J. R. Okajima:
Ok, thanks.
Guan, Nikolay, would you test this patch manually for mm/shmem.c?
It may produce a new warining once.
        ino = idr_alloc(&sbinfo->idr, inode, 2, INT_MAX,
GFP_NOFS);
        if (ino > 0) {
            inode->i_ino = ino;
            mutex_unlock(&sbinfo->idr_lock);
            __insert_inode_hash(inode,
inode->i_ino);
        } else {
+ Â Â Â Â Â Â Â Â Â Â Â WARN_ON_ONCE(inode->i_ino);
+ Â Â Â Â Â Â Â Â Â Â Â inode->i_ino = 0;
            mutex_unlock(&sbinfo->idr_lock);
            iput(inode);   /*
shmem_free_inode() will be called */
            inode = NULL;
        }
I tested it. I got the following in my dmesg output:
[Â Â 18.565143] WARNING: CPU: 2 PID: 1787 at lib/idr.c:527
idr_remove+0x22f/0x240()
[Â Â 18.565149] idr_remove called for id=32768 which is not allocated.
[Â Â 18.565153] Modules linked in:
[Â Â 18.565161] CPU: 2 PID: 1787 Comm: pcmanfm Not tainted 3.14.6-aufs #9
[Â Â 18.565166] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[Â Â 18.565172]Â 0000000000000000 0000000000000009 ffffffff8153d0a7
ffff880079a11da8
[Â Â 18.565179]Â ffffffff8104ba81 ffff880079a11e18 ffff88006c0c20c0
ffff88007f4090e8
[Â Â 18.565184]Â ffff88006c0c20c0 ffff88007f4090c0 ffffffff8104bb65
ffffffff8172cfd0
[Â Â 18.565190] Call Trace:
[Â Â 18.565204]Â [<ffffffff8153d0a7>] ? dump_stack+0x41/0x51
[Â Â 18.565215]Â [<ffffffff8104ba81>] ? warn_slowpath_common+0x81/0xb0
[Â Â 18.565224]Â [<ffffffff8104bb65>] ? warn_slowpath_fmt+0x45/0x50
[Â Â 18.565235]Â [<ffffffff811f488f>] ? idr_remove+0x22f/0x240
[Â Â 18.565262]Â [<ffffffff810e10fd>] ? shmem_evict_inode+0x9d/0x170
[Â Â 18.565273]Â [<ffffffff811270d2>] ? evict+0xa2/0x190
[Â Â 18.565283]Â [<ffffffff81123f98>] ? dentry_kill+0x208/0x250
[Â Â 18.565293]Â [<ffffffff8112438e>] ? dput+0x4e/0xf0
[Â Â 18.565327]Â [<ffffffff8110f9a9>] ? __fput+0x129/0x230
[Â Â 18.565338]Â [<ffffffff81064f6c>] ? task_work_run+0xac/0xd0
[Â Â 18.565348]Â [<ffffffff815437aa>] ? int_signal+0x12/0x17
[Â Â 18.565354] ---[ end trace 0c9e9c1ff0dffbfa ]---
[Â Â 18.891972] ------------[ cut here ]------------
[Â Â 18.892055] WARNING: CPU: 3 PID: 1785 at lib/idr.c:527
idr_remove+0x22f/0x240()
[Â Â 18.892184] idr_remove called for id=65536 which is not allocated.
[Â Â 18.892189] Modules linked in: it87(-) hwmon_vid
[Â Â 18.892224] CPU: 3 PID: 1785 Comm: lxpanel Tainted: GÂ Â Â Â Â Â Â
WÂ Â Â 3.14.6-aufs #9
[Â Â 18.892229] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[Â Â 18.892237]Â 0000000000000000 0000000000000009 ffffffff8153d0a7
ffff88007c4adda8
[Â Â 18.892241]Â ffffffff8104ba81 ffff88007c4ade18 ffff880079ba6ac0
ffff88007f4090e8
[Â Â 18.892245]Â ffff880079ba6ac0 ffff88007f4090c0 ffffffff8104bb65
ffffffff8172cfd0
[Â Â 18.892249] Call Trace:
[Â Â 18.892364]Â [<ffffffff8153d0a7>] ? dump_stack+0x41/0x51
[Â Â 18.892499]Â [<ffffffff8104ba81>] ? warn_slowpath_common+0x81/0xb0
[Â Â 18.892507]Â [<ffffffff8104bb65>] ? warn_slowpath_fmt+0x45/0x50
[Â Â 18.892514]Â [<ffffffff811f488f>] ? idr_remove+0x22f/0x240
[Â Â 18.892563]Â [<ffffffff810e10fd>] ? shmem_evict_inode+0x9d/0x170
[Â Â 18.892591]Â [<ffffffff811270d2>] ? evict+0xa2/0x190
[Â Â 18.892599]Â [<ffffffff81123f98>] ? dentry_kill+0x208/0x250
[Â Â 18.892606]Â [<ffffffff8112438e>] ? dput+0x4e/0xf0
[Â Â 18.892620]Â [<ffffffff8110f9a9>] ? __fput+0x129/0x230
[Â Â 18.892632]Â [<ffffffff81064f6c>] ? task_work_run+0xac/0xd0
[Â Â 18.892664]Â [<ffffffff815437aa>] ? int_signal+0x12/0x17
[Â Â 18.892668] ---[ end trace 0c9e9c1ff0dffbfb ]---
[Â Â 18.894319] ------------[ cut here ]------------
[Â Â 18.894334] WARNING: CPU: 3 PID: 1785 at lib/idr.c:527
idr_remove+0x22f/0x240()
[Â Â 18.894338] idr_remove called for id=98304 which is not allocated.
[Â Â 18.894341] Modules linked in: it87(-) hwmon_vid
[Â Â 18.894346] CPU: 3 PID: 1785 Comm: lxpanel Tainted: GÂ Â Â Â Â Â Â
WÂ Â Â 3.14.6-aufs #9
[Â Â 18.894350] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[Â Â 18.894353]Â 0000000000000000 0000000000000009 ffffffff8153d0a7
ffff88007c4adda8
[Â Â 18.894358]Â ffffffff8104ba81 ffff88007c4ade18 ffff880079ba6d40
ffff88007f4090e8
[Â Â 18.894362]Â ffff880079ba6d40 ffff88007f4090c0 ffffffff8104bb65
ffffffff8172cfd0
[Â Â 18.894366] Call Trace:
[Â Â 18.894374]Â [<ffffffff8153d0a7>] ? dump_stack+0x41/0x51
[Â Â 18.894381]Â [<ffffffff8104ba81>] ? warn_slowpath_common+0x81/0xb0
[Â Â 18.894390]Â [<ffffffff8104bb65>] ? warn_slowpath_fmt+0x45/0x50
[Â Â 18.894397]Â [<ffffffff811f488f>] ? idr_remove+0x22f/0x240
[Â Â 18.894404]Â [<ffffffff810e10fd>] ? shmem_evict_inode+0x9d/0x170
[Â Â 18.894411]Â [<ffffffff811270d2>] ? evict+0xa2/0x190
[Â Â 18.894418]Â [<ffffffff81123f98>] ? dentry_kill+0x208/0x250
[Â Â 18.894425]Â [<ffffffff8112438e>] ? dput+0x4e/0xf0
[Â Â 18.894432]Â [<ffffffff8110f9a9>] ? __fput+0x129/0x230
[Â Â 18.894439]Â [<ffffffff81064f6c>] ? task_work_run+0xac/0xd0
[Â Â 18.894448]Â [<ffffffff815437aa>] ? int_signal+0x12/0x17
[Â Â 18.894453] ---[ end trace 0c9e9c1ff0dffbfc ]---
--
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