[PATCH REVIEW] udf: Fix lock inversion between iprune_mutex and alloc_mutex

[Jan Kara]

A memory allocation inside alloc_mutex must not recurse back
into the filesystem itself because that leads to lock inversion
between iprune_mutex and alloc_mutex (and thus to deadlocks - see
traces below). Make allocations inside alloc_mutex use GFP_NOFS
to avoid this problem.

tar           D ffff81015b9c8c90     0  6614   6612
 ffff8100d5a21a20 0000000000000086 0000000000000000 00000000ffff0000
 ffff81015b9c8c90 ffff81015b8f0cd0 ffff81015b9c8ee0 0000000000000000
 0000000000000003 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff803c1d8a>] __mutex_lock_slowpath+0x64/0x9b
 [<ffffffff803c1bef>] mutex_lock+0xa/0xb
 [<ffffffff8027f8c2>] shrink_icache_memory+0x38/0x200
 [<ffffffff80257742>] shrink_slab+0xe3/0x15b
 [<ffffffff802579db>] try_to_free_pages+0x221/0x30d
 [<ffffffff8025657e>] isolate_pages_global+0x0/0x31
 [<ffffffff8025324b>] __alloc_pages_internal+0x252/0x3ab
 [<ffffffff8026b08b>] cache_alloc_refill+0x22e/0x47b
 [<ffffffff8026ae37>] kmem_cache_alloc+0x3b/0x61
 [<ffffffff8026b15b>] cache_alloc_refill+0x2fe/0x47b
 [<ffffffff8026b34e>] __kmalloc+0x76/0x9c
 [<ffffffffa00751f2>] :udf:udf_new_inode+0x202/0x2e2
 [<ffffffffa007ae5e>] :udf:udf_create+0x2f/0x16d
 [<ffffffffa0078f27>] :udf:udf_lookup+0xa6/0xad
...
kswapd0       D ffff81015b9d9270     0   125      2
 ffff81015b903c28 0000000000000046 ffffffff8028cbb0 00000000fffffffb
 ffff81015b9d9270 ffff81015b8f0cd0 ffff81015b9d94c0 000000000271b490
 ffffe2000271b458 ffffe2000271b420 ffffe20002728dc8 ffffe20002728d90
Call Trace:
 [<ffffffff8028cbb0>] __set_page_dirty+0xeb/0xf5
 [<ffffffff8025403a>] get_dirty_limits+0x1d/0x22f
 [<ffffffff803c1d8a>] __mutex_lock_slowpath+0x64/0x9b
 [<ffffffff803c1bef>] mutex_lock+0xa/0xb
 [<ffffffffa0073f58>] :udf:udf_bitmap_free_blocks+0x47/0x1eb
 [<ffffffffa007df31>] :udf:udf_discard_prealloc+0xc6/0x172
 [<ffffffffa007875a>] :udf:udf_clear_inode+0x1e/0x48
 [<ffffffff8027f121>] clear_inode+0x6d/0xc4
 [<ffffffff8027f7f2>] dispose_list+0x56/0xee
 [<ffffffff8027fa5a>] shrink_icache_memory+0x1d0/0x200
 [<ffffffff80257742>] shrink_slab+0xe3/0x15b
 [<ffffffff80257e93>] kswapd+0x346/0x447
...

Reported-by: Tibor Tajti <tibor.tajti@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/udf/ialloc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index eb9cfa2..5bee415 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -135,12 +135,12 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
 			sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
 		iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 					    sizeof(struct extendedFileEntry),
-					    GFP_KERNEL);
+					    GFP_NOFS);
 	} else {
 		iinfo->i_efe = 0;
 		iinfo->i_ext.i_data = kzalloc(inode->i_sb->s_blocksize -
 					    sizeof(struct fileEntry),
-					    GFP_KERNEL);
+					    GFP_NOFS);
 	}
 	if (!iinfo->i_ext.i_data) {
 		iput(inode);
-- 
1.5.2.4

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