panic: pool_p_free: tcpqe free list modified: page 0xfffffd802f9fe000; item addr 0xfffffd802f9fe000; offset 0x0=0x0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *282203 57115 0 0x14000 0x200 0 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fd311) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff825852c0,fffffd802f9fef90) 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(ffffffff82463c00) 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: tcpqe free list modified: page 0xfffffd802f9fe000; item addr 0xfffffd802f9fe000; offset 0x0=0x0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fd311) at panic+0x15c sys/kern/subr_prf.c:207 pool_p_free(ffffffff825852c0,fffffd802f9fef90) 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(ffffffff82463c00) at taskq_thread+0x52 sys/kern/kern_task.c:369 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001482ddb0 rbx 0xffff80001482de60 rdx 0x2 rcx 0 rax 0 r8 0xffff80001482dd70 r9 0x1 r10 0 r11 0x1adab9039a2eb0be r12 0x3000000008 r13 0xffff80001482ddc0 r14 0x100 r15 0x1 rip 0xffffffff81d58c98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001482dda0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (systqmp) pid=282203 stat=onproc flags process=14000 proc=200 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffeed0,0xffff8000ffffe288 process=0xffff8000ffffc000 user=0xffff800014829000, vmspace=0xffffffff8255c110 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 5835 275417 13836 0 2 0 syz-executor.1 5835 405056 13836 0 2 0x4000000 syz-executor.1 13836 458007 60080 0 2 0x482 syz-executor.1 49691 443451 60080 0 2 0x2 syz-executor.0 60080 231629 73659 0 3 0x82 thrsleep syz-fuzzer 60080 506122 73659 0 2 0x4000482 syz-fuzzer 60080 140563 73659 0 3 0x4000082 thrsleep syz-fuzzer 60080 203512 73659 0 3 0x4000082 thrsleep syz-fuzzer 60080 46308 73659 0 3 0x4000082 thrsleep syz-fuzzer 60080 442367 73659 0 3 0x4000082 kqread syz-fuzzer 60080 382951 73659 0 3 0x4000082 thrsleep syz-fuzzer 60080 143337 73659 0 3 0x4000082 thrsleep syz-fuzzer 73659 164847 41313 0 3 0x10008a pause ksh 41313 490365 73531 0 3 0x92 select sshd 55809 272389 1 0 3 0x100083 ttyin getty 73531 294767 1 0 3 0x80 select sshd 85554 272096 11394 73 3 0x100090 kqread syslogd 11394 145364 1 0 3 0x100082 netio syslogd 53457 298519 1 77 3 0x100090 poll dhclient 9290 226435 1 0 3 0x80 poll dhclient 35521 332675 0 0 2 0x14200 zerothread 94020 226374 0 0 3 0x14200 aiodoned aiodoned 46213 510406 0 0 3 0x14200 syncer update 62611 256158 0 0 3 0x14200 cleaner cleaner 77013 372149 0 0 3 0x14200 reaper reaper 51377 291768 0 0 3 0x14200 pgdaemon pagedaemon 61873 257209 0 0 3 0x14200 bored crynlk 6669 279621 0 0 3 0x14200 bored crypto 54964 376130 0 0 3 0x40014200 acpi0 acpi0 54609 282946 0 0 3 0x14200 bored softnet *57115 282203 0 0 7 0x14200 systqmp 1128 441109 0 0 3 0x14200 bored systq 22882 435982 0 0 3 0x40014200 bored softclock 65750 253038 0 0 3 0x40014200 idle0 25428 388109 0 0 3 0x14200 bored smr 1 198152 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 9470 6331K 6724K 78643K 10717 0 pcb 13 8K 8K 78643K 49 0 rtable 104 3K 3K 78643K 222 0 ifaddr 53 11K 12K 78643K 67 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 19 0 iov 0 0K 12K 78643K 12 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1266 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 24 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 91 0 proc 48 38K 63K 78643K 366 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 138 0 in_multi 36 2K 2K 78643K 58 0 ether_multi 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 36 159K 159K 78643K 36 0 exec 0 0K 1K 78643K 187 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 108 38K 38K 78643K 1069 0 UVM aobj 8 2K 2K 78643K 8 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 43 0 NDP 8 0K 0K 78643K 15 0 temp 86 3006K 3072K 78643K 7244 0 kqueue 0 0K 0K 78643K 2 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 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 49 0 7 2 0 2 2 0 8 0 unpcb 120 59 0 51 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 75 0 75 1 1 0 1 0 8 0 tcpcb 544 92 0 88 2 0 2 2 0 8 1 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 46 0 45 1 0 1 1 0 8 0 inpcb 280 364 0 357 3 0 3 3 0 8 2 nd6 48 5 0 2 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 236 0 39 14 0 14 14 0 8 0 art_table 32 237 0 39 2 0 2 2 0 8 0 art_node 16 48 0 9 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1507 0 111 46 0 46 46 0 8 0 ffsino 240 1507 0 111 83 0 83 83 0 8 0 nchpl 144 1803 0 192 60 0 60 60 0 8 0 uvmvnodes 72 1584 0 0 29 0 29 29 0 8 0 vnodes 208 1584 0 0 84 0 84 84 0 8 0 namei 1024 4408 0 4408 1 0 1 1 0 8 1 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 528 2 0 0 1 0 1 1 0 8 0 scxspl 192 4929 0 4929 8 1 7 7 0 8 7 plimitpl 152 18 0 11 1 0 1 1 0 8 0 sigapl 432 262 0 249 2 0 2 2 0 8 0 futexpl 56 2089 0 2089 1 0 1 1 0 8 1 knotepl 112 65 0 46 1 0 1 1 0 8 0 kqueuepl 104 22 0 20 1 0 1 1 0 8 0 pipepl 128 174 0 155 2 0 2 2 0 8 1 fdescpl 424 263 0 249 2 0 2 2 0 8 0 filepl 120 1623 0 1528 5 0 5 5 0 8 2 lockfpl 104 35 0 34 1 0 1 1 0 8 0 lockfspl 48 10 0 9 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 80 0 73 1 0 1 1 0 8 0 zombiepl 144 249 0 249 1 0 1 1 0 8 1 processpl 864 277 0 249 4 0 4 4 0 8 0 procpl 632 366 0 330 4 0 4 4 0 8 0 sockpl 384 444 0 427 5 0 5 5 0 8 3 mcl64k 65536 3 0 3 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 4 0 4 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 5 0 5 1 0 1 1 0 8 1 mcl4k 4096 17 0 17 1 0 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 69317 0 69275 14 2 12 12 0 8 6 mtagpl 80 9 0 2 2 1 1 1 0 8 0 mbufpl 256 109892 0 109781 26 7 19 25 0 8 8 bufpl 280 6243 0 1420 345 0 345 345 0 8 0 anonpl 16 47672 0 29065 91 1 90 90 0 62 14 amapchunkpl 152 1249 0 1100 8 0 8 8 0 158 1 amappl16 192 1567 0 551 63 4 59 63 0 8 7 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 25 0 23 1 0 1 1 0 8 0 amappl12 160 10 0 8 1 0 1 1 0 8 0 amappl11 152 120 0 104 1 0 1 1 0 8 0 amappl10 144 12 0 9 1 0 1 1 0 8 0 amappl9 136 549 0 546 1 0 1 1 0 8 0 amappl8 128 113 0 88 1 0 1 1 0 8 0 amappl7 120 90 0 79 1 0 1 1 0 8 0 amappl6 112 108 0 101 1 0 1 1 0 8 0 amappl5 104 157 0 147 1 0 1 1 0 8 0 amappl4 96 473 0 444 1 0 1 1 0 8 0 amappl3 88 125 0 117 1 0 1 1 0 8 0 amappl2 80 1320 0 1250 3 1 2 3 0 8 0 amappl1 72 14389 0 13975 25 11 14 20 0 8 5 amappl 80 600 0 556 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 265 0 249 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 265 0 249 1 0 1 1 0 8 0 vmmpekpl 168 5906 0 5881 2 0 2 2 0 8 0 vmmpepl 168 40034 0 37925 132 4 128 128 0 357 35 vmsppl 272 264 0 249 2 0 2 2 0 8 1 pdppl 4096 536 0 500 6 0 6 6 0 8 1 pvpl 32 145650 0 124075 210 0 210 210 0 265 32 pmappl 200 264 0 249 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 158 0 11 5 0 5 5 0 8 0