panic(ffffffff8224d10a) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff825c0b20,2,ffff80001d7adce8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff825c0b20,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 m_copym(fffffd805f4ddc00,0,36c,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd805f4ddc00,0,36c,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff8000009f6320) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805dabb968,9,fffffd805f4ddc00,0,0,ffff80001d7a7010) at tcp_usrreq+0xa54 sosend(fffffd805dabb968,0,ffff80001d7ae1c8,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d7a7010,4,ffff80001d7ae1c8,0,ffff80001d7ae2b0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d7a7010,ffff80001d7ae260,ffff80001d7ae2b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d7ae330) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff1d20, count: 3 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_do_get: mbufpl free list modified: page 0xfffffd805f4dd000; item addr 0xfffffd805f4ddd00; offset 0x0=0x0 != 0x225fb7549e7c21 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224d10a) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff825c0b20,2,ffff80001d7adce8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff825c0b20,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 m_copym(fffffd805f4ddc00,0,36c,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd805f4ddc00,0,36c,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff8000009f6320) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805dabb968,9,fffffd805f4ddc00,0,0,ffff80001d7a7010) at tcp_usrreq+0xa54 sosend(fffffd805dabb968,0,ffff80001d7ae1c8,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d7a7010,4,ffff80001d7ae1c8,0,ffff80001d7ae2b0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d7a7010,ffff80001d7ae260,ffff80001d7ae2b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d7ae330) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff1d20, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d7adb50 rbx 0xffff80001d7adc00 rdx 0x2 rcx 0 rax 0 r8 0xffff80001d7adb10 r9 0x1 r10 0 r11 0xd4fdcbb2f5bae175 r12 0x3000000008 r13 0xffff80001d7adb60 r14 0x100 r15 0x1 rip 0xffffffff8128fcb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d7adb40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (sshd) pid=34469 stat=onproc flags process=12 proc=0 pri=24, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff80001d7a7eb0,0xffff80001d7a7770 process=0xffff8000ffff8018 user=0xffff80001d7a9000, vmspace=0xfffffd806bc0a990 estcpu=4, cpticks=16, pctcpu=0.0 user=0, sys=15, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 73278 382939 7441 0 2 0x2 syz-executor.1 62655 320947 0 0 3 0x14200 bored sosplice 98352 128868 7441 0 3 0x2 biowait syz-executor.0 7441 137256 76426 0 3 0x82 thrsleep syz-fuzzer 7441 43663 76426 0 2 0x4000002 syz-fuzzer 7441 40203 76426 0 3 0x4000082 thrsleep syz-fuzzer 7441 437243 76426 0 3 0x4000082 thrsleep syz-fuzzer 7441 259541 76426 0 2 0x4000002 syz-fuzzer 7441 310061 76426 0 3 0x4000082 thrsleep syz-fuzzer 7441 434740 76426 0 3 0x4000082 thrsleep syz-fuzzer 7441 299161 76426 0 3 0x4000082 thrsleep syz-fuzzer 76426 93519 66714 0 3 0x10008a pause ksh *66714 34469 88457 0 7 0x12 sshd 96386 334516 1 0 3 0x100083 ttyin getty 88457 89158 1 0 3 0x80 select sshd 5294 230818 84325 73 3 0x100090 kqread syslogd 84325 505391 1 0 3 0x100082 netio syslogd 94407 461817 1 77 3 0x100090 poll dhclient 38201 455186 1 0 3 0x80 poll dhclient 24619 61312 0 0 3 0x14200 bored smr 19247 380396 0 0 3 0x14200 pgzero zerothread 8300 519325 0 0 3 0x14200 aiodoned aiodoned 86571 248969 0 0 3 0x14200 syncer update 99247 331142 0 0 3 0x14200 cleaner cleaner 63394 521711 0 0 3 0x14200 reaper reaper 51538 149336 0 0 3 0x14200 pgdaemon pagedaemon 6681 177664 0 0 3 0x14200 bored crynlk 50235 429264 0 0 3 0x14200 bored crypto 65491 151555 0 0 3 0x40014200 acpi0 acpi0 82461 139421 0 0 3 0x14200 bored softnet 89978 251828 0 0 3 0x14200 bored systqmp 70920 510454 0 0 3 0x14200 bored systq 1272 195833 0 0 3 0x40014200 bored softclock 3657 137426 0 0 3 0x40014200 idle0 1 176197 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 9510 6354K 6981K 78643K 11158 0 pcb 13 8K 8K 78643K 73 0 rtable 104 3K 4K 78643K 294 0 ifaddr 78 15K 15K 78643K 116 0 counters 21 16K 16K 78643K 26 0 ioctlops 0 0K 2K 78643K 36 0 iov 0 0K 12K 78643K 40 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1394 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 1K 1K 78643K 19 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 4 9K 25K 78643K 272 0 sigio 0 0K 0K 78643K 6 0 proc 49 38K 55K 78643K 410 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 27 0 in_multi 57 3K 3K 78643K 109 0 ether_multi 1 0K 0K 78643K 14 0 mrt 0 0K 0K 78643K 2 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 226 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 112 38K 38K 78643K 1483 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 64 0 NDP 14 0K 0K 78643K 25 0 temp 100 3034K 3098K 78643K 8389 0 kqueue 3 4K 12K 78643K 76 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 8 0 2 1 0 1 1 0 8 0 rtpcb 80 33 0 31 1 0 1 1 0 8 0 rtentry 112 62 0 20 2 0 2 2 0 8 0 unpcb 120 150 0 141 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 278 0 278 1 1 0 1 0 8 0 tcpcb 544 120 0 116 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 280 367 0 360 2 0 2 2 0 8 1 nd6 48 11 0 7 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 ppxss 1128 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 280 0 99 14 0 14 14 0 8 1 art_table 32 282 0 99 2 0 2 2 0 8 0 art_node 16 61 0 22 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1781 0 383 88 0 88 88 0 8 0 ffsino 240 1781 0 383 83 0 83 83 0 8 0 nchpl 144 2394 0 796 60 0 60 60 0 8 0 uvmvnodes 72 1959 0 0 36 0 36 36 0 8 0 vnodes 208 1959 0 0 104 0 104 104 0 8 0 namei 1024 6339 0 6339 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 7574 0 7573 1 0 1 1 0 8 0 plimitpl 152 40 0 33 1 0 1 1 0 8 0 sigapl 424 456 0 428 4 0 4 4 0 8 0 futexpl 56 5232 0 5232 1 0 1 1 0 8 1 knotepl 112 149 0 130 1 0 1 1 0 8 0 kqueuepl 144 300 0 295 1 0 1 1 0 8 0 pipelkpl 16 101 0 91 1 0 1 1 0 8 0 pipepl 120 202 0 183 1 0 1 1 0 8 0 fdescpl 432 441 0 428 2 0 2 2 0 8 0 filepl 120 2792 0 2697 4 0 4 4 0 8 1 lockfpl 104 90 0 89 1 0 1 1 0 8 0 lockfspl 48 25 0 24 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 20 0 10 1 0 1 1 0 8 0 ucredpl 96 181 0 174 1 0 1 1 0 8 0 zombiepl 144 428 0 428 1 0 1 1 0 8 1 processpl 920 456 0 428 4 0 4 4 0 8 0 procpl 624 732 0 697 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 400 553 0 535 3 0 3 3 0 8 0 mcl64k 65536 23 0 23 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 5 0 5 1 0 1 1 0 8 1 mcl9k 9216 3 0 3 2 1 1 1 0 8 1 mcl8k 8192 9 0 9 1 0 1 1 0 8 1 mcl4k 4096 26 0 26 2 1 1 1 0 8 1 mcl2k2 2112 2 0 2 1 1 0 1 0 8 0 mcl2k 2048 61747 0 61693 15 7 8 15 0 8 0 mtagpl 80 19 0 12 2 1 1 1 0 8 0 mbufpl 256 99668 0 99558 13 1 12 12 0 8 0 mbufpl: pool(0xffffffff825c0b20:mbufpl): free list modified: page 0xfffffd805f4dd000; item ordinal 0; addr 0xfffffd805f4ddd00 (p 0xfffffd805c03c000); offset 0x0=0x0 mbufpl: pool(0xffffffff825c0b20:mbufpl): page inconsistency: page 0xfffffd805f4dd000; item ordinal 1; addr 0x18b6c4031b75f149 bufpl 280 4917 0 184 339 0 339 339 0 8 0 anonpl 16 58288 0 43915 77 7 70 75 0 107 10 amapchunkpl 152 2085 0 1949 13 0 13 13 0 158 4 amappl16 192 2082 0 1264 51 9 42 51 0 8 0 amappl15 184 117 0 115 1 0 1 1 0 8 0 amappl14 176 44 0 38 1 0 1 1 0 8 0 amappl13 168 49 0 47 1 0 1 1 0 8 0 amappl12 160 136 0 132 2 1 1 1 0 8 0 amappl11 152 137 0 128 1 0 1 1 0 8 0 amappl10 144 16 0 11 1 0 1 1 0 8 0 amappl9 136 334 0 333 1 0 1 1 0 8 0 amappl8 128 323 0 291 2 0 2 2 0 8 0 amappl7 120 113 0 101 1 0 1 1 0 8 0 amappl6 112 110 0 105 1 0 1 1 0 8 0 amappl5 104 443 0 432 1 0 1 1 0 8 0 amappl4 96 464 0 436 1 0 1 1 0 8 0 amappl3 88 134 0 128 1 0 1 1 0 8 0 amappl2 80 2771 0 2713 3 1 2 3 0 8 0 amappl1 72 17460 0 17065 27 18 9 20 0 8 0 amappl 80 978 0 935 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 443 0 428 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 443 0 428 1 0 1 1 0 8 0 vmmpekpl 168 6793 0 6767 2 0 2 2 0 8 0 vmmpepl 168 59554 0 57752 126 13 113 113 0 357 28 vmsppl 272 442 0 428 3 1 2 2 0 8 0 pdppl 4096 892 0 858 6 1 5 6 0 8 0 pvpl 32 181936 0 164883 179 5 174 179 0 265 30 pmappl 200 442 0 428 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 243 0 14 7 0 7 7 0 8 0