panic: Caught invalid memory access at ffff8000018d0470 size 20 op 1 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 96959 25323 0 0 0x4000000 0 syz-executor 244676 97661 0 0x14000 0x200 1K update db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff846367f9) at panic+0x270 sys/kern/subr_prf.c:198 kasan_memcpy(ffff8000018d0470,ffff80003bb50670,14) at kasan_memcpy+0x1ec sysctl_sysvipc(ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0) at sysctl_sysvipc+0x63a sys/kern/kern_sysctl.c:2771 kern_sysctl_dirs(33,ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0,0,1,1ffff0000776a114) at kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 kern_sysctl(ffff80003bb50ce4,2,200000000180,ffff80003bb50cc0,0,fffa,ffff80003bb50f30) at kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 sys_sysctl(ffff800045ff5248,ffff80003bb50f30,ffff80003bb50ea0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb50f30) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb50f30) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9f52bc25e0, count: 6 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 *cpu0: Caught invalid memory access at ffff8000018d0470 size 20 op 1 ddb{0}> show kasan KASAN: invalid write of 20 bytes at 0xffff8000018d0470 from pc 0xffffffff82cb67aa KASAN: first bad byte at 0xffff8000018d0471 (+1); shadow 0x01: partial granule (out-of-bounds) KASAN: 0xffff8000018d0471 is 1 bytes inside the 16-byte malloc slot [0xffff8000018d0470..0xffff8000018d0480) KASAN: allocated at: #0 malloc+0xda0 sys/kern/kern_malloc.c:446 #1 sysctl_sysvipc+0x619 sys/kern/kern_sysctl.c:2766 #2 kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 #3 kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 #4 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #5 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 KASAN: pc: sysctl_sysvipc+0x63a KASAN: call trace: #0 kasan_memcpy+0x1ca kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] #0 kasan_memcpy+0x1ca sys/kern/subr_kasan.c:1025 #1 sysctl_sysvipc+0x63a sys/kern/kern_sysctl.c:2771 #2 kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 #3 kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 #4 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #5 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 KASAN: shadow of 0xffff8000018d0300..0xffff8000018d0580 (1 cell = 8 bytes): 0xffff8000018d0300: fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 0xffff8000018d0380: fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 >0xffff8000018d0400: fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08[01]fb 0xffff8000018d0480: 08 fb 08 fb fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 0xffff8000018d0500: fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 fc 08 KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff846367f9) at panic+0x270 sys/kern/subr_prf.c:198 kasan_memcpy(ffff8000018d0470,ffff80003bb50670,14) at kasan_memcpy+0x1ec sysctl_sysvipc(ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0) at sysctl_sysvipc+0x63a sys/kern/kern_sysctl.c:2771 kern_sysctl_dirs(33,ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0,0,1,1ffff0000776a114) at kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 kern_sysctl(ffff80003bb50ce4,2,200000000180,ffff80003bb50cc0,0,fffa,ffff80003bb50f30) at kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 sys_sysctl(ffff800045ff5248,ffff80003bb50f30,ffff80003bb50ea0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb50f30) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb50f30) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9f52bc25e0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb50430 rbx 0xffff80003bb504a0 rdx 0 rcx 0xffffffff84f17ff0 cpu_info_full_primary+0x1ff0 rax 0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb50048 r11 0xffffffff81565e60 x86_bus_space_io_read_1 r12 0xffffffff846367f9 .str.4+0x9df59 r13 0xffffffff84f18c08 cpu_info_full_primary+0x2c08 r14 0xffffffff84f18e07 cpu_info_full_primary+0x2e07 r15 0x1 rip 0xffffffff823f2eb7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb50430 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=96959 pid=25323 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003ab382c8,0xffff800045ff5788 process=0xffff80003ab3f9e0 user=0xffff80003bb45000, vmspace=0xffff800001c403e8 estcpu=29, cpticks=19, pctcpu=0.19, user=0, sys=19, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11953 409188 75241 0 2 0 syz-executor 11953 56365 75241 0 3 0x4000080 fsleep syz-executor 82000 402187 67603 0 2 0 syz-executor 82000 356861 67603 0 3 0x4000080 kqread syz-executor 67996 387991 39797 0 2 0 syz-executor 67996 336296 39797 0 3 0x4000080 ttyin syz-executor 35254 231709 10915 0 2 0 syz-executor 35254 260784 10915 0 2 0x4000000 syz-executor 35254 196809 10915 0 3 0x4000080 fsleep syz-executor 35254 221586 10915 0 2 0x4000000 syz-executor 25323 275904 50674 0 2 0 syz-executor *25323 96959 50674 0 7 0x4000000 syz-executor 25323 506336 50674 0 3 0x4000080 fsleep syz-executor 5214 357187 95255 0 2 0xc80 syz-executor 5214 256838 95255 0 3 0x4000080 pipewr syz-executor 5214 87043 95255 0 3 0x4000080 pipewr syz-executor 85018 180845 16911 0 2 0xc80 syz-executor 85018 382997 16911 0 3 0x4000080 piperd syz-executor 85018 505922 16911 0 3 0x4000080 fsleep syz-executor 16911 135873 4427 0 2 0xc82 syz-executor 39826 186329 4427 0 2 0x2 syz-executor 67603 304954 4427 0 2 0xc82 syz-executor 39797 272463 4427 0 2 0xc82 syz-executor 75241 188552 4427 0 2 0xc82 syz-executor 95255 162355 4427 0 2 0xc82 syz-executor 10915 6396 4427 0 2 0xc82 syz-executor 50674 374205 4427 0 2 0xc82 syz-executor 4427 285332 59005 0 3 0x82 kqread syz-executor 59005 389696 19997 0 3 0x10008a sigsusp ksh 19997 438440 45323 0 3 0x98 kqread sshd-session 45323 212684 39759 0 3 0x92 kqread sshd-session 51658 239799 1 0 3 0x100083 ttyin getty 39759 122291 1 0 3 0x88 kqread sshd 35322 416137 9963 74 3 0x1100092 bpf pflogd 9963 97631 1 0 3 0x80 sbwait pflogd 42686 517569 19319 73 2 0x1100090 syslogd 19319 411999 1 0 3 0x100082 sbwait syslogd 15793 33444 1 0 3 0x100080 kqread resolvd 50259 163811 66218 77 3 0x100092 kqread dhcpleased 86748 271394 66218 77 3 0x100092 kqread dhcpleased 66218 33614 1 0 3 0x80 kqread dhcpleased 36555 429642 0 0 2 0x14200 smr 99250 452001 0 0 2 0x14200 zerothread 16702 436860 0 0 3 0x14200 aiodoned aiodoned 97661 244676 0 0 7 0x14200 update 80731 414727 0 0 3 0x14200 cleaner cleaner 37156 385301 0 0 3 0x14200 reaper reaper 66587 220585 0 0 3 0x14200 pgdaemon pagedaemon 72840 246889 0 0 3 0x14200 bored viomb 17215 140627 0 0 3 0x40014200 acpi0 acpi0 8344 19325 0 0 3 0x40014200 idle1 34793 198328 0 0 3 0x14200 bored softnet1 92577 15779 0 0 3 0x14200 bored softnet0 78844 223453 0 0 3 0x14200 bored systqmp 10407 72147 0 0 3 0x14200 bored systq 69863 379296 0 0 3 0x14200 tmoslp softclockmp 88253 413038 0 0 3 0x40014200 tmoslp softclock 8798 414629 0 0 3 0x40014200 idle0 1 463088 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 35254 (syz-executor) thread 0xffff800045ff47e8 (260784) Process 39826 (syz-executor) thread 0xffff800045ffcd10 (186329) Process 97661 (update) thread 0xffff8000298a5230 (244676) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11063 12320K 12504K 166960K 12291 0 pcb 18 26K 27K 166960K 41 0 rtable 241 12K 13K 166960K 355 0 pf 34 22K 24K 166960K 52 0 ifaddr 43 12K 12K 166960K 47 0 ifgroup 55 2K 2K 166960K 64 0 sysctl 4 1K 13K 166960K 9 0 counters 70 42K 43K 166960K 74 0 ioctlops 0 0K 4K 166960K 1500 0 iov 1 1K 12K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1303 84K 84K 166960K 1542 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 261 0 sigio 0 0K 0K 166960K 3 0 proc 71 128K 161K 166960K 569 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 4 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 55 384K 384K 166960K 55 0 exec 0 0K 2K 166960K 388 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 231 232K 254K 166960K 4145 0 UVM aobj 41 5K 5K 166960K 41 0 pinsyscall 1066 1770K 1770K 166960K 1420 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 1K 166960K 30 0 temp 42 9163K 9182K 166960K 6288 0 kqueue 16 52K 52K 166960K 54 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 35 0 32 1 0 1 1 0 8 0 rtentry 176 113 0 1 6 0 6 6 0 8 0 unpcb 144 200 0 182 3 0 3 3 0 8 2 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 56 0 52 4 0 4 4 0 8 3 arp 136 19 0 0 1 0 1 1 0 8 0 inpcb 328 190 0 179 7 0 7 7 0 8 6 nd6 152 25 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 1 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 28 0 0 1 0 1 1 0 8 0 pfstkey 128 28 0 0 1 0 1 1 0 8 0 pfstate 448 28 0 0 4 0 4 4 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 256 455 0 0 29 0 29 29 0 8 0 art_table 40 456 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semapl 72 3 0 0 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 dino2pl 256 1844 0 369 93 0 93 93 0 8 0 ffsino 296 1844 0 369 114 0 114 114 0 8 0 nchpl 144 2237 0 533 64 0 64 64 0 8 0 vnodes 216 2023 0 0 113 0 113 113 0 8 0 namei 1024 7113 0 7113 3 2 1 2 0 8 1 percpumem 16 53 0 2 1 0 1 1 0 8 0 kstatmem 264 31 0 4 2 0 2 2 0 8 0 scxspl 216 8052 0 8050 10 9 1 8 1 8 0 plimitpl 152 38 0 20 1 0 1 1 0 8 0 sigapl 424 599 0 552 9 3 6 9 0 8 0 knotepl 120 67 0 0 3 0 3 3 0 8 0 kqueuepl 224 66 0 53 1 0 1 1 0 8 0 pipepl 344 150 0 121 3 0 3 3 0 8 0 fdescpl 528 563 0 532 3 0 3 3 0 8 0 filepl 160 2592 0 2361 14 1 13 13 0 8 3 lockfpl 104 82 0 76 1 0 1 1 0 8 0 lockfspl 48 37 0 32 1 0 1 1 0 8 0 sessionpl 144 62 0 53 1 0 1 1 0 8 0 pgrppl 48 71 0 54 1 0 1 1 0 8 0 ucredpl 104 393 0 379 1 0 1 1 0 8 0 zombiepl 144 572 0 572 2 1 1 1 0 8 1 processpl 1232 599 0 552 6 1 5 6 0 8 0 procpl 664 846 0 786 7 1 6 7 0 8 0 sosppl 176 3 0 2 2 1 1 1 0 8 0 sockpl 752 430 0 398 12 0 12 12 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 1 15 16 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mextrefs 64 24 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 215 0 0 14 0 14 14 0 8 0 bufpl 272 2540 0 105 163 0 163 163 0 8 0 anonpl 32 3866 0 0 32 0 32 32 0 222 0 amapchunkpl 152 11969 0 11497 22 2 20 22 0 158 1 amappl16 200 2138 0 2107 6 4 2 5 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 432 0 430 1 0 1 1 0 8 0 amappl13 176 129 0 117 1 0 1 1 0 8 0 amappl12 168 814 0 784 2 0 2 2 0 8 0 amappl11 160 20 0 20 1 1 0 1 0 8 0 amappl10 152 66 0 51 1 0 1 1 0 8 0 amappl9 144 296 0 296 1 1 0 1 0 8 0 amappl8 136 96 0 94 1 0 1 1 0 8 0 amappl7 128 160 0 147 1 0 1 1 0 8 0 amappl6 120 160 0 159 1 0 1 1 0 8 0 amappl5 112 104 0 93 1 0 1 1 0 8 0 amappl4 104 302 0 283 1 0 1 1 0 8 0 amappl3 96 2338 0 2226 4 0 4 4 0 8 1 amappl2 88 553 0 488 2 0 2 2 0 8 0 amappl1 80 11107 0 10501 16 3 13 15 0 8 0 amappl 88 3396 0 3236 5 0 5 5 0 92 0 uvmvnodes 80 106 0 0 3 0 3 3 0 8 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 40 0 0 1 0 1 1 0 8 0 uaddrrnd 24 563 0 532 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 563 0 532 1 0 1 1 0 8 0 vmmpekpl 168 6789 0 6749 3 0 3 3 0 8 1 vmmpepl 168 45342 0 43419 89 3 86 89 0 357 1 vmsppl 488 562 0 532 5 1 4 5 0 8 0 rwobjpl 80 16301 0 15218 25 1 24 25 0 8 0 pdppl 4096 1135 0 1064 99 26 73 89 0 8 2 pvpl 32 11059 0 0 90 0 90 90 0 265 0 pmappl 256 562 0 532 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 120 444 0 34 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff846367f9) at panic+0x270 sys/kern/subr_prf.c:198 kasan_memcpy(ffff8000018d0470,ffff80003bb50670,14) at kasan_memcpy+0x1ec sysctl_sysvipc(ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0) at sysctl_sysvipc+0x63a sys/kern/kern_sysctl.c:2771 kern_sysctl_dirs(33,ffff80003bb50ce8,1,200000000180,ffff80003bb50cc0,0,1,1ffff0000776a114) at kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 kern_sysctl(ffff80003bb50ce4,2,200000000180,ffff80003bb50cc0,0,fffa,ffff80003bb50f30) at kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 sys_sysctl(ffff800045ff5248,ffff80003bb50f30,ffff80003bb50ea0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb50f30) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb50f30) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa9f52bc25e0, count: -9 ddb{0}> machine ddbcpu 1