linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: add bug_on when f2fs

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Date:   Mon, 16 Oct 2017 11:25:58 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Yunlong Song <yunlong.song@...wei.com>, Chao Yu <chao@...nel.org>,
        <jaegeuk@...nel.org>, <yunlong.song@...oud.com>
CC:     <linux-fsdevel@...r.kernel.org>, <miaoxie@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: add bug_on when f2fs_gc even fails to
 get one victim

On 2017/10/14 20:34, Yunlong Song wrote:
> Do you mean check out-of-space test? I have tried that but no bugon.

Yes, test recent f2fs codes with kernel 4.13.0-rc1+ in VM, FYI:

kernel BUG at gc.c:1034!
invalid opcode: 0000 [#1] SMP
Hardware name: Xen HVM domU, BIOS 4.1.2_115-900.260_ 11/06/2015
RIP: 0010:f2fs_gc+0x6e5/0x6f0 [f2fs]
RSP: 0018:ffffc90004af7b40 EFLAGS: 00010202
RAX: ffff8801b0a15940 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8801b0a15940 RSI: ffff8801978d5f00 RDI: ffff880128148048
RBP: ffffc90004af7c38 R08: ffff8801978d5f00 R09: 0000000000000003
R10: 0000000000000003 R11: ffff8800060703a0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8801b4279800
FS:  00007f23493cb740(0000) GS:ffff880216f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd05402ff8 CR3: 00000001bffb3000 CR4: 00000000001406e0
Call Trace:
 f2fs_balance_fs+0x123/0x140 [f2fs]
 f2fs_create+0x130/0x240 [f2fs]
 path_openat+0xee7/0x1360
 do_filp_open+0x7e/0xd0
 do_sys_open+0x115/0x1f0
 SyS_open+0x1e/0x20
 do_syscall_64+0x6e/0x160
 entry_SYSCALL64_slow_path+0x25/0x25

Thanks,

> 
> On 2017/10/14 8:17, Chao Yu wrote:
>> On 2017/10/13 21:31, Yunlong Song wrote:
>>> This can help us to debug on some corner case.
>> I can hit this bugon with generic/015 of fstest easily, could have a look at
>> this?
>>
>> Thanks,
>>
>>> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
>>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>>> ---
>>>   fs/f2fs/gc.c | 6 +++++-
>>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>> index 197ebf4..2b03202 100644
>>> --- a/fs/f2fs/gc.c
>>> +++ b/fs/f2fs/gc.c
>>> @@ -986,6 +986,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>>>   		.ilist = LIST_HEAD_INIT(gc_list.ilist),
>>>   		.iroot = RADIX_TREE_INIT(GFP_NOFS),
>>>   	};
>>> +	bool need_fggc = false;
>>>   
>>>   	trace_f2fs_gc_begin(sbi->sb, sync, background,
>>>   				get_pages(sbi, F2FS_DIRTY_NODES),
>>> @@ -1018,8 +1019,10 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>>>   			if (ret)
>>>   				goto stop;
>>>   		}
>>> -		if (has_not_enough_free_secs(sbi, 0, 0))
>>> +		if (has_not_enough_free_secs(sbi, 0, 0)) {
>>>   			gc_type = FG_GC;
>>> +			need_fggc = true;
>>> +		}
>>>   	}
>>>   
>>>   	/* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
>>> @@ -1028,6 +1031,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>>>   		goto stop;
>>>   	}
>>>   	if (!__get_victim(sbi, &segno, gc_type)) {
>>> +		f2fs_bug_on(sbi, !total_freed && need_fggc);
>>>   		ret = -ENODATA;
>>>   		goto stop;
>>>   	}
>>>
>> .
>>
>