syzbot

uvm_fault(0xfffff9006fa24990, 0x98, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff82456b28 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff80003c3cb800
gsbase 0xffff80002999dff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff82456b28
Starting stack trace...
panic(ffffffff834f00ae) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80003c3cb750) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80003c3d27f8,fffff9006272b128,ffff80003c3cb930) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690
sys_futimes(ffff80003c3d27f8,ffff80003c3cba80,ffff80003c3cb9d0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2732
syscall(ffff80003c3cba80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3cba80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x576dcc669a0, count: 250
End of stack trace.
WARNING: SPL NOT LOWERED ON SYSCALL 2 661392793 EXIT 0 4
Stopped at      savectx+0xae:   movl    $0,%gs:0x688
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 240038  11500      0           0          0    0  syz-executor
*228780  32934      0         0x2          0    1  syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x6ffe97391960, count: 14
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