panic: pool_do_get: inpcb free list modified: page 0xfffffd80626f2000; item addr 0xfffffd80626f2e98; offset 0x0=0x0 != 0xcbd1fba971b51cc3 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *131711 77275 0 0 0x4000000 0 syz-executor.4 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8261beb0) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff829c4028,9,ffff80002e9a3698) at pool_do_get+0x427 sys/kern/subr_pool.c:738 pool_get(ffffffff829c4028,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 in_pcballoc(fffffd8068a6ddc0,ffffffff829bd6e8,1) at in_pcballoc+0x59 sys/netinet/in_pcb.c:235 udp_attach(fffffd8068a6ddc0,0,1) at udp_attach+0xe4 sys/netinet/udp_usrreq.c:1091 socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b pru_attach sys/sys/protosw.h:272 [inline] socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b sys/kern/uipc_socket.c:197 sys_socket(ffff8000231d27e8,ffff80002e9a38c8,ffff80002e9a3910) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:98 syscall(ffff80002e9a3990) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc8c0602620, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: pool_do_get: inpcb free list modified: page 0xfffffd80626f2000; item addr 0xfffffd80626f2e98; offset 0x0=0x0 != 0xcbd1fba971b51cc3 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8261beb0) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff829c4028,9,ffff80002e9a3698) at pool_do_get+0x427 sys/kern/subr_pool.c:738 pool_get(ffffffff829c4028,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 in_pcballoc(fffffd8068a6ddc0,ffffffff829bd6e8,1) at in_pcballoc+0x59 sys/netinet/in_pcb.c:235 udp_attach(fffffd8068a6ddc0,0,1) at udp_attach+0xe4 sys/netinet/udp_usrreq.c:1091 socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b pru_attach sys/sys/protosw.h:272 [inline] socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b sys/kern/uipc_socket.c:197 sys_socket(ffff8000231d27e8,ffff80002e9a38c8,ffff80002e9a3910) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:98 syscall(ffff80002e9a3990) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc8c0602620, count: -10 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e9a3510 rbx 0xcbd1fba971b51cc3 rdx 0 rcx 0 rax 0xffff8000231d27e8 r8 0x101010101010101 r9 0x8080808080808080 r10 0xade8f56cd63b0f8d r11 0x95870711cd5b5590 r12 0 r13 0xfffffd80626f2e98 r14 0 r15 0x1 rip 0xffffffff814e1d98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e9a3500 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.4) pid=131711 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000231d2d28,0xffffffff829d0a90 process=0xffff8000217a2818 user=0xffff80002e99e000, vmspace=0xfffffd806b8b3de0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 84773 262141 19684 0 2 0 syz-executor.1 77275 405337 25598 0 2 0 syz-executor.4 77275 473928 25598 0 2 0x4000000 syz-executor.4 *77275 131711 25598 0 7 0x4000000 syz-executor.4 39350 182724 2393 0 2 0 syz-executor.0 39350 365335 2393 0 3 0x4000080 fsleep syz-executor.0 20455 182524 25289 0 2 0x2 syz-executor.2 55752 353835 0 0 3 0x14280 nfsidl nfsio 71295 43933 0 0 3 0x14280 nfsidl nfsio 85815 228556 0 0 3 0x14280 nfsidl nfsio 20015 509326 0 0 3 0x14280 nfsidl nfsio 70608 316215 0 0 3 0x14280 nfsidl nfsio 10148 362837 0 0 3 0x14280 nfsidl nfsio 55537 79669 0 0 3 0x14280 nfsidl nfsio 88583 63064 0 0 3 0x14280 nfsidl nfsio 20778 323784 0 0 3 0x14280 nfsidl nfsio 49095 449152 0 0 3 0x14280 nfsidl nfsio 451 429883 0 0 3 0x14280 nfsidl nfsio 29877 472722 0 0 3 0x14280 nfsidl nfsio 6154 61943 0 0 3 0x14280 nfsidl nfsio 76197 127242 0 0 3 0x14280 nfsidl nfsio 43983 520605 0 0 3 0x14280 nfsidl nfsio 2448 92947 0 0 3 0x14280 nfsidl nfsio 73312 52454 0 0 3 0x14280 nfsidl nfsio 17955 359494 0 0 3 0x14280 nfsidl nfsio 64106 149227 0 0 3 0x14280 nfsidl nfsio 38439 445979 0 0 3 0x14280 nfsidl nfsio 39275 337400 0 0 3 0x14200 bored sosplice 39570 178328 25289 0 2 0x2 syz-executor.7 70741 188780 25289 0 2 0x2 syz-executor.6 34098 163282 25289 0 2 0x2 syz-executor.5 25598 88488 25289 0 3 0x82 nanoslp syz-executor.4 77856 14682 25289 0 3 0x82 nanoslp syz-executor.3 2393 247990 25289 0 3 0x82 nanoslp syz-executor.0 19684 128900 25289 0 3 0x82 nanoslp syz-executor.1 25289 350212 95289 0 3 0x82 kqread syz-fuzzer 25289 205997 95289 0 3 0x4000082 nanoslp syz-fuzzer 25289 363458 95289 0 3 0x4000082 wait syz-fuzzer 25289 89753 95289 0 3 0x4000082 wait syz-fuzzer 25289 420815 95289 0 3 0x4000082 wait syz-fuzzer 25289 499823 95289 0 3 0x4000082 thrsleep syz-fuzzer 25289 174035 95289 0 3 0x4000082 thrsleep syz-fuzzer 25289 131111 95289 0 3 0x4000082 wait syz-fuzzer 25289 513011 95289 0 3 0x4000082 thrsleep syz-fuzzer 25289 355427 95289 0 3 0x4000082 wait syz-fuzzer 25289 369419 95289 0 3 0x4000082 wait syz-fuzzer 25289 480923 95289 0 3 0x4000082 wait syz-fuzzer 25289 68513 95289 0 3 0x4000082 wait syz-fuzzer 25289 384777 95289 0 3 0x4000082 thrsleep syz-fuzzer 95289 177183 64064 0 3 0x10008a sigsusp ksh 64064 71316 75975 0 3 0x9a kqread sshd 60769 393121 1 0 3 0x100083 ttyin getty 75975 15137 1 0 3 0x88 kqread sshd 9299 48320 21718 73 3 0x1100090 kqread syslogd 21718 380075 1 0 3 0x100082 netio syslogd 21995 407862 1 0 3 0x100080 kqread resolvd 88097 450064 98869 77 3 0x100092 kqread dhcpleased 67752 212585 98869 77 3 0x100092 kqread dhcpleased 98869 456592 1 0 3 0x80 kqread dhcpleased 58669 494746 0 0 3 0x14200 bored smr 41860 163893 0 0 2 0x14200 zerothread 13324 313247 0 0 3 0x14200 aiodoned aiodoned 47593 255250 0 0 3 0x14200 syncer update 75755 393126 0 0 3 0x14200 cleaner cleaner 20974 283677 0 0 3 0x14200 reaper reaper 99493 7966 0 0 3 0x14200 pgdaemon pagedaemon 49099 223596 0 0 3 0x14200 bored viomb 79605 54027 0 0 3 0x40014200 acpi0 acpi0 61575 40653 0 0 3 0x14200 bored softnet 63483 148689 0 0 3 0x14200 bored softnet 80459 73609 0 0 3 0x14200 bored softnet 18194 35372 0 0 3 0x14200 bored softnet 38725 313321 0 0 3 0x14200 bored systqmp 83484 189533 0 0 3 0x14200 bored systq 47435 334328 0 0 3 0x40014200 bored softclock 29942 435575 0 0 3 0x40014200 idle0 1 24044 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 10204 6405K 6923K 78643K 13135 0 pcb 13 14K 15K 78643K 418 0 rtable 161 6K 7K 78643K 719 0 ifaddr 83 17K 19K 78643K 243 0 sysctl 2 0K 0K 78643K 5 0 counters 27 17K 17K 78643K 64 0 ioctlops 0 0K 2K 78643K 176 0 iov 0 0K 20K 78643K 354 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1397 87K 88K 78643K 2344 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 20 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 244 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 73K 78643K 1576 0 sigio 0 0K 0K 78643K 53 0 proc 58 59K 83K 78643K 630 0 subproc 104 6K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 50 0 in_multi 63 4K 6K 78643K 188 0 ether_multi 1 0K 0K 78643K 11 0 mrt 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 205 917K 917K 78643K 205 0 exec 0 0K 1K 78643K 726 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 260 214K 235K 78643K 11377 0 UVM aobj 131 4K 4K 78643K 135 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 63 0 NDP 11 0K 1K 78643K 67 0 temp 124 4694K 4758K 78643K 23262 0 kqueue 12 18K 24K 78643K 132 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 rtpcb 120 116 0 113 1 0 1 1 0 8 0 rtentry 112 174 0 105 4 0 4 4 0 8 0 unpcb 144 2019 0 2006 15 11 4 6 0 8 3 syncache 296 9 0 9 3 3 0 1 0 8 0 tcpqe 32 93 0 93 2 2 0 1 0 8 0 tcpcb 776 1951 0 1913 31 24 7 14 0 8 3 arp 88 27 0 15 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 4 0 4 1 1 0 1 0 8 0 inpcb 336 3089 0 3041 26 19 7 12 0 8 3 inpcb: pool(0xffffffff829c4028:inpcb): free list modified: page 0xfffffd80626f2000; item ordinal 0; addr 0xfffffd80626f2e98 (p 0xfffffd8068c4b000); offset 0x0=0x0 pool(inpcb): free list modified: page 0xfffffd80626f2000; item ordinal 0; addr 0xfffffd80626f2e98 (p 0xfffffd8068c4b000); offset 0x0=0x0 inpcb: pool(0xffffffff829c4028:inpcb): page inconsistency: page 0xfffffd80626f2000; item ordinal 1; addr 0x739b6bb4b342fbed nd6 48 39 0 24 1 0 1 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 3 0 3 1 0 1 1 0 8 1 ppxss 1160 16 0 16 2 1 1 1 0 8 1 pppxif 1608 7 0 7 1 0 1 1 0 8 1 pfstscr 40 8 0 7 1 0 1 1 0 8 0 pfstitem 24 5 0 3 1 0 1 1 0 8 0 pfstkey 120 13 0 11 1 0 1 1 0 8 0 pfstate 352 8 0 7 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 727 0 448 32 6 26 30 0 8 4 art_table 32 728 0 448 4 0 4 4 0 8 0 art_node 16 170 0 111 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0 semapl 112 242 0 232 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3460 0 2035 90 0 90 90 0 8 0 ffsino 240 3460 0 2035 85 0 85 85 0 8 0 nchpl 144 5773 0 5287 63 41 22 63 0 8 0 uvmvnodes 80 4378 0 0 90 0 90 90 0 8 0 vnodes 216 4378 0 0 244 0 244 244 0 8 0 namei 1024 21743 0 21741 2 1 1 2 0 8 0 vcpupl 2048 10 0 1 2 0 2 2 0 8 0 vmpool 536 14 0 5 2 1 1 1 0 8 0 kstatmem 264 82 0 60 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 17728 0 17728 12 10 2 8 0 8 2 plimitpl 152 329 0 314 1 0 1 1 0 8 0 sigapl 424 1882 0 1820 8 0 8 8 0 8 0 futexpl 64 16105 0 16104 1 0 1 1 0 8 0 knotepl 120 34512 0 34432 13 9 4 7 0 8 0 kqueuepl 184 288 0 280 5 4 1 4 0 8 0 pipepl 288 472 0 444 13 10 3 7 0 8 0 fdescpl 432 1845 0 1821 4 0 4 4 0 8 0 filepl 120 15829 0 15555 27 15 12 15 0 8 3 lockfpl 104 986 0 984 5 3 2 2 0 8 1 lockfspl 48 287 0 285 1 0 1 1 0 8 0 sessionpl 144 27 0 11 1 0 1 1 0 8 0 pgrppl 48 27 0 11 1 0 1 1 0 8 0 ucredpl 104 1776 0 1765 1 0 1 1 0 8 0 zombiepl 144 1821 0 1820 1 0 1 1 0 8 0 processpl 1000 1882 0 1820 10 1 9 9 0 8 0 procpl 672 4156 0 4078 10 1 9 9 0 8 1 sosppl 168 4 0 4 2 1 1 1 0 8 1 sockpl 456 5225 0 5160 88 76 12 22 0 8 3 mcl64k 65536 45 0 45 2 1 1 1 0 8 1 mcl16k 16384 34 0 34 3 2 1 1 0 8 1 mcl12k 12288 46 0 46 3 2 1 1 0 8 1 mcl9k 9216 12 0 12 3 3 0 1 0 8 0 mcl8k 8192 84 0 84 4 3 1 1 0 8 1 mcl4k 4096 171 0 171 3 2 1 1 0 8 1 mcl2k2 2112 12 0 12 5 4 1 1 0 8 1 mcl2k 2048 76494 0 76419 31 20 11 30 0 8 0 mtagpl 96 283 0 32 8 1 7 7 0 8 0 mbufpl 256 142554 0 142126 148 119 29 119 0 8 0 bufpl 288 7001 0 597 458 0 458 458 0 8 0 anonpl 24 407216 0 391584 132 8 124 124 0 188 11 amapchunkpl 152 33455 0 32835 47 18 29 40 0 158 1 amappl16 200 5784 0 5201 56 17 39 45 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 166 0 154 2 1 1 2 0 8 0 amappl13 176 11 0 11 1 1 0 1 0 8 0 amappl12 168 450 0 444 1 0 1 1 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 37 0 25 1 0 1 1 0 8 0 amappl9 144 961 0 958 1 0 1 1 0 8 0 amappl8 136 182 0 125 3 0 3 3 0 8 0 amappl7 128 46 0 33 1 0 1 1 0 8 0 amappl6 120 319 0 302 2 1 1 2 0 8 0 amappl5 112 96 0 88 1 0 1 1 0 8 0 amappl4 104 535 0 513 1 0 1 1 0 8 0 amappl3 96 4728 0 4687 2 0 2 2 0 8 0 amappl2 88 2190 0 2127 3 1 2 3 0 8 0 amappl1 80 43345 0 42721 21 5 16 21 0 8 0 amappl 88 11016 0 10851 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 1859 0 1826 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1859 0 1826 1 0 1 1 0 8 0 vmmpekpl 168 18430 0 18378 3 0 3 3 0 8 0 vmmpepl 168 175217 0 172870 157 26 131 132 0 357 14 vmsppl 272 1858 0 1826 5 2 3 3 0 8 0 rwobjpl 24 52389 0 46282 38 0 38 38 0 8 0 pdppl 4096 3724 0 3661 159 86 73 74 0 8 10 pvpl 32 819806 0 799081 288 75 213 254 0 265 23 pmappl 216 1858 0 1826 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1071 0 273 25 0 25 25 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:437 panic(ffffffff8261beb0) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff829c4028,9,ffff80002e9a3698) at pool_do_get+0x427 sys/kern/subr_pool.c:738 pool_get(ffffffff829c4028,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 in_pcballoc(fffffd8068a6ddc0,ffffffff829bd6e8,1) at in_pcballoc+0x59 sys/netinet/in_pcb.c:235 udp_attach(fffffd8068a6ddc0,0,1) at udp_attach+0xe4 sys/netinet/udp_usrreq.c:1091 socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b pru_attach sys/sys/protosw.h:272 [inline] socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b sys/kern/uipc_socket.c:197 sys_socket(ffff8000231d27e8,ffff80002e9a38c8,ffff80002e9a3910) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:98 syscall(ffff80002e9a3990) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc8c0602620, count: -10 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8261beb0) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff829c4028,9,ffff80002e9a3698) at pool_do_get+0x427 sys/kern/subr_pool.c:738 pool_get(ffffffff829c4028,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 in_pcballoc(fffffd8068a6ddc0,ffffffff829bd6e8,1) at in_pcballoc+0x59 sys/netinet/in_pcb.c:235 udp_attach(fffffd8068a6ddc0,0,1) at udp_attach+0xe4 sys/netinet/udp_usrreq.c:1091 socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b pru_attach sys/sys/protosw.h:272 [inline] socreate(2,ffff80002e9a3838,2,0) at socreate+0x22b sys/kern/uipc_socket.c:197 sys_socket(ffff8000231d27e8,ffff80002e9a38c8,ffff80002e9a3910) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:98 syscall(ffff80002e9a3990) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc8c0602620, count: -10