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From: Chao Yu <chao@kernel.org>
To: Jaegeuk Kim <jaegeuk@kernel.org>,
	linux-kernel@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 4/5] f2fs: sanity check for total valid blocks
Date: Wed, 25 Apr 2018 21:03:30 +0800	[thread overview]
Message-ID: <e9ccab38-0773-156f-67b1-0374b0aeb6ed@kernel.org> (raw)
In-Reply-To: <20180425054613.2700-4-jaegeuk@kernel.org>

Hi Jaegeuk,

This patch makes generic/008 failed, because for fallocate case, total valid
block count can not be calculated by gathering valid_blocks of all sit entries.

Thanks,

On 2018/4/25 13:46, Jaegeuk Kim wrote:
> This patch enhances sanity check for SIT entries.
> 
> syzbot hit the following crash on upstream commit
> 83beed7b2b26f232d782127792dd0cd4362fdc41 (Fri Apr 20 17:56:32 2018 +0000)
> Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal
> syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=bf9253040425feb155ad
> 
> syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5692130282438656
> Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5095924598571008
> Kernel config: https://syzkaller.appspot.com/x/.config?id=1808800213120130118
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+bf9253040425feb155ad@syzkaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for details.
> If you forward the report, please keep this part and the footer.
> 
> F2FS-fs (loop0): invalid crc value
> F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
> F2FS-fs (loop0): Mounted with checkpoint version = d
> F2FS-fs (loop0): Bitmap was wrongly cleared, blk:9740
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/segment.c:1884!
> invalid opcode: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Modules linked in:
> CPU: 1 PID: 4508 Comm: syz-executor0 Not tainted 4.17.0-rc1+ #10
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:update_sit_entry+0x1215/0x1590 fs/f2fs/segment.c:1882
> RSP: 0018:ffff8801af526708 EFLAGS: 00010282
> RAX: ffffed0035ea4cc0 RBX: ffff8801ad454f90 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff82eeb87e RDI: ffffed0035ea4cb6
> RBP: ffff8801af526760 R08: ffff8801ad4a2480 R09: ffffed003b5e4f90
> R10: ffffed003b5e4f90 R11: ffff8801daf27c87 R12: ffff8801adb8d380
> R13: 0000000000000001 R14: 0000000000000008 R15: 00000000ffffffff
> FS:  00000000014af940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f06bc223000 CR3: 00000001adb02000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  allocate_data_block+0x66f/0x2050 fs/f2fs/segment.c:2663
>  do_write_page+0x105/0x1b0 fs/f2fs/segment.c:2727
>  write_node_page+0x129/0x350 fs/f2fs/segment.c:2770
>  __write_node_page+0x7da/0x1370 fs/f2fs/node.c:1398
>  sync_node_pages+0x18cf/0x1eb0 fs/f2fs/node.c:1652
>  block_operations+0x429/0xa60 fs/f2fs/checkpoint.c:1088
>  write_checkpoint+0x3ba/0x5380 fs/f2fs/checkpoint.c:1405
>  f2fs_sync_fs+0x2fb/0x6a0 fs/f2fs/super.c:1077
>  __sync_filesystem fs/sync.c:39 [inline]
>  sync_filesystem+0x265/0x310 fs/sync.c:67
>  generic_shutdown_super+0xd7/0x520 fs/super.c:429
>  kill_block_super+0xa4/0x100 fs/super.c:1191
>  kill_f2fs_super+0x9f/0xd0 fs/f2fs/super.c:3030
>  deactivate_locked_super+0x97/0x100 fs/super.c:316
>  deactivate_super+0x188/0x1b0 fs/super.c:347
>  cleanup_mnt+0xbf/0x160 fs/namespace.c:1174
>  __cleanup_mnt+0x16/0x20 fs/namespace.c:1181
>  task_work_run+0x1e4/0x290 kernel/task_work.c:113
>  tracehook_notify_resume include/linux/tracehook.h:191 [inline]
>  exit_to_usermode_loop+0x2bd/0x310 arch/x86/entry/common.c:166
>  prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
>  syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
>  do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x457d97
> RSP: 002b:00007ffd46f9c8e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000457d97
> RDX: 00000000014b09a3 RSI: 0000000000000002 RDI: 00007ffd46f9da50
> RBP: 00007ffd46f9da50 R08: 0000000000000000 R09: 0000000000000009
> R10: 0000000000000005 R11: 0000000000000246 R12: 00000000014b0940
> R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000658e
> RIP: update_sit_entry+0x1215/0x1590 fs/f2fs/segment.c:1882 RSP: ffff8801af526708
> ---[ end trace f498328bb02610a2 ]---
> 
> Reported-and-tested-by: syzbot+bf9253040425feb155ad@syzkaller.appspotmail.com
> Reported-and-tested-by: syzbot+7d6d31d3bc702f566ce3@syzkaller.appspotmail.com
> Reported-and-tested-by: syzbot+0a725420475916460f12@syzkaller.appspotmail.com
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>  fs/f2fs/segment.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 20250b88bf51..a55647f61232 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3612,6 +3612,7 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)
>  	unsigned int i, start, end;
>  	unsigned int readed, start_blk = 0;
>  	int err = 0;
> +	block_t total_valid_blocks = 0;
>  
>  	do {
>  		readed = ra_meta_pages(sbi, start_blk, BIO_MAX_PAGES,
> @@ -3634,6 +3635,7 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)
>  			if (err)
>  				return err;
>  			seg_info_from_raw_sit(se, &sit);
> +			total_valid_blocks += se->valid_blocks;
>  
>  			/* build discard map only one time */
>  			if (f2fs_discard_en(sbi)) {
> @@ -3675,11 +3677,13 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)
>  		sit = sit_in_journal(journal, i);
>  
>  		old_valid_blocks = se->valid_blocks;
> +		total_valid_blocks -= old_valid_blocks;
>  
>  		err = check_block_count(sbi, start, &sit);
>  		if (err)
>  			break;
>  		seg_info_from_raw_sit(se, &sit);
> +		total_valid_blocks += se->valid_blocks;
>  
>  		if (f2fs_discard_en(sbi)) {
>  			if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
> @@ -3698,6 +3702,15 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)
>  				se->valid_blocks - old_valid_blocks;
>  	}
>  	up_read(&curseg->journal_rwsem);
> +
> +	if (!err && total_valid_blocks != valid_user_blocks(sbi)) {
> +		f2fs_msg(sbi->sb, KERN_ERR,
> +			"SIT is corrupted %u vs %u",
> +			total_valid_blocks, valid_user_blocks(sbi));
> +		set_sbi_flag(sbi, SBI_NEED_FSCK);
> +		err = -EINVAL;
> +	}
> +
>  	return err;
>  }
>  
> 

  reply	other threads:[~2018-04-25 13:03 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25  5:46 [PATCH 1/5] f2fs: give message and set need_fsck given broken node id Jaegeuk Kim
2018-04-25  5:46 ` [PATCH 2/5] f2fs: avoid bug_on on corrupted inode Jaegeuk Kim
2018-04-25 13:01   ` [f2fs-dev] " Chao Yu
2018-04-25  5:46 ` [PATCH 3/5] f2fs: sanity check on sit entry Jaegeuk Kim
2018-04-25 13:02   ` [f2fs-dev] " Chao Yu
2018-04-25  5:46 ` [PATCH 4/5] f2fs: sanity check for total valid blocks Jaegeuk Kim
2018-04-25 13:03   ` Chao Yu [this message]
2018-04-26 15:27     ` [f2fs-dev] " Jaegeuk Kim
2018-04-26 15:29     ` [f2fs-dev] [PATCH 4/5 v2] " Jaegeuk Kim
2018-04-27  1:52       ` Chao Yu
2018-04-25  5:46 ` [PATCH 5/5] f2fs: enforce fsync_mode=strict for renamed directory Jaegeuk Kim
2018-04-25 13:04   ` [f2fs-dev] " Chao Yu
2018-04-26 15:32     ` Jaegeuk Kim
2018-04-27  1:41       ` Chao Yu
2018-04-25 12:57 ` [f2fs-dev] [PATCH 1/5] f2fs: give message and set need_fsck given broken node id Chao Yu
2018-04-26 15:25   ` Jaegeuk Kim

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