> On 2020/6/18 10:39, Zac wrote: > > > >> On 2020/6/17 17:04, zhaowu...@wingtech.com wrote: > >>> From: Wuyun Zhao <zhaowu...@wingtech.com> > >>> > >>> Under some condition, the __write_node_page will submit a page which > is > >> not > >>> f2fs_in_warm_node_list and will not call f2fs_add_fsync_node_entry. > >>> f2fs_gc continue to run to invoke f2fs_iget -> do_read_inode to read the > >> same node page > >>> and set code node, which make f2fs_in_warm_node_list become true, > >>> that will cause f2fs_bug_on in f2fs_del_fsync_node_entry when > >> f2fs_write_end_io called. > >> Could you please add below race condition description into commit > >> message? > >> > >> - f2fs_write_end_io > >> - f2fs_iget > >> - do_read_inode > >> - set_cold_node > >> recover cold node flag > >> - f2fs_in_warm_node_list > >> - is_cold_node > >> if node is cold, assume we have added > >> node to fsync_node_list during writepages() > >> - f2fs_del_fsync_node_entry > >> - f2fs_bug_on() due to node page > >> is not in fsync_node_list > > > > Ok, will add the commit message. > > > >> BTW, I'm curious about why we can lose cold flag for non-dir inode? > >> any clue to reproduce this bug (I mean losing cold flag)? > > > > it's a f2fs image with 25600MB > > flash this image to device > > the device will resize it according to the userdata partition size which is > > about 94GB > > the device mount the f2fs partition > > then hit this f2fs_bug_on > > > > seems that the cold flag is not been set when mkfs > > Ah, I guess both mkfs/sload ignores setting cold node flag for non-dir inode, > could you please send another patch to fix this issue?
Patch v2 has been sent. > > > > I think the issue is that > > > > 1. the node page in the storage is without cold bit > > 2. f2fs_disable_checkpoint -> f2fs_gc -> f2fs_get_node_page, this page > won't > > be set cold flag > > 3. f2fs_move_node_page -> __write_node_page to write this page > > 4. f2fs_gc -> f2fs_iget -> do_read_inode to read this page and set cold flag > > Clear enough, thanks for your explanation. :) > > Thanks, > > > > >>> > >>> [ 34.966133] Call trace: > >>> [ 34.969902] f2fs_del_fsync_node_entry+0x100/0x108 > >>> [ 34.976071] f2fs_write_end_io+0x1e0/0x288 > >>> [ 34.981539] bio_endio+0x248/0x270 > >>> [ 34.986289] blk_update_request+0x2b0/0x4d8 > >>> [ 34.991841] scsi_end_request+0x40/0x440 > >>> [ 34.997126] scsi_io_completion+0xa4/0x748 > >>> [ 35.002593] scsi_finish_command+0xdc/0x110 > >>> [ 35.008143] scsi_softirq_done+0x118/0x150 > >>> [ 35.013610] blk_done_softirq+0x8c/0xe8 > >>> [ 35.018811] __do_softirq+0x2e8/0x578 > >>> [ 35.023828] irq_exit+0xfc/0x120 > >>> [ 35.028398] handle_IPI+0x1d8/0x330 > >>> [ 35.033233] gic_handle_irq+0x110/0x1d4 > >>> [ 35.038433] el1_irq+0xb4/0x130 > >>> [ 35.042917] kmem_cache_alloc+0x3f0/0x418 > >>> [ 35.048288] radix_tree_node_alloc+0x50/0xf8 > >>> [ 35.053933] __radix_tree_create+0xf8/0x188 > >>> [ 35.059484] __radix_tree_insert+0x3c/0x128 > >>> [ 35.065035] add_gc_inode+0x90/0x118 > >>> [ 35.069967] f2fs_gc+0x1b80/0x2d70 > >>> [ 35.074718] f2fs_disable_checkpoint+0x94/0x1d0 > >>> [ 35.080621] f2fs_fill_super+0x10c4/0x1b88 > >>> [ 35.086088] mount_bdev+0x194/0x1e0 > >>> [ 35.090923] f2fs_mount+0x40/0x50 > >>> [ 35.095589] mount_fs+0xb4/0x190 > >>> [ 35.100159] vfs_kern_mount+0x80/0x1d8 > >>> [ 35.105260] do_mount+0x478/0xf18 > >>> [ 35.109926] ksys_mount+0x90/0xd0 > >>> [ 35.114592] __arm64_sys_mount+0x24/0x38 > >>> > >>> Signed-off-by: Wuyun Zhao <zhaowu...@wingtech.com> > >> > >> Reviewed-by: Chao Yu <yuch...@huawei.com> > >> > >> Thanks, > >> > >>> --- > >>> fs/f2fs/inode.c | 1 + > >>> 1 file changed, 1 insertion(+) > >>> > >>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > >>> index be6ac33..0df5c8c 100644 > >>> --- a/fs/f2fs/inode.c > >>> +++ b/fs/f2fs/inode.c > >>> @@ -402,6 +402,7 @@ static int do_read_inode(struct inode *inode) > >>> > >>> /* try to recover cold bit for non-dir inode */ > >>> if (!S_ISDIR(inode->i_mode) && !is_cold_node(node_page)) { > >>> + f2fs_wait_on_page_writeback(node_page, NODE, true, true); > >>> set_cold_node(node_page, false); > >>> set_page_dirty(node_page); > >>> } > >>> > > > > . > > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel