uvm_fault(0xffffffff83aad520, 0xffff80001c4c3000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *189413 69376 0 0 0x4000001 0K syz-executor memset() at memset+0x52 ffs2_balloc(fffffd806c378278,14fc9,50,fffffd80097fd618,1,ffff8000347981d8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516 ffs_write(ffff800034798260) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806362c488,ffff800034798310,3,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a220548,fffffd806362c488,fffffd80097fd618,ffff8000347983e0,ffff8000347983c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a220548,36,0,ffff8000347984b0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a220548,36,0,ffff8000347984b0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff800034798560) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff800034798560) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce6fa0e9af0, count: 7 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: uvm_fault(0xffffffff83aad520, 0xffff80001c4c3000, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 ffs2_balloc(fffffd806c378278,14fc9,50,fffffd80097fd618,1,ffff8000347981d8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516 ffs_write(ffff800034798260) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806362c488,ffff800034798310,3,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a220548,fffffd806362c488,fffffd80097fd618,ffff8000347983e0,ffff8000347983c0) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a220548,36,0,ffff8000347984b0) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a220548,36,0,ffff8000347984b0) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff800034798560) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff800034798560) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce6fa0e9af0, count: -8 ddb{0}> show registers rdi 0xffff80001c4c3000 rsi 0 rbp 0xffff800034797fe0 rbx 0x4 rdx 0 rcx 0x100 rax 0 r8 0x800 r9 0x4cc28 acpi_pdirpa+0x38a99 r10 0xbba711c04ad0297a r11 0xffff80001c4c3000 r12 0xfffffd8078325158 r13 0x1800 __ALIGN_SIZE+0x800 r14 0x4cc28 acpi_pdirpa+0x38a99 r15 0xffff8000347981d8 rip 0xffffffff81871ac2 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff800034797f08 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=189413 pid=69376 tcnt=2 stat=onproc flags process=0 proc=4000001 runpri=32, usrpri=81, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a220018,0xffff80002a221cb0 process=0xffff8000ffff1820 user=0xffff800034793000, vmspace=0xfffffd806f389b78 estcpu=31, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90515 362974 87600 0 2 0x100000 sh 87600 25599 57573 0 3 0x10008a sigsusp sh 52703 310635 44463 0 2 0xc80 syz-executor 52703 364521 44463 0 3 0x4000080 kqsel syz-executor 52703 510458 44463 0 3 0x4000080 fsleep syz-executor 52703 304493 44463 0 3 0x4000080 fsleep syz-executor 56709 273954 8523 0 2 0 syz-executor 56709 333827 8523 0 3 0x4000080 fsleep syz-executor 4735 16357 85444 0 2 0 syz-executor 4735 432802 85444 0 3 0x4000080 lockf syz-executor 51586 359440 74012 0 2 0 syz-executor 51586 283314 74012 0 3 0x4000080 fsleep syz-executor 51958 458095 28065 60929 2 0x10 syz-executor 51958 171190 28065 60929 3 0x4000090 fsleep syz-executor 80653 202399 99887 60929 2 0x10 syz-executor 80653 107247 99887 60929 3 0x4000090 fsleep syz-executor 80653 200631 99887 60929 3 0x4000090 fsleep syz-executor 69376 355540 61002 0 2 0 syz-executor *69376 189413 61002 0 7 0x4000001 syz-executor 57573 370943 97375 0 3 0x82 wait syz-executor 44463 102173 97375 0 2 0xc82 syz-executor 99887 415799 97375 0 2 0xc82 syz-executor 79844 478435 1 0 3 0x100083 ttyin getty 8523 409424 97375 0 2 0xc82 syz-executor 43198 325503 0 0 3 0x14280 nfsidl nfsio 4391 350542 0 0 3 0x14280 nfsidl nfsio 96294 426864 0 0 3 0x14280 nfsidl nfsio 19921 353833 0 0 3 0x14280 nfsidl nfsio 56516 134751 0 0 3 0x14280 nfsidl nfsio 87263 350261 0 0 3 0x14280 nfsidl nfsio 16928 50469 0 0 3 0x14280 nfsidl nfsio 88891 378889 0 0 3 0x14280 nfsidl nfsio 31198 377848 0 0 3 0x14280 nfsidl nfsio 69418 68650 0 0 3 0x14280 nfsidl nfsio 16052 282179 0 0 3 0x14280 nfsidl nfsio 10238 184704 0 0 3 0x14280 nfsidl nfsio 28530 408102 0 0 3 0x14280 nfsidl nfsio 61757 307528 0 0 3 0x14280 nfsidl nfsio 17272 53060 0 0 3 0x14280 nfsidl nfsio 23606 510031 0 0 3 0x14280 nfsidl nfsio 45442 296611 0 0 3 0x14280 nfsidl nfsio 26872 188353 0 0 3 0x14280 nfsidl nfsio 25482 9264 0 0 3 0x14280 nfsidl nfsio 21175 262784 0 0 3 0x14280 nfsidl nfsio 85444 518237 97375 0 2 0xc82 syz-executor 74012 363649 97375 0 2 0xc82 syz-executor 28065 203404 97375 0 2 0xc82 syz-executor 61002 15020 97375 0 2 0xc82 syz-executor 97375 412987 1 0 2 0x2 syz-executor 20792 325201 0 0 3 0x14200 bored smr 36166 355089 0 0 2 0x14200 zerothread 4035 438230 0 0 3 0x14200 aiodoned aiodoned 47431 316074 0 0 3 0x14200 syncer update 4051 51944 0 0 3 0x14200 cleaner cleaner 37361 446545 0 0 3 0x14200 reaper reaper 10426 176659 0 0 3 0x14200 pgdaemon pagedaemon 55464 432662 0 0 3 0x14200 bored viomb 94429 204460 0 0 3 0x40014200 acpi0 acpi0 69081 165411 0 0 7 0x40014200 idle1 26403 524132 0 0 3 0x14200 bored softnet1 71536 315104 0 0 3 0x14200 bored softnet0 31269 476413 0 0 3 0x14200 bored systqmp 41420 368301 0 0 3 0x14200 bored systq 8112 146833 0 0 3 0x14200 tmoslp softclockmp 88423 376585 0 0 3 0x40014200 tmoslp softclock 81608 502151 0 0 3 0x40014200 idle0 1 270863 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 69376 (syz-executor) thread 0xffff80002a220548 (189413) ddb{0}>