panic(ffffffff821ce89a) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82644930) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82644930) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82644930,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 mld6_sendpkt(ffff8000009c2d00,84,ffffffff8248dc30) at mld6_sendpkt+0xaf sys/netinet6/mld6.c:410 in6_delmulti(ffff8000009c2d00) at in6_delmulti+0xbb sys/netinet6/in6.c:1092 in6_purgeaddr(ffff8000009d2700) at in6_purgeaddr+0x195 in6_leavegroup sys/netinet6/in6.c:1154 [inline] in6_purgeaddr(ffff8000009d2700) at in6_purgeaddr+0x195 sys/netinet6/in6.c:925 ifnewlladdr(ffff8000009ce000) at ifnewlladdr+0x108 sys/net/if.c:3146 ifioctl(fffffd806ca1f7e0,8020691f,ffff800021b8bd00,ffff800020ac3608) at ifioctl+0x1b3e sys/net/if.c:2204 sys_ioctl(ffff800020ac3608,ffff800021b8be18,ffff800021b8be60) at sys_ioctl+0x498 syscall(ffff800021b8bee0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021b8bee0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xadbbceb1750, count: 2 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 0xfffffd806d687c00+16 0x0!=0xfce95a3b91ed0e01 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821ce89a) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82644930) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82644930) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82644930,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 mld6_sendpkt(ffff8000009c2d00,84,ffffffff8248dc30) at mld6_sendpkt+0xaf sys/netinet6/mld6.c:410 in6_delmulti(ffff8000009c2d00) at in6_delmulti+0xbb sys/netinet6/in6.c:1092 in6_purgeaddr(ffff8000009d2700) at in6_purgeaddr+0x195 in6_leavegroup sys/netinet6/in6.c:1154 [inline] in6_purgeaddr(ffff8000009d2700) at in6_purgeaddr+0x195 sys/netinet6/in6.c:925 ifnewlladdr(ffff8000009ce000) at ifnewlladdr+0x108 sys/net/if.c:3146 ifioctl(fffffd806ca1f7e0,8020691f,ffff800021b8bd00,ffff800020ac3608) at ifioctl+0x1b3e sys/net/if.c:2204 sys_ioctl(ffff800020ac3608,ffff800021b8be18,ffff800021b8be60) at sys_ioctl+0x498 syscall(ffff800021b8bee0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021b8bee0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xadbbceb1750, count: -13 ddb{0}> show registers rdi 0xffffffff82136d47 db_enter+0x17 rsi 0x6629 __ALIGN_SIZE+0x5629 rbp 0xffff800021b8b720 rbx 0xffff800021b8b7d0 rdx 0x662a __ALIGN_SIZE+0x562a rcx 0xffff800020b80000 rax 0xffff800020b80000 r8 0xffffffff81e4d88f kprintf+0x16f r9 0x1 r10 0x25 r11 0x121fa91bfd15f2aa r12 0x3000000008 r13 0xffff800021b8b730 r14 0x100 r15 0x1 rip 0xffffffff82136d48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b8b710 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=62079 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac29d8,0xffff800020ac2298 process=0xffff800020aa96a0 user=0xffff800021b86000, vmspace=0xfffffd807f0002e0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24868 397772 64780 0 2 0 syz-executor.1 24868 385693 64780 0 3 0x4000080 fsleep syz-executor.1 24868 38961 64780 0 7 0x4000000 syz-executor.1 75641 179199 71804 0 2 0 syz-executor.0 *75641 62079 71804 0 7 0x4000000 syz-executor.0 70282 396695 0 0 3 0x14200 bored sosplice 64780 334734 63506 0 3 0x82 nanosleep syz-executor.1 71804 119777 63506 0 3 0x82 nanosleep syz-executor.0 63506 73433 8140 0 3 0x82 thrsleep syz-fuzzer 63506 42998 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 505881 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 421018 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 441421 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 341172 8140 0 3 0x4000082 kqread syz-fuzzer 63506 208132 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 428378 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 194369 8140 0 3 0x4000082 thrsleep syz-fuzzer 63506 59471 8140 0 3 0x4000082 thrsleep syz-fuzzer 8140 19748 65705 0 3 0x10008a pause ksh 65705 399471 20684 0 3 0x92 select sshd 75335 490204 1 0 3 0x100083 ttyin getty 20684 374563 1 0 3 0x80 select sshd 92791 488216 87495 74 3 0x100092 bpf pflogd 87495 16607 1 0 3 0x80 netio pflogd 31863 272367 70257 73 3 0x100090 kqread syslogd 70257 244886 1 0 3 0x100082 netio syslogd 57308 115153 1 77 3 0x100090 poll dhclient 85838 334970 1 0 3 0x80 poll dhclient 57903 319062 0 0 2 0x14200 zerothread 12561 461657 0 0 3 0x14200 aiodoned aiodoned 71062 124726 0 0 3 0x14200 syncer update 67454 370677 0 0 3 0x14200 cleaner cleaner 79889 429264 0 0 3 0x14200 reaper reaper 86160 195268 0 0 3 0x14200 pgdaemon pagedaemon 80424 79585 0 0 3 0x14200 bored crynlk 55279 301070 0 0 3 0x14200 bored crypto 70103 46312 0 0 3 0x40014200 acpi0 acpi0 63991 333973 0 0 3 0x40014200 idle1 91059 421906 0 0 3 0x14200 bored softnet 20603 479068 0 0 3 0x14200 bored systqmp 98128 251712 0 0 3 0x14200 bored systq 25644 408434 0 0 3 0x40014200 bored softclock 10586 332398 0 0 3 0x40014200 idle0 59062 160655 0 0 3 0x14200 bored smr 1 224707 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82638cd8) #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 75641 (syz-executor.0) thread 0xffff800020ac3608 (62079) exclusive rwlock netlock r = 0 (0xffffffff824a4618) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 ifioctl+0x117b sys/net/if.c:2187 #2 sys_ioctl+0x498 #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 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826494e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9502 6410K 6797K 78643K 10849 0 pcb 15 8K 8K 78643K 51 0 rtable 99 3K 3K 78643K 270 0 ifaddr 67 14K 15K 78643K 106 0 counters 43 33K 34K 78643K 55 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 16K 78643K 29 0 mount 1 1K 1K 78643K 1 0 vnodes 1223 77K 77K 78643K 1314 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 26 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 167 0 sigio 0 0K 0K 78643K 6 0 proc 61 63K 83K 78643K 463 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 45 0 in_multi 47 2K 3K 78643K 66 0 ether_multi 1 0K 0K 78643K 7 0 mrt 0 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 220 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 111 21K 38K 78643K 1495 0 UVM aobj 10 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 32 0 NDP 10 0K 0K 78643K 20 0 temp 91 3010K 3074K 78643K 2876 0 kqueue 3 4K 6K 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 1 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 52 0 11 2 0 2 2 0 8 0 unpcb 120 172 0 161 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 341 0 341 1 1 0 1 0 8 0 tcpcb 544 56 0 52 1 0 1 1 0 8 0 inpcb 280 242 0 229 2 0 2 2 0 8 1 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 4 0 2 1 0 1 1 0 8 0 pffrag 232 4 0 4 1 1 0 1 0 482 0 pffrnode 88 4 0 4 1 1 0 1 0 8 0 pffrent 40 94 0 94 1 1 0 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 35 0 0 1 0 1 1 0 8 0 pfstkey 112 35 0 0 1 0 1 1 0 8 0 pfstate 328 35 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 256 226 0 33 15 0 15 15 0 8 1 art_table 32 227 0 33 2 0 2 2 0 8 0 art_node 16 51 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 24 0 14 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 1641 0 231 46 0 46 46 0 8 0 ffsino 272 1641 0 231 95 0 95 95 0 8 0 nchpl 144 2152 0 533 61 0 61 61 0 8 0 uvmvnodes 72 1742 0 0 32 0 32 32 0 8 0 vnodes 208 1742 0 0 92 0 92 92 0 8 0 namei 1024 5897 0 5897 1 0 1 1 0 8 1 percpumem 16 38 0 6 1 0 1 1 0 8 0 vmpool 560 4 0 4 1 0 1 1 0 8 1 scxspl 192 6160 0 6160 8 3 5 7 0 8 5 plimitpl 152 27 0 19 1 0 1 1 0 8 0 sigapl 432 366 0 350 3 1 2 3 0 8 0 futexpl 56 2762 0 2761 1 0 1 1 0 8 0 knotepl 112 59 0 40 1 0 1 1 0 8 0 kqueuepl 104 16 0 14 1 0 1 1 0 8 0 pipelkpl 48 116 0 106 1 0 1 1 0 8 0 pipepl 120 232 0 213 2 1 1 2 0 8 0 fdescpl 496 367 0 350 3 0 3 3 0 8 0 filepl 152 2428 0 2321 7 1 6 7 0 8 1 lockfpl 104 65 0 64 1 0 1 1 0 8 0 lockfspl 48 22 0 21 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 96 269 0 259 1 0 1 1 0 8 0 zombiepl 144 350 0 350 1 0 1 1 0 8 1 processpl 960 383 0 350 5 0 5 5 0 8 0 procpl 624 717 0 672 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 400 439 0 413 5 0 5 5 0 8 2 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 165 0 0 20 0 20 20 0 8 0 mtagpl 80 14 0 0 1 0 1 1 0 8 0 mbufpl 256 208 0 0 13 0 13 13 0 8 0 bufpl 280 4385 0 193 300 0 300 300 0 8 0 anonpl 16 47989 0 31173 69 1 68 68 0 125 0 amapchunkpl 152 2980 0 2844 20 0 20 20 0 158 13 amappl16 192 1537 0 609 47 0 47 47 0 8 0 amappl15 184 130 0 125 1 0 1 1 0 8 0 amappl14 176 30 0 27 1 0 1 1 0 8 0 amappl13 168 62 0 60 1 0 1 1 0 8 0 amappl12 160 7 0 5 2 1 1 1 0 8 0 amappl11 152 58 0 43 1 0 1 1 0 8 0 amappl10 144 13 0 8 1 0 1 1 0 8 0 amappl9 136 602 0 599 1 0 1 1 0 8 0 amappl8 128 125 0 103 1 0 1 1 0 8 0 amappl7 120 110 0 99 1 0 1 1 0 8 0 amappl6 112 56 0 51 1 0 1 1 0 8 0 amappl5 104 136 0 121 1 0 1 1 0 8 0 amappl4 96 631 0 596 2 1 1 2 0 8 0 amappl3 88 120 0 113 1 0 1 1 0 8 0 amappl2 80 2182 0 2095 3 1 2 3 0 8 0 amappl1 72 18218 0 17740 27 17 10 21 0 8 0 amappl 80 969 0 924 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 24 371 0 354 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 371 0 354 1 0 1 1 0 8 0 vmmpekpl 168 6832 0 6797 2 0 2 2 0 8 0 vmmpepl 168 52611 0 50383 123 10 113 116 0 357 16 vmsppl 368 370 0 354 2 0 2 2 0 8 0 pdppl 4096 749 0 708 6 0 6 6 0 8 0 pvpl 32 163228 0 142800 165 0 165 165 0 265 0 pmappl 232 370 0 354 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 175 0 3 5 0 5 5 0 8 0