panic: pool_p_free: mbufpl free list modified: page 0xfffffd802ed38000; item addr 0xfffffd802ed38000; offset 0x0=0x929b780000000000 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *240192 12217 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fe5cf) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8253d850,fffffd802dfd2560) at pool_p_free+0x1de sys/kern/subr_pool.c:991 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1586 taskq_thread(ffffffff82475140) at taskq_thread+0x52 sys/kern/kern_task.c:369 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: mbufpl free list modified: page 0xfffffd802ed38000; item addr 0xfffffd802ed38000; offset 0x0=0x929b780000000000 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fe5cf) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff8253d850,fffffd802dfd2560) at pool_p_free+0x1de sys/kern/subr_pool.c:991 pool_gc_pages(0) at pool_gc_pages+0x225 sys/kern/subr_pool.c:1586 taskq_thread(ffffffff82475140) at taskq_thread+0x52 sys/kern/kern_task.c:369 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001482e850 rbx 0xffff80001482e900 rdx 0x2 rcx 0 rax 0 r8 0xffff80001482e810 r9 0x1 r10 0 r11 0x83ae71b6dad62b30 r12 0x3000000008 r13 0xffff80001482e860 r14 0x100 r15 0x1 rip 0xffffffff81933778 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001482e840 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=240192 stat=onproc flags process=14000 proc=200 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffeed0,0xffff8000ffffe500 process=0xffff8000ffffc000 user=0xffff800014829000, vmspace=0xffffffff8253bfc8 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 11660 109648 70382 0 3 0x80 nanosleep syz-executor.0 11660 182259 70382 0 3 0x4000080 kqread syz-executor.0 11660 424799 70382 0 3 0x4000080 fsleep syz-executor.0 63351 518848 8253 0 3 0x80 nanosleep syz-executor.1 63351 133185 8253 0 3 0x4000080 kqread syz-executor.1 63351 67535 8253 0 3 0x4000080 fsleep syz-executor.1 70382 55324 50410 0 2 0x482 syz-executor.0 42789 370213 0 0 3 0x14200 bored sosplice 48895 97822 0 0 3 0x14200 acct acct 8253 332479 50410 0 2 0x482 syz-executor.1 50410 465060 1269 0 3 0x82 thrsleep syz-fuzzer 50410 379049 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 102487 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 476571 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 449427 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 30383 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 57444 1269 0 3 0x4000082 thrsleep syz-fuzzer 50410 247339 1269 0 3 0x4000082 kqread syz-fuzzer 1269 59558 6556 0 3 0x10008a pause ksh 6556 380657 37127 0 3 0x92 select sshd 25256 43877 1 0 3 0x100083 ttyin getty 37127 334509 1 0 3 0x80 select sshd 54692 134679 43713 73 3 0x100090 kqread syslogd 43713 85791 1 0 3 0x100082 netio syslogd 48324 1854 1 77 3 0x100090 poll dhclient 44647 137794 1 0 3 0x80 poll dhclient 27160 336893 0 0 3 0x14200 pgzero zerothread 71950 165696 0 0 3 0x14200 aiodoned aiodoned 94197 455472 0 0 3 0x14200 syncer update 33511 111458 0 0 3 0x14200 cleaner cleaner 71803 490876 0 0 3 0x14200 reaper reaper 38091 123799 0 0 3 0x14200 pgdaemon pagedaemon 54500 384253 0 0 3 0x14200 bored crynlk 94414 500552 0 0 3 0x14200 bored crypto 56534 384275 0 0 3 0x40014200 acpi0 acpi0 68585 58414 0 0 3 0x14200 bored softnet *12217 240192 0 0 7 0x14200 systqmp 89552 53416 0 0 3 0x14200 bored systq 84140 220726 0 0 3 0x40014200 bored softclock 47092 375037 0 0 3 0x40014200 idle0 30566 334174 0 0 3 0x14200 bored smr 1 126085 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 9516 6349K 7694K 78643K 12457 0 pcb 13 8K 8K 78643K 112 0 rtable 112 3K 4K 78643K 330 0 ifaddr 85 16K 16K 78643K 153 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 39 0 iov 0 0K 16K 78643K 86 0 mount 1 1K 1K 78643K 1 0 vnodes 1233 77K 78K 78643K 1750 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 174 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 388 0 proc 49 38K 63K 78643K 423 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 31 0 in_multi 85 4K 4K 78643K 106 0 ether_multi 1 0K 0K 78643K 2 0 mrt 0 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 42 185K 185K 78643K 42 0 exec 0 0K 1K 78643K 241 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 130 103K 104K 78643K 2066 0 UVM aobj 29 3K 3K 78643K 33 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 76 0 NDP 14 0K 0K 78643K 29 0 temp 142 3019K 3086K 78643K 5470 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 10 0 3 1 0 1 1 0 8 0 rtpcb 80 27 0 25 1 0 1 1 0 8 0 rtentry 112 61 0 15 2 0 2 2 0 8 0 unpcb 120 285 0 277 1 0 1 1 0 8 0 syncache 264 8 0 8 3 3 0 1 0 8 0 tcpqe 32 370 0 370 1 1 0 1 0 8 0 tcpcb 544 264 0 260 4 2 2 2 0 8 1 ipq 40 11 0 11 4 4 0 1 0 8 0 ipqe 40 239 0 239 4 4 0 1 0 8 0 inpcb 280 644 0 637 5 3 2 4 0 8 1 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 6 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 ppxss 1128 8 0 8 4 4 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 277 0 45 16 1 15 15 0 8 0 art_table 32 279 0 45 2 0 2 2 0 8 0 art_node 16 60 0 18 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 26 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 172 0 162 1 0 1 1 0 8 0 shmpl 112 31 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1964 0 563 46 0 46 46 0 8 0 ffsino 240 1964 0 563 83 0 83 83 0 8 0 nchpl 144 2842 0 1235 61 0 61 61 0 8 0 uvmvnodes 72 2465 0 0 45 0 45 45 0 8 0 vnodes 208 2465 0 0 130 0 130 130 0 8 0 namei 1024 8047 0 8047 2 1 1 1 0 8 1 vcpupl 1984 10 0 0 2 0 2 2 0 8 0 vmpool 528 10 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 7912 0 7912 12 11 1 7 0 8 1 plimitpl 152 50 0 43 1 0 1 1 0 8 0 sigapl 432 556 0 542 2 0 2 2 0 8 0 futexpl 56 12301 0 12299 1 0 1 1 0 8 0 knotepl 112 116 0 97 1 0 1 1 0 8 0 kqueuepl 104 338 0 334 1 0 1 1 0 8 0 pipepl 128 350 0 331 4 3 1 2 0 8 0 fdescpl 424 557 0 542 2 0 2 2 0 8 0 filepl 120 4654 0 4554 5 1 4 5 0 8 0 lockfpl 104 143 0 142 1 0 1 1 0 8 0 lockfspl 48 44 0 43 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 22 0 12 1 0 1 1 0 8 0 ucredpl 96 432 0 425 1 0 1 1 0 8 0 zombiepl 144 542 0 542 2 1 1 1 0 8 1 processpl 864 573 0 542 4 0 4 4 0 8 0 procpl 632 1273 0 1231 6 2 4 5 0 8 0 sosppl 128 14 0 14 3 3 0 1 0 8 0 sockpl 384 967 0 950 9 4 5 6 0 8 3 mcl64k 65536 30 0 29 2 1 1 1 0 8 0 mcl16k 16384 7 0 7 3 3 0 1 0 8 0 mcl12k 12288 10 0 10 3 3 0 1 0 8 0 mcl9k 9216 8 0 7 3 2 1 1 0 8 0 mcl8k 8192 21 0 21 3 2 1 1 0 8 1 mcl4k 4096 58 0 58 2 1 1 1 0 8 1 mcl2k2 2112 2 0 2 2 2 0 1 0 8 0 mcl2k 2048 70388 0 70322 28 19 9 23 0 8 0 mtagpl 80 24 0 2 2 1 1 1 0 8 0 mbufpl 256 115682 0 115528 39 27 12 23 0 8 0 bufpl 280 7241 0 2347 350 0 350 350 0 8 0 anonpl 16 79995 0 63055 119 20 99 99 0 62 16 amapchunkpl 152 3891 0 3746 30 22 8 20 0 158 2 amappl16 192 3227 0 2099 79 13 66 69 0 8 8 amappl15 184 53 0 49 1 0 1 1 0 8 0 amappl14 176 203 0 199 1 0 1 1 0 8 0 amappl12 160 163 0 161 2 1 1 1 0 8 0 amappl11 152 53 0 41 1 0 1 1 0 8 0 amappl10 144 26 0 22 1 0 1 1 0 8 0 amappl9 136 577 0 574 1 0 1 1 0 8 0 amappl8 128 129 0 101 1 0 1 1 0 8 0 amappl7 120 111 0 99 1 0 1 1 0 8 0 amappl6 112 53 0 48 1 0 1 1 0 8 0 amappl5 104 292 0 282 1 0 1 1 0 8 0 amappl4 96 460 0 432 1 0 1 1 0 8 0 amappl3 88 624 0 610 1 0 1 1 0 8 0 amappl2 80 3612 0 3533 3 1 2 3 0 8 0 amappl1 72 20318 0 19873 26 16 10 20 0 8 0 amappl 80 1538 0 1485 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 32 0 4 1 0 1 1 0 8 0 uaddrrnd 24 567 0 542 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 567 0 542 1 0 1 1 0 8 0 vmmpekpl 168 8395 0 8369 2 0 2 2 0 8 0 vmmpepl 168 76285 0 73913 184 42 142 142 0 357 38 vmsppl 272 566 0 542 2 0 2 2 0 8 0 pdppl 4096 1140 0 1094 6 0 6 6 0 8 0 pvpl 32 224633 0 204408 251 24 227 227 0 265 37 pmappl 200 566 0 542 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 197 0 58 5 0 5 5 0 8 0