login: uvm_fault(0xffffffff839feec0, 0xffff8000293a2000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *149443 61375 0 0x1004 0 0 syz-executor memset() at memset+0x52 ffs_write(ffff80002f0b7320) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffff7006d5b7620,ffff80002f0b73b0,0,fffff70007ffd4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffff70078f09c38,ffff80002f0b7530,a,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffff70078f09c38,fffff700073eb480,ffff80002f0b75d0,ffff80002f0b75f4,39,0,46a6833f342a1777) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffff70078f09c38,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffff70078f09c38) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002f0b7718,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff8000338d4a90,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff8000338d4a90,ffff80002f0b7da0,ffff80002f0b7cf0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002f0b7da0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0b7da0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7762e9f6c280, count: 3 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: uvm_fault(0xffffffff839feec0, 0xffff8000293a2000, 0, 2) -> d ddb> show kasan No such command ddb> trace memset() at memset+0x52 ffs_write(ffff80002f0b7320) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffff7006d5b7620,ffff80002f0b73b0,0,fffff70007ffd4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffff70078f09c38,ffff80002f0b7530,a,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffff70078f09c38,fffff700073eb480,ffff80002f0b75d0,ffff80002f0b75f4,39,0,46a6833f342a1777) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:531 uvn_flush(fffff70078f09c38,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffff70078f09c38) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002f0b7718,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvmspace_exec(ffff8000338d4a90,1000,7f7fffffc000) at uvmspace_exec+0x451 sys/uvm/uvm_map.c:3404 sys_execve(ffff8000338d4a90,ffff80002f0b7da0,ffff80002f0b7cf0) at sys_execve+0xc61 sys/kern/kern_exec.c:474 syscall(ffff80002f0b7da0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0b7da0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7762e9f6c280, count: -12 ddb> show registers rdi 0xffff8000293a2000 rsi 0 rbp 0xffff80002f0b7240 rbx 0xfffff7006d457800 rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0xffff80002f0b7198 r10 0xfedef90dea0652c2 r11 0xffff8000293a2000 r12 0x1 r13 0xffff800000c48800 r14 0xfffff70078fc1330 r15 0x25968 acpi_pdirpa+0x117d9 rip 0xffffffff8215bb22 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002f0b70c8 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor) tid=149443 pid=61375 tcnt=1 stat=onproc flags process=1004 proc=0 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000338d4a90 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f0b0a78,0xffffffff839a6858 process=0xffff80002a82cda0 user=0xffff80002f0b2000, vmspace=0xfffff7007f234a10 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *61375 149443 1 0 7 0x1004 0 syz-executor 63808 351111 1 0 3 0x100003 0x80 ttyin getty 33277 508214 0 0 3 0x14000 0x280 nfsidl nfsio 98981 361012 0 0 3 0x14000 0x280 nfsidl nfsio 38348 122486 0 0 3 0x14000 0x280 nfsidl nfsio 6100 336717 0 0 3 0x14000 0x280 nfsidl nfsio 32089 453919 0 0 3 0x14000 0x280 nfsidl nfsio 16685 258922 0 0 3 0x14000 0x280 nfsidl nfsio 45564 109973 0 0 3 0x14000 0x280 nfsidl nfsio 9205 442911 0 0 3 0x14000 0x280 nfsidl nfsio 96244 498214 0 0 3 0x14000 0x280 nfsidl nfsio 51634 429810 0 0 3 0x14000 0x280 nfsidl nfsio 97269 70879 0 0 3 0x14000 0x280 nfsidl nfsio 98372 161825 0 0 3 0x14000 0x280 nfsidl nfsio 72206 45794 0 0 3 0x14000 0x280 nfsidl nfsio 49559 332438 0 0 3 0x14000 0x280 nfsidl nfsio 65784 137004 0 0 3 0x14000 0x280 nfsidl nfsio 71059 229840 0 0 3 0x14000 0x280 nfsidl nfsio 57227 292011 0 0 3 0x14000 0x280 nfsidl nfsio 75118 141640 0 0 3 0x14000 0x280 nfsidl nfsio 78196 248727 0 0 3 0x14000 0x280 nfsidl nfsio 84234 78467 0 0 3 0x14000 0x280 nfsidl nfsio 55843 462294 1 0 3 0x2 0x80 nanoslp syz-executor 36073 497041 0 0 3 0x14000 0x200 bored smr 40234 249041 0 0 2 0x14000 0x200 zerothread 55476 223239 0 0 3 0x14000 0x200 aiodoned aiodoned 5492 214965 0 0 3 0x14000 0x200 syncer update 64266 122689 0 0 3 0x14000 0x200 cleaner cleaner 69776 439939 0 0 3 0x14000 0x200 reaper reaper 14890 444740 0 0 3 0x14000 0x200 pgdaemon pagedaemon 4848 139613 0 0 3 0x14000 0x200 bored viomb 76751 42340 0 0 3 0x14000 0x40000200 acpi0 acpi0 5622 403126 0 0 3 0x14000 0x200 bored softnet0 90036 387994 0 0 3 0x14000 0x200 bored systqmp 46187 510764 0 0 3 0x14000 0x200 bored systq 23838 193308 0 0 3 0x14000 0x40000200 tmoslp softclock 39714 40291 0 0 3 0x14000 0x40000200 idle0 1 169583 0 0 3 0x80002 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11012 12093K 12526K 166960K 13535 0 pcb 17 14K 14K 166960K 274 0 rtable 94 4K 10K 166960K 567 0 pf 18 11K 19K 166960K 116 0 ifaddr 14 2K 8K 166960K 77 0 ifgroup 22 1K 2K 166960K 112 0 sysctl 4 1K 9K 166960K 24 0 counters 26 16K 18K 166960K 67 0 ioctlops 0 0K 4K 166960K 494 0 iov 0 0K 16K 166960K 50 0 mount 1 1K 1K 166960K 1 0 log 0 0K 8K 166960K 5 0 vnodes 1347 85K 85K 166960K 2126 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 72 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 3 9K 240K 166960K 1255 0 sigio 0 0K 0K 166960K 13 0 proc 20 25K 91K 166960K 665 0 subproc 9 0K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 161 0 in_multi 19 1K 7K 166960K 141 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 24 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 1 0K 1K 166960K 531 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 27 14K 178K 166960K 12267 0 UVM aobj 88 5K 5K 166960K 91 0 pinsyscall 7 14K 95K 166960K 2511 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 37 0 NDP 4 0K 2K 166960K 53 0 temp 18 9110K 9176K 166960K 52835 0 kqueue 0 0K 34K 166960K 239 0 SYN cache 2 16K 16K 166960K 2 0 ddb>