Hi Kassey,
I sent a patch to solve potential deadlock, but not sure it can fix your
problem, could you try that patch?
[PATCH] f2fs: submit cached bio to avoid endless PageWriteback
On 2018/9/11 11:03, Kassey wrote:
> hi, Jaegeuk:
>
> we got some easy reproduced issue when doing reboot test.
> that the android init is sleep on a page to be writebback.
> from the ftrace we can confirm wb_workfn got running each 5s.
> but init has stuck for quite long time because below page can not
> be writeback done.
>
> by check the page's member(a_ops) , we can see that is f2fs page
> and private is NULL.
>
> can you help to give some suggest ?
>
>
> crash> kmem 0xFFFFFFBF01B6C840
>
> PAGE PHYSICAL MAPPING INDEX CNT FLAGS
>
> ffffffbf01b6c840 6db21000 ffffffc0964d1bc0 5c 2 1292c
> referenced,uptodate,lru,owner_priv_1,private,writeback,mappedtodisk
>
> crash> struct page 0xFFFFFFBF01B6C840
> struct page {
> flags = 76076,
> {
> mapping = 0xffffffc0964d1bc0,
> s_mem = 0xffffffc0964d1bc0,
> compound_mapcount = {
> counter = -1773331520
> }
> },
> {
> index = 92,
> freelist = 0x5c
> },
> {
> counters = 12884901887,
> {
> {
> _mapcount = {
> counter = -1
> },
> active = 4294967295,
> {
> inuse = 65535,
> objects = 32767,
> frozen = 1
> },
> units = -1
> },
> _refcount = {
> counter = 2
> }
> }
> },
> {
> lru = {
> next = 0xffffffbf02bd9520,
> prev = 0xffffffbf01b66960
> },
> pgmap = 0xffffffbf02bd9520,
> {
> next = 0xffffffbf02bd9520,
> pages = 28731744,
> pobjects = -65
> },
> callback_head = {
> next = 0xffffffbf02bd9520,
> func = 0xffffffbf01b66960
> },
> {
> compound_head = 18446743794582656288,
> compound_dtor = 28731744,
> compound_order = 4294967231
> }
> },
> {
> private = 0,
> ptl = 0x0,
> slab_cache = 0x0
> }
> }
>
>
> init:
>
>
> -000|__switch_to()
>
> -001|__schedule()
>
> -002|need_resched(inline)
>
> -002|schedule()
>
> -003|schedule_timeout()
>
> -004|get_current(inline)
>
> -004|io_schedule_timeout()
>
> -005|bit_wait_io()
>
> -006|__wait_on_bit()
>
> -007|wait_on_page_bit()
>
> -008|PageWriteback(inline)
>
> -008|wait_on_page_writeback(inline)
>
> -008|__filemap_fdatawait_range()
>
> -009|filemap_fdatawait_keep_errors()
>
> -010|sync_inodes_sb()
>
> -011|__sync_filesystem(inline)
>
> -011|sync_filesystem()
>
> -012|generic_shutdown_super()
>
> -013|kill_block_super()
>
> -014|kill_f2fs_super()
>
> -015|deactivate_locked_super()
>
> -016|deactivate_super()
>
> -017|mnt_free_id(inline)
>
> -017|cleanup_mnt()
>
> -018|__cleanup_mnt()
>
> -019|task_work_run()
>
> -020|do_notify_resume()
>
> -021|work_pending(asm)
>
> -->|exception
>
> -022|NUX:0x539E58(asm)
>
> ---|end of frame
>
>
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