Re: [Xen-devel] Xen with dom0 pvops on ultra-recent "git tip" kernel on x86_64

[Christophe Saout <christophe@xxxxxxxx>]

And hello once more,

> > > However, after one page of output it then Oopses somewhere during
> > > fsck.reiserfs in "grab_swap_tokens".
> 
> Hmm, I found this patch in the SuSE kernel where they just return from
> grab_swap_tokens if current->mm is NULL and claim that it can happen
> (?).

Urks, ok, that workaround is probably total BS.  It is supposed to help
when the current process is a kernel thread, and not reiserfsck.  So the
point really is how come that current->mm is NULL at that point.

My workaround leaves me with the attached ugly messages in the log,
which is possibly the cause for the lockup later. (*)

So, my latest one is here:

http://git.saout.de/gitweb/?p=linux-dom0-pvops.git;a=summary

(and forget that very last patch)

Cheers,
        Christophe


(*)

Jan 11 17:05:30 leto swap_dup: Bad swap file entry 80000000003ab1d0
Jan 11 17:05:30 leto swap_dup: Bad swap file entry 80000000003a19c0
Jan 11 17:05:30 leto swap_free: Bad swap file entry 80000000003ab1d0
Jan 11 17:05:30 leto BUG: Bad page map in process fsck.reiserfs  pte:7563a020 
pmd:7196f067
Jan 11 17:05:30 leto addr:00000030e3c04000 vm_flags:08000070 anon_vma:(null) 
mapping:ffff880073513950 index:4
Jan 11 17:05:30 leto vma->vm_ops->fault: filemap_fault+0x0/0x440
Jan 11 17:05:30 leto vma->vm_file->f_op->mmap: reiserfs_file_mmap+0x0/0x70
Jan 11 17:05:30 leto Pid: 3012, comm: fsck.reiserfs Not tainted 
2.6.29-rc0-xen-cs1 #1
Jan 11 17:05:30 leto Call Trace:
Jan 11 17:05:30 leto [<ffffffff802ab120>] print_bad_pte+0x1e0/0x2c0
Jan 11 17:05:30 leto [<ffffffff802ac6cd>] unmap_vmas+0x86d/0xaa0
Jan 11 17:05:30 leto [<ffffffff8029f801>] ____pagevec_lru_add+0x151/0x170
Jan 11 17:05:30 leto [<ffffffff802b1f82>] exit_mmap+0xa2/0x170
Jan 11 17:05:30 leto [<ffffffff80247010>] mmput+0x30/0xd0
Jan 11 17:05:30 leto [<ffffffff8024b376>] exit_mm+0x106/0x140
Jan 11 17:05:30 leto [<ffffffff8024d0f4>] do_exit+0x114/0x8e0
Jan 11 17:05:30 leto [<ffffffff802ed15d>] vfs_fsync+0xbd/0x110
Jan 11 17:05:30 leto [<ffffffff8024d8f7>] do_group_exit+0x37/0xb0
Jan 11 17:05:30 leto [<ffffffff802135aa>] system_call_fastpath+0x16/0x1b
Jan 11 17:05:30 leto swap_free: Bad swap file entry 80000000003a19c0
Jan 11 17:05:30 leto BUG: Bad page map in process fsck.reiserfs  pte:74338020 
pmd:731b6067
Jan 11 17:05:30 leto addr:0000003644348000 vm_flags:08000070 anon_vma:(null) 
mapping:ffff8800734f17f0 index:148
Jan 11 17:05:30 leto vma->vm_ops->fault: filemap_fault+0x0/0x440
Jan 11 17:05:30 leto vma->vm_file->f_op->mmap: reiserfs_file_mmap+0x0/0x70
Jan 11 17:05:30 leto Pid: 3012, comm: fsck.reiserfs Tainted: G    B      
2.6.29-rc0-xen-cs1 #1
Jan 11 17:05:30 leto Call Trace:
Jan 11 17:05:30 leto [<ffffffff802ab120>] print_bad_pte+0x1e0/0x2c0
Jan 11 17:05:30 leto [<ffffffff802ac6cd>] unmap_vmas+0x86d/0xaa0
Jan 11 17:05:30 leto [<ffffffff8029f801>] ____pagevec_lru_add+0x151/0x170
Jan 11 17:05:30 leto [<ffffffff802b1f82>] exit_mmap+0xa2/0x170
Jan 11 17:05:30 leto [<ffffffff80247010>] mmput+0x30/0xd0
Jan 11 17:05:30 leto [<ffffffff8024b376>] exit_mm+0x106/0x140
Jan 11 17:05:30 leto [<ffffffff8024d0f4>] do_exit+0x114/0x8e0
Jan 11 17:05:30 leto [<ffffffff802ed15d>] vfs_fsync+0xbd/0x110
Jan 11 17:05:30 leto [<ffffffff8024d8f7>] do_group_exit+0x37/0xb0
Jan 11 17:05:30 leto [<ffffffff802135aa>] system_call_fastpath+0x16/0x1b



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