panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82687b98) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82687b98) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(1,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 m_getuio(ffff800023d87668,1,43cbc,ffff800023d87730) at m_getuio+0xbe sys/kern/uipc_socket.c:561 sosend(fffffd806ca48010,0,ffff800023d87730,0,0,80) at sosend+0x510 sys/kern/uipc_socket.c:511 sendit(ffff800020ab0508,b,ffff800023d87810,0,ffff800023d878f0) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff800020ab0508,ffff800023d878a8,ffff800023d878f0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800023d87970) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023d87970) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x343b5e5c7a0, 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 0xfffffd8067e4d900+16 0x0!=0x13453b7bf0a97493 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82687b98) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82687b98) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(1,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 m_getuio(ffff800023d87668,1,43cbc,ffff800023d87730) at m_getuio+0xbe sys/kern/uipc_socket.c:561 sosend(fffffd806ca48010,0,ffff800023d87730,0,0,80) at sosend+0x510 sys/kern/uipc_socket.c:511 sendit(ffff800020ab0508,b,ffff800023d87810,0,ffff800023d878f0) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff800020ab0508,ffff800023d878a8,ffff800023d878f0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800023d87970) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023d87970) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x343b5e5c7a0, count: -11 ddb{1}> show registers rdi 0xffffffff8175c767 db_enter+0x17 rsi 0x4ab6 __ALIGN_SIZE+0x3ab6 rbp 0xffff800023d873a0 rbx 0xffff800023d87450 rdx 0x4ab7 __ALIGN_SIZE+0x3ab7 rcx 0xffff800022d82000 rax 0xffff800022d82000 r8 0xffffffff8218361f kprintf+0x16f r9 0x1 r10 0x25 r11 0xfc978e97079ceeef r12 0x3000000008 r13 0xffff800023d873b0 r14 0x100 r15 0x1 rip 0xffffffff8175c768 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023d87390 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=39180 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab09f8,0xffff800020ab02a0 process=0xffff800020adc380 user=0xffff800023d82000, vmspace=0xfffffd807f0085c0 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14166 274072 11425 0 2 0 syz-executor.0 14166 144225 11425 0 7 0x4000000 syz-executor.0 70874 207032 67332 0 2 0 syz-executor.1 *70874 39180 67332 0 7 0x4000000 syz-executor.1 67332 99551 83392 0 2 0x482 syz-executor.1 11425 287908 83392 0 3 0x82 nanosleep syz-executor.0 83392 514013 7685 0 3 0x82 kqread syz-fuzzer 83392 360704 7685 0 3 0x4000082 nanosleep syz-fuzzer 83392 488510 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 138720 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 494698 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 224223 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 524059 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 458308 7685 0 3 0x4000082 nanosleep syz-fuzzer 83392 142334 7685 0 3 0x4000082 thrsleep syz-fuzzer 83392 357066 7685 0 3 0x4000082 thrsleep syz-fuzzer 7685 209052 7473 0 3 0x10008a pause ksh 7473 174162 54792 0 3 0x92 select sshd 54786 463520 1 0 3 0x100083 ttyin getty 54792 179088 1 0 3 0x80 select sshd 71832 342721 58304 74 3 0x100092 bpf pflogd 58304 474779 1 0 3 0x80 netio pflogd 21538 87712 33836 73 3 0x100090 kqread syslogd 33836 426578 1 0 3 0x100082 netio syslogd 98800 395155 1 77 3 0x100090 poll dhclient 33689 287277 1 0 3 0x80 poll dhclient 68543 458209 0 0 2 0x14200 zerothread 59516 500888 0 0 3 0x14200 aiodoned aiodoned 67985 352646 0 0 3 0x14200 syncer update 49620 230313 0 0 3 0x14200 cleaner cleaner 92918 409541 0 0 3 0x14200 reaper reaper 82551 363317 0 0 3 0x14200 pgdaemon pagedaemon 51684 405473 0 0 3 0x14200 bored crynlk 59185 590 0 0 3 0x14200 bored crypto 58684 423989 0 0 3 0x40014200 acpi0 acpi0 55300 92630 0 0 3 0x40014200 idle1 83907 108911 0 0 3 0x14200 bored softnet 57995 71225 0 0 3 0x14200 bored systqmp 35209 163046 0 0 3 0x14200 bored systq 85903 507111 0 0 3 0x40014200 bored softclock 98928 217310 0 0 3 0x40014200 idle0 39157 481897 0 0 3 0x14200 bored smr 1 370843 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 14166 (syz-executor.0) thread 0xffff800020ab0290 (274072) exclusive rwlock vmmaplk r = 0 (0xfffffd807f008a28) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5343 #3 uvmfault_lookup+0xbe sys/uvm/uvm_fault.c:1442 #4 uvm_fault+0xbbd uvmfault_amapcopy sys/uvm/uvm_fault.c:232 [inline] #4 uvm_fault+0xbbd sys/uvm/uvm_fault.c:559 #5 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 #6 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #7 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82649680) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 #2 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #3 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9485 6403K 7175K 78643K 10860 0 0 pcb 15 8K 8K 78643K 25 0 0 rtable 105 3K 3K 78643K 205 0 0 ifaddr 53 11K 12K 78643K 59 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1482 0 0 iov 0 0K 12K 78643K 9 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1230 77K 77K 78643K 1289 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 3 0 0 VM map 8 4K 4K 78643K 8 0 0 sem 12 1K 1K 78643K 21 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 6 17K 25K 78643K 66 0 0 proc 60 63K 95K 78643K 441 0 0 subproc 32 2K 2K 78643K 34 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 2 0 0 in_multi 33 2K 2K 78643K 35 0 0 ether_multi 1 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 30 132K 132K 78643K 30 0 0 exec 0 0K 1K 78643K 209 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 117 55K 55K 78643K 1132 0 0 UVM aobj 10 2K 2K 78643K 10 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 2 0 0 NDP 8 0K 0K 78643K 12 0 0 temp 89 3546K 3610K 78643K 3587 0 0 SYN cache 2 16K 16K 78643K 2 0 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 21 0 19 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 47 0 35 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 36 0 32 1 0 1 1 0 8 0 inpcb 280 96 0 87 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 16 0 0 1 0 1 1 0 8 0 pfstkey 112 16 0 0 1 0 1 1 0 8 0 pfstate 328 16 0 0 2 0 2 2 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 256 213 0 0 14 0 14 14 0 8 0 art_table 32 214 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1481 0 75 46 0 46 46 0 8 0 ffsino 272 1481 0 75 94 0 94 94 0 8 0 nchpl 144 1773 0 157 60 0 60 60 0 8 0 uvmvnodes 72 1588 0 0 29 0 29 29 0 8 0 vnodes 208 1588 0 0 84 0 84 84 0 8 0 namei 1024 4640 0 4640 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 552 6 0 0 1 0 1 1 0 8 0 scxspl 192 4913 0 4913 6 1 5 5 0 8 5 plimitpl 152 17 0 9 1 0 1 1 0 8 0 sigapl 432 264 0 248 3 0 3 3 0 8 1 futexpl 56 1003 0 1003 1 0 1 1 0 8 1 knotepl 112 55 0 36 1 0 1 1 0 8 0 kqueuepl 104 8 0 6 1 0 1 1 0 8 0 pipepl 160 152 0 133 1 0 1 1 0 8 0 fdescpl 488 265 0 248 3 0 3 3 0 8 0 filepl 152 1476 0 1370 5 0 5 5 0 8 0 lockfpl 104 34 0 33 1 0 1 1 0 8 0 lockfspl 48 14 0 13 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 67 0 58 1 0 1 1 0 8 0 zombiepl 144 248 0 248 1 0 1 1 0 8 1 processpl 896 280 0 248 4 0 4 4 0 8 0 procpl 632 362 0 319 4 0 4 4 0 8 0 sockpl 384 165 0 142 3 0 3 3 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 161 0 0 20 0 20 20 0 8 0 mtagpl 80 10 0 0 1 0 1 1 0 8 0 mbufpl 256 168 0 0 10 0 10 10 0 8 0 bufpl 256 8297 0 1310 437 0 437 437 0 8 0 anonpl 16 47418 0 28427 91 1 90 90 0 124 13 amapchunkpl 152 1350 0 1192 8 0 8 8 0 158 1 amappl16 192 1561 0 515 62 3 59 62 0 8 6 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 47 0 43 1 0 1 1 0 8 0 amappl13 168 17 0 14 1 0 1 1 0 8 0 amappl12 160 4 0 4 1 1 0 1 0 8 0 amappl11 152 75 0 58 1 0 1 1 0 8 0 amappl10 144 13 0 7 1 0 1 1 0 8 0 amappl9 136 601 0 597 1 0 1 1 0 8 0 amappl8 128 180 0 148 2 0 2 2 0 8 0 amappl7 120 39 0 36 1 0 1 1 0 8 0 amappl6 112 78 0 69 1 0 1 1 0 8 0 amappl5 104 130 0 116 1 0 1 1 0 8 0 amappl4 96 525 0 489 2 1 1 2 0 8 0 amappl3 88 112 0 107 1 0 1 1 0 8 0 amappl2 80 1206 0 1124 3 1 2 3 0 8 0 amappl1 72 15771 0 15321 26 14 12 20 0 8 2 amappl 80 621 0 572 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 271 0 248 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 271 0 248 1 0 1 1 0 8 0 vmmpekpl 168 6150 0 6115 2 0 2 2 0 8 0 vmmpepl 168 40295 0 37988 137 6 131 131 0 357 30 vmsppl 368 264 0 248 2 0 2 2 0 8 0 pdppl 4096 549 0 502 7 0 7 7 0 8 1 pvpl 32 149607 0 127251 209 0 209 209 0 265 28 pmappl 232 270 0 248 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 598 0 3 17 0 17 17 0 8 0