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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-09-10 17:14:42 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-09-11 05:39:37 +0400 |
| commit | 69e044dd759e26667c110ab771d2c908fbd5d3dd (patch) | |
| tree | bdd11f7c23fc8472e025f133b283c7cc322ada32 /arch/um | |
| parent | 256588fda10f2a712631f8a4e72641a66adebdb8 (diff) | |
| download | linux-69e044dd759e26667c110ab771d2c908fbd5d3dd.tar.xz | |
powerpc: Fix possible deadlock on page fault
stack_grow_into/14082 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<c000000000206d28>] .might_fault+0x78/0xe0
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: [<c0000000007ffd8c>] .do_page_fault+0x24c/0x910
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&mm->mmap_sem);
lock(&mm->mmap_sem);
*** DEADLOCK ***
May be due to missing lock nesting notation
1 lock held by stack_grow_into/14082:
#0: (&mm->mmap_sem){++++++}, at: [<c0000000007ffd8c>] .do_page_fault+0x24c/0x910
stack backtrace:
CPU: 21 PID: 14082 Comm: stack_grow_into Not tainted 3.10.0-10.el7.ppc64.debug #1
Call Trace:
[c0000003d396b850] [c000000000016e7c] .show_stack+0x7c/0x1f0 (unreliable)
[c0000003d396b920] [c000000000813fc8] .dump_stack+0x28/0x3c
[c0000003d396b990] [c000000000124b90] .__lock_acquire+0x1640/0x1800
[c0000003d396bab0] [c00000000012570c] .lock_acquire+0xac/0x250
[c0000003d396bb80] [c000000000206d54] .might_fault+0xa4/0xe0
[c0000003d396bbf0] [c0000000007ffe2c] .do_page_fault+0x2ec/0x910
[c0000003d396be30] [c0000000000092e8] handle_page_fault+0x10/0x30
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/um')
0 files changed, 0 insertions, 0 deletions