From: Zan Lynx <zlynx@acm.org>
To: Linux Kernel <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: 2.6.20-rc6-mm3 possible circular lock on mmap_sem
Date: Thu, 01 Feb 2007 17:43:35 -0700 [thread overview]
Message-ID: <1170377015.7233.11.camel@localhost> (raw)
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I just noticed this in my logs, from the lock checker:
[ 142.299455]
[ 142.299458] =======================================================
[ 142.299473] [ INFO: possible circular locking dependency detected ]
[ 142.299478] 2.6.20-rc6-mm3 #2
[ 142.299482] -------------------------------------------------------
[ 142.299547] evolution-data-/6909 is trying to acquire lock:
[ 142.299551] (&mm->mmap_sem){----}, at: [<ffffffff80266096>] do_page_fault+0x3f6/0x8a0
[ 142.299742]
[ 142.299743] but task is already holding lock:
[ 142.299749] (&data->latch){----}, at: [<ffffffff8034f221>] get_exclusive_access+0x11/0x20
[ 142.299880]
[ 142.299880] which lock already depends on the new lock.
[ 142.299882]
[ 142.299947]
[ 142.299948] the existing dependency chain (in reverse order) is:
[ 142.300010]
[ 142.300011] -> #1 (&data->latch){----}:
[ 142.300138] [<ffffffff8029e968>] __lock_acquire+0xd48/0xff0
[ 142.300390] [<ffffffff8029ec5b>] lock_acquire+0x4b/0x70
[ 142.300583] [<ffffffff8034f221>] get_exclusive_access+0x11/0x20
[ 142.300833] [<ffffffff80298db4>] down_write+0x34/0x40
[ 142.301084] [<ffffffff8034f221>] get_exclusive_access+0x11/0x20
[ 142.301277] [<ffffffff8034e58e>] mmap_unix_file+0x8e/0x1a0
[ 142.301526] [<ffffffff8020d80b>] do_mmap_pgoff+0x4eb/0x820
[ 142.301777] [<ffffffff8029d496>] mark_held_locks+0x76/0xa0
[ 142.301969] [<ffffffff80263bf4>] _spin_unlock_irq+0x24/0x30
[ 142.302219] [<ffffffff80263bf4>] _spin_unlock_irq+0x24/0x30
[ 142.302468] [<ffffffff80233e73>] elf_map+0xa3/0x100
[ 142.302662] [<ffffffff80217990>] load_elf_binary+0x920/0x1cd0
[ 142.302912] [<ffffffff8020ab35>] kfree+0xd5/0xf0
[ 142.303162] [<ffffffff80282860>] load_aout_binary+0x0/0x990
[ 142.303356] [<ffffffff80217070>] load_elf_binary+0x0/0x1cd0
[ 142.303606] [<ffffffff8023f68d>] search_binary_handler+0x9d/0x240
[ 142.303857] [<ffffffff8024cef1>] load_script+0x211/0x240
[ 142.304050] [<ffffffff80217070>] load_elf_binary+0x0/0x1cd0
[ 142.304300] [<ffffffff8024cce0>] load_script+0x0/0x240
[ 142.304549] [<ffffffff8024cce0>] load_script+0x0/0x240
[ 142.304741] [<ffffffff8023f68d>] search_binary_handler+0x9d/0x240
[ 142.304991] [<ffffffff8023ea8a>] do_execve+0x17a/0x220
[ 142.305241] [<ffffffff80292920>] __call_usermodehelper+0x0/0x80
[ 142.305434] [<ffffffff80252734>] sys_execve+0x44/0xb0
[ 142.305684] [<ffffffff8025cb44>] kernel_execve+0x64/0xd0
[ 142.305878] [<ffffffff80292920>] __call_usermodehelper+0x0/0x80
[ 142.306127] [<ffffffff80292d21>] ____call_usermodehelper+0x161/0x170
[ 142.306377] [<ffffffff8025cad8>] child_rip+0xa/0x12
[ 142.306569] [<ffffffff80263bf4>] _spin_unlock_irq+0x24/0x30
[ 142.306818] [<ffffffff8025c6bc>] restore_args+0x0/0x30
[ 142.307068] [<ffffffff80292bc0>] ____call_usermodehelper+0x0/0x170
[ 142.307260] [<ffffffff8025cace>] child_rip+0x0/0x12
[ 142.307510] [<ffffffffffffffff>] 0xffffffffffffffff
[ 142.307752]
[ 142.307752] -> #0 (&mm->mmap_sem){----}:
[ 142.307878] [<ffffffff8029cadb>] print_circular_bug_header+0xdb/0x100
[ 142.308128] [<ffffffff8029e827>] __lock_acquire+0xc07/0xff0
[ 142.308378] [<ffffffff8029d496>] mark_held_locks+0x76/0xa0
[ 142.308570] [<ffffffff8029ec5b>] lock_acquire+0x4b/0x70
[ 142.308820] [<ffffffff80266096>] do_page_fault+0x3f6/0x8a0
[ 142.309013] [<ffffffff80298cd7>] down_read+0x37/0x40
[ 142.309263] [<ffffffff80266096>] do_page_fault+0x3f6/0x8a0
[ 142.309513] [<ffffffff8029d496>] mark_held_locks+0x76/0xa0
[ 142.309705] [<ffffffff8026412d>] error_exit+0x0/0x96
[ 142.309954] [<ffffffff8020c883>] file_read_actor+0x43/0x180
[ 142.310147] [<ffffffff8026170f>] __wait_on_bit_lock+0x6f/0x80
[ 142.310399] [<ffffffff8020b94b>] do_generic_mapping_read+0x25b/0x580
[ 142.310649] [<ffffffff8020c840>] file_read_actor+0x0/0x180
[ 142.310841] [<ffffffff80215eca>] generic_file_aio_read+0x19a/0x1f0
[ 142.311091] [<ffffffff8020c50b>] do_sync_read+0xdb/0x130
[ 142.311340] [<ffffffff80296540>] wake_bit_function+0x0/0x30
[ 142.311533] [<ffffffff80263897>] _spin_unlock+0x17/0x20
[ 142.311783] [<ffffffff8033257e>] reiser4_grab+0xae/0xd0
[ 142.311977] [<ffffffff8034d28b>] read_unix_file+0xdb/0x450
[ 142.312227] [<ffffffff8021604b>] vma_merge+0x12b/0x1e0
[ 142.312476] [<ffffffff8020ac0a>] vfs_read+0xba/0x180
[ 142.312669] [<ffffffff80210753>] sys_read+0x53/0x90
[ 142.312918] [<ffffffff8025c11e>] system_call+0x7e/0x83
[ 142.313111] [<ffffffffffffffff>] 0xffffffffffffffff
[ 142.313361]
[ 142.313361] other info that might help us debug this:
[ 142.313363]
[ 142.313428] 1 lock held by evolution-data-/6909:
[ 142.313432] #0: (&data->latch){----}, at: [<ffffffff8034f221>] get_exclusive_access+0x11/0x20
[ 142.313619]
[ 142.313619] stack backtrace:
[ 142.313682]
[ 142.313682] Call Trace:
[ 142.313690] [<ffffffff8029c714>] print_circular_bug_tail+0x74/0x90
[ 142.313754] [<ffffffff8029cadb>] print_circular_bug_header+0xdb/0x100
[ 142.313760] [<ffffffff8029e827>] __lock_acquire+0xc07/0xff0
[ 142.313766] [<ffffffff8029d496>] mark_held_locks+0x76/0xa0
[ 142.313830] [<ffffffff8029ec5b>] lock_acquire+0x4b/0x70
[ 142.313835] [<ffffffff80266096>] do_page_fault+0x3f6/0x8a0
[ 142.313898] [<ffffffff80298cd7>] down_read+0x37/0x40
[ 142.313904] [<ffffffff80266096>] do_page_fault+0x3f6/0x8a0
[ 142.313913] [<ffffffff8029d496>] mark_held_locks+0x76/0xa0
[ 142.313977] [<ffffffff8026412d>] error_exit+0x0/0x96
[ 142.313985] [<ffffffff8020c883>] file_read_actor+0x43/0x180
[ 142.313991] [<ffffffff8026170f>] __wait_on_bit_lock+0x6f/0x80
[ 142.314055] [<ffffffff8020b94b>] do_generic_mapping_read+0x25b/0x580
[ 142.314060] [<ffffffff8020c840>] file_read_actor+0x0/0x180
[ 142.314071] [<ffffffff80215eca>] generic_file_aio_read+0x19a/0x1f0
[ 142.314135] [<ffffffff8020c50b>] do_sync_read+0xdb/0x130
[ 142.314143] [<ffffffff80296540>] wake_bit_function+0x0/0x30
[ 142.314150] [<ffffffff80263897>] _spin_unlock+0x17/0x20
[ 142.314213] [<ffffffff8033257e>] reiser4_grab+0xae/0xd0
[ 142.314219] [<ffffffff8034d28b>] read_unix_file+0xdb/0x450
[ 142.314225] [<ffffffff8021604b>] vma_merge+0x12b/0x1e0
[ 142.314291] [<ffffffff8020ac0a>] vfs_read+0xba/0x180
[ 142.314297] [<ffffffff80210753>] sys_read+0x53/0x90
[ 142.314360] [<ffffffff8025c11e>] system_call+0x7e/0x83
[ 142.314366]
--
Zan Lynx <zlynx@acm.org>
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