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
--
Best regards
Kassey
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