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https://github.com/torvalds/linux
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1601839e9e
We will encounter deadloop in below scenario:
1. increase page count for F2FS_DIRTY_META type in following path:
->recover_fsync_data
->recover_data
->do_recover_data
->recover_data_page
->change_curseg
->write_sum_page
->set_page_dirty
2. fail in recover_data()
3. invalidate meta pages in truncate_inode_pages_final without decreasing page
count.
4. deadloop when sync_meta_pages as page count will always be non-zero.
message:
NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
[<c1129a37>] pagevec_lookup_tag+0x27/0x30
[<f0e774c7>] sync_meta_pages+0x87/0x160 [f2fs]
[<f0e86dd9>] recover_fsync_data+0xeb9/0xf10 [f2fs]
[<f0e75398>] f2fs_fill_super+0x888/0x980 [f2fs]
[<c11733ca>] mount_bdev+0x16a/0x1a0
[<f0e7180f>] f2fs_mount+0x1f/0x30 [f2fs]
[<c1173da6>] mount_fs+0x36/0x170
[<c118b6f5>] vfs_kern_mount+0x55/0xe0
[<c118d63f>] do_mount+0x1df/0x9f0
[<c118e110>] SyS_mount+0x70/0xb0
[<c15a0c48>] sysenter_do_call+0x12/0x12
To avoid page count leak, let's add ->invalidatepage and ->releasepage in
f2fs_meta_aops as f2fs_node_aops to release meta page count correctly.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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|---|---|---|
| .. | ||
| acl.c | ||
| acl.h | ||
| checkpoint.c | ||
| data.c | ||
| debug.c | ||
| dir.c | ||
| f2fs.h | ||
| file.c | ||
| gc.c | ||
| gc.h | ||
| hash.c | ||
| inline.c | ||
| inode.c | ||
| Kconfig | ||
| Makefile | ||
| namei.c | ||
| node.c | ||
| node.h | ||
| recovery.c | ||
| segment.c | ||
| segment.h | ||
| super.c | ||
| trace.c | ||
| trace.h | ||
| xattr.c | ||
| xattr.h | ||