panic: pool_do_get: art_heap4 free list modified: page 0xfffffd8050e47000; item addr 0xfffffd8050e47000; offset 0x0=0x0 != 0x5852b347ed71b04f Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *160838 54516 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8221a365) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82540ae0,a,ffff80001e45d4e8) at pool_do_get+0x42a sys/kern/subr_pool.c:746 pool_get(ffffffff82540ae0,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000a07a80,fffffd805e2c1ee0,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000a07a80,fffffd805e2c2b60,ffff800000025254,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(6,ffff800000025250,0,ffff8000009e85e0,1,fffffd8054c89a88) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001e45d808,1,ffff80001e45d8d8,6) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff800000a27400,240404,ffff800000a27440,6) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000a27400) at rt_ifa_addlocal+0x149 sys/net/route.c:1242 in6_update_ifa(ffff8000009e6800,ffff80001e45dcd0,0) at in6_update_ifa+0x13bb sys/netinet6/in6.c:723 in6_ioctl_change_ifaddr(8080691a,ffff80001e45dcd0,ffff8000009e6800) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd805d8ecd88,8080691a,ffff80001e45dcd0,ffff80001e447650) at ifioctl+0xe60 sys/net/if.c:2291 sys_ioctl(ffff80001e447650,ffff80001e45dde8,ffff80001e45de30) at sys_ioctl+0x5b9 end trace frame: 0xffff80001e45dea0, count: 0 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic pool_do_get: art_heap4 free list modified: page 0xfffffd8050e47000; item addr 0xfffffd8050e47000; offset 0x0=0x0 != 0x5852b347ed71b04f ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8221a365) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82540ae0,a,ffff80001e45d4e8) at pool_do_get+0x42a sys/kern/subr_pool.c:746 pool_get(ffffffff82540ae0,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000a07a80,fffffd805e2c1ee0,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000a07a80,fffffd805e2c2b60,ffff800000025254,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(6,ffff800000025250,0,ffff8000009e85e0,1,fffffd8054c89a88) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001e45d808,1,ffff80001e45d8d8,6) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff800000a27400,240404,ffff800000a27440,6) at rt_ifa_add+0x290 sys/net/route.c:1133 rt_ifa_addlocal(ffff800000a27400) at rt_ifa_addlocal+0x149 sys/net/route.c:1242 in6_update_ifa(ffff8000009e6800,ffff80001e45dcd0,0) at in6_update_ifa+0x13bb sys/netinet6/in6.c:723 in6_ioctl_change_ifaddr(8080691a,ffff80001e45dcd0,ffff8000009e6800) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd805d8ecd88,8080691a,ffff80001e45dcd0,ffff80001e447650) at ifioctl+0xe60 sys/net/if.c:2291 sys_ioctl(ffff80001e447650,ffff80001e45dde8,ffff80001e45de30) at sys_ioctl+0x5b9 syscall(ffff80001e45deb0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc89f57eb60, count: -16 ddb> show registers rdi 0xffffffff82063a77 db_enter+0x17 rsi 0x4a12 __ALIGN_SIZE+0x3a12 rbp 0xffff80001e45d350 rbx 0xffff80001e45d400 rdx 0x4a13 __ALIGN_SIZE+0x3a13 rcx 0xffff80001d413000 rax 0xffff80001d413000 r8 0xffff80001e45d310 r9 0x1 r10 0xffff8000009e75c0 r11 0x6ccaab48d1323b0d r12 0x3000000008 r13 0xffff80001e45d360 r14 0x100 r15 0x1 rip 0xffffffff82063a78 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e45d340 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=160838 stat=onproc flags process=0 proc=4000000 pri=72, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff80001e4469f8,0xffffffff8254da30 process=0xffff8000ffff6378 user=0xffff80001e458000, vmspace=0xfffffd8052fb7998 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 54516 396563 21578 0 2 0 syz-executor.0 *54516 160838 21578 0 7 0x4000000 syz-executor.0 93409 211539 0 0 3 0x14200 bored sosplice 20107 228836 76824 0 2 0x2 syz-executor.1 21578 359878 76824 0 3 0x82 nanosleep syz-executor.0 76824 287292 59015 0 3 0x82 thrsleep syz-fuzzer 76824 393689 59015 0 3 0x4000082 nanosleep syz-fuzzer 76824 334426 59015 0 3 0x4000082 thrsleep syz-fuzzer 76824 268397 59015 0 3 0x4000082 thrsleep syz-fuzzer 76824 33844 59015 0 3 0x4000082 thrsleep syz-fuzzer 76824 339564 59015 0 3 0x4000082 kqread syz-fuzzer 76824 158530 59015 0 3 0x4000082 thrsleep syz-fuzzer 59015 280695 50484 0 3 0x10008a pause ksh 50484 999 71194 0 3 0x92 select sshd 65576 96732 1 0 3 0x100083 ttyin getty 71194 327943 1 0 3 0x80 select sshd 11676 421106 72986 73 3 0x100090 kqread syslogd 72986 519615 1 0 3 0x100082 netio syslogd 25941 68987 1 77 3 0x100090 poll dhclient 47911 473622 1 0 3 0x80 poll dhclient 57760 30217 0 0 2 0x14200 zerothread 34731 7479 0 0 3 0x14200 aiodoned aiodoned 12915 184898 0 0 3 0x14200 syncer update 65557 98224 0 0 3 0x14200 cleaner cleaner 4641 295820 0 0 3 0x14200 reaper reaper 28173 410484 0 0 3 0x14200 pgdaemon pagedaemon 43775 429855 0 0 3 0x14200 bored crynlk 32160 407833 0 0 3 0x14200 bored crypto 41612 57382 0 0 3 0x40014200 acpi0 acpi0 66545 215125 0 0 3 0x14200 bored softnet 20211 400451 0 0 3 0x14200 bored systqmp 79159 356625 0 0 3 0x14200 bored systq 80727 207186 0 0 3 0x40014200 bored softclock 66400 241846 0 0 3 0x40014200 idle0 58435 139567 0 0 3 0x14200 bored smr 1 449104 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9530 6371K 7338K 78643K 11317 0 pcb 13 8K 8K 78643K 81 0 rtable 102 4K 4K 78643K 301 0 ifaddr 102 19K 20K 78643K 154 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 41 0 iov 0 0K 24K 78643K 84 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1468 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 152 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 345 0 sigio 0 0K 0K 78643K 14 0 proc 48 38K 63K 78643K 416 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 27 0 in_multi 98 4K 4K 78643K 141 0 ether_multi 1 0K 0K 78643K 7 0 mrt 0 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 90 397K 397K 78643K 90 0 exec 0 0K 1K 78643K 215 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 128 55K 55K 78643K 1768 0 UVM aobj 40 2K 2K 78643K 40 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 80 0 NDP 15 0K 0K 78643K 25 0 temp 145 3027K 3101K 78643K 20035 0 kqueue 0 0K 0K 78643K 2 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 2 1 0 1 1 0 8 0 rtpcb 80 61 0 59 1 0 1 1 0 8 0 rtentry 112 55 0 17 2 0 2 2 0 8 0 unpcb 120 241 0 233 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 544 249 0 245 4 1 3 3 0 8 2 ipq 40 5 0 5 2 1 1 1 0 8 1 ipqe 40 225 0 225 2 1 1 1 0 8 1 inpcb 280 570 0 562 5 1 4 4 0 8 3 nd6 48 6 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 ppxss 1128 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 288 0 82 16 1 15 15 0 8 0 art_heap4: pool(0xffffffff82540ae0:art_heap4): free list modified: page 0xfffffd8050e47000; item ordinal 0; addr 0xfffffd8050e47000 (p 0xfffffd8062b9f000); offset 0x0=0x0 pool(art_heap4): free list modified: page 0xfffffd8050e47000; item ordinal 0; addr 0xfffffd8050e47000 (p 0xfffffd8062b9f000); offset 0x0=0x0 art_heap4: pool(0xffffffff82540ae0:art_heap4): page inconsistency: page 0xfffffd8050e47000; item ordinal 1; addr 0xfd1fc5c07e7cbd3a art_table 32 292 0 82 2 0 2 2 0 8 0 art_node 16 54 0 18 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 16 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 150 0 140 1 0 1 1 0 8 0 shmpl 112 38 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1936 0 540 46 0 46 46 0 8 0 ffsino 240 1936 0 540 83 0 83 83 0 8 0 nchpl 144 2652 0 1035 62 1 61 61 0 8 0 uvmvnodes 72 2143 0 0 39 0 39 39 0 8 0 vnodes 208 2143 0 0 113 0 113 113 0 8 0 namei 1024 7874 0 7874 1 0 1 1 0 8 1 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 528 6 0 0 1 0 1 1 0 8 0 scxspl 192 7829 0 7829 1 0 1 1 0 8 1 plimitpl 152 39 0 32 1 0 1 1 0 8 0 sigapl 432 516 0 503 2 0 2 2 0 8 0 futexpl 56 11114 0 11114 1 0 1 1 0 8 1 knotepl 112 141 0 122 1 0 1 1 0 8 0 kqueuepl 104 221 0 219 1 0 1 1 0 8 0 pipepl 128 392 0 373 3 1 2 2 0 8 1 fdescpl 424 517 0 503 2 0 2 2 0 8 0 filepl 120 4225 0 4129 6 1 5 5 0 8 2 lockfpl 104 129 0 128 1 0 1 1 0 8 0 lockfspl 48 49 0 48 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 443 0 436 1 0 1 1 0 8 0 zombiepl 144 505 0 505 1 0 1 1 0 8 1 processpl 872 534 0 505 4 0 4 4 0 8 0 procpl 632 1043 0 1007 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 384 884 0 866 8 1 7 7 0 8 5 mcl64k 65536 59 0 59 1 0 1 1 0 8 1 mcl16k 16384 6 0 6 3 2 1 1 0 8 1 mcl12k 12288 9 0 9 1 0 1 1 0 8 1 mcl9k 9216 11 0 11 1 0 1 1 0 8 1 mcl8k 8192 18 0 18 2 1 1 1 0 8 1 mcl4k 4096 47 0 47 1 0 1 1 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 69249 0 69208 17 11 6 14 0 8 0 mtagpl 80 29 0 6 2 1 1 1 0 8 0 mbufpl 256 112844 0 112715 39 16 23 23 0 8 11 bufpl 280 7347 0 1328 430 0 430 430 0 8 0 anonpl 16 84722 0 64631 97 10 87 96 0 107 3 amapchunkpl 152 2935 0 2755 17 8 9 17 0 158 0 amappl16 192 4034 0 2948 62 4 58 62 0 8 3 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 28 0 23 1 0 1 1 0 8 0 amappl13 168 2 0 2 2 2 0 1 0 8 0 amappl12 160 12 0 9 2 1 1 1 0 8 0 amappl11 152 45 0 34 1 0 1 1 0 8 0 amappl10 144 181 0 176 1 0 1 1 0 8 0 amappl9 136 564 0 561 1 0 1 1 0 8 0 amappl8 128 125 0 96 1 0 1 1 0 8 0 amappl7 120 255 0 245 1 0 1 1 0 8 0 amappl6 112 61 0 55 1 0 1 1 0 8 0 amappl5 104 134 0 122 1 0 1 1 0 8 0 amappl4 96 732 0 703 1 0 1 1 0 8 0 amappl3 88 129 0 121 1 0 1 1 0 8 0 amappl2 80 3379 0 3309 3 1 2 3 0 8 0 amappl1 72 19123 0 18692 26 16 10 20 0 8 0 amappl 80 1267 0 1221 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 39 0 0 1 0 1 1 0 8 0 uaddrrnd 24 523 0 503 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 523 0 503 1 0 1 1 0 8 0 vmmpekpl 168 7702 0 7675 2 0 2 2 0 8 0 vmmpepl 168 70286 0 68074 144 39 105 136 0 357 7 vmsppl 272 522 0 503 2 0 2 2 0 8 0 pdppl 4096 1052 0 1012 7 1 6 6 0 8 0 pvpl 32 243970 0 221382 217 9 208 217 0 265 23 pmappl 200 522 0 503 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 184 0 35 6 1 5 5 0 8 0