2013/5/14 Neil Zhang <glacier1980@xxxxxxxxx>: > 2013/5/14 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>: >> On Wed, May 01, 2013 at 09:56:13AM -0400, Robert Love wrote: >>> Don't acquire ashmem_mutex in ashmem_shrink if we've somehow recursed >>> into the >>> shrinker code from within ashmem. Just bail out, avoiding a deadlock. >>> This is >>> fine, as ashmem cache pruning is advisory anyhow. >>> >>> Signed-off-by: Robert Love <rlove@xxxxxxxxxx> >>> --- >>> drivers/staging/android/ashmem.c | 6 +++++- >>> 1 file changed, 5 insertions(+), 1 deletion(-) >> >> Based on Andrew's review comments, I'll drop this from my queue and wait >> for a "better" fix for this. >> >> thanks, >> >> greg k-h >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ > > We found the similar issue these days. > Add RaulXiong to paste the call stack. > > Best Regards, > Neil Zhang Hi all, I just encountered this deadlock during some stress test and it can be described clearly by below function stack. Please check and suggest a formal fix for it. [<c05d3370>] (__schedule) from [<c05d3818>] [<c05d3818>] (schedule_preempt_disabled) from [<c05d2578>] [<c05d2578>] (__mutex_lock_slowpath) from [<c05d263c>] [<c05d263c>] (mutex_lock) from [<c0441dd8>] [<c0441dd8>] (ashmem_shrink) from [<c01ae00c>] [<c01ae00c>] (shrink_slab) from [<c01b0ec8>] [<c01b0ec8>] (try_to_free_pages) from [<c01a65ec>] [<c01a65ec>] (__alloc_pages_nodemask) from [<c01d0414>] [<c01d0414>] (new_slab) from [<c05cf3a0>] [<c05cf3a0>] (__slab_alloc.isra.46.constprop.52) from [<c01d08cc>] [<c01d08cc>] (kmem_cache_alloc) from [<c01b1f6c>] [<c01b1f6c>] (shmem_alloc_inode) from [<c01e8d18>] [<c01e8d18>] (alloc_inode) from [<c01ea3c4>] [<c01ea3c4>] (new_inode_pseudo) from [<c01ea404>] [<c01ea404>] (new_inode) from [<c01b157c>] [<c01b157c>] (shmem_get_inode) from [<c01b3eac>] [<c01b3eac>] (shmem_file_setup) from [<c0441d1c>] [<c0441d1c>] (ashmem_mmap) from [<c01c1908>] [<c01c1908>] (mmap_region) from [<c01c1eac>] [<c01c1eac>] (sys_mmap_pgoff) from [<c0112d80>] Thanks, Raul Xiong -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
