Bug 13373 - fbcon, intelfb, i915: INFO: possible circular locking dependency detected
fbcon, intelfb, i915: INFO: possible circular locking dependency detected
Status: CLOSED CODE_FIX
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel)
All Linux
: P1 normal
Assigned To: drivers_video-dri
:
Depends on:
Blocks: 13070
  Show dependency treegraph
 
Reported: 2009-05-24 21:20 UTC by Rafael J. Wysocki
Modified: 2009-08-20 14:40 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.30-rc6-git6
Tree: Mainline
Regression: Yes


Attachments
My current .config file. (73.28 KB, text/plain)
2009-05-26 00:37 UTC, Miles Lane
Details

Description Rafael J. Wysocki 2009-05-24 21:20:07 UTC
Subject    : 2.5.30-rc6-git6 -- (fbcon, intelfb, i915?) INFO: possible circular locking dependency detected
Submitter  : Miles Lane <miles.lane@gmail.com>
Date       : 2009-05-23 5:08
References : http://marc.info/?l=linux-kernel&m=124305538130702&w=4

This entry is being used for tracking a regression from 2.6.29.  Please don't
close it until the problem is fixed in the mainline.
Comment 1 Miles Lane 2009-05-26 00:36:48 UTC
This bug is still present in 2.6.30-rc7.
I am testing this on an ASUS EEE-PC 1000HE.
Comment 2 Miles Lane 2009-05-26 00:37:49 UTC
Created attachment 21552 [details]
My current .config file.
Comment 3 Martin Bammer 2009-06-13 20:53:55 UTC
This bug is still present in 2.6.30:

[    5.056504] =======================================================
[    5.056660] [ INFO: possible circular locking dependency detected ]
[    5.056795] 2.6.30-ep1 #3
[    5.056849] -------------------------------------------------------
[    5.056962] udevadm/903 is trying to acquire lock:
[    5.057051]  (&mm->mmap_sem){++++++}, at: [<c018a093>] might_fault+0x35/0x72
[    5.057214] 
[    5.057216] but task is already holding lock:
[    5.057326]  (sysfs_mutex){+.+.+.}, at: [<c01e1f10>] sysfs_readdir+0xba/0x14b
[    5.057486] 
[    5.057488] which lock already depends on the new lock.
[    5.057491] 
[    5.057519] 
[    5.057519] the existing dependency chain (in reverse order) is:
[    5.057519] 
[    5.057519] -> #3 (sysfs_mutex){+.+.+.}:
[    5.057519]        [<c014bdc3>] __lock_acquire+0x95b/0xac2
[    5.057519]        [<c014bfda>] lock_acquire+0xb0/0xcd
[    5.057519]        [<c04c774c>] __mutex_lock_common+0x3e/0x392
[    5.057519]        [<c04c7ada>] mutex_lock_nested+0x12/0x15
[    5.057519]        [<c01e223a>] sysfs_addrm_start+0x23/0x90
[    5.057519]        [<c01e26d3>] create_dir+0x3a/0x68
[    5.057519]        [<c01e272e>] sysfs_create_dir+0x2d/0x41
[    5.057519]        [<c02ceb86>] kobject_add_internal+0xb7/0x158
[    5.057519]        [<c02cece0>] kobject_add_varg+0x35/0x41
[    5.057519]        [<c02ced51>] kobject_add+0x43/0x49
[    5.057519]        [<c037795c>] device_add+0xa8/0x46e
[    5.057519]        [<c0377d34>] device_register+0x12/0x15
[    5.057519]        [<c0377dac>] device_create_vargs+0x75/0x96
[    5.057519]        [<c0377de8>] device_create+0x1b/0x1d
[    5.057519]        [<c033b80a>] register_con_driver+0x8f/0xea
[    5.057519]        [<c033c857>] take_over_console+0x15/0x35
[    5.057519]        [<c02f8176>] fbcon_takeover+0x63/0x96
[    5.057519]        [<c02f881a>] fbcon_event_notify+0x341/0x6ba
[    5.057519]        [<c04cb0d6>] notifier_call_chain+0x2b/0x4a
[    5.057519]        [<c0141645>] __blocking_notifier_call_chain+0x37/0x4c
[    5.057519]        [<c0141666>] blocking_notifier_call_chain+0xc/0xe
[    5.057519]        [<c02ed715>] fb_notifier_call_chain+0x11/0x13
[    5.057519]        [<c02ee548>] register_framebuffer+0x1e9/0x20a
[    5.057519]        [<c0367be8>] intelfb_probe+0x49f/0x50b
[    5.057519]        [<c0353df3>] drm_helper_initial_config+0x145/0x14f
[    5.057519]        [<c0356e22>] i915_driver_load+0x8bd/0x909
[    5.057519]        [<c034ced9>] drm_get_dev+0x301/0x3cd
[    5.057519]        [<c04bb68c>] i915_pci_probe+0xd/0xf
[    5.057519]        [<c02dffe0>] local_pci_probe+0xe/0x10
[    5.057519]        [<c02e0a0d>] pci_device_probe+0x43/0x66
[    5.057519]        [<c03794b8>] driver_probe_device+0x79/0x105
[    5.057519]        [<c0379587>] __driver_attach+0x43/0x5f
[    5.057519]        [<c0378f2a>] bus_for_each_dev+0x3d/0x67
[    5.057519]        [<c037938f>] driver_attach+0x14/0x16
[    5.057519]        [<c03789a6>] bus_add_driver+0xa5/0x1cc
[    5.057519]        [<c03797cb>] driver_register+0x8b/0xe8
[    5.057519]        [<c02e0d8c>] __pci_register_driver+0x4c/0xa8
[    5.057519]        [<c0349667>] drm_init+0x59/0xb1
[    5.057519]        [<c070382e>] i915_init+0x46/0x48
[    5.057519]        [<c010113f>] do_one_initcall+0x4a/0x111
[    5.057519]        [<c06e32c6>] kernel_init+0x101/0x152
[    5.057519]        [<c01038c7>] kernel_thread_helper+0x7/0x10
[    5.057519]        [<ffffffff>] 0xffffffff
[    5.057519] 
[    5.057519] -> #2 ((fb_notifier_list).rwsem){.+.+.+}:
[    5.057519]        [<c014bdc3>] __lock_acquire+0x95b/0xac2
[    5.057519]        [<c014bfda>] lock_acquire+0xb0/0xcd
[    5.057519]        [<c04c7d81>] down_read+0x1e/0x5b
[    5.057519]        [<c0141632>] __blocking_notifier_call_chain+0x24/0x4c
[    5.057519]        [<c0141666>] blocking_notifier_call_chain+0xc/0xe
[    5.057519]        [<c02ed715>] fb_notifier_call_chain+0x11/0x13
[    5.057519]        [<c02ee548>] register_framebuffer+0x1e9/0x20a
[    5.057519]        [<c0367be8>] intelfb_probe+0x49f/0x50b
[    5.057519]        [<c0353df3>] drm_helper_initial_config+0x145/0x14f
[    5.057519]        [<c0356e22>] i915_driver_load+0x8bd/0x909
[    5.057519]        [<c034ced9>] drm_get_dev+0x301/0x3cd
[    5.057519]        [<c04bb68c>] i915_pci_probe+0xd/0xf
[    5.057519]        [<c02dffe0>] local_pci_probe+0xe/0x10
[    5.057519]        [<c02e0a0d>] pci_device_probe+0x43/0x66
[    5.057519]        [<c03794b8>] driver_probe_device+0x79/0x105
[    5.057519]        [<c0379587>] __driver_attach+0x43/0x5f
[    5.057519]        [<c0378f2a>] bus_for_each_dev+0x3d/0x67
[    5.057519]        [<c037938f>] driver_attach+0x14/0x16
[    5.057519]        [<c03789a6>] bus_add_driver+0xa5/0x1cc
[    5.057519]        [<c03797cb>] driver_register+0x8b/0xe8
[    5.057519]        [<c02e0d8c>] __pci_register_driver+0x4c/0xa8
[    5.057519]        [<c0349667>] drm_init+0x59/0xb1
[    5.057519]        [<c070382e>] i915_init+0x46/0x48
[    5.057519]        [<c010113f>] do_one_initcall+0x4a/0x111
[    5.057519]        [<c06e32c6>] kernel_init+0x101/0x152
[    5.057519]        [<c01038c7>] kernel_thread_helper+0x7/0x10
[    5.057519]        [<ffffffff>] 0xffffffff
[    5.057519] 
[    5.057519] -> #1 (&fb_info->lock){+.+.+.}:
[    5.057519]        [<c014bdc3>] __lock_acquire+0x95b/0xac2
[    5.057519]        [<c014bfda>] lock_acquire+0xb0/0xcd
[    5.057519]        [<c04c774c>] __mutex_lock_common+0x3e/0x392
[    5.057519]        [<c04c7ada>] mutex_lock_nested+0x12/0x15
[    5.057519]        [<c02edc98>] fb_mmap+0x87/0x156
[    5.057519]        [<c018fcc7>] mmap_region+0x23c/0x3f4
[    5.057519]        [<c01900be>] do_mmap_pgoff+0x23f/0x28f
[    5.057519]        [<c01060b3>] sys_mmap2+0x5a/0x7b
[    5.057519]        [<c0102da5>] syscall_call+0x7/0xb
[    5.057519]        [<ffffffff>] 0xffffffff
[    5.057519] 
[    5.057519] -> #0 (&mm->mmap_sem){++++++}:
[    5.057519]        [<c014bcd3>] __lock_acquire+0x86b/0xac2
[    5.057519]        [<c014bfda>] lock_acquire+0xb0/0xcd
[    5.057519]        [<c018a0b0>] might_fault+0x52/0x72
[    5.057519]        [<c02d3fdc>] copy_to_user+0x2c/0xfc
[    5.057519]        [<c01acf0b>] filldir64+0x97/0xcd
[    5.057519]        [<c01e1f6d>] sysfs_readdir+0x117/0x14b
[    5.057519]        [<c01ad11d>] vfs_readdir+0x68/0x94
[    5.057519]        [<c01ad1ab>] sys_getdents64+0x62/0xa1
[    5.057519]        [<c0102da5>] syscall_call+0x7/0xb
[    5.057519]        [<ffffffff>] 0xffffffff
[    5.057519] 
[    5.057519] other info that might help us debug this:
[    5.057519] 
[    5.057519] 2 locks held by udevadm/903:
[    5.057519]  #0:  (&type->i_mutex_dir_key){+.+.+.}, at: [<c01ad0fb>] vfs_readdir+0x46/0x94
[    5.057519]  #1:  (sysfs_mutex){+.+.+.}, at: [<c01e1f10>] sysfs_readdir+0xba/0x14b
[    5.057519] 
[    5.057519] stack backtrace:
[    5.057519] Pid: 903, comm: udevadm Not tainted 2.6.30-ep1 #3
[    5.057519] Call Trace:
[    5.057519]  [<c04c6580>] ? printk+0xf/0x11
[    5.057519]  [<c014b1a4>] print_circular_bug_tail+0x5d/0x68
[    5.057519]  [<c014bcd3>] __lock_acquire+0x86b/0xac2
[    5.057519]  [<c014bfda>] lock_acquire+0xb0/0xcd
[    5.057519]  [<c018a093>] ? might_fault+0x35/0x72
[    5.057519]  [<c018a0b0>] might_fault+0x52/0x72
[    5.057519]  [<c018a093>] ? might_fault+0x35/0x72
[    5.057519]  [<c02d3fdc>] copy_to_user+0x2c/0xfc
[    5.057519]  [<c01acf0b>] filldir64+0x97/0xcd
[    5.057519]  [<c01e1f6d>] sysfs_readdir+0x117/0x14b
[    5.057519]  [<c01ace74>] ? filldir64+0x0/0xcd
[    5.057519]  [<c01ad11d>] vfs_readdir+0x68/0x94
[    5.057519]  [<c01ace74>] ? filldir64+0x0/0xcd
[    5.057519]  [<c01ad1ab>] sys_getdents64+0x62/0xa1
[    5.057519]  [<c0102da5>] syscall_call+0x7/0xb
Comment 4 Miles Lane 2009-06-29 17:08:49 UTC
I just reproduced this in 2.6.31-rc1-git5.
Comment 5 Miles Lane 2009-08-19 23:42:59 UTC
I believe this is fixed.  I haven't seen this error in recent builds.
Comment 6 Rafael J. Wysocki 2009-08-20 14:40:26 UTC
OK, closing.

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