panic: pool_p_free: anonpl free list modified: page 0xfffffd80668a7000; item addr 0xfffffd80668a7000; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *278520 32583 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82234d15) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8257c9f0,fffffd80668a7f90) 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(ffffffff82500af0) at taskq_thread+0x52 sys/kern/kern_task.c:370 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: anonpl free list modified: page 0xfffffd80668a7000; item addr 0xfffffd80668a7000; offset 0x0=0x0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82234d15) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8257c9f0,fffffd80668a7f90) 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(ffffffff82500af0) at taskq_thread+0x52 sys/kern/kern_task.c:370 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d7027f0 rbx 0xffff80001d7028a0 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff813da9ef kprintf+0x15f r9 0x1 r10 0x2 r11 0x12d70fa2c8ce17 r12 0x3000000008 r13 0xffff80001d702800 r14 0x100 r15 0x1 rip 0xffffffff81dde048 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d7027e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=278520 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d6e2110,0xffff80001d6e19d0 process=0xffff8000ffffe730 user=0xffff80001d6fd000, vmspace=0xffffffff825c7ac0 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 6222 133258 0 0 3 0x14200 acct acct 63778 308977 22387 0 3 0x82 wait syz-executor.1 23505 288395 0 0 3 0x14200 bored sosplice 36446 245306 22387 0 3 0x82 piperd syz-executor.0 22387 488252 78076 0 3 0x82 thrsleep syz-fuzzer 22387 242238 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 500343 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 7819 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 336436 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 521283 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 359900 78076 0 3 0x4000082 thrsleep syz-fuzzer 22387 462619 78076 0 3 0x4000082 kqread syz-fuzzer 78076 335042 59059 0 3 0x10008a pause ksh 59059 301104 51782 0 3 0x92 select sshd 58865 379059 1 0 3 0x100083 ttyin getty 51782 282747 1 0 3 0x80 select sshd 74500 277733 35070 73 3 0x100090 kqread syslogd 35070 255271 1 0 3 0x100082 netio syslogd 95246 200068 1 77 3 0x100090 poll dhclient 17529 382893 1 0 3 0x80 poll dhclient 11031 389282 0 0 3 0x14200 bored smr 51096 306713 0 0 2 0x14200 zerothread 94022 471607 0 0 3 0x14200 aiodoned aiodoned 14072 377892 0 0 3 0x14200 syncer update 73717 186881 0 0 3 0x14200 cleaner cleaner 11542 340475 0 0 3 0x14200 reaper reaper 68045 261836 0 0 3 0x14200 pgdaemon pagedaemon 70041 272594 0 0 3 0x14200 bored crynlk 42064 340525 0 0 3 0x14200 bored crypto 90032 380223 0 0 3 0x40014200 acpi0 acpi0 67744 516678 0 0 3 0x14200 bored softnet *32583 278520 0 0 7 0x14200 systqmp 26032 395972 0 0 3 0x14200 bored systq 66972 20574 0 0 3 0x40014200 bored softclock 66002 465847 0 0 3 0x40014200 idle0 1 509993 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 9532 6614K 7646K 78643K 14604 0 pcb 13 8K 8K 78643K 182 0 rtable 118 12K 12K 78643K 673 0 ifaddr 94 19K 20K 78643K 238 0 counters 21 16K 16K 78643K 45 0 ioctlops 0 0K 2K 78643K 52 0 iov 0 0K 32K 78643K 159 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 2218 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 12 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 162 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 5 13K 25K 78643K 861 0 sigio 0 0K 0K 78643K 15 0 proc 53 39K 55K 78643K 501 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 105 0 in_multi 96 4K 4K 78643K 216 0 ether_multi 1 0K 0K 78643K 27 0 mrt 0 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 303 0 pfkey data 0 0K 0K 78643K 2 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 72K 97K 78643K 2897 0 UVM aobj 38 7K 7K 78643K 49 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 151 0 NDP 13 0K 0K 78643K 48 0 temp 114 3037K 3101K 78643K 17368 0 kqueue 4 5K 21K 78643K 66 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 14 0 5 1 0 1 1 0 8 0 rtpcb 80 229 0 227 1 0 1 1 0 8 0 rtentry 112 97 0 51 2 0 2 2 0 8 0 unpcb 120 663 0 654 1 0 1 1 0 8 0 syncache 264 12 0 12 2 1 1 1 0 8 1 tcpqe 32 223 0 223 3 2 1 1 0 8 1 tcpcb 544 357 0 352 1 0 1 1 0 8 0 ipq 40 4 0 4 2 2 0 1 0 8 0 ipqe 40 94 0 94 2 2 0 1 0 8 0 inpcb 280 1027 0 1019 5 3 2 2 0 8 1 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 17 0 13 1 0 1 1 0 8 0 pkpcb 40 8 0 8 3 2 1 1 0 8 1 ppxss 1128 7 0 7 2 1 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 424 0 215 14 0 14 14 0 8 0 art_table 32 426 0 215 2 0 2 2 0 8 0 art_node 16 96 0 52 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 12 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 156 0 146 1 0 1 1 0 8 0 shmpl 112 47 0 11 3 1 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2655 0 1262 88 0 88 88 0 8 0 ffsino 240 2655 0 1262 83 0 83 83 0 8 0 nchpl 144 4388 0 2814 60 0 60 60 0 8 0 uvmvnodes 72 3540 0 0 65 0 65 65 0 8 0 vnodes 208 3540 0 0 187 0 187 187 0 8 0 namei 1024 12680 0 12680 4 3 1 1 0 8 1 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 528 14 0 8 2 1 1 1 0 8 0 scsiplug 64 2 0 2 2 1 1 1 0 8 1 scxspl 192 11795 0 11795 3 2 1 1 0 8 1 plimitpl 152 123 0 116 1 0 1 1 0 8 0 sigapl 424 1046 0 1016 4 0 4 4 0 8 0 futexpl 56 19824 0 19824 4 3 1 1 0 8 1 knotepl 112 154 0 134 1 0 1 1 0 8 0 kqueuepl 144 140 0 135 1 0 1 1 0 8 0 pipelkpl 16 210 0 200 1 0 1 1 0 8 0 pipepl 120 420 0 401 1 0 1 1 0 8 0 fdescpl 432 1030 0 1016 2 0 2 2 0 8 0 filepl 120 7550 0 7440 4 0 4 4 0 8 0 lockfpl 104 218 0 217 1 0 1 1 0 8 0 lockfspl 48 78 0 77 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 30 0 20 1 0 1 1 0 8 0 ucredpl 96 853 0 846 1 0 1 1 0 8 0 zombiepl 144 1017 0 1016 1 0 1 1 0 8 0 processpl 920 1046 0 1016 4 0 4 4 0 8 0 procpl 624 2078 0 2041 7 3 4 4 0 8 0 sosppl 128 21 0 21 5 5 0 1 0 8 0 sockpl 400 1927 0 1908 10 7 3 4 0 8 0 mcl64k 65536 337 0 335 35 30 5 33 0 8 4 mcl16k 16384 6 0 6 4 3 1 1 0 8 1 mcl12k 12288 24 0 24 5 4 1 1 0 8 1 mcl9k 9216 13 0 13 6 5 1 1 0 8 1 mcl8k 8192 25 0 25 6 6 0 1 0 8 0 mcl4k 4096 119 0 119 5 4 1 1 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 67246 0 67201 19 12 7 15 0 8 0 mtagpl 80 91 0 36 3 1 2 2 0 8 0 mbufpl 256 114464 0 114032 60 28 32 40 0 8 0 bufpl 280 5185 0 132 361 0 361 361 0 8 0 anonpl 16 113788 0 100169 110 46 64 75 0 107 6 amapchunkpl 152 6142 0 6007 34 15 19 19 0 158 13 amappl16 192 5168 0 4378 89 49 40 53 0 8 0 amappl15 184 396 0 394 1 0 1 1 0 8 0 amappl14 176 24 0 20 1 0 1 1 0 8 0 amappl13 168 29 0 28 1 0 1 1 0 8 0 amappl12 160 408 0 403 1 0 1 1 0 8 0 amappl11 152 417 0 406 1 0 1 1 0 8 0 amappl10 144 62 0 56 1 0 1 1 0 8 0 amappl9 136 372 0 370 1 0 1 1 0 8 0 amappl8 128 379 0 337 2 0 2 2 0 8 0 amappl7 120 163 0 151 1 0 1 1 0 8 0 amappl6 112 395 0 387 1 0 1 1 0 8 0 amappl5 104 597 0 585 1 0 1 1 0 8 0 amappl4 96 815 0 784 1 0 1 1 0 8 0 amappl3 88 135 0 129 1 0 1 1 0 8 0 amappl2 80 7715 0 7651 2 0 2 2 0 8 0 amappl1 72 27504 0 27081 23 14 9 17 0 8 0 amappl 80 2351 0 2304 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 48 0 11 1 0 1 1 0 8 0 uaddrrnd 24 1044 0 1024 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1044 0 1024 1 0 1 1 0 8 0 vmmpekpl 168 10168 0 10140 2 0 2 2 0 8 0 vmmpepl 168 126124 0 124220 146 57 89 108 0 357 3 vmsppl 272 1043 0 1024 3 1 2 2 0 8 0 pdppl 4096 2094 0 2054 8 2 6 6 0 8 0 pvpl 32 315671 0 299056 216 48 168 184 0 265 28 pmappl 200 1043 0 1024 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 354 0 101 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(ffffffff82234d15) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8257c9f0,fffffd80668a7f90) 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(ffffffff82500af0) at taskq_thread+0x52 sys/kern/kern_task.c:370 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(ffffffff82234d15) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8257c9f0,fffffd80668a7f90) 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(ffffffff82500af0) at taskq_thread+0x52 sys/kern/kern_task.c:370 end trace frame: 0x0, count: -5