panic(ffffffff821c79eb) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82620620) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82620620) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get(ffffffff82620620,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800020afb4f8,0,2d5c,ffff800020afb678) at m_getuio+0xe4 sys/kern/uipc_socket.c:556 sosend(fffffd806eb50a88,0,ffff800020afb678,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:511 dofilewritev(ffff800020ad1b38,4,ffff800020afb678,0,ffff800020afb760) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ad1b38,ffff800020afb710,ffff800020afb760) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800020afb7e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020afb7e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbd530, count: 4 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f0d2100+16 0x0!=0x967432ea53a637ec ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c79eb) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82620620) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82620620) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get(ffffffff82620620,1) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800020afb4f8,0,2d5c,ffff800020afb678) at m_getuio+0xe4 sys/kern/uipc_socket.c:556 sosend(fffffd806eb50a88,0,ffff800020afb678,0,0,80) at sosend+0x54e sys/kern/uipc_socket.c:511 dofilewritev(ffff800020ad1b38,4,ffff800020afb678,0,ffff800020afb760) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ad1b38,ffff800020afb710,ffff800020afb760) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800020afb7e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020afb7e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbd530, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020afb220 rbx 0xffff800020afb2d0 rdx 0xffff800020ad1b38 rcx 0 rax 0 r8 0xffffffff81fabf4f kprintf+0x16f r9 0x1 r10 0x25 r11 0xe241f4a34537db5f r12 0x3000000008 r13 0xffff800020afb230 r14 0x100 r15 0x1 rip 0xffffffff81912838 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afb210 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=425168 stat=onproc flags process=12 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad0010,0xffff800020ad0510 process=0xffff800020a9bc50 user=0xffff800020af6000, vmspace=0xfffffd806e7af5c8 estcpu=1, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42483 134672 7100 0 7 0 syz-executor.0 91373 514941 56447 0 2 0 syz-executor.1 91373 411429 56447 0 3 0x4000080 fsleep syz-executor.1 56447 75377 97412 0 2 0x482 syz-executor.1 7100 476307 97412 0 2 0x482 syz-executor.0 97412 78328 58453 0 3 0x82 thrsleep syz-fuzzer 97412 443812 58453 0 2 0x4000482 syz-fuzzer 97412 193954 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 273703 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 46484 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 516099 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 173894 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 426248 58453 0 2 0x4000482 syz-fuzzer 97412 459816 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 124417 58453 0 3 0x4000082 thrsleep syz-fuzzer 97412 432475 58453 0 3 0x4000082 kqread syz-fuzzer 58453 315250 95248 0 3 0x10008a pause ksh *95248 425168 85331 0 7 0x12 sshd 53938 487447 1 0 3 0x100083 ttyin getty 85331 115065 1 0 3 0x80 select sshd 35122 101936 74898 74 3 0x100092 bpf pflogd 74898 374140 1 0 3 0x80 netio pflogd 56712 103431 54752 73 3 0x100090 kqread syslogd 54752 414256 1 0 3 0x100082 netio syslogd 76072 168531 1 77 3 0x100090 poll dhclient 69602 28093 1 0 3 0x80 poll dhclient 91169 475035 0 0 2 0x14200 zerothread 7980 113321 0 0 3 0x14200 aiodoned aiodoned 74865 181250 0 0 3 0x14200 syncer update 53028 266456 0 0 3 0x14200 cleaner cleaner 22383 362932 0 0 3 0x14200 reaper reaper 75037 241737 0 0 3 0x14200 pgdaemon pagedaemon 57933 501176 0 0 3 0x14200 bored crynlk 20597 127169 0 0 3 0x14200 bored crypto 17514 399402 0 0 3 0x40014200 acpi0 acpi0 8827 394757 0 0 3 0x40014200 idle1 91117 404671 0 0 2 0x14200 softnet 66703 21296 0 0 3 0x14200 bored systqmp 55541 412753 0 0 3 0x14200 bored systq 87133 216109 0 0 3 0x40014200 bored softclock 97711 124688 0 0 3 0x40014200 idle0 61964 481284 0 0 3 0x14200 bored smr 1 142623 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9479 6401K 6659K 78643K 10625 0 pcb 13 8K 8K 78643K 22 0 rtable 105 3K 3K 78643K 205 0 ifaddr 49 11K 11K 78643K 54 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 2K 78643K 2 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 77K 78643K 1238 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 8 0K 0K 78643K 8 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 56 0 proc 59 63K 83K 78643K 438 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 30 132K 132K 78643K 30 0 exec 0 0K 1K 78643K 209 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 122 22K 23K 78643K 1113 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 7 0K 0K 78643K 11 0 temp 79 3025K 3089K 78643K 3530 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 39 0 29 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 20 0 20 1 0 1 1 0 8 1 tcpcb 544 15 0 11 1 0 1 1 0 8 0 inpcb 280 89 0 82 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 11 0 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 328 11 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 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 1456 0 50 46 0 46 46 0 8 0 ffsino 272 1456 0 50 94 0 94 94 0 8 0 nchpl 144 1709 0 93 61 0 61 61 0 8 1 uvmvnodes 72 1513 0 0 28 0 28 28 0 8 0 vnodes 208 1513 0 0 80 0 80 80 0 8 0 namei 1024 4399 0 4399 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4581 0 4581 2 1 1 2 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 432 255 0 239 3 0 3 3 0 8 1 futexpl 56 412 0 411 1 0 1 1 0 8 0 knotepl 112 57 0 38 1 0 1 1 0 8 0 kqueuepl 104 4 0 2 1 0 1 1 0 8 0 pipepl 160 160 0 141 2 0 2 2 0 8 1 fdescpl 488 256 0 239 3 0 3 3 0 8 0 filepl 152 1321 0 1220 5 0 5 5 0 8 1 lockfpl 104 24 0 23 1 0 1 1 0 8 0 lockfspl 48 8 0 7 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 63 0 54 1 0 1 1 0 8 0 zombiepl 144 239 0 239 1 0 1 1 0 8 1 processpl 904 271 0 239 4 0 4 4 0 8 0 procpl 632 331 0 288 4 0 4 4 0 8 0 sockpl 384 147 0 128 3 0 3 3 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 162 0 0 20 0 20 20 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 165 0 0 10 0 10 10 0 8 0 bufpl 280 6284 0 1340 354 0 354 354 0 8 0 anonpl 16 41606 0 23777 73 1 72 72 0 125 0 amapchunkpl 152 1178 0 1033 8 0 8 8 0 158 1 amappl16 192 1137 0 159 50 0 50 50 0 8 0 amappl15 184 58 0 55 1 0 1 1 0 8 0 amappl14 176 48 0 42 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 10 0 8 2 1 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 21 0 12 1 0 1 1 0 8 0 amappl9 136 609 0 605 1 0 1 1 0 8 0 amappl8 128 140 0 113 2 0 2 2 0 8 1 amappl7 120 106 0 94 1 0 1 1 0 8 0 amappl6 112 59 0 52 1 0 1 1 0 8 0 amappl5 104 131 0 118 1 0 1 1 0 8 0 amappl4 96 499 0 468 2 0 2 2 0 8 1 amappl3 88 137 0 126 1 0 1 1 0 8 0 amappl2 80 1129 0 1051 3 0 3 3 0 8 1 amappl1 72 15669 0 15213 26 7 19 21 0 8 8 amappl 80 583 0 535 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 256 0 239 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 256 0 239 1 0 1 1 0 8 0 vmmpekpl 168 5874 0 5841 2 0 2 2 0 8 0 vmmpepl 168 39449 0 37208 134 5 129 129 0 357 31 vmsppl 368 255 0 239 2 0 2 2 0 8 0 pdppl 4096 519 0 478 6 0 6 6 0 8 0 pvpl 32 138998 0 118014 171 0 171 171 0 265 1 pmappl 232 255 0 239 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 163 0 3 5 0 5 5 0 8 0