syzbot

login: uvm_fault(0xfffffd806c6f87b8, 0x98, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff82587568 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff800039bb9730
gsbase 0xffff8000299adff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff82587568
Starting stack trace...
panic(ffffffff83481399) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff800039bb9680) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80003c3fda18,fffffd805fb9da28,ffff800039bb9840) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2771
sys_futimens(ffff80003c3fda18,ffff800039bb9990,ffff800039bb98e0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2847
syscall(ffff800039bb9990) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039bb9990) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x79eb709d030, count: 250
End of stack trace.
WARNING: SPL NOT LOWERED ON SYSCALL 83 344831840 EXIT 0 4
Stopped at      savectx+0xae:   movl    $0,%gs:0x688
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*489604  49514      0           0  0x4000000    1  syz-executor
 273167  96953      0         0x2          0    0  syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x9791e1eff70, count: 14
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