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Re: XFS WARN_ON in xfs_vm_writepage

To: Dave Jones <davej@xxxxxxxxxx>, xfs@xxxxxxxxxxx, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>
Subject: Re: XFS WARN_ON in xfs_vm_writepage
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 13 Jun 2014 16:26:45 +1000
Cc: linux-mm@xxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140613051631.GA9394@xxxxxxxxxx>
References: <20140613051631.GA9394@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
[cc linux-mm]

On Fri, Jun 13, 2014 at 01:16:31AM -0400, Dave Jones wrote:
> Just hit this on Linus' tree from earlier this afternoon..
> 
> WARNING: CPU: 3 PID: 19721 at fs/xfs/xfs_aops.c:971 
> xfs_vm_writepage+0x5ce/0x630 [xfs]()
> CPU: 3 PID: 19721 Comm: trinity-c61 Not tainted 3.15.0+ #3
>  0000000000000009 000000004f70ab82 ffff8801d5ebf578 ffffffff8373215c
>  0000000000000000 ffff8801d5ebf5b0 ffffffff8306f7cd ffff88023dd543e0
>  ffffea000254a3c0 ffff8801d5ebf820 ffffea000254a3e0 ffff8801d5ebf728
> Call Trace:
>  [<ffffffff8373215c>] dump_stack+0x4e/0x7a
>  [<ffffffff8306f7cd>] warn_slowpath_common+0x7d/0xa0
>  [<ffffffff8306f8fa>] warn_slowpath_null+0x1a/0x20
>  [<ffffffffc023068e>] xfs_vm_writepage+0x5ce/0x630 [xfs]
>  [<ffffffff8373f1ab>] ? preempt_count_sub+0xab/0x100
>  [<ffffffff83347315>] ? __percpu_counter_add+0x85/0xc0
>  [<ffffffff8316f759>] shrink_page_list+0x8f9/0xb90
>  [<ffffffff83170123>] shrink_inactive_list+0x253/0x510
>  [<ffffffff83170c93>] shrink_lruvec+0x563/0x6c0
>  [<ffffffff83170e2b>] shrink_zone+0x3b/0x100
>  [<ffffffff831710e1>] shrink_zones+0x1f1/0x3c0
>  [<ffffffff83171414>] try_to_free_pages+0x164/0x380
>  [<ffffffff83163e52>] __alloc_pages_nodemask+0x822/0xc90
>  [<ffffffff83169eb2>] ? pagevec_lru_move_fn+0x122/0x140
>  [<ffffffff831abeff>] alloc_pages_vma+0xaf/0x1c0
>  [<ffffffff8318a931>] handle_mm_fault+0xa31/0xc50
>  [<ffffffff831845c0>] ? follow_page_mask+0x1f0/0x320
>  [<ffffffff8318491b>] __get_user_pages+0x22b/0x660
>  [<ffffffff831b5093>] ? kmem_cache_alloc+0x183/0x210
>  [<ffffffff8318ce7e>] __mlock_vma_pages_range+0x9e/0xd0
>  [<ffffffff8318d6ba>] __mm_populate+0xca/0x180
>  [<ffffffff83179033>] vm_mmap_pgoff+0xd3/0xe0
>  [<ffffffff8318fbd6>] SyS_mmap_pgoff+0x116/0x2c0
>  [<ffffffff83011ced>] ? syscall_trace_enter+0x14d/0x2a0
>  [<ffffffff830084c2>] SyS_mmap+0x22/0x30
>  [<ffffffff837436ef>] tracesys+0xdd/0xe2
> 
> 
>  970         if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
>  971                         PF_MEMALLOC))

What were you running at the time? The XFS warning is there to
indicate that memory reclaim is doing something it shouldn't (i.e.
dirty page writeback from direct reclaim), so this is one for the mm
folk to work out...

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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