panic: pool_do_get: art_heap4 free list modified: page 0xfffffd8005d55000; item addr 0xfffffd8005d55000; offset 0x0=0x0 != 0x90f7b9993e47d25b Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *119555 87562 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822521a9) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8257f250,a,ffff80001d81f8c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8257f250,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000063a40,fffffd8057dfc128,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000063a40,fffffd80687d2b60,ffff800000064264,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(0,ffff800000064260,0,ffff8000006b5258,1,fffffd8057df58c8) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001d81fbe8,1,ffff80001d81fcb0,0) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff8000006b5200,440004,ffff8000006b5268,0) at rt_ifa_add+0x25c sys/net/route.c:1131 in_ifinit(ffff800000a01800,ffff8000006b5200,ffff80001d81ff90,0) at in_ifinit+0x3cc in_ioctl_set_ifaddr(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl_set_ifaddr+0x264 sys/netinet/in.c:399 in_ioctl(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl+0x2d8 sys/netinet/in.c:243 ifioctl(fffffd8057ecab00,8020690c,ffff80001d81ff80,ffff80001d75d770) at ifioctl+0xe60 sys/net/if.c:2289 sys_ioctl(ffff80001d75d770,ffff80001d820098,ffff80001d8200e0) at sys_ioctl+0x4a1 end trace frame: 0xffff80001d820150, 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 0xfffffd8005d55000; item addr 0xfffffd8005d55000; offset 0x0=0x0 != 0x90f7b9993e47d25b ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822521a9) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8257f250,a,ffff80001d81f8c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8257f250,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000063a40,fffffd8057dfc128,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000063a40,fffffd80687d2b60,ffff800000064264,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(0,ffff800000064260,0,ffff8000006b5258,1,fffffd8057df58c8) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001d81fbe8,1,ffff80001d81fcb0,0) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff8000006b5200,440004,ffff8000006b5268,0) at rt_ifa_add+0x25c sys/net/route.c:1131 in_ifinit(ffff800000a01800,ffff8000006b5200,ffff80001d81ff90,0) at in_ifinit+0x3cc in_ioctl_set_ifaddr(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl_set_ifaddr+0x264 sys/netinet/in.c:399 in_ioctl(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl+0x2d8 sys/netinet/in.c:243 ifioctl(fffffd8057ecab00,8020690c,ffff80001d81ff80,ffff80001d75d770) at ifioctl+0xe60 sys/net/if.c:2289 sys_ioctl(ffff80001d75d770,ffff80001d820098,ffff80001d8200e0) at sys_ioctl+0x4a1 syscall(ffff80001d820160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xef6b61758c0, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d81f730 rbx 0xffff80001d81f7e0 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff8214f22f kprintf+0x15f r9 0x1 r10 0x2 r11 0x8fc1fe57a2d55c45 r12 0x3000000008 r13 0xffff80001d81f740 r14 0x100 r15 0x1 rip 0xffffffff8110bea8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d81f720 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=119555 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=67, nice=20 forw=0xffffffffffffffff, list=0xffff80001d75eaf0,0xffffffff8257f930 process=0xffff8000ffff95a8 user=0xffff80001d81b000, vmspace=0xfffffd8057dea118 estcpu=34, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 87562 365249 45363 0 2 0 syz-executor.0 *87562 119555 45363 0 7 0x4000000 syz-executor.0 16123 230522 95688 0 3 0x80 nanosleep syz-executor.1 16123 86137 95688 0 3 0x4000080 netcon syz-executor.1 16123 207431 95688 0 3 0x4000080 fsleep syz-executor.1 43053 512215 0 0 3 0x14200 bored sosplice 45363 71362 77312 0 3 0x82 nanosleep syz-executor.0 95688 348361 77312 0 3 0x82 nanosleep syz-executor.1 77312 305802 83933 0 3 0x82 thrsleep syz-fuzzer 77312 212350 83933 0 3 0x4000082 thrsleep syz-fuzzer 77312 43814 83933 0 3 0x4000082 thrsleep syz-fuzzer 77312 101342 83933 0 3 0x4000082 thrsleep syz-fuzzer 77312 200009 83933 0 3 0x4000082 thrsleep syz-fuzzer 77312 349308 83933 0 3 0x4000082 kqread syz-fuzzer 77312 316807 83933 0 3 0x4000082 thrsleep syz-fuzzer 77312 508253 83933 0 3 0x4000082 thrsleep syz-fuzzer 83933 267738 79941 0 3 0x10008a pause ksh 79941 374437 5946 0 3 0x92 select sshd 19087 317676 1 0 3 0x100083 ttyin getty 5946 53679 1 0 3 0x80 select sshd 90181 172868 7655 73 3 0x100090 kqread syslogd 7655 156816 1 0 3 0x100082 netio syslogd 9367 143195 1 77 2 0x100090 dhclient 25339 55233 1 0 3 0x80 poll dhclient 71675 504672 0 0 3 0x14200 bored smr 95778 93202 0 0 2 0x14200 zerothread 14431 324363 0 0 3 0x14200 aiodoned aiodoned 52614 102806 0 0 3 0x14200 syncer update 50405 120879 0 0 3 0x14200 cleaner cleaner 60806 460643 0 0 3 0x14200 reaper reaper 6456 68873 0 0 3 0x14200 pgdaemon pagedaemon 75492 462159 0 0 3 0x14200 bored crynlk 70211 144220 0 0 3 0x14200 bored crypto 92326 136748 0 0 3 0x40014200 acpi0 acpi0 74897 199950 0 0 3 0x14200 bored softnet 7390 342101 0 0 2 0x14200 systqmp 14184 477638 0 0 3 0x14200 bored systq 61213 226148 0 0 3 0x40014200 bored softclock 87741 384905 0 0 3 0x40014200 idle0 1 291755 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 9482 6335K 6595K 78643K 10802 0 pcb 13 8K 8K 78643K 59 0 rtable 103 3K 4K 78643K 275 0 ifaddr 61 13K 13K 78643K 98 0 counters 21 16K 16K 78643K 27 0 ioctlops 0 0K 2K 78643K 37 0 iov 0 0K 12K 78643K 22 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1318 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 5K 78643K 7 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 24 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 6 17K 25K 78643K 199 0 sigio 0 0K 0K 78643K 3 0 proc 49 38K 54K 78643K 368 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 21 0 in_multi 49 2K 2K 78643K 77 0 ether_multi 1 0K 0K 78643K 9 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 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 199 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 130 104K 104K 78643K 1416 0 UVM aobj 9 2K 3K 78643K 15 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 9 0K 0K 78643K 20 0 temp 91 3031K 3095K 78643K 2205 0 kqueue 3 4K 12K 78643K 21 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 1 1 0 1 1 0 8 0 rtpcb 80 37 0 35 1 0 1 1 0 8 0 rtentry 112 53 0 13 2 0 2 2 0 8 0 unpcb 120 136 0 127 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 0 1 1 0 8 1 tcpqe 32 727 0 727 1 1 0 1 0 8 0 tcpcb 544 211 0 204 1 0 1 1 0 8 0 ipq 40 2 0 2 1 0 1 1 0 8 1 ipqe 40 4 0 4 1 0 1 1 0 8 1 inpcb 280 381 0 369 3 1 2 2 0 8 0 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 7 0 3 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 215 0 40 13 0 13 13 0 8 0 art_heap4: pool(0xffffffff8257f250:art_heap4): free list modified: page 0xfffffd8005d55000; item ordinal 0; addr 0xfffffd8005d55000 (p 0xfffffd8068a07000); offset 0x0=0x0 pool(art_heap4): free list modified: page 0xfffffd8005d55000; item ordinal 0; addr 0xfffffd8005d55000 (p 0xfffffd8068a07000); offset 0x0=0x0 art_heap4: pool(0xffffffff8257f250:art_heap4): page inconsistency: page 0xfffffd8005d55000; item ordinal 1; addr 0x2e4fab1fe8530871 art_table 32 217 0 40 2 0 2 2 0 8 0 art_node 16 52 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 15 2 1 1 1 0 8 0 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 13 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1686 0 287 88 0 88 88 0 8 0 ffsino 240 1686 0 287 83 0 83 83 0 8 0 nchpl 144 2135 0 532 60 0 60 60 0 8 0 uvmvnodes 72 1776 0 0 33 0 33 33 0 8 0 vnodes 208 1776 0 0 94 0 94 94 0 8 0 namei 1024 5414 0 5414 2 1 1 1 0 8 1 vcpupl 1984 10 0 0 2 0 2 2 0 8 0 vmpool 528 10 0 0 1 0 1 1 0 8 0 scxspl 192 6761 0 6761 1 0 1 1 0 8 1 plimitpl 152 29 0 22 1 0 1 1 0 8 0 sigapl 424 386 0 356 4 0 4 4 0 8 0 futexpl 56 4017 0 4016 2 1 1 1 0 8 0 knotepl 112 88 0 69 1 0 1 1 0 8 0 kqueuepl 144 126 0 122 1 0 1 1 0 8 0 pipelkpl 16 92 0 82 1 0 1 1 0 8 0 pipepl 120 184 0 165 1 0 1 1 0 8 0 fdescpl 432 371 0 356 2 0 2 2 0 8 0 filepl 120 2296 0 2193 4 0 4 4 0 8 0 lockfpl 104 34 0 33 1 0 1 1 0 8 0 lockfspl 48 15 0 14 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 36 0 26 1 0 1 1 0 8 0 ucredpl 96 208 0 201 1 0 1 1 0 8 0 zombiepl 144 356 0 356 1 0 1 1 0 8 1 processpl 920 386 0 356 4 0 4 4 0 8 0 procpl 624 681 0 641 5 1 4 4 0 8 0 sosppl 128 5 0 5 2 1 1 1 0 8 1 sockpl 400 559 0 536 3 0 3 3 0 8 0 mcl64k 65536 11 0 11 3 2 1 1 0 8 1 mcl16k 16384 2 0 2 2 1 1 1 0 8 1 mcl12k 12288 5 0 5 3 3 0 1 0 8 0 mcl9k 9216 3 0 3 2 1 1 1 0 8 1 mcl8k 8192 3 0 3 3 2 1 1 0 8 1 mcl4k 4096 23 0 23 3 2 1 1 0 8 1 mcl2k 2048 64575 0 64511 25 16 9 20 0 8 0 mtagpl 80 19 0 2 2 1 1 1 0 8 0 mbufpl 256 104111 0 103928 18 6 12 13 0 8 0 bufpl 280 3532 0 133 243 0 243 243 0 8 0 anonpl 16 61509 0 47172 76 1 75 75 0 107 17 amapchunkpl 152 1957 0 1811 12 2 10 10 0 158 4 amappl16 192 2118 0 1355 54 8 46 50 0 8 7 amappl15 184 95 0 91 1 0 1 1 0 8 0 amappl14 176 26 0 20 1 0 1 1 0 8 0 amappl13 168 25 0 24 1 0 1 1 0 8 0 amappl12 160 115 0 107 2 1 1 1 0 8 0 amappl11 152 116 0 105 1 0 1 1 0 8 0 amappl10 144 17 0 11 1 0 1 1 0 8 0 amappl9 136 369 0 368 1 0 1 1 0 8 0 amappl8 128 316 0 278 2 0 2 2 0 8 0 amappl7 120 107 0 95 1 0 1 1 0 8 0 amappl6 112 95 0 91 1 0 1 1 0 8 0 amappl5 104 313 0 301 1 0 1 1 0 8 0 amappl4 96 427 0 397 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 2229 0 2154 2 0 2 2 0 8 0 amappl1 72 16311 0 15882 24 15 9 17 0 8 0 amappl 80 924 0 874 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 14 0 6 1 0 1 1 0 8 0 uaddrrnd 24 381 0 356 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 381 0 356 1 0 1 1 0 8 0 vmmpekpl 168 6645 0 6617 2 0 2 2 0 8 0 vmmpepl 168 53984 0 51996 115 20 95 98 0 357 8 vmsppl 272 380 0 356 2 0 2 2 0 8 0 pdppl 4096 768 0 722 7 1 6 6 0 8 0 pvpl 32 196512 0 179489 187 2 185 185 0 265 47 pmappl 200 380 0 356 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 264 0 34 7 0 7 7 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822521a9) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8257f250,a,ffff80001d81f8c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8257f250,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000063a40,fffffd8057dfc128,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000063a40,fffffd80687d2b60,ffff800000064264,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(0,ffff800000064260,0,ffff8000006b5258,1,fffffd8057df58c8) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001d81fbe8,1,ffff80001d81fcb0,0) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff8000006b5200,440004,ffff8000006b5268,0) at rt_ifa_add+0x25c sys/net/route.c:1131 in_ifinit(ffff800000a01800,ffff8000006b5200,ffff80001d81ff90,0) at in_ifinit+0x3cc in_ioctl_set_ifaddr(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl_set_ifaddr+0x264 sys/netinet/in.c:399 in_ioctl(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl+0x2d8 sys/netinet/in.c:243 ifioctl(fffffd8057ecab00,8020690c,ffff80001d81ff80,ffff80001d75d770) at ifioctl+0xe60 sys/net/if.c:2289 sys_ioctl(ffff80001d75d770,ffff80001d820098,ffff80001d8200e0) at sys_ioctl+0x4a1 syscall(ffff80001d820160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xef6b61758c0, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822521a9) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8257f250,a,ffff80001d81f8c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8257f250,a) at pool_get+0xb5 sys/kern/subr_pool.c:581 art_table_get(ffff800000063a40,fffffd8057dfc128,10) at art_table_get+0x12e sys/net/art.c:722 art_insert(ffff800000063a40,fffffd80687d2b60,ffff800000064264,20) at art_insert+0x155 sys/net/art.c:387 rtable_insert(0,ffff800000064260,0,ffff8000006b5258,1,fffffd8057df58c8) at rtable_insert+0x2b4 sys/net/rtable.c:554 rtrequest(1,ffff80001d81fbe8,1,ffff80001d81fcb0,0) at rtrequest+0x8be sys/net/route.c:941 rt_ifa_add(ffff8000006b5200,440004,ffff8000006b5268,0) at rt_ifa_add+0x25c sys/net/route.c:1131 in_ifinit(ffff800000a01800,ffff8000006b5200,ffff80001d81ff90,0) at in_ifinit+0x3cc in_ioctl_set_ifaddr(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl_set_ifaddr+0x264 sys/netinet/in.c:399 in_ioctl(8020690c,ffff80001d81ff80,ffff800000a01800,1) at in_ioctl+0x2d8 sys/netinet/in.c:243 ifioctl(fffffd8057ecab00,8020690c,ffff80001d81ff80,ffff80001d75d770) at ifioctl+0xe60 sys/net/if.c:2289 sys_ioctl(ffff80001d75d770,ffff80001d820098,ffff80001d8200e0) at sys_ioctl+0x4a1 syscall(ffff80001d820160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xef6b61758c0, count: -16