Re: problem booting kernel compiled with gcc-4.9

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> > [   53.693569]  sda: sda1 sda2 sda3 sda4
> > [   53.699149] sd 0:0:0:0: [sda] Attached SCSI disk
> > [   53.910103] EXT4-fs (sda2): couldn't mount as ext3 due to feature incompatibilities
> > [   54.011911] EXT4-fs (sda2): couldn't mount as ext2 due to feature incompatibilities
> > [   54.136507] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
> > [   54.237263] VFS: Mounted root (ext4 filesystem) readonly on device 8:2.
> 
> Do you see the above when the kernel boots properly with the older gcc?

Yes, these lines are normal on most of my machines (compiling only ext4 
and using it for ext2 and ext3 too if encountered).

In my reading of the dmesg and code, a fault in fault_in_user_windows is 
causing the trouble when copy_to_user into init process fails.

> > [   54.340199] devtmpfs: mounted
> > [   54.451346] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
> > [   54.451346] 
> > [   54.571516] CPU: 1 PID: 1 Comm: init Not tainted 3.16.0-rc2-00211-gd7933ab #96
> > [   54.666431] Call Trace:
> > [   54.698453]  [0000000000762f8c] panic+0xb0/0x224
> > [   54.759071]  [000000000045cf68] do_exit+0x948/0x960
> > [   54.823123]  [000000000042cbc0] fault_in_user_windows+0xe0/0x100
> > [   54.902036]  [0000000000404ad0] __handle_user_windows+0x0/0x10
> > [   54.978662] Press Stop-A (L1-A) to return to the boot prom
> > [   55.050713] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004


-- 
Meelis Roos (mroos@xxxxxxxx)
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