On Thu, Nov 13, 2014 at 9:25 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote: > On Thu, Nov 13, 2014 at 04:57:11PM -0800, Andy Lutomirski wrote: >> I'm running a kernel somewhere between 3.18-rc3 and 3.18-rc4. I got >> the warnings below. Is this a known issue? > > Yup, false positive. shmem is instantiating an inode under the > mmap_sem and in doing so taking inode locks under the mmap_sem, > which triggers other filesystems to issue false warnings about > mmap_sem <-> inode lock order. I still have an enormous flood of warnings even if CONFIG_PROVE_LOCKING=n. This one is repeated at high frequency: [ 70.969118] ------------[ cut here ]------------ [ 70.969121] WARNING: CPU: 8 PID: 653 at mm/truncate.c:758 pagecache_isize_extended+0x105/0x110() [ 70.969122] Modules linked in: x86_pkg_temp_thermal igb ioatdma mei_me dca ipmi_si ipmi_msghandler efivarfs radeon mgag200 drm_kms_helper ttm [ 70.969128] CPU: 8 PID: 653 Comm: systemd-journal Tainted: G W 3.18.0-rc3+ #9 [ 70.969129] Hardware name: Supermicro X9DRH-iF-NV/X9DRH-iF-NV, BIOS 2.0 08/06/2013 [ 70.969130] 0000000000000009 ffff88046611bd38 ffffffff819769bd 0000000000000000 [ 70.969132] 0000000000000000 ffff88046611bd78 ffffffff810cf621 ffff88086402da40 [ 70.969134] 0000000000001000 ffff88086402dc30 0000000003f5c000 0000000003f5d000 [ 70.969136] Call Trace: [ 70.969139] [<ffffffff819769bd>] dump_stack+0x46/0x58 [ 70.969141] [<ffffffff810cf621>] warn_slowpath_common+0x81/0xa0 [ 70.969144] [<ffffffff810cf6fa>] warn_slowpath_null+0x1a/0x20 [ 70.969145] [<ffffffff811cbec5>] pagecache_isize_extended+0x105/0x110 [ 70.969147] [<ffffffff811ccbc7>] truncate_setsize+0x27/0x40 [ 70.969150] [<ffffffff813762cf>] xfs_setattr_size+0x13f/0x3c0 [ 70.969152] [<ffffffff81383e76>] ? xfs_trans_commit+0x146/0x220 [ 70.969153] [<ffffffff8136b707>] xfs_file_fallocate+0x2e7/0x300 [ 70.969155] [<ffffffff8122f8c8>] ? __sb_start_write+0x58/0xf0 [ 70.969158] [<ffffffff8146a544>] ? selinux_file_permission+0xc4/0x120 [ 70.969160] [<ffffffff8122b31f>] do_fallocate+0x12f/0x1d0 [ 70.969163] [<ffffffff8122b408>] SyS_fallocate+0x48/0x80 [ 70.969165] [<ffffffff8197f1a9>] system_call_fastpath+0x12/0x17 [ 70.969166] ---[ end trace cb00af92b6f227a7 ]--- That's WARN_ON(!mutex_is_locked(&inode->i_mutex)); --Andy > > Cheers, > > Dave. > -- > Dave Chinner > david@xxxxxxxxxxxxx -- Andy Lutomirski AMA Capital Management, LLC _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
