uvm_fault(0xfffffd806f3edd60, 0x98, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81ab3eb8 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff80002a240850 gsbase 0xffff8000299bdff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81ab3eb8 Starting stack trace... panic(ffffffff83487d88) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a2407a0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff8000fffeea80,fffffd807a9791d0,ffff80002a240960) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2771 sys_futimens(ffff8000fffeea80,ffff80002a240ab0,ffff80002a240a00) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2847 syscall(ffff80002a240ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a240ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fd1c0cb3d0, count: 250 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 193089 49964 0 0 0 0 syz-executor *509880 56716 0 0 0 1 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x789e290f51e0, count: 14 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806f3edd60, 0x98, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x789e290f51e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4491e0 rbx 0 rdx 0 rcx 0xffff80002a243a00 rax 0x2a r8 0xffff80003c449110 r9 0x1 r10 0xc0c38212eec4c128 r11 0xb50289644a82057f r12 0 r13 0xffffffff81e65628 Xdoreti+0x18 r14 0 r15 0 rip 0xffffffff817bd4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c449160 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=509880 pid=56716 tcnt=2 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a243768,0xffff8000fffef788 process=0xffff8000ffff44d8 user=0xffff80003c444000, vmspace=0xfffffd806f3ed7a8 estcpu=36, cpticks=4, pctcpu=0.0, user=4, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49964 193089 87229 0 7 0 syz-executor 49964 446190 87229 0 3 0x4000000 sbar syz-executor 2219 232020 75483 0 3 0x80 nanoslp syz-executor 2219 306501 75483 0 3 0x4000080 fsleep syz-executor *56716 509880 61782 0 7 0 syz-executor 56716 497699 61782 0 3 0x4000080 kqread syz-executor 40898 301634 39125 0 2 0 syz-executor 40898 329842 39125 0 3 0x4000080 kqread syz-executor 40898 429799 39125 0 3 0x4000080 kqread syz-executor 40898 20547 39125 0 3 0x4000080 fsleep syz-executor 13546 462292 1 0 3 0x100083 ttyin getty 70953 198872 65059 0 3 0x82 nanoslp syz-executor 39125 438760 65059 0 3 0x82 nanoslp syz-executor 61782 395845 65059 0 3 0x82 nanoslp syz-executor 13455 201889 65059 0 3 0x82 nanoslp syz-executor 4775 430699 0 0 3 0x14200 acct acct 80661 398518 65059 0 3 0x82 wait syz-executor 74364 481920 65059 0 3 0x82 nanoslp syz-executor 87229 510664 65059 0 3 0x82 nanoslp syz-executor 75483 457243 65059 0 3 0x82 nanoslp syz-executor 65059 124325 1 0 3 0x82 kqread syz-executor 89805 113201 0 0 3 0x14200 bored smr 64876 421553 0 0 3 0x14200 pgzero zerothread 62134 77529 0 0 3 0x14200 aiodoned aiodoned 48730 295818 0 0 3 0x14200 syncer update 40448 299314 0 0 3 0x14200 cleaner cleaner 54140 504296 0 0 3 0x14200 reaper reaper 46250 521042 0 0 3 0x14200 pgdaemon pagedaemon 23950 216274 0 0 3 0x14200 bored viomb 93771 15676 0 0 3 0x40014200 acpi0 acpi0 70288 317161 0 0 3 0x40014200 idle1 40122 389811 0 0 3 0x14200 bored softnet1 29109 515645 0 0 2 0x14200 softnet0 59367 146117 0 0 2 0x40014200 systqmp 80211 387932 0 0 3 0x14200 bored systq 82952 40694 0 0 3 0x14200 tmoslp softclockmp 4019 416158 0 0 3 0x40014200 tmoslp softclock 49110 209639 0 0 3 0x40014200 idle0 1 371011 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 49964 (syz-executor) thread 0xffff8000fffeea80 (446190) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839d2f80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{1}>