3 0x14280 nfsidl nfsio 80182 57985 0 0 3 0x14280 nfsidl nfsio 18769 450475 0 0 3 0x14280 nfsidl nfsio 39621 153613 0 0 3 0x14280 nfsidl nfsio 49804 436987 0 0 3 0x14280 nfsidl nfsio 22929 159896 0 0 3 0x14280 nfsidl nfsio 45008 165302 0 0 3 0x14280 nfsidl nfsio 81345 95862 0 0 3 0x14280 nfsidl nfsio 90935 309832 0 0 3 0x14280 nfsidl nfsio 59644 158627 0 0 3 0x14280 nfsidl nfsio 80558 170913 0 0 3 0x14280 nfsidl nfsio 8722 89516 0 0 3 0x14280 nfsidl nfsio 85743 54543 0 0 3 0x14280 nfsidl nfsio 4300 219069 0 0 3 0x14280 nfsidl nfsio 61550 115475 0 0 3 0x14280 nfsidl nfsio 55861 329906 0 0 3 0x14280 nfsidl nfsio 85950 73787 0 0 3 0x14280 nfsidl nfsio 85980 24085 0 0 3 0x14280 nfsidl nfsio 96303 298795 0 0 3 0x14280 nfsidl nfsio 77482 469055 0 0 3 0x14280 nfsidl nfsio 32740 155910 0 0 3 0x14200 bored sosplice 53091 382311 45619 0 3 0x82 piperd syz-executor.1 47234 323206 45619 0 2 0x482 syz-executor.0 45619 393226 39718 0 3 0x82 thrsleep syz-fuzzer 45619 46109 39718 0 2 0x4000482 syz-fuzzer 45619 307552 39718 0 3 0x4000082 thrsleep syz-fuzzer 45619 146732 39718 0 3 0x4000082 thrsleep syz-fuzzer 45619 317151 39718 0 3 0x4000082 thrsleep syz-fuzzer 45619 86889 39718 0 2 0x4000002 syz-fuzzer 45619 331000 39718 0 3 0x4000082 thrsleep syz-fuzzer 39718 488038 24306 0 3 0x10008a pause ksh 24306 291040 71779 0 3 0x92 select sshd 94205 107339 1 0 3 0x100083 ttyin getty 71779 190783 1 0 3 0x80 select sshd 41911 18063 57170 73 3 0x100090 kqread syslogd 57170 285325 1 0 3 0x100082 netio syslogd 52789 26791 1 77 3 0x100090 poll dhclient 67345 320387 1 0 3 0x80 poll dhclient 85058 402326 0 0 3 0x14200 bored smr 22363 230932 0 0 2 0x14200 zerothread 25362 424066 0 0 3 0x14200 aiodoned aiodoned 63544 338296 0 0 2 0x14200 update 50296 104721 0 0 3 0x14200 cleaner cleaner 11225 17767 0 0 3 0x14200 reaper reaper 30534 432103 0 0 3 0x14200 pgdaemon pagedaemon 69229 496875 0 0 3 0x14200 bored crynlk 18975 219473 0 0 3 0x14200 bored crypto 97761 373174 0 0 3 0x40014200 acpi0 acpi0 52160 290549 0 0 3 0x14200 bored softnet *21547 443178 0 0 7 0x14200 systqmp 77185 516462 0 0 3 0x14200 bored systq 69621 461544 0 0 2 0x40014200 softclock 47873 387232 0 0 3 0x40014200 idle0 1 33319 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 9485 6337K 6915K 78643K 11301 0 pcb 13 8K 8K 78643K 102 0 rtable 73 6K 8K 78643K 623 0 ifaddr 68 14K 16K 78643K 229 0 counters 20 16K 16K 78643K 29 0 ioctlops 0 0K 4K 78643K 121 0 iov 0 0K 16K 78643K 46 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1442 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 17 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 150 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 5 13K 25K 78643K 591 0 sigio 0 0K 0K 78643K 7 0 proc 49 38K 63K 78643K 412 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 41 0 in_multi 42 2K 3K 78643K 142 0 ether_multi 1 0K 0K 78643K 16 0 mrt 2 0K 0K 78643K 13 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 201 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 126 22K 38K 78643K 2288 0 UVM aobj 29 7K 7K 78643K 35 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 84 0 NDP 10 0K 0K 78643K 34 0 temp 111 3864K 3928K 78643K 4270 0 kqueue 3 4K 8K 78643K 15 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 6 0 4 1 0 1 1 0 8 0 rtpcb 80 39 0 37 1 0 1 1 0 8 0 rtentry 112 76 0 59 2 0 2 2 0 8 0 unpcb 120 319 0 311 1 0 1 1 0 8 0 syncache 264 7 0 7 3 3 0 1 0 8 0 tcpqe 32 159 0 159 1 1 0 1 0 8 0 tcpcb 544 689 0 684 8 7 1 4 0 8 0 ipq 40 3 0 3 2 2 0 1 0 8 0 ipqe 40 8 0 8 2 2 0 1 0 8 0 inpcb 296 1024 0 1016 5 4 1 2 0 8 0 rttmr 72 4 0 4 2 2 0 1 0 8 0 nd6 48 18 0 17 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1136 1 0 1 1 1 0 1 0 8 0 pfrktable 1344 126 0 118 1 0 1 1 0 8 0 pftag 88 36 0 34 4 3 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 112 2 0 1 1 0 1 1 0 8 0 pfstate 328 2 0 1 1 0 1 1 0 8 0 pfrule 1360 44 0 30 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 451 0 354 15 2 13 15 0 8 1 art_table 32 452 0 354 2 0 2 2 0 8 0 art_node 16 75 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 148 0 138 1 0 1 1 0 8 0 shmpl 112 32 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2128 0 735 88 0 88 88 0 8 0 ffsino 240 2128 0 735 83 0 83 83 0 8 0 nchpl 144 3109 0 1521 60 0 60 60 0 8 0 uvmvnodes 72 2337 0 0 43 0 43 43 0 8 0 vnodes 208 2337 0 0 123 0 123 123 0 8 0 namei 1024 8373 0 8373 1 0 1 1 0 8 1 pfiaddrpl 120 48 0 40 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 8786 0 8786 1 0 1 1 0 8 1 plimitpl 152 50 0 43 1 0 1 1 0 8 0 sigapl 424 798 0 749 6 0 6 6 0 8 0 futexpl 56 11527 0 11526 1 0 1 1 0 8 0 knotepl 112 82 0 62 1 0 1 1 0 8 0 kqueuepl 144 58 0 56 1 0 1 1 0 8 0 pipepl 272 128 0 115 2 1 1 2 0 8 0 fdescpl 432 763 0 749 2 0 2 2 0 8 0 filepl 120 4464 0 4362 4 0 4 4 0 8 0 lockfpl 104 80 0 79 1 0 1 1 0 8 0 lockfspl 48 33 0 32 1 0 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 96 353 0 346 1 0 1 1 0 8 0 zombiepl 144 749 0 749 1 0 1 1 0 8 1 processpl 928 798 0 749 7 0 7 7 0 8 0 procpl 624 1592 0 1535 5 0 5 5 0 8 0 sosppl 128 4 0 4 1 1 0 1 0 8 0 sockpl 400 1384 0 1366 3 0 3 3 0 8 1 mcl64k 65536 31 0 31 4 4 0 1 0 8 0 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 19 0 19 5 4 1 1 0 8 1 mcl9k 9216 10 0 10 4 4 0 1 0 8 0 mcl8k 8192 22 0 22 5 4 1 1 0 8 1 mcl4k 4096 47 0 47 4 4 0 1 0 8 0 mcl2k2 2112 8 0 8 3 3 0 1 0 8 0 mcl2k 2048 94491 0 94447 17 11 6 13 0 8 0 mtagpl 96 61 0 32 3 1 2 2 0 8 0 mbufpl 256 152676 0 152469 20 6 14 17 0 8 0 bufpl 280 4088 0 115 284 0 284 284 0 8 0 anonpl 16 88736 0 70740 93 18 75 90 0 107 0 amapchunkpl 152 4907 0 4722 26 18 8 22 0 158 0 amappl16 192 3440 0 2472 66 17 49 61 0 8 0 amappl15 184 3 0 0 1 0 1 1 0 8 0 amappl14 176 345 0 342 1 0 1 1 0 8 0 amappl13 168 240 0 236 1 0 1 1 0 8 0 amappl12 160 236 0 232 1 0 1 1 0 8 0 amappl11 152 390 0 379 1 0 1 1 0 8 0 amappl10 144 15 0 10 1 0 1 1 0 8 0 amappl9 136 352 0 351 1 0 1 1 0 8 0 amappl8 128 294 0 264 1 0 1 1 0 8 0 amappl7 120 103 0 91 1 0 1 1 0 8 0 amappl6 112 28 0 23 1 0 1 1 0 8 0 amappl5 104 150 0 140 1 0 1 1 0 8 0 amappl4 96 988 0 958 1 0 1 1 0 8 0 amappl3 88 705 0 693 1 0 1 1 0 8 0 amappl2 80 5292 0 5227 2 0 2 2 0 8 0 amappl1 72 27224 0 26807 22 12 10 17 0 8 0 amappl 80 1810 0 1758 2 0 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 34 0 6 1 0 1 1 0 8 0 uaddrrnd 24 763 0 749 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 763 0 749 1 0 1 1 0 8 0 vmmpekpl 168 8321 0 8292 2 0 2 2 0 8 0 vmmpepl 168 100640 0 98578 134 44 90 115 0 357 0 vmsppl 272 762 0 749 2 1 1 2 0 8 0 pdppl 4096 1532 0 1498 6 1 5 6 0 8 0 pvpl 32 259219 0 237590 226 46 180 217 0 265 5 pmappl 200 762 0 749 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 272 0 44 7 0 7 7 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(ffffffff8245935b) at panic+0x164 sys/kern/subr_prf.c:218 pool_p_free(ffffffff82858d80,fffffd80687def90) 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(ffffffff826d2750) 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(ffffffff8245935b) at panic+0x164 sys/kern/subr_prf.c:218 pool_p_free(ffffffff82858d80,fffffd80687def90) 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(ffffffff826d2750) at taskq_thread+0x92 sys/kern/kern_task.c:438 end trace frame: 0x0, count: -5