On Mon, Jul 02, 2012 at 11:39:14AM +0800, Fengguang Wu wrote:
> On Mon, Jul 02, 2012 at 10:56:25AM +0800, Fengguang Wu wrote:
> > Hi all,
> >
> > More observations on this bug:
> >
> > The slab tree itself actually boots fine. So Christoph's commit may be
> > merely disclosing some bug hidden in another for-next tree which
> > happens to be merged before the slab tree..
>
> Sorry: the bug does appear in the standalone slab tree, where the
> dmesg is
>
> [ 307.648802] blkid (2963) used greatest stack depth: 2832 bytes left
> [ 307.892070] vhci_hcd: changed 0
> [ 308.766647]
> [ 308.766648] =========================
> [ 308.766649] [ BUG: held lock freed! ]
> [ 308.766651] 3.5.0-rc1+ #44 Not tainted
> [ 308.766651] -------------------------
> [ 308.766653] mtd_probe/3040 is freeing memory ffff880006defdd0-ffff880006df0dcf, with a lock still held there!
> [ 308.766662] (&type->s_umount_key#31/1){+.+.+.}, at: [<ffffffff81187166>] sget+0x299/0x463
> [ 308.766663] 3 locks held by mtd_probe/3040:
> [ 308.766667] #0: (&type->s_umount_key#31/1){+.+.+.}, at: [<ffffffff81187166>] sget+0x299/0x463
> [ 308.766671] #1: (sb_lock){+.+.-.}, at: [<ffffffff81186f00>] sget+0x33/0x463
> [ 308.766675] #2: (unnamed_dev_lock){+.+...}, at: [<ffffffff81186711>] get_anon_bdev+0x38/0xe8
> [ 308.766675]
> [ 308.766675] stack backtrace:
> [ 308.766677] Pid: 3040, comm: mtd_probe Not tainted 3.5.0-rc1+ #44
> [ 308.766678] Call Trace:
> [ 308.766683] [<ffffffff810ddc6e>] debug_check_no_locks_freed+0x109/0x14b
> [ 308.766703] [<ffffffff81173f7c>] kmem_cache_free+0x2e/0xa7
> [ 308.766708] [<ffffffff816a5d9d>] ida_get_new_above+0x173/0x184
> [ 308.766711] [<ffffffff810db9a4>] ? lock_acquired+0x1e4/0x219
> [ 308.766713] [<ffffffff81186727>] get_anon_bdev+0x4e/0xe8
> [ 308.766715] [<ffffffff811867d8>] set_anon_super+0x17/0x2a
> [ 308.766717] [<ffffffff81187270>] sget+0x3a3/0x463
> [ 308.766719] [<ffffffff811867c1>] ? get_anon_bdev+0xe8/0xe8
> [ 308.766722] [<ffffffff811a1fbe>] mount_pseudo+0x31/0x152
> [ 308.766727] [<ffffffff81cb1f54>] mtd_inodefs_mount+0x24/0x26
> [ 308.766729] [<ffffffff81187e34>] mount_fs+0x69/0x155
> [ 308.766733] [<ffffffff811531b2>] ? __alloc_percpu+0x10/0x12
> [ 308.766736] [<ffffffff8119ca4c>] vfs_kern_mount+0x62/0xd9
> [ 308.766739] [<ffffffff811a1b43>] simple_pin_fs+0x4c/0x9b
> [ 308.766741] [<ffffffff81cb338a>] mtdchar_open+0x42/0x188
> [ 308.766744] [<ffffffff811886ef>] chrdev_open+0x11f/0x14a
> [ 308.766747] [<ffffffff810c0880>] ? local_clock+0x19/0x52
> [ 308.766750] [<ffffffff811885d0>] ? cdev_put+0x26/0x26
> [ 308.766752] [<ffffffff811836cc>] do_dentry_open+0x1e4/0x2b2
> [ 308.766754] [<ffffffff8118434a>] nameidata_to_filp+0x5e/0xa3
> [ 308.766756] [<ffffffff8119118f>] do_last+0x68f/0x6d3
> [ 308.766759] [<ffffffff811912d8>] path_openat+0xd2/0x32a
> [ 308.766762] [<ffffffff8111eed8>] ? time_hardirqs_off+0x26/0x2a
> [ 308.766765] [<ffffffff810d9e88>] ? trace_hardirqs_off+0xd/0xf
> [ 308.766767] [<ffffffff81191630>] do_filp_open+0x38/0x86
> [ 308.766771] [<ffffffff82e95e22>] ? _raw_spin_unlock+0x28/0x3b
> [ 308.766773] [<ffffffff8119baa7>] ? alloc_fd+0xe5/0xf7
> [ 308.766776] [<ffffffff811843fd>] do_sys_open+0x6e/0xfb
> [ 308.766777] [<ffffffff811844ab>] sys_open+0x21/0x23
> [ 308.766780] [<ffffffff82e9cb69>] system_call_fastpath+0x16/0x1b
Another dmesg on the slab tree:
[ 54.522438] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 54.567847] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 54.591289]
[ 54.591290] =========================
[ 54.591291] [ BUG: held lock freed! ]
[ 54.591293] 3.5.0-rc1+ #45 Not tainted
[ 54.591293] -------------------------
[ 54.591295] swapper/0/1 is freeing memory ffff88000f45fdd0-ffff88000f460dcf, with a lock still held there!
[ 54.591304] (&port->mutex){+.+.+.}, at: [<ffffffff817df6d2>] uart_add_one_port+0x84/0x356
[ 54.591306] 3 locks held by swapper/0/1:
[ 54.591310] #0: (port_mutex){+.+.+.}, at: [<ffffffff817df6c0>] uart_add_one_port+0x72/0x356
[ 54.591314] #1: (&port->mutex){+.+.+.}, at: [<ffffffff817df6d2>] uart_add_one_port+0x84/0x356
[ 54.591319] #2: (sysfs_ino_lock){+.+...}, at: [<ffffffff811e273f>] sysfs_new_dirent+0x6b/0x10c
[ 54.591320]
[ 54.591320] stack backtrace:
[ 54.591322] Pid: 1, comm: swapper/0 Not tainted 3.5.0-rc1+ #45
[ 54.591323] Call Trace:
[ 54.591338] [<ffffffff810ddc6e>] debug_check_no_locks_freed+0x109/0x14b
[ 54.591342] [<ffffffff81173fa0>] kmem_cache_free+0x2e/0xa7
[ 54.591346] [<ffffffff816a5d9d>] ida_get_new_above+0x173/0x184
[ 54.591351] [<ffffffff810db9a4>] ? lock_acquired+0x1e4/0x219
[ 54.591354] [<ffffffff811e2754>] sysfs_new_dirent+0x80/0x10c
[ 54.591357] [<ffffffff811e1cad>] sysfs_add_file_mode+0x4e/0xce
[ 54.591366] [<ffffffff811e1d3f>] sysfs_add_file+0x12/0x14
[ 54.591368] [<ffffffff811e4296>] sysfs_merge_group+0x45/0x97
[ 54.591372] [<ffffffff819bff1b>] dpm_sysfs_add+0x54/0xab
[ 54.591374] [<ffffffff819b9394>] device_add+0x3ba/0x5d7
[ 54.591377] [<ffffffff819b95cc>] device_register+0x1b/0x1f
[ 54.591379] [<ffffffff819b9661>] device_create_vargs+0x91/0xc8
[ 54.591381] [<ffffffff819b96c9>] device_create+0x31/0x33
[ 54.591385] [<ffffffff817c1792>] tty_register_device+0xde/0xfb
[ 54.591388] [<ffffffff817df90f>] uart_add_one_port+0x2c1/0x356
[ 54.591406] [<ffffffff84641c95>] serial8250_init+0x12b/0x189
[ 54.591409] [<ffffffff84641095>] ? r3964_init+0x25/0x41
[ 54.591411] [<ffffffff84641b6a>] ? serial8250_console_init+0x2c/0x2c
[ 54.591414] [<ffffffff81002099>] do_one_initcall+0x7f/0x13a
[ 54.591419] [<ffffffff84603d39>] kernel_init+0x170/0x1f8
[ 54.591422] [<ffffffff84603590>] ? do_early_param+0x8c/0x8c
[ 54.591435] [<ffffffff82e9dfb4>] kernel_thread_helper+0x4/0x10
[ 54.591438] [<ffffffff82e961f0>] ? retint_restore_args+0x13/0x13
[ 54.591441] [<ffffffff84603bc9>] ? start_kernel+0x3e7/0x3e7
[ 54.591443] [<ffffffff82e9dfb0>] ? gs_change+0x13/0x13
[ 54.625113] 00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Thanks,
Fengguang
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