Re: [f2fs-dev] [PATCH v3 1/5] f2fs: compress: add compress_inode to cache compressed blocks

From: Chao Yu
Date: Sat Jan 16 2021 - 07:08:01 EST

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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);

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@xxxxxxxxxx>

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
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

.

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