Revision e34a314c5e49fe6b763568f6576b19f1299c33c2 authored by Dave Chinner on 27 January 2011, 01:13:35 UTC, committed by Alex Elder on 28 January 2011, 15:01:33 UTC
After test 139, kmemleak shows: unreferenced object 0xffff880078b405d8 (size 400): comm "xfs_io", pid 4904, jiffies 4294909383 (age 1186.728s) hex dump (first 32 bytes): 60 c1 17 79 00 88 ff ff 60 c1 17 79 00 88 ff ff `..y....`..y.... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff81afb04d>] kmemleak_alloc+0x2d/0x60 [<ffffffff8115c6cf>] kmem_cache_alloc+0x13f/0x2b0 [<ffffffff814aaa97>] kmem_zone_alloc+0x77/0xf0 [<ffffffff814aab2e>] kmem_zone_zalloc+0x1e/0x50 [<ffffffff8147cd6b>] xfs_efi_init+0x4b/0xb0 [<ffffffff814a4ee8>] xfs_trans_get_efi+0x58/0x90 [<ffffffff81455fab>] xfs_bmap_finish+0x8b/0x1d0 [<ffffffff814851b4>] xfs_itruncate_finish+0x2c4/0x5d0 [<ffffffff814a970f>] xfs_setattr+0x8df/0xa70 [<ffffffff814b5c7b>] xfs_vn_setattr+0x1b/0x20 [<ffffffff8117dc00>] notify_change+0x170/0x2e0 [<ffffffff81163bf6>] do_truncate+0x66/0xa0 [<ffffffff81163d0b>] sys_ftruncate+0xdb/0xe0 [<ffffffff8103a002>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff The cause of the leak is that the "remove" parameter of IOP_UNPIN() is never set when a CIL push is aborted. This means that the EFI item is never freed if it was in the push being cancelled. The problem is specific to delayed logging, but has uncovered a couple of problems with the handling of IOP_UNPIN(remove). Firstly, we cannot safely call xfs_trans_del_item() from IOP_UNPIN() in the CIL commit failure path or the iclog write failure path because for delayed loging we have no transaction context. Hence we must only call xfs_trans_del_item() if the log item being unpinned has an active log item descriptor. Secondly, xfs_trans_uncommit() does not handle log item descriptor freeing during the traversal of log items on a transaction. It can reference a freed log item descriptor when unpinning an EFI item. Hence it needs to use a safe list traversal method to allow items to be removed from the transaction during IOP_UNPIN(). Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Alex Elder <aelder@sgi.com>
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File | Mode | Size |
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ChangeLog | -rw-r--r-- | 14.0 KB |
Kconfig | -rw-r--r-- | 948 bytes |
Makefile | -rw-r--r-- | 164 bytes |
TODO | -rw-r--r-- | 385 bytes |
befs.h | -rw-r--r-- | 3.2 KB |
befs_fs_types.h | -rw-r--r-- | 4.9 KB |
btree.c | -rw-r--r-- | 21.9 KB |
btree.h | -rw-r--r-- | 300 bytes |
datastream.c | -rw-r--r-- | 15.5 KB |
datastream.h | -rw-r--r-- | 514 bytes |
debug.c | -rw-r--r-- | 7.6 KB |
endian.h | -rw-r--r-- | 3.1 KB |
inode.c | -rw-r--r-- | 1.1 KB |
inode.h | -rw-r--r-- | 123 bytes |
io.c | -rw-r--r-- | 1.8 KB |
io.h | -rw-r--r-- | 190 bytes |
linuxvfs.c | -rw-r--r-- | 24.1 KB |
super.c | -rw-r--r-- | 3.0 KB |
super.h | -rw-r--r-- | 134 bytes |
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