panic(ffffffff821ece0a) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82647668) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82647668) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82647668,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 mld6_sendpkt(ffff800000a1a480,84,ffffffff824e33c0) at mld6_sendpkt+0x8e sys/netinet6/mld6.c:405 in6_delmulti(ffff800000a1a480) at in6_delmulti+0xbb sys/netinet6/in6.c:1092 in6_purgeaddr(ffff8000009d2e00) at in6_purgeaddr+0x195 in6_leavegroup sys/netinet6/in6.c:1154 [inline] in6_purgeaddr(ffff8000009d2e00) at in6_purgeaddr+0x195 sys/netinet6/in6.c:925 ifnewlladdr(ffff8000009cf000) at ifnewlladdr+0x108 sys/net/if.c:3146 ifioctl(fffffd806b81fe20,8020691f,ffff800022792f60,ffff800020ad7d58) at ifioctl+0x1b3e sys/net/if.c:2204 soo_ioctl(fffffd80657c3610,8020691f,ffff800022792f60,ffff800020ad7d58) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ad7d58,ffff800022793078,ffff8000227930c0) at sys_ioctl+0x4a5 syscall(ffff800022793140) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022793140) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x57d1ec3da0, count: 1 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 0xfffffd806f720600+16 0x0!=0x4dffc1cf9e6cd27 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821ece0a) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82647668) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82647668) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82647668,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 mld6_sendpkt(ffff800000a1a480,84,ffffffff824e33c0) at mld6_sendpkt+0x8e sys/netinet6/mld6.c:405 in6_delmulti(ffff800000a1a480) at in6_delmulti+0xbb sys/netinet6/in6.c:1092 in6_purgeaddr(ffff8000009d2e00) at in6_purgeaddr+0x195 in6_leavegroup sys/netinet6/in6.c:1154 [inline] in6_purgeaddr(ffff8000009d2e00) at in6_purgeaddr+0x195 sys/netinet6/in6.c:925 ifnewlladdr(ffff8000009cf000) at ifnewlladdr+0x108 sys/net/if.c:3146 ifioctl(fffffd806b81fe20,8020691f,ffff800022792f60,ffff800020ad7d58) at ifioctl+0x1b3e sys/net/if.c:2204 soo_ioctl(fffffd80657c3610,8020691f,ffff800022792f60,ffff800020ad7d58) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ad7d58,ffff800022793078,ffff8000227930c0) at sys_ioctl+0x4a5 syscall(ffff800022793140) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022793140) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x57d1ec3da0, count: -14 ddb{1}> show registers rdi 0xffffffff81030db7 db_enter+0x17 rsi 0x46c7 __ALIGN_SIZE+0x36c7 rbp 0xffff800022792910 rbx 0xffff8000227929c0 rdx 0x46c8 __ALIGN_SIZE+0x36c8 rcx 0xffff800020b7e000 rax 0xffff800020b7e000 r8 0xffffffff8164a22f kprintf+0x16f r9 0x1 r10 0x25 r11 0xc2e7cd6b826ce1ad r12 0x3000000008 r13 0xffff800022792920 r14 0x100 r15 0x1 rip 0xffffffff81030db8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022792900 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=94249 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=63, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad7128,0xffff800020ad7618 process=0xffff800020a9d2e0 user=0xffff80002278e000, vmspace=0xfffffd807f000a10 estcpu=26, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37618 278648 6723 0 2 0 syz-executor.1 37618 451516 6723 0 7 0x4000000 syz-executor.1 21280 219067 20393 0 2 0 syz-executor.0 *21280 94249 20393 0 7 0x4000000 syz-executor.0 67937 341061 0 0 3 0x14200 bored sosplice 6723 393987 79844 0 3 0x82 nanosleep syz-executor.1 20393 409830 79844 0 3 0x82 nanosleep syz-executor.0 79844 219259 25286 0 3 0x82 kqread syz-fuzzer 79844 193009 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 80503 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 430003 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 216305 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 208551 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 242595 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 388931 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 186536 25286 0 3 0x4000082 thrsleep syz-fuzzer 79844 377680 25286 0 3 0x4000082 thrsleep syz-fuzzer 25286 55064 78013 0 3 0x10008a pause ksh 78013 455377 57386 0 3 0x92 select sshd 46345 318781 1 0 3 0x100083 ttyin getty 57386 285666 1 0 3 0x80 select sshd 92651 94750 18002 74 3 0x100092 bpf pflogd 18002 15707 1 0 3 0x80 netio pflogd 56193 341028 16622 73 3 0x100090 kqread syslogd 16622 421732 1 0 3 0x100082 netio syslogd 37784 107723 1 77 3 0x100090 poll dhclient 25599 435844 1 0 3 0x80 poll dhclient 94353 500637 0 0 3 0x14200 bored smr 42423 453316 0 0 2 0x14200 zerothread 15449 449871 0 0 3 0x14200 aiodoned aiodoned 95725 368893 0 0 3 0x14200 syncer update 35083 147170 0 0 3 0x14200 cleaner cleaner 27323 20235 0 0 3 0x14200 reaper reaper 41574 471962 0 0 3 0x14200 pgdaemon pagedaemon 64295 182208 0 0 3 0x14200 bored crynlk 85867 218925 0 0 3 0x14200 bored crypto 80814 479369 0 0 3 0x40014200 acpi0 acpi0 97600 345750 0 0 3 0x40014200 idle1 2759 329064 0 0 3 0x14200 bored softnet 16982 334269 0 0 3 0x14200 bored systqmp 93371 34564 0 0 3 0x14200 bored systq 24996 242910 0 0 3 0x40014200 bored softclock 30257 47611 0 0 3 0x40014200 idle0 1 57635 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff8263b918) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 sleep_setup+0xe9 sys/kern/kern_synch.c:393 #2 msleep+0xe2 sleep_setup_timeout sys/kern/kern_synch.c:432 [inline] #2 msleep+0xe2 sys/kern/kern_synch.c:261 #3 taskq_next_work+0xbe sys/kern/kern_task.c:323 #4 taskq_thread+0xe5 sys/kern/kern_task.c:366 #5 proc_trampoline+0x1c Process 21280 (syz-executor.0) thread 0xffff800020ad7d58 (94249) exclusive rwlock netlock r = 0 (0xffffffff8249c838) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 ifioctl+0x117b sys/net/if.c:2187 #2 soo_ioctl+0x27c sys/kern/sys_socket.c:138 #3 sys_ioctl+0x4a5 #4 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82638db0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 soo_ioctl+0x26a sys/kern/sys_socket.c:138 #2 sys_ioctl+0x4a5 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9502 6410K 6665K 78643K 10712 0 pcb 13 8K 8K 78643K 33 0 rtable 96 3K 4K 78643K 223 0 ifaddr 60 12K 12K 78643K 67 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1471 0 iov 0 0K 16K 78643K 14 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1279 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 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 90 0 sigio 0 0K 0K 78643K 2 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 7 0 in_multi 25 1K 2K 78643K 42 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 207 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 113 22K 22K 78643K 1211 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 12 0 NDP 10 0K 0K 78643K 14 0 temp 83 3012K 3076K 78643K 2243 0 kqueue 3 4K 6K 78643K 5 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 23 0 21 1 0 1 1 0 8 0 rtentry 112 45 0 7 2 0 2 2 0 8 0 unpcb 120 59 0 47 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpqe 32 136 0 136 1 0 1 1 0 8 1 tcpcb 544 39 0 34 1 0 1 1 0 8 0 inpcb 280 168 0 156 2 0 2 2 0 8 1 nd6 48 6 0 3 1 0 1 1 0 8 0 pffrag 232 2 0 2 1 0 1 1 0 482 1 pffrnode 88 2 0 2 1 0 1 1 0 8 1 pffrent 40 90 0 90 1 0 1 1 0 8 1 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 30 0 0 1 0 1 1 0 8 0 pfstkey 112 30 0 0 1 0 1 1 0 8 0 pfstate 328 30 0 0 3 0 3 3 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 256 188 0 32 12 0 12 12 0 8 0 art_table 32 189 0 32 2 0 2 2 0 8 0 art_node 16 44 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 8 0 0 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 1501 0 91 46 0 46 46 0 8 0 ffsino 272 1501 0 91 95 0 95 95 0 8 0 nchpl 144 1808 0 192 61 0 61 61 0 8 0 uvmvnodes 72 1594 0 0 29 0 29 29 0 8 0 vnodes 208 1594 0 0 84 0 84 84 0 8 0 namei 1024 4728 0 4728 1 0 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 5464 0 5464 8 1 7 7 0 8 7 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 306 0 273 4 0 4 4 0 8 0 futexpl 56 1178 0 1178 1 0 1 1 0 8 1 knotepl 112 57 0 38 1 0 1 1 0 8 0 kqueuepl 144 18 0 16 1 0 1 1 0 8 0 pipelkpl 48 92 0 81 1 0 1 1 0 8 0 pipepl 120 184 0 163 2 0 2 2 0 8 1 fdescpl 496 290 0 273 3 0 3 3 0 8 0 filepl 152 1616 0 1508 5 0 5 5 0 8 0 lockfpl 104 23 0 22 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 22 0 11 1 0 1 1 0 8 0 ucredpl 96 113 0 103 1 0 1 1 0 8 0 zombiepl 144 273 0 273 1 0 1 1 0 8 1 processpl 960 306 0 273 5 0 5 5 0 8 0 procpl 624 450 0 406 4 0 4 4 0 8 0 sockpl 400 252 0 226 4 0 4 4 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 169 0 0 21 0 21 21 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 256 0 0 16 0 16 16 0 8 0 bufpl 280 4125 0 174 283 0 283 283 0 8 0 anonpl 16 42523 0 26037 68 1 67 67 0 124 0 amapchunkpl 152 1457 0 1317 8 0 8 8 0 158 1 amappl16 192 1275 0 370 46 0 46 46 0 8 0 amappl15 184 2 0 1 1 0 1 1 0 8 0 amappl14 176 5 0 4 2 1 1 1 0 8 0 amappl13 168 25 0 24 1 0 1 1 0 8 0 amappl12 160 32 0 29 2 1 1 1 0 8 0 amappl11 152 71 0 53 1 0 1 1 0 8 0 amappl10 144 15 0 10 1 0 1 1 0 8 0 amappl9 136 382 0 379 1 0 1 1 0 8 0 amappl8 128 315 0 293 1 0 1 1 0 8 0 amappl7 120 127 0 115 1 0 1 1 0 8 0 amappl6 112 28 0 23 1 0 1 1 0 8 0 amappl5 104 203 0 185 1 0 1 1 0 8 0 amappl4 96 499 0 467 2 1 1 2 0 8 0 amappl3 88 108 0 101 1 0 1 1 0 8 0 amappl2 80 1422 0 1343 3 1 2 3 0 8 0 amappl1 72 16522 0 16077 25 10 15 20 0 8 5 amappl 80 699 0 653 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 24 290 0 273 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 290 0 273 1 0 1 1 0 8 0 vmmpekpl 168 6195 0 6159 2 0 2 2 0 8 0 vmmpepl 168 42887 0 40751 119 3 116 116 0 357 23 vmsppl 368 289 0 273 2 0 2 2 0 8 0 pdppl 4096 587 0 546 6 0 6 6 0 8 0 pvpl 32 145868 0 125831 165 0 165 165 0 265 3 pmappl 232 289 0 273 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 173 0 3 5 0 5 5 0 8 0