panic(ffffffff821f4191) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82678d08) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82678d08) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82678d08,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806f6f1190,fffffd806f6f1218,ffffffff822edd38,fffffd807ca2d200,0) at sbappendaddr+0x223 sys/kern/uipc_socket2.c:801 rtm_sendup(fffffd806f6f1190,fffffd807ca2d200,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd807ca2d200,0,0) at route_input+0x489 sys/net/rtsock.c:572 if_linkstate_task(9) at if_linkstate_task+0x137 if_linkstate sys/net/if.c:1678 [inline] if_linkstate_task(9) at if_linkstate_task+0x137 sys/net/if.c:1665 taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: 5 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f340400+16 0x0!=0xe01b85b6e376ba44 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f4191) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82678d08) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82678d08) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82678d08,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806f6f1190,fffffd806f6f1218,ffffffff822edd38,fffffd807ca2d200,0) at sbappendaddr+0x223 sys/kern/uipc_socket2.c:801 rtm_sendup(fffffd806f6f1190,fffffd807ca2d200,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd807ca2d200,0,0) at route_input+0x489 sys/net/rtsock.c:572 if_linkstate_task(9) at if_linkstate_task+0x137 if_linkstate sys/net/if.c:1678 [inline] if_linkstate_task(9) at if_linkstate_task+0x137 sys/net/if.c:1665 taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e39140 rbx 0xffff800020e391f0 rdx 0xffff800020e189c0 rcx 0 rax 0 r8 0xffffffff8178384f kprintf+0x16f r9 0x1 r10 0x25 r11 0x8b40ea6037b3e9ae r12 0x3000000008 r13 0xffff800020e39150 r14 0x100 r15 0x1 rip 0xffffffff819f29d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e39130 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softnet) pid=134425 stat=onproc flags process=14000 proc=200 pri=32, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff800020e18270,0xffff800020e18c40 process=0xffff800020e1a000 user=0xffff800020e34000, vmspace=0xffffffff8263e910 estcpu=4, cpticks=14, pctcpu=1.27 user=0, sys=14, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 84490 499031 28319 0 2 0 syz-executor.0 84490 93408 28319 0 3 0x4000080 fsleep syz-executor.0 84490 87321 28319 0 3 0x4000080 pipewr syz-executor.0 20407 225042 98806 0 2 0 syz-executor.1 20407 458739 98806 0 2 0x4000000 syz-executor.1 20407 166946 98806 0 3 0x4000080 fsleep syz-executor.1 98806 16216 31321 0 3 0x82 nanosleep syz-executor.1 28319 345793 31321 0 3 0x82 nanosleep syz-executor.0 31321 499380 18199 0 3 0x82 kqread syz-fuzzer 31321 302659 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 326316 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 380363 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 112992 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 211347 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 70638 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 365289 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 343770 18199 0 3 0x4000082 thrsleep syz-fuzzer 31321 75706 18199 0 3 0x4000082 thrsleep syz-fuzzer 18199 510837 30414 0 3 0x10008a pause ksh 30414 209772 28653 0 3 0x92 select sshd 78582 95045 1 0 3 0x100083 ttyin getty 28653 162066 1 0 3 0x80 select sshd 26319 512592 85076 74 3 0x100092 bpf pflogd 85076 216514 1 0 3 0x80 netio pflogd 29977 338784 38010 73 3 0x100090 kqread syslogd 38010 112311 1 0 3 0x100082 netio syslogd 65833 220748 1 77 7 0x100010 dhclient 41143 262036 1 0 3 0x80 poll dhclient 87239 467562 0 0 3 0x14200 bored smr 40150 101188 0 0 3 0x14200 pgzero zerothread 6920 258892 0 0 3 0x14200 aiodoned aiodoned 27389 141736 0 0 3 0x14200 syncer update 65894 288081 0 0 3 0x14200 cleaner cleaner 25332 165970 0 0 3 0x14200 reaper reaper 97958 275988 0 0 3 0x14200 pgdaemon pagedaemon 17693 501853 0 0 3 0x14200 bored crynlk 33421 306323 0 0 3 0x14200 bored crypto 1010 493080 0 0 3 0x40014200 acpi0 acpi0 4011 110073 0 0 3 0x40014200 idle1 * 7863 134425 0 0 7 0x14200 softnet 46626 361097 0 0 3 0x14200 bored systqmp 19813 137043 0 0 3 0x14200 bored systq 18041 328088 0 0 3 0x40014200 bored softclock 77831 161759 0 0 3 0x40014200 idle0 1 375690 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 7863 (softnet) thread 0xffff800020e189c0 (134425) exclusive rwlock netlock r = 0 (0xffffffff825310c8) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 if_linkstate_task+0x35 #2 taskq_thread+0x9c sys/kern/kern_task.c:369 #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 1 (0xffffffff826739f0) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 if_linkstate_task+0x29 sys/net/if.c:1661 #2 taskq_thread+0x9c sys/kern/kern_task.c:369 #3 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff80000002b0e0) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9493 6468K 6531K 78643K 10618 0 pcb 13 8K 8K 78643K 27 0 rtable 103 3K 3K 78643K 228 0 ifaddr 54 12K 12K 78643K 62 0 counters 45 34K 34K 78643K 47 0 ioctlops 0 0K 4K 78643K 1471 0 iov 0 0K 12K 78643K 4 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1246 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 7 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 61 0 proc 60 63K 95K 78643K 447 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 3 0 in_multi 33 2K 2K 78643K 38 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 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 212 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 101 21K 33K 78643K 1092 0 UVM aobj 5 2K 2K 78643K 6 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 10 0 NDP 8 0K 0K 78643K 13 0 temp 78 3036K 3100K 78643K 2132 0 kqueue 3 4K 8K 78643K 5 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 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 51 0 8 2 0 2 2 0 8 0 unpcb 120 37 0 27 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 556 0 556 1 0 1 1 0 8 1 tcpcb 544 28 0 24 1 0 1 1 0 8 0 inpcb 280 78 0 71 1 0 1 1 0 8 0 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 6 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 256 190 0 3 12 0 12 12 0 8 0 art_table 32 191 0 3 2 0 2 2 0 8 0 art_node 16 50 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1477 0 67 46 0 46 46 0 8 0 ffsino 272 1477 0 67 95 0 95 95 0 8 0 nchpl 144 1743 0 134 61 0 61 61 0 8 0 uvmvnodes 72 1531 0 0 28 0 28 28 0 8 0 vnodes 208 1531 0 0 81 0 81 81 0 8 0 namei 1024 4467 0 4467 2 1 1 1 0 8 1 percpumem 16 34 0 1 1 0 1 1 0 8 0 vmpool 560 2 0 2 1 0 1 1 0 8 1 scxspl 192 5038 0 5038 2 1 1 2 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 276 0 244 4 0 4 4 0 8 0 futexpl 56 562 0 560 1 0 1 1 0 8 0 knotepl 112 56 0 37 1 0 1 1 0 8 0 kqueuepl 144 8 0 6 1 0 1 1 0 8 0 pipelkpl 48 123 0 105 1 0 1 1 0 8 0 pipepl 120 246 0 211 2 0 2 2 0 8 0 fdescpl 496 261 0 244 3 0 3 3 0 8 0 filepl 152 1405 0 1284 7 1 6 6 0 8 1 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 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 96 0 87 1 0 1 1 0 8 0 zombiepl 144 244 0 244 2 1 1 1 0 8 1 processpl 984 276 0 244 6 1 5 5 0 8 0 procpl 624 352 0 307 4 0 4 4 0 8 0 sockpl 400 136 0 117 4 1 3 3 0 8 1 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 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 152 0 0 18 0 18 18 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 182 0 0 11 0 11 11 0 8 0 bufpl 280 4097 0 174 281 0 281 281 0 8 0 anonpl 16 38767 0 24211 60 1 59 59 0 124 0 amapchunkpl 152 1140 0 999 8 0 8 8 0 158 2 amappl16 192 1021 0 227 40 0 40 40 0 8 0 amappl15 184 3 0 1 1 0 1 1 0 8 0 amappl14 176 3 0 2 2 1 1 1 0 8 0 amappl13 168 40 0 37 1 0 1 1 0 8 0 amappl12 160 7 0 7 1 1 0 1 0 8 0 amappl11 152 70 0 51 1 0 1 1 0 8 0 amappl10 144 22 0 17 1 0 1 1 0 8 0 amappl9 136 388 0 385 1 0 1 1 0 8 0 amappl8 128 295 0 282 1 0 1 1 0 8 0 amappl7 120 128 0 116 1 0 1 1 0 8 0 amappl6 112 24 0 20 1 0 1 1 0 8 0 amappl5 104 161 0 145 1 0 1 1 0 8 0 amappl4 96 513 0 482 2 1 1 2 0 8 0 amappl3 88 107 0 100 1 0 1 1 0 8 0 amappl2 80 1162 0 1086 3 1 2 3 0 8 0 amappl1 72 15856 0 15387 25 12 13 20 0 8 3 amappl 80 597 0 550 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 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 263 0 246 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 263 0 246 1 0 1 1 0 8 0 vmmpekpl 168 6141 0 6110 2 0 2 2 0 8 0 vmmpepl 168 38935 0 36902 111 6 105 105 0 357 16 vmsppl 368 262 0 246 2 0 2 2 0 8 0 pdppl 4096 534 0 492 6 0 6 6 0 8 0 pvpl 32 137273 0 119484 146 2 144 144 0 265 0 pmappl 232 262 0 246 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 165 0 5 5 0 5 5 0 8 0