Hello
Lockdep is nagging about lock inconsistenty on 2.6.32. I am
testing a swap driver under memory pressure. The test application
just allocates 120% of available free memory and writes to random
pages. Rootfs is JFS on a VirtualBox machine.
Jarkko Lavinen
=================================
[ INFO: inconsistent lock state ]
2.6.32 #23
---------------------------------
inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
sh/1956 [HC0[0]:SC0[0]:HE1:SE1] takes:
(&jfs_ip->rdwrlock#2){++++?.}, at: [<c1150dad>] jfs_get_block+0x3c/0x239
{RECLAIM_FS-ON-W} state was registered at:
[<c105408f>] mark_held_locks+0x43/0x5b
[<c1054123>] lockdep_trace_alloc+0x7c/0x91
[<c10b3fd4>] kmem_cache_alloc+0x24/0x12a
[<c11b01e8>] radix_tree_preload+0x27/0x63
[<c108f628>] add_to_page_cache_locked+0x1b/0xa7
[<c108f6da>] add_to_page_cache_lru+0x26/0x58
[<c108f7f3>] read_cache_page_async+0x5c/0xf5
[<c108f898>] read_cache_page+0xc/0x3f
[<c11656e6>] __get_metapage+0xbc/0x1f2
[<c115967d>] diWrite+0x116/0x47e
[<c116862a>] txCommit+0x1cc/0xd09
[<c1150cf7>] jfs_truncate_nolock+0xbf/0xf1
[<c1150d62>] jfs_truncate+0x39/0x48
[<c1096937>] vmtruncate+0x49/0x54
[<c10ca376>] inode_setattr+0x51/0x122
[<c10ca5fb>] notify_change+0x1b4/0x2a6
[<c10b8bf2>] do_truncate+0x6b/0x84
[<c10c2467>] may_open+0x195/0x19b
[<c10c29fa>] do_filp_open+0x3c7/0x758
[<c10b7fd9>] do_sys_open+0x4a/0xe2
[<c10b80b3>] sys_open+0x1e/0x26
[<c1002b15>] syscall_call+0x7/0xb
irq event stamp: 9783
hardirqs last enabled at (9783): [<c14ac00b>]
_write_unlock_irqrestore+0x36/0x3c
hardirqs last disabled at (9782): [<c14ac343>] _write_lock_irqsave+0xf/0x34
softirqs last enabled at (9594): [<c1036860>] __do_softirq+0x158/0x160
softirqs last disabled at (9581): [<c1036893>] do_softirq+0x2b/0x43
other info that might help us debug this:
1 lock held by sh/1956:
#0: (&mm->mmap_sem){++++++}, at: [<c14adf19>] do_page_fault+0x175/0x30f
stack backtrace:
Pid: 1956, comm: sh Not tainted 2.6.32 #23
Call Trace:
[<c14aa167>] ? printk+0xf/0x11
[<c1053e4f>] valid_state+0x130/0x143
[<c1053f53>] mark_lock+0xf1/0x1ea
[<c1054814>] ? check_usage_forwards+0x0/0x68
[<c10550fb>] __lock_acquire+0x368/0xbe1
[<c10559fd>] lock_acquire+0x89/0xa0
[<c1150dad>] ? jfs_get_block+0x3c/0x239
[<c1049179>] down_write_nested+0x34/0x52
[<c1150dad>] ? jfs_get_block+0x3c/0x239
[<c1150dad>] jfs_get_block+0x3c/0x239
[<c10d706a>] __block_write_full_page+0x136/0x2cc
[<c1150d71>] ? jfs_get_block+0x0/0x239
[<c10d7298>] block_write_full_page_endio+0x98/0xa3
[<c10d6028>] ? end_buffer_async_write+0x0/0x129
[<c1150d71>] ? jfs_get_block+0x0/0x239
[<c10d72b0>] block_write_full_page+0xd/0xf
[<c10d6028>] ? end_buffer_async_write+0x0/0x129
[<c1150b4a>] jfs_writepage+0xf/0x11
[<c1097972>] shrink_page_list+0x387/0x641
[<c1097f73>] shrink_list+0x347/0x576
[<c10983ad>] shrink_zone+0x20b/0x2aa
[<c14aa272>] ? io_schedule_timeout+0x8a/0xad
[<c1045f13>] ? autoremove_wake_function+0x0/0x33
[<c1098f5a>] try_to_free_pages+0x1e4/0x2f9
[<c1096a8c>] ? isolate_pages_global+0x0/0x193
[<c1093f41>] __alloc_pages_nodemask+0x2fa/0x4cf
[<c10a34ff>] handle_mm_fault+0x1ea/0x717
[<c1049254>] ? down_read_trylock+0x39/0x43
[<c14ae09d>] do_page_fault+0x2f9/0x30f
[<c14adda4>] ? do_page_fault+0x0/0x30f
[<c14ac59b>] error_code+0x6b/0x70
[<c14adda4>] ? do_page_fault+0x0/0x30f
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