syzbot

uvm_fault(0xfffffd800b0633d0, 0x98, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff813c7438 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff800038fb37e0
gsbase 0xffff8000299adff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff813c7438
Starting stack trace...
panic(ffffffff83484b91) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff800038fb3730) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff8000357a4020,fffffd806f1b51c8,ffff800038fb38f0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2771
sys_futimens(ffff8000357a4020,ffff800038fb3a40,ffff800038fb3990) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2847
syscall(ffff800038fb3a40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800038fb3a40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x273425c5980, count: 250
End of stack trace.
WARNING: SPL NOT LOWERED ON SYSCALL 83 -1348398448 EXIT 0 4
Stopped at      savectx+0xae:   movl    $0,%gs:0x688
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*226415  32434      0           0  0x4000000    1  syz-executor
 278505   1350      0         0x2        0x1    0  syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x273968290e0, count: 14
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