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SubjectBUG: Dentry still in use (1) [unmount of cgroup cgroup]
Date
Hi, 
Observed a crash with cgroup tests from LTP(Stable April,2012 release)on Dell Inspiron 1526[Intel(R) Core2Duo T7250, MEM 4GB] and also on another x86 quad core target(4GB RAM).
LTP test case: cgroup_regression_test.sh(test 4,7 and 9 crashes randomly when the test cases are executed in order)
Shyju

[ 532.805905] BUG: Dentry ffff8801164db490{i=491b,n=/} still in use (1) [unmount of cgroup cgroup]
[ 532.805961] ------------[ cut here ]------------
[ 532.805996] kernel BUG at fs/dcache.c:965!
[ 532.806035] invalid opcode: 0000 [#1] SMP
[ 532.806067] CPU 1
[ 532.806505] Modules linked in: raw binfmt_misc ipv6 af_packet mperf fuse loop dm_mod coretemp kvm_intel kvm microcode tpm_tis tpm tpm_bios pcspkr serio_raw i2c_i801 i2c_core lpc_ich mfd_core hid_generic sg mptctl i5k_amb i5000_edac tg3 edac_core shpchp e1000e pci_hotplug button usbhid hid uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif edd ext3 mbcache jbd fan processor ide_pci_generic ide_core ata_generic ata_piix libata mptsas mptscsih mptbase scsi_transport_sas scsi_mod thermal thermal_sys hwmon
[ 532.806625]
[ 532.806650] Pid: 930, comm: kworker/1:2 Not tainted 3.5.0-rc3-0.7-default #2 HUAWEI TECHNOLOGIES CO.,LTD. Tecal/CN21WBSA
[ 532.806721] RIP: 0010:[<ffffffff811ec127>] [<ffffffff811ec127>] shrink_dcache_for_umount_subtree+0x267/0x290
[ 532.806765] RSP: 0018:ffff880111eafbf0 EFLAGS: 00010202
[ 532.806788] RAX: 0000000000000054 RBX: ffff8801164db490 RCX: 0000000000000006
[ 532.806811] RDX: ffffffff82a7d630 RSI: ffff88011318dfa8 RDI: 0000000000000246
[ 532.806832] RBP: ffff880111eafc10 R08: 0000000000000002 R09: 0000000000000000
[ 532.806855] R10: 000000000000000a R11: 0000000000000006 R12: ffff8801164db490
[ 532.806877] R13: ffffffff8181ca80 R14: ffff880116d43000 R15: ffff88011a9d5000
[ 532.806904] FS: 0000000000000000(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000
[ 532.806931] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 532.806951] CR2: 00007fcf7b4843e0 CR3: 0000000001c0c000 CR4: 00000000000007e0
[ 532.806984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 532.807011] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 532.807034] Process kworker/1:2 (pid: 930, threadinfo ffff880111eae000, task ffff88011318d680)
[ 532.807060] Stack:
[ 532.807084] ffff880116d43580 ffff8801164db4f0 ffff880116d43000 ffff880116d431b8
[ 532.807113] ffff880111eafc30 ffffffff811ec19a ffff880111eafc80 ffff880116d43000
[ 532.807143] ffff880111eafc60 ffffffff811cc3c7 ffff8801164db490 0000000000000013
[ 532.807164] Call Trace:
[ 532.807186] [<ffffffff811ec19a>] shrink_dcache_for_umount+0x4a/0x90
[ 532.807217] [<ffffffff811cc3c7>] generic_shutdown_super+0x37/0x160
[ 532.807247] [<ffffffff811cc5d9>] kill_anon_super+0x19/0x40
[ 532.807273] [<ffffffff811cc63a>] kill_litter_super+0x3a/0x50
[ 532.807300] [<ffffffff810fb65a>] cgroup_kill_sb+0x20a/0x280
[ 532.807330] [<ffffffff811ccdc5>] deactivate_locked_super+0x65/0xb0
[ 532.807353] [<ffffffff811ce339>] deactivate_super+0x89/0xe0
[ 532.807379] [<ffffffff810f7734>] cgroup_d_release+0x34/0x40
[ 532.807405] [<ffffffff811eb258>] d_free+0x58/0xc0
[ 532.807433] [<ffffffff811ee5f0>] dput+0x220/0x350
[ 532.807455] [<ffffffff810f7429>] css_dput_fn+0x19/0x30
[ 532.807483] [<ffffffff8107b4d9>] process_one_work+0x239/0x800
[ 532.807509] [<ffffffff8107b450>] ? process_one_work+0x1b0/0x800
[ 532.807527] [<ffffffff810f7410>] ? cgroup_rename+0x70/0x70
[ 532.807547] [<ffffffff8107eba3>] worker_thread+0x2e3/0x710
[ 532.807575] [<ffffffff8107e8c0>] ? manage_workers+0x370/0x370
[ 532.807595] [<ffffffff81087e46>] kthread+0xd6/0xf0
[ 532.807636] [<ffffffff81630474>] kernel_thread_helper+0x4/0x10
[ 532.807658] [<ffffffff816256f0>] ? retint_restore_args+0x13/0x13
[ 532.807672] [<ffffffff81087d70>] ? __init_kthread_worker+0x80/0x80
[ 532.807683] [<ffffffff81630470>] ? gs_change+0x13/0x13
[ 532.807811] Code: 83 05 6d a5 f1 01 01 48 8d 86 80 05 00 00 48 c7 c7 f0 68 9b 81 48 89 de 48 89 04 24 31 c0 e8 dd 30 43 00 48 83 05 59 a5 f1 01 01 <0f> 0b eb fe 48 83 05 45 a5 f1 01 01 31 d2 eb cc 48 83 05 11 a5
[ 532.807843] RIP [<ffffffff811ec127>] shrink_dcache_for_umount_subtree+0x267/0x290
[ 532.807856] RSP <ffff880111eafbf0>
[ 532.807876] ---[ end trace 1e5c705163c24a85 ]---
[ 532.808176] BUG: unable to handle kernel paging request at fffffffffffffff8
[ 532.808188] IP: [<ffffffff81087573>] kthread_data+0x13/0x20
[ 532.808198] PGD 1c0e067 PUD 1c0f067 PMD 0
[ 532.808206] Oops: 0000 [#2] SMP
[ 532.808212] CPU 1
[ 532.808326] Modules linked in: raw binfmt_misc ipv6 af_packet mperf fuse loop dm_mod coretemp kvm_intel kvm microcode tpm_tis tpm tpm_bios pcspkr serio_raw i2c_i801 i2c_core lpc_ich mfd_core hid_generic sg mptctl i5k_amb i5000_edac tg3 edac_core shpchp e1000e pci_hotplug button usbhid hid uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif edd ext3 mbcache jbd fan processor ide_pci_generic ide_core ata_generic ata_piix libata mptsas mptscsih mptbase scsi_transport_sas scsi_mod thermal thermal_sys hwmon
[ 532.808360]
[ 532.808368] Pid: 930, comm: kworker/1:2 Tainted: G D 3.5.0-rc3-0.7-default #2 HUAWEI TECHNOLOGIES CO.,LTD. Tecal/CN21WBSA
[ 532.808382] RIP: 0010:[<ffffffff81087573>] [<ffffffff81087573>] kthread_data+0x13/0x20
[ 532.808390] RSP: 0018:ffff880111eaf7e8 EFLAGS: 00010006
[ 532.808397] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88011318d6c8
[ 532.808404] RDX: ffff88011318d680 RSI: 0000000000000001 RDI: ffff88011318d680
[ 532.808412] RBP: ffff880111eaf7e8 R08: 0000000000000000 R09: 0000000000000001
[ 532.808422] R10: 0000000000000800 R11: 0000000000000000 R12: ffff88011318dc10
[ 532.808432] R13: 0000000000000001 R14: ffff88011a9d1b00 R15: 0000000000000000
[ 532.808442] FS: 0000000000000000(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000
[ 532.808455] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 532.808468] CR2: fffffffffffffff8 CR3: 0000000001c0c000 CR4: 00000000000007e0
[ 532.808487] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 532.808504] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 532.808516] Process kworker/1:2 (pid: 930, threadinfo ffff880111eae000, task ffff88011318d680)
[ 532.808531] Stack:
[ 532.808549] ffff880111eaf808 ffffffff8107d428 ffff880111eaf808 ffff880111eae010
[ 532.808570] ffff880111eaf948 ffffffff8162231d ffff880111eae010 00000000001d1b00
[ 532.808596] 00000000001d1b00 ffff88011318d680 00000000001d1b00 ffff880111eaffd8
[ 532.808608] Call Trace:
[ 532.808618] [<ffffffff8107d428>] wq_worker_sleeping+0x18/0x130
[ 532.808639] [<ffffffff8162231d>] __schedule+0x92d/0xe00
[ 532.808651] [<ffffffff810d976d>] ? trace_hardirqs_on+0x1d/0x30
[ 532.808667] [<ffffffff812f43c0>] ? put_io_context+0xc0/0x110
[ 532.808682] [<ffffffff812f453b>] ? put_io_context_active+0x12b/0x1a0
[ 532.808705] [<ffffffff81622984>] schedule+0x34/0xc0
[ 532.808717] [<ffffffff8105f306>] do_exit+0x9a6/0xe60
[ 532.808732] [<ffffffff81057c38>] ? kmsg_dump+0x98/0x1e0
[ 532.808759] [<ffffffff8162698c>] oops_end+0x15c/0x160
[ 532.808775] [<ffffffff81008889>] die+0x79/0xd0
[ 532.808794] [<ffffffff81625fe8>] do_trap+0x1b8/0x1f0
[ 532.808813] [<ffffffff81005988>] do_invalid_op+0xb8/0x100
[ 532.808830] [<ffffffff811ec127>] ? shrink_dcache_for_umount_subtree+0x267/0x290
[ 532.808844] [<ffffffff81058d0e>] ? vprintk_emit+0x23e/0x820
[ 532.808856] [<ffffffff81326c0d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 532.808872] [<ffffffff81625720>] ? restore_args+0x30/0x30
[ 532.808886] [<ffffffff816302eb>] invalid_op+0x1b/0x20
[ 532.808916] [<ffffffff811ec127>] ? shrink_dcache_for_umount_subtree+0x267/0x290
[ 532.808933] [<ffffffff811ec19a>] shrink_dcache_for_umount+0x4a/0x90
[ 532.808952] [<ffffffff811cc3c7>] generic_shutdown_super+0x37/0x160
[ 532.808972] [<ffffffff811cc5d9>] kill_anon_super+0x19/0x40
[ 532.808986] [<ffffffff811cc63a>] kill_litter_super+0x3a/0x50
[ 532.809011] [<ffffffff810fb65a>] cgroup_kill_sb+0x20a/0x280
[ 532.809026] [<ffffffff811ccdc5>] deactivate_locked_super+0x65/0xb0
[ 532.809040] [<ffffffff811ce339>] deactivate_super+0x89/0xe0
[ 532.809056] [<ffffffff810f7734>] cgroup_d_release+0x34/0x40
[ 532.809070] [<ffffffff811eb258>] d_free+0x58/0xc0
[ 532.809083] [<ffffffff811ee5f0>] dput+0x220/0x350
[ 532.809095] [<ffffffff810f7429>] css_dput_fn+0x19/0x30
[ 532.809112] [<ffffffff8107b4d9>] process_one_work+0x239/0x800
[ 532.809128] [<ffffffff8107b450>] ? process_one_work+0x1b0/0x800
[ 532.809142] [<ffffffff810f7410>] ? cgroup_rename+0x70/0x70
[ 532.809170] [<ffffffff8107eba3>] worker_thread+0x2e3/0x710
[ 532.809190] [<ffffffff8107e8c0>] ? manage_workers+0x370/0x370
[ 532.809207] [<ffffffff81087e46>] kthread+0xd6/0xf0
[ 532.809234] [<ffffffff81630474>] kernel_thread_helper+0x4/0x10
[ 532.809254] [<ffffffff816256f0>] ? retint_restore_args+0x13/0x13
[ 532.809279] [<ffffffff81087d70>] ? __init_kthread_worker+0x80/0x80
[ 532.809291] [<ffffffff81630470>] ? gs_change+0x13/0x13
[ 532.809352] Code: 00 48 89 e5 8b 40 f0 c9 c3 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 83 05 e0 46 71 01 01 55 48 8b 87 38 05 00 00 48 89 e5 <48> 8b 40 f8 c9 c3 0f 1f 80 00 00 00 00 55 48 3b 3d 78 46 71 01
[ 532.809369] RIP [<ffffffff81087573>] kthread_data+0x13/0x20
[ 532.809376] RSP <ffff880111eaf7e8>
[ 532.809381] CR2: fffffffffffffff8
[ 532.809390] ---[ end trace 1e5c705163c24a86 ]---
[ 532.809401] Fixing recursive fault but reboot is needed!
[ 592.820384] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=15002 jiffies)
[ 592.820402] INFO: Stall ended before state dump start
[ 609.100148] INFO: rcu_bh detected stalls on CPUs/tasks: { 1} (detected by 0, t=15002 jiffies)
[ 609.100168] INFO: Stall ended before state dump start
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