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Subject: Re: [f2fs-dev] [PATCH v3 1/5] f2fs: compress: add compress_inode to
 cache compressed blocks
To:     Jaegeuk Kim <jaegeuk@kernel.org>
CC:     <linux-kernel@vger.kernel.org>,
        <linux-f2fs-devel@lists.sourceforge.net>
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From:   Chao Yu <yuchao0@huawei.com>
Message-ID: <8e88b1e2-0176-9487-b925-9c7a31a7e5cd@huawei.com>
Date:   Fri, 15 Jan 2021 17:32:59 +0800
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On 2021/1/14 12:06, Jaegeuk Kim wrote:
> On 01/14, Chao Yu wrote:
>> On 2021/1/13 23:41, Jaegeuk Kim wrote:
>>> [58690.961685] F2FS-fs (vdb) : inject page get in f2fs_pagecache_get_page of f2fs_quota_write+0x150/0x1f0 [f2fs]
>>> [58691.071481] F2FS-fs (vdb): Inconsistent error blkaddr:31058, sit bitmap:0
>>> [58691.077338] ------------[ cut here ]------------
>>> [58691.081461] WARNING: CPU: 5 PID: 8308 at fs/f2fs/checkpoint.c:151 f2fs_is_valid_blkaddr+0x1e9/0x280 [f2fs]
>>> [58691.086734] Modules linked in: f2fs(O) quota_v2 quota_tree dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua ppdev intel_rapl_msr intel_rapl_common sb_edac kvm_intel kvm irqbypass joydev parport_pc parport input_leds serio_raw mac_hid qemu_fw_cfg sch_fq_codel ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy asy
>>> [58691.120632] CPU: 5 PID: 8308 Comm: kworker/u17:5 Tainted: G      D    O      5.11.0-rc3-custom #1
>>> [58691.125438] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014
>>> [58691.129625] Workqueue: f2fs_post_read_wq f2fs_post_read_work [f2fs]
>>> [58691.133142] RIP: 0010:f2fs_is_valid_blkaddr+0x1e9/0x280 [f2fs]
>>> [58691.136221] Code: 3c 07 b8 01 00 00 00 d3 e0 21 f8 75 57 83 fa 07 75 52 89 f2 31 c9 48 c7 c6 20 6a a7 c0 48 89 df e8 bc d6 03 00 f0 80 4b 48 04 <0f> 0b 31 c0 e9 5e fe ff ff 48 8b 57 10 8b 42 30 d3 e0 03 42 48 39
>>> [58691.143142] RSP: 0018:ffffb429047afd40 EFLAGS: 00010206
>>> [58691.145639] RAX: 0000000000000000 RBX: ffff9c3b84041000 RCX: 0000000000000000
>>> [58691.148899] RDX: 0000000000000000 RSI: ffff9c3bbbd58940 RDI: ffff9c3bbbd58940
>>> [58691.152130] RBP: ffffb429047afd48 R08: ffff9c3bbbd58940 R09: ffffb429047afaa8
>>> [58691.155266] R10: 00000000001ba090 R11: 0000000000000003 R12: 0000000000007952
>>> [58691.158304] R13: fffff5cc81266ac0 R14: 00000000000000db R15: 0000000000000000
>>> [58691.161160] FS:  0000000000000000(0000) GS:ffff9c3bbbd40000(0000) knlGS:0000000000000000
>>> [58691.164286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [58691.166869] CR2: 00007f0fee9d3000 CR3: 000000005ee76001 CR4: 0000000000370ee0
>>> [58691.169714] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>> [58691.173102] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>> [58691.176163] Call Trace:
>>> [58691.177948]  f2fs_cache_compressed_page+0x69/0x280 [f2fs]
>>> [58691.180549]  ? newidle_balance+0x253/0x3d0
>>> [58691.183238]  f2fs_end_read_compressed_page+0x5a/0x70 [f2fs]
>>> [58691.188205]  f2fs_post_read_work+0x11d/0x120 [f2fs]
>>> [58691.192489]  process_one_work+0x221/0x3a0
>>> [58691.194482]  worker_thread+0x4d/0x3f0
>>> [58691.198867]  kthread+0x114/0x150
>>> [58691.202243]  ? process_one_work+0x3a0/0x3a0
>>> [58691.205367]  ? kthread_park+0x90/0x90
>>> [58691.208244]  ret_from_fork+0x22/0x30
>>
>> Below patch fixes two issues, I expect this can fix above warning at least.
> 
> [106115.591837] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b73: 0000 [#1] SMP PTI
> [106115.595584] CPU: 3 PID: 10109 Comm: fsstress Tainted: G           O      5.11.0-rc3-custom #1
> [106115.601087] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014
> [106115.601087] RIP: 0010:f2fs_read_multi_pages+0x415/0xa70 [f2fs]

Jaegeuk,

Could you please help to run:

gdb f2fs.ko
(gdb) l *(f2fs_read_multi_pages+0x415)

to see where we hit the panic.

Thanks,

> [106115.601087] Code: ff ff ff 45 31 ff f7 d0 25 00 00 08 00 89 45 80 48 8b 45 a0 48 83 c0 6c 48 89 85 78 ff ff ff 48 8b 7d a0 49 63 c7 48 8b 57 30 <48> 8b 1c c2 8b 45 c4 8d 50 01 48 8b 45 b8 48 2b 05 c6 55 92 dc 48
> [106115.601087] RSP: 0018:ffffc0a4822f7710 EFLAGS: 00010206
> [106115.620978] RAX: 0000000000000001 RBX: ffffe801820034c0 RCX: 0000000000200000
> [106115.620978] RDX: 6b6b6b6b6b6b6b6b RSI: ffffffffc09487af RDI: ffff9bc1d87c4200
> [106115.627351] RBP: ffffc0a4822f77c0 R08: 0000000000000000 R09: 0000000000000000
> [106115.627351] R10: ffff9bc1d87c4200 R11: 0000000000000001 R12: 0000000000105343
> [106115.627351] R13: ffff9bc2d2184000 R14: 0000000000000000 R15: 0000000000000001
> [106115.635587] FS:  00007f188e909b80(0000) GS:ffff9bc2fbcc0000(0000) knlGS:0000000000000000
> [106115.635587] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [106115.635587] CR2: 000056446d88b358 CR3: 00000000534b4002 CR4: 0000000000370ee0
> [106115.635587] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [106115.635587] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [106115.635587] Call Trace:
> [106115.635587]  f2fs_mpage_readpages+0x4e4/0xac0 [f2fs]
> [106115.635587]  f2fs_readahead+0x47/0x90 [f2fs]
> [106115.635587]  read_pages+0x8e/0x280
> [106115.635587]  page_cache_ra_unbounded+0x11f/0x1f0
> [106115.665909]  do_page_cache_ra+0x3d/0x40
> [106115.670756]  ondemand_readahead+0x2c1/0x2e0
> [106115.671682]  page_cache_sync_ra+0xd4/0xe0
> [106115.675622]  generic_file_buffered_read_get_pages+0x126/0x8d0
> [106115.679158]  generic_file_buffered_read+0x113/0x4a0
> [106115.679158]  ? __filemap_fdatawrite_range+0xd8/0x110
> [106115.685672]  ? __mark_inode_dirty+0x98/0x330
> [106115.691168]  ? f2fs_direct_IO+0x80/0x6f0 [f2fs]
> [106115.691168]  generic_file_read_iter+0xdf/0x140
> [106115.691168]  f2fs_file_read_iter+0x34/0xb0 [f2fs]
> [106115.699450]  aio_read+0xef/0x1b0
> [106115.699450]  ? do_user_addr_fault+0x1b8/0x450
> [106115.699450]  io_submit_one+0x217/0xbc0
> [106115.699450]  ? io_submit_one+0x217/0xbc0
> [106115.699450]  __x64_sys_io_submit+0x8d/0x180
> [106115.699450]  ? __x64_sys_io_submit+0x8d/0x180
> [106115.712018]  ? exit_to_user_mode_prepare+0x3d/0x1a0
> [106115.717468]  do_syscall_64+0x38/0x90
> [106115.723157]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> 
>>
>> - detect truncation during f2fs_cache_compressed_page()
>> - don't set PageUptodate for temporary page in f2fs_load_compressed_page()
>>
>> From: Chao Yu <yuchao0@huawei.com>
>>
>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>> ---
>>   fs/f2fs/compress.c | 20 +++++++++++++-------
>>   fs/f2fs/data.c     |  3 +--
>>   fs/f2fs/f2fs.h     |  6 +++---
>>   3 files changed, 17 insertions(+), 12 deletions(-)
>>
>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>> index 0fec71e40001..f364c10c506c 100644
>> --- a/fs/f2fs/compress.c
>> +++ b/fs/f2fs/compress.c
>> @@ -1741,7 +1741,7 @@ void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   	if (!test_opt(sbi, COMPRESS_CACHE))
>>   		return;
>>
>> -	if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE))
>> +	if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
>>   		return;
>>
>>   	si_meminfo(&si);
>> @@ -1774,21 +1774,25 @@ void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   		return;
>>   	}
>>
>> -	memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
>> -	SetPageUptodate(cpage);
>> -
>>   	f2fs_set_page_private(cpage, ino);
>>
>> +	if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
>> +		goto out;
>> +
>> +	memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
>> +	SetPageUptodate(cpage);
>> +out:
>>   	f2fs_put_page(cpage, 1);
>>   }
>>
>> -void f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>> +bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   								block_t blkaddr)
>>   {
>>   	struct page *cpage;
>> +	bool hitted = false;
>>
>>   	if (!test_opt(sbi, COMPRESS_CACHE))
>> -		return;
>> +		return false;
>>
>>   	cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
>>   				blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
>> @@ -1797,10 +1801,12 @@ void f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   			atomic_inc(&sbi->compress_page_hit);
>>   			memcpy(page_address(page),
>>   				page_address(cpage), PAGE_SIZE);
>> -			SetPageUptodate(page);
>> +			hitted = true;
>>   		}
>>   		f2fs_put_page(cpage, 1);
>>   	}
>> +
>> +	return hitted;
>>   }
>>
>>   void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index b3973494b102..3705c272b76a 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -2211,8 +2211,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>   		blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>   						dn.ofs_in_node + i + 1);
>>
>> -		f2fs_load_compressed_page(sbi, page, blkaddr);
>> -		if (PageUptodate(page)) {
>> +		if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
>>   			if (atomic_dec_and_test(&dic->remaining_pages))
>>   				f2fs_decompress_cluster(dic);
>>   			continue;
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 9f79a6825f06..b807970d67b1 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -3951,7 +3951,7 @@ struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi);
>>   void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr);
>>   void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   						nid_t ino, block_t blkaddr);
>> -void f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>> +bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>   								block_t blkaddr);
>>   void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino);
>>   #else
>> @@ -3990,8 +3990,8 @@ static inline void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi,
>>   				block_t blkaddr) { }
>>   static inline void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
>>   				struct page *page, nid_t ino, block_t blkaddr) { }
>> -static inline void f2fs_load_compressed_page(struct f2fs_sb_info *sbi,
>> -				struct page *page, block_t blkaddr) { }
>> +static inline bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi,
>> +				struct page *page, block_t blkaddr) { return false; }
>>   static inline void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi,
>>   							nid_t ino) { }
>>   #endif
>> -- 
>> 2.29.2
> .
>