I get below lockdep warning as of 1dc3217d on linux.git. I guess the situation
is same as of v3.14-rc6 because there is no changes in fs/xfs directory between
1dc3217d and v3.14-rc6. Also, the culprit commits were already backported to
RHEL7 beta somewhere between 3.10.0-90.el7 and 3.10.0-97.el7 .
[ 95.858636] audit: type=1404 audit(1394466090.590:2): selinux=0 auid=4294967295 ses=4294967295
[ 96.077814] ======================================================
[ 96.078356] [ INFO: possible circular locking dependency detected ]
[ 96.078748] 3.14.0-rc5+ #263 Not tainted
[ 96.079008] -------------------------------------------------------
[ 96.079182] systemd/1 is trying to acquire lock:
[ 96.079214] (&mm->mmap_sem){++++++}, at: [<ffffffff811bbd9f>] might_fault+0x5f/0xb0
[ 96.079520]
but task is already holding lock:
[ 96.079952] (&(&ip->i_lock)->mr_lock){++++..}, at: [<ffffffffa020a432>] xfs_ilock+0x122/0x250 [xfs]
[ 96.080061]
which lock already depends on the new lock.
[ 96.080574]
the existing dependency chain (in reverse order) is:
[ 96.080959]
-> #1 (&(&ip->i_lock)->mr_lock){++++..}:
[ 96.081263] [<ffffffff810de6a6>] __lock_acquire+0x3c6/0xb60
[ 96.081310] [<ffffffff810df632>] lock_acquire+0xa2/0x1d0
[ 96.081497] [<ffffffff810d80f7>] down_read_nested+0x57/0xa0
[ 96.081541] [<ffffffffa020a432>] xfs_ilock+0x122/0x250 [xfs]
[ 96.081761] [<ffffffffa020a590>] xfs_ilock_data_map_shared+0x30/0x40 [xfs]
[ 96.081838] [<ffffffffa01a3653>] __xfs_get_blocks+0xc3/0x7e0 [xfs]
[ 96.082010] [<ffffffffa01a3d81>] xfs_get_blocks+0x11/0x20 [xfs]
[ 96.082152] [<ffffffff81257817>] do_mpage_readpage+0x447/0x670
[ 96.082200] [<ffffffff81257b1b>] mpage_readpages+0xdb/0x130
[ 96.082466] [<ffffffffa01a1e3d>] xfs_vm_readpages+0x1d/0x20 [xfs]
[ 96.082608] [<ffffffff8119e672>] __do_page_cache_readahead+0x2c2/0x360
[ 96.082659] [<ffffffff8119ede1>] ra_submit+0x21/0x30
[ 96.082848] [<ffffffff81191fd5>] filemap_fault+0x395/0x440
[ 96.082971] [<ffffffff811bc3cf>] __do_fault+0x6f/0x530
[ 96.083091] [<ffffffff811c0642>] handle_mm_fault+0x492/0xee0
[ 96.083258] [<ffffffff816ab626>] __do_page_fault+0x196/0x5b0
[ 96.083310] [<ffffffff816aba71>] do_page_fault+0x31/0x70
[ 96.083350] [<ffffffff816a79f8>] page_fault+0x28/0x30
[ 96.083538] [<ffffffff81342def>] clear_user+0x2f/0x40
[ 96.083579] [<ffffffff81270db9>] padzero+0x29/0x40
[ 96.083767] [<ffffffff81271a16>] load_elf_binary+0x976/0xd80
[ 96.083890] [<ffffffff812173f4>] search_binary_handler+0x94/0x1b0
[ 96.084160] [<ffffffff81218a74>] do_execve_common.isra.26+0x654/0x8d0
[ 96.084288] [<ffffffff81218f69>] SyS_execve+0x29/0x30
[ 96.084548] [<ffffffff816b1959>] stub_execve+0x69/0xa0
[ 96.084669]
-> #0 (&mm->mmap_sem){++++++}:
[ 96.084863] [<ffffffff810dd7a1>] validate_chain.isra.43+0x1131/0x11d0
[ 96.086017] [<ffffffff810de6a6>] __lock_acquire+0x3c6/0xb60
[ 96.087062] [<ffffffff810df632>] lock_acquire+0xa2/0x1d0
[ 96.088117] [<ffffffff811bbdcc>] might_fault+0x8c/0xb0
[ 96.089183] [<ffffffff81225e11>] filldir+0x91/0x120
[ 96.090211] [<ffffffffa01aeee8>] xfs_dir2_block_getdents+0x1e8/0x250 [xfs]
[ 96.091289] [<ffffffffa01af0cd>] xfs_readdir+0x11d/0x210 [xfs]
[ 96.092331] [<ffffffffa01b166b>] xfs_file_readdir+0x2b/0x40 [xfs]
[ 96.093388] [<ffffffff81225c58>] iterate_dir+0xa8/0xe0
[ 96.094396] [<ffffffff81226103>] SyS_getdents+0x93/0x120
[ 96.095434] [<ffffffff816b1329>] system_call_fastpath+0x16/0x1b
[ 96.096443]
other info that might help us debug this:
[ 96.098894] Possible unsafe locking scenario:
[ 96.099795] CPU0 CPU1
[ 96.100234] ---- ----
[ 96.100666] lock(&(&ip->i_lock)->mr_lock);
[ 96.101158] lock(&mm->mmap_sem);
[ 96.101597] lock(&(&ip->i_lock)->mr_lock);
[ 96.102030] lock(&mm->mmap_sem);
[ 96.102458]
*** DEADLOCK ***
[ 96.103750] 2 locks held by systemd/1:
[ 96.104224] #0: (&type->i_mutex_dir_key#2){+.+.+.}, at: [<ffffffff81225c12>] iterate_dir+0x62/0xe0
[ 96.104669] #1: (&(&ip->i_lock)->mr_lock){++++..}, at: [<ffffffffa020a432>] xfs_ilock+0x122/0x250 [xfs]
[ 96.105135]
stack backtrace:
[ 96.106039] CPU: 1 PID: 1 Comm: systemd Not tainted 3.14.0-rc5+ #263
[ 96.106481] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/20/2012
[ 96.106946] ffffffff826a82a0 ffff880078427c08 ffffffff8169d6bd ffffffff826a82a0
[ 96.107424] ffff880078427c48 ffffffff81696ef2 ffff880078427c80 0000000000000001
[ 96.107906] ffff880078428cf8 0000000000000002 ffff880078428000 ffff880078428cf8
[ 96.108421] Call Trace:
[ 96.108964] [<ffffffff8169d6bd>] dump_stack+0x4d/0x66
[ 96.109459] [<ffffffff81696ef2>] print_circular_bug+0x1f9/0x207
[ 96.109949] [<ffffffff810dd7a1>] validate_chain.isra.43+0x1131/0x11d0
[ 96.110490] [<ffffffff810de6a6>] __lock_acquire+0x3c6/0xb60
[ 96.111040] [<ffffffffa01ad0bc>] ? xfs_buf_read_map+0x2c/0x270 [xfs]
[ 96.111556] [<ffffffff810df632>] lock_acquire+0xa2/0x1d0
[ 96.112097] [<ffffffff811bbd9f>] ? might_fault+0x5f/0xb0
[ 96.112610] [<ffffffff811bbdcc>] might_fault+0x8c/0xb0
[ 96.113119] [<ffffffff811bbd9f>] ? might_fault+0x5f/0xb0
[ 96.113660] [<ffffffff81225e11>] filldir+0x91/0x120
[ 96.114160] [<ffffffffa01aeee8>] xfs_dir2_block_getdents+0x1e8/0x250 [xfs]
[ 96.114668] [<ffffffffa01af0cd>] xfs_readdir+0x11d/0x210 [xfs]
[ 96.115166] [<ffffffffa01b166b>] xfs_file_readdir+0x2b/0x40 [xfs]
[ 96.115658] [<ffffffff81225c58>] iterate_dir+0xa8/0xe0
[ 96.116194] [<ffffffff81226103>] SyS_getdents+0x93/0x120
[ 96.116686] [<ffffffff81225d80>] ? fillonedir+0xf0/0xf0
[ 96.117198] [<ffffffff816b1329>] system_call_fastpath+0x16/0x1b
[ 99.855526] systemd-journald[426]: Vacuuming done, freed 0 bytes
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