panic: Caught invalid memory access at ffff800001ceabc0 size 24 op 1 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *405716 52457 0 0 0x4000000 1 syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84634053) at panic+0x270 sys/kern/subr_prf.c:198 kasan_memcpy(ffff800001ceabc0,ffffffff846635c0,18) at kasan_memcpy+0x1ec sysctl_sysvipc(ffff80003bb346e8,1,200000000040,ffff80003bb346c0) at sysctl_sysvipc+0x3f9 sysvipc_infoout sys/kern/kern_sysctl.c:2713 [inline] sysctl_sysvipc(ffff80003bb346e8,1,200000000040,ffff80003bb346c0) at sysctl_sysvipc+0x3f9 sys/kern/kern_sysctl.c:2776 kern_sysctl_dirs(33,ffff80003bb346e8,1,200000000040,ffff80003bb346c0,0,1,1ffff00007766854) at kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 kern_sysctl(ffff80003bb346e4,2,200000000040,ffff80003bb346c0,0,0,ffff80003bb34940) at kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 sys_sysctl(ffff8000299327e0,ffff80003bb34940,ffff80003bb348a0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb34940) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb34940) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee78c99d30, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: Caught invalid memory access at ffff800001ceabc0 size 24 op 1 ddb{1}> show kasan KASAN: invalid write of 24 bytes at 0xffff800001ceabc0 from pc 0xffffffff83477569 KASAN: first bad byte at 0xffff800001ceabc9 (+9); shadow 0x01: partial granule (out-of-bounds) KASAN: 0xffff800001ceabc9 is 9 bytes inside the 32-byte malloc slot [0xffff800001ceabc0..0xffff800001ceabe0) KASAN: allocated at: #0 malloc+0xda0 sys/kern/kern_malloc.c:446 #1 sysctl_sysvipc+0x3d7 sysvipc_infoout sys/kern/kern_sysctl.c:-1 [inline] #1 sysctl_sysvipc+0x3d7 sys/kern/kern_sysctl.c:2776 #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+0x3f9 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+0x3f9 sysvipc_infoout sys/kern/kern_sysctl.c:2713 [inline] #1 sysctl_sysvipc+0x3f9 sys/kern/kern_sysctl.c:2776 #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 0xffff800001ceaa80..0xffff800001cead00 (1 cell = 8 bytes): 0xffff800001ceaa80: 08 08 08 fb 08 08 fb fc fc 08 fc fc 08 08 fb fc 0xffff800001ceab00: fc 08 fc fc fc 08 fc fc 08 08 fb fc 08 04 fb fc >0xffff800001ceab80: fc 08 fc fc 08 08 fb fc 08[01]fb fc 08 08 fb fc 0xffff800001ceac00: fc 08 fc fc 08 04 fb fc fc 08 fc fc fc 08 fc fc 0xffff800001ceac80: 08 02 fb fc 08 08 08 fb fc 08 fc fc 08 08 08 fb 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{1}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84634053) at panic+0x270 sys/kern/subr_prf.c:198 kasan_memcpy(ffff800001ceabc0,ffffffff846635c0,18) at kasan_memcpy+0x1ec sysctl_sysvipc(ffff80003bb346e8,1,200000000040,ffff80003bb346c0) at sysctl_sysvipc+0x3f9 sysvipc_infoout sys/kern/kern_sysctl.c:2713 [inline] sysctl_sysvipc(ffff80003bb346e8,1,200000000040,ffff80003bb346c0) at sysctl_sysvipc+0x3f9 sys/kern/kern_sysctl.c:2776 kern_sysctl_dirs(33,ffff80003bb346e8,1,200000000040,ffff80003bb346c0,0,1,1ffff00007766854) at kern_sysctl_dirs+0x30f sys/kern/kern_sysctl.c:429 kern_sysctl(ffff80003bb346e4,2,200000000040,ffff80003bb346c0,0,0,ffff80003bb34940) at kern_sysctl+0x1ce sys/kern/kern_sysctl.c:529 sys_sysctl(ffff8000299327e0,ffff80003bb34940,ffff80003bb348a0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb34940) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb34940) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee78c99d30, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb33e50 rbx 0xffff80003bb33ec0 rdx 0 rcx 0xffff800028fe3ff0 rax 0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb33c38 r11 0xffffffff8263c7e0 x86_bus_space_io_read_1 r12 0xffffffff84634053 .str.5+0x9c553 r13 0xffff800028fe4c08 r14 0xffff800028fe4e07 r15 0x1 rip 0xffffffff81fd2ec7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb33e50 ss 0x10 db_enter+0x17: popq %rbp ddb{1}> show proc PROC (syz-executor) tid=405716 pid=52457 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=85, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bb3bcb0,0xffff8000298954d8 process=0xffff80003bb3f040 user=0xffff80003bb29000, vmspace=0xffff800001ad53e0 estcpu=35, cpticks=19, pctcpu=0.0, user=0, sys=19, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 52457 491241 35088 0 2 0 0xc80 syz-executor 52457 396308 35088 0 3 0 0x4000080 fsleep syz-executor *52457 405716 35088 0 7 0 0x4000000 syz-executor 52457 127676 35088 0 3 0 0x4000080 fsleep syz-executor 14776 116909 1 0 3 0x100003 0x80 ttyin getty 35088 384786 64267 0 2 0x2 0xc80 syz-executor 77547 348961 8673 0 3 0x100002 0x80 sbwait arp 8673 240412 32306 0 3 0x100002 0x88 sigsusp sh 60023 243983 64267 0 3 0x2 0x80 piperd syz-executor 26907 117195 64267 0 2 0x2 0xc80 syz-executor 54059 221162 64267 0 3 0x2 0x80 piperd syz-executor 70583 324397 64267 0 3 0x2 0x80 piperd syz-executor 32306 86338 64267 0 3 0x2 0x80 wait syz-executor 2685 337716 64267 0 3 0x2 0x80 piperd syz-executor 64267 233045 1 0 3 0x2 0x80 wait syz-executor 82054 179192 0 0 2 0x14000 0x40000200 smr 21204 217409 0 0 3 0x14000 0x200 pgzero zerothread 47223 310344 0 0 3 0x14000 0x200 aiodoned aiodoned 74199 298190 0 0 3 0x14000 0x200 syncer update 80855 16117 0 0 3 0x14000 0x200 cleaner cleaner 76991 456405 0 0 3 0x14000 0x200 reaper reaper 22139 44675 0 0 3 0x14000 0x200 pgdaemon pagedaemon 8335 508669 0 0 3 0x14000 0x200 bored viomb 13386 439772 0 0 3 0x14000 0x40000200 acpi0 acpi0 8193 412104 0 0 3 0x14000 0x40000200 idle1 72388 135577 0 0 3 0x14000 0x200 bored softnet1 7899 54579 0 0 3 0x14000 0x200 bored softnet0 53110 408320 0 0 3 0x14000 0x200 bored systqmp 60149 229673 0 0 3 0x14000 0x200 bored systq 25853 380818 0 0 2 0x14000 0x200 softclockmp 20451 61868 0 0 3 0x14000 0x40000200 tmoslp softclock 92184 130670 0 0 3 0x14000 0x40000200 idle0 1 478217 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &sched_lock r = 0 (0xffffffff85e348b0) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 wakeup_n+0xa5 sys/kern/kern_synch.c:581 #3 uvm_pmr_freepages+0x5a9 atomic_load_sint sys/uvm/uvmexp.h:-1 [inline] #3 uvm_pmr_freepages+0x5a9 sys/uvm/uvm_pmemrange.c:1343 #4 uvm_anfree+0x157 sys/uvm/uvm_anon.c:111 #5 amap_wipeout+0x276 sys/uvm/uvm_amap.c:-1 #6 uvm_unmap_detach+0x10b sys/uvm/uvm_map.c:1359 #7 uvm_map_teardown+0x53f sys/uvm/uvm_map.c:2536 #8 exit1+0xa58 sys/kern/kern_exit.c:260 #9 sys_exit+0x4a #10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff855176c8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 uvm_pmr_freepages+0x228 sys/uvm/uvm_pmemrange.c:-1 #3 uvm_anfree+0x157 sys/uvm/uvm_anon.c:111 #4 amap_wipeout+0x276 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x10b sys/uvm/uvm_map.c:1359 #6 uvm_map_teardown+0x53f sys/uvm/uvm_map.c:2536 #7 exit1+0xa58 sys/kern/kern_exit.c:260 #8 sys_exit+0x4a #9 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11057 12235K 13045K 166960K 12754 0 pcb 17 24K 24K 166960K 70 0 rtable 227 12K 12K 166960K 403 0 pf 35 22K 28K 166960K 71 0 ifaddr 41 11K 12K 166960K 58 0 ifgroup 55 2K 2K 166960K 81 0 sysctl 2 1K 13K 166960K 8 0 counters 70 42K 43K 166960K 84 0 ioctlops 0 0K 4K 166960K 1542 0 iov 0 0K 24K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1332 86K 86K 166960K 1735 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 10K 166960K 24 0 VM map 2 1K 1K 166960K 2 0 sem 20 1K 1K 166960K 101 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 12 45K 93K 166960K 599 0 sigio 0 0K 0K 166960K 9 0 proc 21 46K 177K 166960K 689 0 subproc 72 9K 9K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 133 0 in_multi 89 6K 6K 166960K 111 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 16 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 85 587K 587K 166960K 85 0 exec 0 0K 2K 166960K 416 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 105 130K 255K 166960K 7228 0 UVM aobj 32 4K 4K 166960K 33 0 pinsyscall 1040 1869K 1886K 166960K 1806 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 12 0K 1K 166960K 37 0 temp 49 9164K 9482K 166960K 13661 0 kqueue 2 8K 72K 166960K 133 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 41 0 40 1 0 1 1 0 8 0 rtentry 176 132 0 27 5 0 5 5 0 8 0 unpcb 144 441 0 440 2 1 1 2 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 90 0 89 3 2 1