[PATCH v4 1/2] zram/zcomp: use GFP_NOIO to allocate streams

From: Sergey Senozhatsky
Date: Tue Dec 01 2015 - 07:38:17 EST

We can end up allocating a new compression stream with GFP_KERNEL from
within the IO path, which may result is nested (recursive) IO operations.
That can introduce problems if the IO path in question is a reclaimer,
holding some locks that will deadlock nested IOs.

Allocate streams and working memory using GFP_NOIO flag, forbidding
recursive IO and FS operations.

An example:

[ 747.233722] inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
[ 747.233724] git/20158 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 747.233725] (jbd2_handle){+.+.?.}, at: [<ffffffff811e31db>] start_this_handle+0x4ca/0x555
[ 747.233733] {IN-RECLAIM_FS-W} state was registered at:
[ 747.233735] [<ffffffff8107b8e9>] __lock_acquire+0x8da/0x117b
[ 747.233738] [<ffffffff8107c950>] lock_acquire+0x10c/0x1a7
[ 747.233740] [<ffffffff811e323e>] start_this_handle+0x52d/0x555
[ 747.233742] [<ffffffff811e331a>] jbd2__journal_start+0xb4/0x237
[ 747.233744] [<ffffffff811cc6c7>] __ext4_journal_start_sb+0x108/0x17e
[ 747.233748] [<ffffffff811a90bf>] ext4_dirty_inode+0x32/0x61
[ 747.233750] [<ffffffff8115f37e>] __mark_inode_dirty+0x16b/0x60c
[ 747.233754] [<ffffffff81150ad6>] iput+0x11e/0x274
[ 747.233757] [<ffffffff8114bfbd>] __dentry_kill+0x148/0x1b8
[ 747.233759] [<ffffffff8114c9d9>] shrink_dentry_list+0x274/0x44a
[ 747.233761] [<ffffffff8114d38a>] prune_dcache_sb+0x4a/0x55
[ 747.233763] [<ffffffff8113b1ad>] super_cache_scan+0xfc/0x176
[ 747.233767] [<ffffffff810fa089>] shrink_slab.part.14.constprop.25+0x2a2/0x4d3
[ 747.233770] [<ffffffff810fcccb>] shrink_zone+0x74/0x140
[ 747.233772] [<ffffffff810fd924>] kswapd+0x6b7/0x930
[ 747.233774] [<ffffffff81058887>] kthread+0x107/0x10f
[ 747.233778] [<ffffffff814fadff>] ret_from_fork+0x3f/0x70
[ 747.233783] irq event stamp: 138297
[ 747.233784] hardirqs last enabled at (138297): [<ffffffff8107aff3>] debug_check_no_locks_freed+0x113/0x12f
[ 747.233786] hardirqs last disabled at (138296): [<ffffffff8107af13>] debug_check_no_locks_freed+0x33/0x12f
[ 747.233788] softirqs last enabled at (137818): [<ffffffff81040f89>] __do_softirq+0x2d3/0x3e9
[ 747.233792] softirqs last disabled at (137813): [<ffffffff81041292>] irq_exit+0x41/0x95
[ 747.233794]
other info that might help us debug this:
[ 747.233796] Possible unsafe locking scenario:
[ 747.233797] CPU0
[ 747.233798] ----
[ 747.233799] lock(jbd2_handle);
[ 747.233801] <Interrupt>
[ 747.233801] lock(jbd2_handle);
[ 747.233803]
*** DEADLOCK ***
[ 747.233805] 5 locks held by git/20158:
[ 747.233806] #0: (sb_writers#7){.+.+.+}, at: [<ffffffff81155411>] mnt_want_write+0x24/0x4b
[ 747.233811] #1: (&type->i_mutex_dir_key#2/1){+.+.+.}, at: [<ffffffff81145087>] lock_rename+0xd9/0xe3
[ 747.233817] #2: (&sb->s_type->i_mutex_key#11){+.+.+.}, at: [<ffffffff8114f8e2>] lock_two_nondirectories+0x3f/0x6b
[ 747.233822] #3: (&sb->s_type->i_mutex_key#11/4){+.+.+.}, at: [<ffffffff8114f909>] lock_two_nondirectories+0x66/0x6b
[ 747.233827] #4: (jbd2_handle){+.+.?.}, at: [<ffffffff811e31db>] start_this_handle+0x4ca/0x555
[ 747.233831]
stack backtrace:
[ 747.233834] CPU: 2 PID: 20158 Comm: git Not tainted 4.1.0-rc7-next-20150615-dbg-00016-g8bdf555-dirty #211
[ 747.233837] ffff8800a56cea40 ffff88010d0a75f8 ffffffff814f446d ffffffff81077036
[ 747.233840] ffffffff823a84b0 ffff88010d0a7638 ffffffff814f3849 0000000000000001
[ 747.233843] 000000000000000a ffff8800a56cf6f8 ffff8800a56cea40 ffffffff810795dd
[ 747.233846] Call Trace:
[ 747.233849] [<ffffffff814f446d>] dump_stack+0x4c/0x6e
[ 747.233852] [<ffffffff81077036>] ? up+0x39/0x3e
[ 747.233854] [<ffffffff814f3849>] print_usage_bug.part.23+0x25b/0x26a
[ 747.233857] [<ffffffff810795dd>] ? print_shortest_lock_dependencies+0x182/0x182
[ 747.233859] [<ffffffff8107a9c9>] mark_lock+0x384/0x56d
[ 747.233862] [<ffffffff8107ac11>] mark_held_locks+0x5f/0x76
[ 747.233865] [<ffffffffa023d2f3>] ? zcomp_strm_alloc+0x25/0x73 [zram]
[ 747.233867] [<ffffffff8107d13b>] lockdep_trace_alloc+0xb2/0xb5
[ 747.233870] [<ffffffff8112bac7>] kmem_cache_alloc_trace+0x32/0x1e2
[ 747.233873] [<ffffffffa023d2f3>] zcomp_strm_alloc+0x25/0x73 [zram]
[ 747.233876] [<ffffffffa023d428>] zcomp_strm_multi_find+0xe7/0x173 [zram]
[ 747.233879] [<ffffffffa023d58b>] zcomp_strm_find+0xc/0xe [zram]
[ 747.233881] [<ffffffffa023f292>] zram_bvec_rw+0x2ca/0x7e0 [zram]
[ 747.233885] [<ffffffffa023fa8c>] zram_make_request+0x1fa/0x301 [zram]
[ 747.233889] [<ffffffff812142f8>] generic_make_request+0x9c/0xdb
[ 747.233891] [<ffffffff8121442e>] submit_bio+0xf7/0x120
[ 747.233895] [<ffffffff810f1c0c>] ? __test_set_page_writeback+0x1a0/0x1b8
[ 747.233897] [<ffffffff811a9d00>] ext4_io_submit+0x2e/0x43
[ 747.233899] [<ffffffff811a9efa>] ext4_bio_write_page+0x1b7/0x300
[ 747.233902] [<ffffffff811a2106>] mpage_submit_page+0x60/0x77
[ 747.233905] [<ffffffff811a25b0>] mpage_map_and_submit_buffers+0x10f/0x21d
[ 747.233907] [<ffffffff811a6814>] ext4_writepages+0xc8c/0xe1b
[ 747.233910] [<ffffffff810f3f77>] do_writepages+0x23/0x2c
[ 747.233913] [<ffffffff810ea5d1>] __filemap_fdatawrite_range+0x84/0x8b
[ 747.233915] [<ffffffff810ea657>] filemap_flush+0x1c/0x1e
[ 747.233917] [<ffffffff811a3851>] ext4_alloc_da_blocks+0xb8/0x117
[ 747.233919] [<ffffffff811af52a>] ext4_rename+0x132/0x6dc
[ 747.233921] [<ffffffff8107ac11>] ? mark_held_locks+0x5f/0x76
[ 747.233924] [<ffffffff811afafd>] ext4_rename2+0x29/0x2b
[ 747.233926] [<ffffffff811427ea>] vfs_rename+0x540/0x636
[ 747.233928] [<ffffffff81146a01>] SyS_renameat2+0x359/0x44d
[ 747.233931] [<ffffffff81146b26>] SyS_rename+0x1e/0x20
[ 747.233933] [<ffffffff814faa17>] entry_SYSCALL_64_fastpath+0x12/0x6f

[minchan@xxxxxxxxxx: add stable mark]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Kyeongdon Kim <kyeongdon.kim@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
drivers/block/zram/zcomp.c | 4 ++--
drivers/block/zram/zcomp_lz4.c | 2 +-
drivers/block/zram/zcomp_lzo.c | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 5cb13ca..c536177 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -76,7 +76,7 @@ static void zcomp_strm_free(struct zcomp *comp, struct zcomp_strm *zstrm)
*/
static struct zcomp_strm *zcomp_strm_alloc(struct zcomp *comp)
{
- struct zcomp_strm *zstrm = kmalloc(sizeof(*zstrm), GFP_KERNEL);
+ struct zcomp_strm *zstrm = kmalloc(sizeof(*zstrm), GFP_NOIO);
if (!zstrm)
return NULL;

@@ -85,7 +85,7 @@ static struct zcomp_strm *zcomp_strm_alloc(struct zcomp *comp)
* allocate 2 pages. 1 for compressed data, plus 1 extra for the
* case when compressed size is larger than the original one
*/
- zstrm->buffer = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
+ zstrm->buffer = (void *)__get_free_pages(GFP_NOIO | __GFP_ZERO, 1);
if (!zstrm->private || !zstrm->buffer) {
zcomp_strm_free(comp, zstrm);
zstrm = NULL;
diff --git a/drivers/block/zram/zcomp_lz4.c b/drivers/block/zram/zcomp_lz4.c
index f2afb7e..ee44b51 100644
--- a/drivers/block/zram/zcomp_lz4.c
+++ b/drivers/block/zram/zcomp_lz4.c
@@ -15,7 +15,7 @@

static void *zcomp_lz4_create(void)
{
- return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
+ return kzalloc(LZ4_MEM_COMPRESS, GFP_NOIO);
}

static void zcomp_lz4_destroy(void *private)
diff --git a/drivers/block/zram/zcomp_lzo.c b/drivers/block/zram/zcomp_lzo.c
index da1bc47..683ce04 100644
--- a/drivers/block/zram/zcomp_lzo.c
+++ b/drivers/block/zram/zcomp_lzo.c
@@ -15,7 +15,7 @@

static void *lzo_create(void)
{
- return kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
+ return kzalloc(LZO1X_MEM_COMPRESS, GFP_NOIO);
}

static void lzo_destroy(void *private)
--
2.6.2

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