panic: pool_p_free: mbufpl free list modified: page 0xfffffd802d6db000; item addr 0xfffffd802d6db000; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *197063 72445 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fd447) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82563c50,fffffd802d7a3b80) 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(ffffffff824771f0) 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 0xfffffd802d6db000; item addr 0xfffffd802d6db000; offset 0x0=0x0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fd447) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff82563c50,fffffd802d7a3b80) 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(ffffffff824771f0) at taskq_thread+0x52 sys/kern/kern_task.c:369 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001482e760 rbx 0xffff80001482e810 rdx 0x2 rcx 0 rax 0 r8 0xffff80001482e720 r9 0x1 r10 0 r11 0x932f7961ae9c2ec4 r12 0x3000000008 r13 0xffff80001482e770 r14 0x100 r15 0x1 rip 0xffffffff817e9708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001482e750 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=197063 stat=onproc flags process=14000 proc=200 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffec58,0xffff8000ffffe288 process=0xffff8000ffffcd80 user=0xffff800014829000, vmspace=0xffffffff82578d90 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 75698 166079 7084 0 2 0 syz-executor.0 75698 42857 7084 0 3 0x4000080 fsleep syz-executor.0 74018 463707 48612 0 2 0 syz-executor.1 74018 38864 48612 0 3 0x4000080 fsleep syz-executor.1 74018 84271 48612 0 2 0x4000000 syz-executor.1 18544 189310 0 0 3 0x14200 bored sosplice 81466 66650 0 0 3 0x14200 acct acct 7084 9238 69229 0 2 0x482 syz-executor.0 48612 236595 69229 0 2 0x482 syz-executor.1 69229 142017 37973 0 3 0x82 kqread syz-fuzzer 69229 40665 37973 0 3 0x4000082 thrsleep syz-fuzzer 69229 230021 37973 0 3 0x4000082 thrsleep syz-fuzzer 69229 410713 37973 0 3 0x4000082 thrsleep syz-fuzzer 69229 469430 37973 0 3 0x4000082 thrsleep syz-fuzzer 69229 52062 37973 0 3 0x4000082 thrsleep syz-fuzzer 69229 348145 37973 0 3 0x4000082 thrsleep syz-fuzzer 37973 139529 37063 0 3 0x10008a pause ksh 37063 243477 63344 0 3 0x92 select sshd 62811 289529 1 0 3 0x100083 ttyin getty 63344 434814 1 0 3 0x80 select sshd 1710 355926 31173 73 3 0x100090 kqread syslogd 31173 374109 1 0 3 0x100082 netio syslogd 77201 44435 1 77 3 0x100090 poll dhclient 31123 462147 1 0 3 0x80 poll dhclient 14295 257297 0 0 2 0x14200 zerothread 86031 229857 0 0 3 0x14200 aiodoned aiodoned 53182 369468 0 0 3 0x14200 syncer update 52208 263734 0 0 3 0x14200 cleaner cleaner 92913 465412 0 0 3 0x14200 reaper reaper 42145 129666 0 0 3 0x14200 pgdaemon pagedaemon 91877 519341 0 0 3 0x14200 bored crynlk 28170 125857 0 0 3 0x14200 bored crypto 52214 131049 0 0 3 0x40014200 acpi0 acpi0 40284 125302 0 0 3 0x14200 bored softnet *72445 197063 0 0 7 0x14200 systqmp 93192 116727 0 0 3 0x14200 bored systq 23728 184757 0 0 3 0x40014200 bored softclock 9274 15531 0 0 3 0x40014200 idle0 40893 386305 0 0 3 0x14200 bored smr 1 204246 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 9523 6357K 7000K 78643K 11929 0 pcb 14 8K 9K 78643K 112 0 rtable 104 3K 3K 78643K 392 0 ifaddr 87 16K 17K 78643K 156 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 44 0 iov 0 0K 24K 78643K 190 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 1648 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 97 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 464 0 sigio 0 0K 0K 78643K 5 0 proc 49 38K 63K 78643K 416 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 81 0 in_multi 63 3K 3K 78643K 96 0 ether_multi 1 0K 0K 78643K 3 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 78 344K 344K 78643K 78 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 133 119K 120K 78643K 1993 0 UVM aobj 27 2K 2K 78643K 42 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 91 0 NDP 15 0K 0K 78643K 34 0 temp 144 3019K 3106K 78643K 30383 0 kqueue 0 0K 0K 78643K 14 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 9 0 2 1 0 1 1 0 8 0 rtpcb 80 67 0 65 1 0 1 1 0 8 0 rtentry 112 72 0 30 2 0 2 2 0 8 0 unpcb 120 302 0 294 1 0 1 1 0 8 0 syncache 264 10 0 10 3 2 1 1 0 8 1 tcpqe 32 176 0 176 1 1 0 1 0 8 0 tcpcb 544 214 0 209 2 1 1 2 0 8 0 ipq 40 2 0 2 2 2 0 1 0 8 0 ipqe 40 90 0 90 2 2 0 1 0 8 0 inpcb 280 612 0 603 6 4 2 4 0 8 1 rttmr 72 2 0 2 1 1 0 1 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 48 8 0 6 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 6 0 6 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 322 0 130 15 1 14 15 0 8 0 art_table 32 323 0 130 2 0 2 2 0 8 0 art_node 16 71 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 95 0 85 1 0 1 1 0 8 0 shmpl 112 40 0 15 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2295 0 893 46 0 46 46 0 8 0 ffsino 240 2295 0 893 83 0 83 83 0 8 0 nchpl 144 3444 0 1829 60 0 60 60 0 8 0 uvmvnodes 72 2657 0 0 49 0 49 49 0 8 0 vnodes 208 2657 0 0 140 0 140 140 0 8 0 namei 1024 10477 0 10477 1 0 1 1 0 8 1 vcpupl 1984 13 0 0 2 0 2 2 0 8 0 vmpool 528 17 0 4 1 0 1 1 0 8 0 scxspl 192 10037 0 10037 8 7 1 7 0 8 1 plimitpl 152 57 0 50 1 0 1 1 0 8 0 sigapl 432 635 0 621 2 0 2 2 0 8 0 futexpl 56 15307 0 15305 1 0 1 1 0 8 0 knotepl 112 138 0 117 2 0 2 2 0 8 1 kqueuepl 104 132 0 128 1 0 1 1 0 8 0 pipepl 128 356 0 335 2 1 1 2 0 8 0 fdescpl 424 636 0 621 2 0 2 2 0 8 0 filepl 120 6028 0 5923 8 2 6 6 0 8 2 lockfpl 104 199 0 198 1 0 1 1 0 8 0 lockfspl 48 62 0 61 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 21 0 11 1 0 1 1 0 8 0 ucredpl 96 496 0 489 1 0 1 1 0 8 0 zombiepl 144 621 0 621 1 0 1 1 0 8 1 processpl 864 652 0 621 4 0 4 4 0 8 0 procpl 632 1242 0 1202 4 0 4 4 0 8 0 sosppl 128 6 0 6 2 1 1 1 0 8 1 sockpl 384 985 0 966 8 4 4 7 0 8 2 mcl64k 65536 49 0 49 1 0 1 1 0 8 1 mcl16k 16384 6 0 6 3 2 1 1 0 8 1 mcl12k 12288 13 0 13 2 1 1 1 0 8 1 mcl9k 9216 12 0 12 3 2 1 1 0 8 1 mcl8k 8192 24 0 24 1 0 1 1 0 8 1 mcl4k 4096 63 0 63 2 1 1 1 0 8 1 mcl2k2 2112 5 0 5 1 1 0 1 0 8 0 mcl2k 2048 69832 0 69782 15 8 7 14 0 8 0 mtagpl 80 31 0 3 2 1 1 1 0 8 0 mbufpl 256 114468 0 114288 45 25 20 38 0 8 5 bufpl 280 7605 0 2685 352 0 352 352 0 8 0 anonpl 16 92160 0 71141 105 5 100 100 0 62 15 amapchunkpl 152 3398 0 3239 20 13 7 20 0 158 0 amappl16 192 4127 0 2963 77 11 66 70 0 8 7 amappl15 184 487 0 479 1 0 1 1 0 8 0 amappl14 176 239 0 235 1 0 1 1 0 8 0 amappl13 168 1 0 0 1 0 1 1 0 8 0 amappl12 160 5 0 4 2 1 1 1 0 8 0 amappl11 152 48 0 35 1 0 1 1 0 8 0 amappl10 144 9 0 7 1 0 1 1 0 8 0 amappl9 136 557 0 554 1 0 1 1 0 8 0 amappl8 128 131 0 100 1 0 1 1 0 8 0 amappl7 120 91 0 81 1 0 1 1 0 8 0 amappl6 112 56 0 49 1 0 1 1 0 8 0 amappl5 104 152 0 142 1 0 1 1 0 8 0 amappl4 96 864 0 831 1 0 1 1 0 8 0 amappl3 88 348 0 338 1 0 1 1 0 8 0 amappl2 80 4562 0 4481 3 1 2 3 0 8 0 amappl1 72 20772 0 20330 26 17 9 20 0 8 0 amappl 80 1494 0 1440 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 41 0 15 1 0 1 1 0 8 0 uaddrrnd 24 653 0 625 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 653 0 625 1 0 1 1 0 8 0 vmmpekpl 168 7809 0 7782 2 0 2 2 0 8 0 vmmpepl 168 84711 0 82298 133 23 110 128 0 357 5 vmsppl 272 652 0 625 2 0 2 2 0 8 0 pdppl 4096 1312 0 1263 7 0 7 7 0 8 0 pvpl 32 251026 0 226931 225 4 221 223 0 265 26 pmappl 200 652 0 625 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 183 0 39 5 0 5 5 0 8 0