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Date: Fri, 22 Jan 2021 10:17:22 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC: <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v3 1/5] f2fs: compress: add compress_inode to
cache compressed blocks
On 2021/1/20 5:42, Jaegeuk Kim wrote:
> On 01/16, Chao Yu wrote:
>> On 2021/1/15 22:59, Jaegeuk Kim wrote:
>>> On 01/15, Chao Yu wrote:
>>>> 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.
>>>
>>> It's fs/f2fs/data.c:2203
>>>
>>> 2199 goto out_put_dnode;
>>> 2200 }
>>> 2201
>>> 2202 for (i = 0; i < dic->nr_cpages; i++) {
>>
>> I doubt when i == cc->nr_cpages, dic was released in below condition,
>> then dic->nr_cpages can be any value (may be larger than cc->nr_cpages),
>> then we may continue the loop, and will access invalid pointer dic.
>>
>> if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
>> if (atomic_dec_and_test(&dic->remaining_pages))
>> f2fs_decompress_cluster(dic);
>> continue;
>> }
>>
>>
>> I'd like to add a condition here (in between line 2202 and line 2203) to
>> make sure whether this can happen, could you please help to verify this?
>>
>> f2fs_bug_on(sbi, i >= cc->nr_cpages);
>
> No, it seems this is not the case.
Oops, could you please help to remove all below codes and do the test again
to check whether they are the buggy codes? as I doubt there is use-after-free
bug.
if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
if (atomic_dec_and_test(&dic->remaining_pages))
f2fs_decompress_cluster(dic);
continue;
}
Before that, please merge last fixing patch as below:
https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?h=dev&id=2371a9b8131712276458f1991a6ae394ef6c6c90
Thanks,
>
>>
>> Thanks,
>>
>>> 2203 struct page *page = dic->cpages[i];
>>> 2204 block_t blkaddr;
>>> 2205 struct bio_post_read_ctx *ctx;
>>> 2206
>>> 2207 blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>> 2208 dn.ofs_in_node + i + 1);
>>>
>>>
>>>>
>>>> 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@...wei.com>
>>>>>>
>>>>>> Signed-off-by: Chao Yu <yuchao0@...wei.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
>>>>> .
>>>>>
>>>
>>>
>>> _______________________________________________
>>> Linux-f2fs-devel mailing list
>>> Linux-f2fs-devel@...ts.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>
> .
>
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