panic: free: non-malloced addr 0xffff800020ab0c70 type in_multi Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *399355 42953 0 0 0x4000000 1K syz-executor.0 363788 30803 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 free(ffff800020ab0c70,36,18) at free+0x50c in6_purgeaddr(ffff800000a93f00) at in6_purgeaddr+0x1b7 sys/netinet6/in6.c:912 in6_ifdetach(ffff800000a68000) at in6_ifdetach+0x74 sys/netinet6/in6_ifattach.c:422 if_setrdomain(ffff800000a68000,18) at if_setrdomain+0x1a2 sys/net/if.c:1829 ifioctl(fffffd806f6d5600,8020699f,ffff800023b8f350,ffff800020ab1160) at ifioctl+0x1303 sys/net/if.c:2087 sys_ioctl(ffff800020ab1160,ffff800023b8f468,ffff800023b8f4b0) at sys_ioctl+0x5b9 syscall(ffff800023b8f530) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b8f530) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,751a3982010) at Xsyscall+0x128 end of kernel end trace frame: 0x753ff8858c0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic free: non-malloced addr 0xffff800020ab0c70 type in_multi 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 free(ffff800020ab0c70,36,18) at free+0x50c in6_purgeaddr(ffff800000a93f00) at in6_purgeaddr+0x1b7 sys/netinet6/in6.c:912 in6_ifdetach(ffff800000a68000) at in6_ifdetach+0x74 sys/netinet6/in6_ifattach.c:422 if_setrdomain(ffff800000a68000,18) at if_setrdomain+0x1a2 sys/net/if.c:1829 ifioctl(fffffd806f6d5600,8020699f,ffff800023b8f350,ffff800020ab1160) at ifioctl+0x1303 sys/net/if.c:2087 sys_ioctl(ffff800020ab1160,ffff800023b8f468,ffff800023b8f4b0) at sys_ioctl+0x5b9 syscall(ffff800023b8f530) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b8f530) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,751a3982010) at Xsyscall+0x128 end of kernel end trace frame: 0x753ff8858c0, count: -10 ddb{1}> show registers rdi 0xffffffff81194cb7 db_enter+0x17 rsi 0x3f456 acpi_pdirpa+0x2b2be rbp 0xffff800023b8efd0 rbx 0xffff800023b8f080 rdx 0x3f457 acpi_pdirpa+0x2b2bf rcx 0xffff800023db0000 rax 0xffff800023db0000 r8 0xffffffff81f734ef kprintf+0x16f r9 0x1 r10 0x25 r11 0x837f1aa167bfc0e3 r12 0x3000000008 r13 0xffff800023b8efe0 r14 0x100 r15 0x1 rip 0xffffffff81194cb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023b8efc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=399355 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0c70,0xffffffff82645b50 process=0xffff800020add500 user=0xffff800023b8a000, vmspace=0xfffffd807f00a8a0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42953 515750 65197 0 2 0 syz-executor.0 *42953 399355 65197 0 7 0x4000000 syz-executor.0 65197 388153 30134 0 3 0x82 nanosleep syz-executor.0 7778 53244 30134 0 3 0x82 nanosleep syz-executor.1 45944 434043 0 0 3 0x14200 bored sosplice 30134 377367 96416 0 3 0x82 thrsleep syz-fuzzer 30134 294965 96416 0 3 0x4000082 nanosleep syz-fuzzer 30134 467171 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 359958 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 53654 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 167673 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 25897 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 441718 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 398068 96416 0 3 0x4000082 thrsleep syz-fuzzer 30134 187498 96416 0 3 0x4000082 kqread syz-fuzzer 30134 161562 96416 0 3 0x4000082 thrsleep syz-fuzzer 96416 293924 12696 0 3 0x10008a pause ksh 12696 473638 8692 0 3 0x92 select sshd 80496 149093 1 0 3 0x100083 ttyin getty 8692 127887 1 0 3 0x80 select sshd 62679 103264 7940 74 3 0x100092 bpf pflogd 7940 257590 1 0 3 0x80 netio pflogd 8769 431536 31574 73 3 0x100090 kqread syslogd 31574 494525 1 0 3 0x100082 netio syslogd 97723 241007 1 77 2 0x100090 dhclient 91805 75816 1 0 3 0x80 poll dhclient 19773 218356 0 0 2 0x14200 zerothread 95068 18674 0 0 3 0x14200 aiodoned aiodoned 1324 435435 0 0 3 0x14200 syncer update 72727 31253 0 0 3 0x14200 cleaner cleaner 30803 363788 0 0 7 0x14200 reaper 25044 236991 0 0 3 0x14200 pgdaemon pagedaemon 7761 488506 0 0 3 0x14200 bored crynlk 23597 466258 0 0 3 0x14200 bored crypto 17413 348201 0 0 3 0x40014200 acpi0 acpi0 62113 117604 0 0 3 0x40014200 idle1 69891 156133 0 0 3 0x14200 bored softnet 18748 295386 0 0 2 0x14200 systqmp 55709 124396 0 0 3 0x14200 bored systq 2883 501948 0 0 3 0x40014200 bored softclock 65881 194712 0 0 3 0x40014200 idle0 84137 404979 0 0 3 0x14200 bored smr 1 404486 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 42953 (syz-executor.0) thread 0xffff800020ab1160 (399355) exclusive rwlock netlock r = 0 (0xffffffff824f3758) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 ifioctl+0x12f6 sys/net/if.c:2087 #2 sys_ioctl+0x5b9 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8262a6d0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9605 6578K 7053K 78643K 12882 0 0 pcb 13 8K 8K 78643K 216 0 0 rtable 101 6K 6K 78643K 784 0 0 ifaddr 86 16K 17K 78643K 228 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1505 0 0 iov 0 0K 16K 78643K 203 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 77K 78643K 2237 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 8 0 0 VM map 13 6K 6K 78643K 13 0 0 sem 12 0K 0K 78643K 197 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 907 0 0 sigio 0 0K 0K 78643K 7 0 0 proc 60 63K 83K 78643K 812 0 0 subproc 32 2K 2K 78643K 153 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 95 0 0 in_multi 25 1K 2K 78643K 134 0 0 ether_multi 1 0K 0K 78643K 15 0 0 mrt 0 0K 0K 78643K 9 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 54 238K 238K 78643K 54 0 0 exec 0 0K 1K 78643K 377 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 146 118K 118K 78643K 4093 0 0 UVM aobj 71 3K 3K 78643K 78 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 205 0 0 NDP 21 0K 0K 78643K 66 0 0 temp 238 3565K 3633K 78643K 23233 0 0 kqueue 0 0K 0K 78643K 219 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 31 0 26 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 119 0 117 1 0 1 1 0 8 0 rtentry 112 148 0 112 2 0 2 2 0 8 0 unpcb 120 449 0 439 1 0 1 1 0 8 0 syncache 264 11 0 11 4 4 0 1 0 8 0 tcpqe 32 141 0 141 2 2 0 1 0 8 0 tcpcb 544 367 0 363 2 1 1 2 0 8 0 inpcb 280 1084 0 1075 5 3 2 2 0 8 1 rttmr 72 5 0 5 2 1 1 1 0 8 1 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 30 0 27 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 ppxss 1128 19 0 19 2 1 1 1 0 8 1 pffrag 232 29 0 29 2 1 1 1 0 482 1 pffrnode 88 29 0 29 2 1 1 1 0 8 1 pffrent 40 1042 0 1042 2 1 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 74 0 21 1 0 1 1 0 8 0 pfstkey 112 74 0 21 2 0 2 2 0 8 0 pfstate 328 74 0 21 5 0 5 5 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 10 0 8 3 1 2 3 0 8 0 art_heap4 256 942 0 617 26 5 21 24 0 8 0 art_table 32 952 0 625 4 0 4 4 0 8 0 art_node 16 147 0 106 1 0 1 1 0 8 0 sysvmsgpl 40 56 0 34 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 195 0 185 1 0 1 1 0 8 0 shmpl 112 76 0 7 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2702 0 1286 46 0 46 46 0 8 0 ffsino 272 2702 0 1286 95 0 95 95 0 8 0 nchpl 144 4587 0 2982 61 0 61 61 0 8 0 uvmvnodes 72 3572 0 0 65 0 65 65 0 8 0 vnodes 208 3572 0 0 188 0 188 188 0 8 0 namei 1024 14694 0 14694 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 11 0 0 2 0 2 2 0 8 0 vmpool 552 11 0 0 1 0 1 1 0 8 0 scxspl 192 12331 0 12331 13 12 1 7 0 8 1 plimitpl 152 84 0 76 1 0 1 1 0 8 0 sigapl 432 1084 0 1069 3 1 2 3 0 8 0 futexpl 56 19220 0 19220 1 0 1 1 0 8 1 knotepl 112 709 0 690 2 1 1 2 0 8 0 kqueuepl 104 587 0 585 1 0 1 1 0 8 0 pipepl 112 650 0 631 3 2 1 2 0 8 0 fdescpl 488 1085 0 1069 3 0 3 3 0 8 0 filepl 152 9186 0 9084 9 4 5 6 0 8 1 lockfpl 104 307 0 306 1 0 1 1 0 8 0 lockfspl 48 108 0 107 1 0 1 1 0 8 0 sessionpl 112 25 0 14 1 0 1 1 0 8 0 pgrppl 48 41 0 30 1 0 1 1 0 8 0 ucredpl 96 906 0 897 1 0 1 1 0 8 0 zombiepl 144 1069 0 1068 1 0 1 1 0 8 0 processpl 896 1101 0 1068 4 0 4 4 0 8 0 procpl 632 2952 0 2908 5 0 5 5 0 8 1 srpgc 64 16 0 16 4 4 0 1 0 8 0 sosppl 128 14 0 14 3 2 1 1 0 8 1 sockpl 384 1661 0 1640 6 3 3 4 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 175 0 0 21 0 21 21 0 8 0 mtagpl 80 17 0 0 1 0 1 1 0 8 0 mbufpl 256 329 0 0 19 0 19 19 0 8 0 bufpl 256 8500 0 1442 442 0 442 442 0 8 0 anonpl 16 148747 0 128505 125 27 98 98 0 124 15 amapchunkpl 152 7162 0 7007 18 8 10 11 0 158 3 amappl16 192 5518 0 4352 96 30 66 70 0 8 7 amappl15 184 133 0 133 1 1 0 1 0 8 0 amappl14 176 277 0 270 1 0 1 1 0 8 0 amappl13 168 321 0 318 1 0 1 1 0 8 0 amappl12 160 77 0 75 1 0 1 1 0 8 0 amappl11 152 151 0 136 1 0 1 1 0 8 0 amappl10 144 82 0 78 1 0 1 1 0 8 0 amappl9 136 695 0 691 1 0 1 1 0 8 0 amappl8 128 276 0 235 3 1 2 2 0 8 0 amappl7 120 128 0 121 1 0 1 1 0 8 0 amappl6 112 142 0 130 1 0 1 1 0 8 0 amappl5 104 256 0 242 1 0 1 1 0 8 0 amappl4 96 1330 0 1293 1 0 1 1 0 8 0 amappl3 88 370 0 362 1 0 1 1 0 8 0 amappl2 80 7775 0 7693 3 1 2 3 0 8 0 amappl1 72 34057 0 33601 27 17 10 21 0 8 0 amappl 80 3339 0 3284 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 77 0 7 2 0 2 2 0 8 0 uaddrrnd 24 1096 0 1069 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1096 0 1069 1 0 1 1 0 8 0 vmmpekpl 168 12669 0 12630 2 0 2 2 0 8 0 vmmpepl 168 145625 0 143194 174 30 144 148 0 357 37 vmsppl 368 1084 0 1068 2 0 2 2 0 8 0 pdppl 4096 2199 0 2147 7 0 7 7 0 8 0 pvpl 32 401024 0 377900 268 44 224 226 0 265 33 pmappl 232 1095 0 1068 3 1 2 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 635 0 10 18 0 18 18 0 8 0