Hi,
I've upgraded my machine to 3.16.o-rc6+ with lockdep enabled and now
I get the following bttv related lockdep warning:
[ 4.797234] media: Linux media interface: v0.10
[ 4.810984] snd_bt87x 0000:04:07.1: bt87x0: Using board 1, analog, digital (rate 32000 Hz)
[ 4.836178] Linux video capture interface: v2.00
[ 4.997442] bttv: driver version 0.9.19 loaded
[ 4.997446] bttv: using 8 buffers with 2080k (520 pages) each for capture
[ 5.001339] bttv: Bt8xx card found (0)
[ 5.001482] bttv: 0: Bt878 (rev 2) at 0000:04:07.0, irq: 20, latency: 32, mmio: 0xd0001000
[ 5.001499] bttv: 0: detected: Hauppauge WinTV [card=10], PCI subsystem ID is 0070:13eb
[ 5.001501] bttv: 0: using: Hauppauge (bt878) [card=10,autodetected]
[ 5.004174] bttv: 0: Hauppauge/Voodoo msp34xx: reset line init [5]
[ 5.039038] tveeprom 9-0050: Hauppauge model 61334, rev B2 , serial# 3211125
[ 5.039040] tveeprom 9-0050: tuner model is Philips FM1216 (idx 21, type 5)
[ 5.039042] tveeprom 9-0050: TV standards PAL(B/G) (eeprom 0x04)
[ 5.039043] tveeprom 9-0050: audio processor is MSP3415 (idx 6)
[ 5.039044] tveeprom 9-0050: has radio
[ 5.039045] bttv: 0: Hauppauge eeprom indicates model#61334
[ 5.039046] bttv: 0: tuner type=5
[ 5.073212] msp3400 9-0040: MSP3410D-B4 found @ 0x80 (bt878 #0 [sw])
[ 5.073217] msp3400 9-0040: msp3400 supports nicam, mode is autodetect
[ 5.114390] tuner 9-0061: Tuner -1 found with type(s) Radio TV.
[ 5.144779] tuner-simple 9-0061: creating new instance
[ 5.144782] tuner-simple 9-0061: type set to 5 (Philips PAL_BG (FI1216 and compatibles))
[ 5.148047] ======================================================
[ 5.148048] [ INFO: possible circular locking dependency detected ]
[ 5.148050] 3.16.0-rc6+ #109 Tainted: G OE
[ 5.148051] -------------------------------------------------------
[ 5.148052] systemd-udevd/545 is trying to acquire lock:
[ 5.148053] (msp3400_driver:799:(hdl)->_lock){+.+.+.}, at: [<ffffffffa0282295>] find_ref_lock+0x25/0x60 [videodev]
[ 5.148062]
but task is already holding lock:
[ 5.148063] (bttv_driver:4066:(hdl)->_lock){+.+...}, at: [<ffffffffa028323d>] v4l2_ctrl_handler_setup+0x3d/0x130 [videodev]
[ 5.148069]
which lock already depends on the new lock.
[ 5.148070]
the existing dependency chain (in reverse order) is:
[ 5.148071]
-> #1 (bttv_driver:4066:(hdl)->_lock){+.+...}:
[ 5.148074] [<ffffffff81102054>] lock_acquire+0xa4/0x1d0
[ 5.148077] [<ffffffff8180b425>] mutex_lock_nested+0x85/0x440
[ 5.148080] [<ffffffffa0282295>] find_ref_lock+0x25/0x60 [videodev]
[ 5.148083] [<ffffffffa0284b36>] handler_new_ref+0x46/0x1d0 [videodev]
[ 5.148087] [<ffffffffa02857af>] v4l2_ctrl_add_handler+0x9f/0xe0 [videodev]
[ 5.148091] [<ffffffffa027ebf6>] v4l2_device_register_subdev+0xe6/0x1e0 [videodev]
[ 5.148094] [<ffffffffa029f743>] v4l2_i2c_new_subdev_board+0x93/0x110 [v4l2_common]
[ 5.148097] [<ffffffffa029f82a>] v4l2_i2c_new_subdev+0x6a/0x90 [v4l2_common]
[ 5.148099] [<ffffffffa032a8c6>] bttv_init_card2+0x1486/0x1990 [bttv]
[ 5.148106] [<ffffffffa032781d>] bttv_probe+0x78d/0xd20 [bttv]
[ 5.148110] [<ffffffff8142e515>] local_pci_probe+0x45/0xa0
[ 5.148113] [<ffffffff8142f959>] pci_device_probe+0xf9/0x150
[ 5.148115] [<ffffffff8151e003>] driver_probe_device+0xa3/0x400
[ 5.148119] [<ffffffff8151e42b>] __driver_attach+0x8b/0x90
[ 5.148121] [<ffffffff8151bc83>] bus_for_each_dev+0x73/0xc0
[ 5.148123] [<ffffffff8151da5e>] driver_attach+0x1e/0x20
[ 5.148125] [<ffffffff8151d628>] bus_add_driver+0x188/0x260
[ 5.148128] [<ffffffff8151ef04>] driver_register+0x64/0xf0
[ 5.148130] [<ffffffff8142ddc0>] __pci_register_driver+0x60/0x70
[ 5.148132] [<ffffffffa03470cf>] bttv_init_module+0xcf/0xe9 [bttv]
[ 5.148136] [<ffffffff81002148>] do_one_initcall+0xd8/0x210
[ 5.148139] [<ffffffff8113a600>] load_module+0x2110/0x2740
[ 5.148142] [<ffffffff8113ae16>] SyS_finit_module+0xa6/0xe0
[ 5.148143] [<ffffffff81810069>] system_call_fastpath+0x16/0x1b
[ 5.148146]
-> #0 (msp3400_driver:799:(hdl)->_lock){+.+.+.}:
[ 5.148148] [<ffffffff8110158b>] __lock_acquire+0x1abb/0x1ca0
[ 5.148150] [<ffffffff81102054>] lock_acquire+0xa4/0x1d0
[ 5.148152] [<ffffffff8180b425>] mutex_lock_nested+0x85/0x440
[ 5.148153] [<ffffffffa0282295>] find_ref_lock+0x25/0x60 [videodev]
[ 5.148157] [<ffffffffa02822de>] v4l2_ctrl_find+0xe/0x30 [videodev]
[ 5.148161] [<ffffffffa032649d>] audio_mute+0x3d/0xb0 [bttv]
[ 5.148165] [<ffffffffa03266a6>] bttv_s_ctrl+0x196/0x440 [bttv]
[ 5.148168] [<ffffffffa02832ee>] v4l2_ctrl_handler_setup+0xee/0x130 [videodev]
[ 5.148172] [<ffffffffa0327874>] bttv_probe+0x7e4/0xd20 [bttv]
[ 5.148176] [<ffffffff8142e515>] local_pci_probe+0x45/0xa0
[ 5.148178] [<ffffffff8142f959>] pci_device_probe+0xf9/0x150
[ 5.148180] [<ffffffff8151e003>] driver_probe_device+0xa3/0x400
[ 5.148182] [<ffffffff8151e42b>] __driver_attach+0x8b/0x90
[ 5.148184] [<ffffffff8151bc83>] bus_for_each_dev+0x73/0xc0
[ 5.148186] [<ffffffff8151da5e>] driver_attach+0x1e/0x20
[ 5.148188] [<ffffffff8151d628>] bus_add_driver+0x188/0x260
[ 5.148190] [<ffffffff8151ef04>] driver_register+0x64/0xf0
[ 5.148192] [<ffffffff8142ddc0>] __pci_register_driver+0x60/0x70
[ 5.148194] [<ffffffffa03470cf>] bttv_init_module+0xcf/0xe9 [bttv]
[ 5.148198] [<ffffffff81002148>] do_one_initcall+0xd8/0x210
[ 5.148200] [<ffffffff8113a600>] load_module+0x2110/0x2740
[ 5.148201] [<ffffffff8113ae16>] SyS_finit_module+0xa6/0xe0
[ 5.148203] [<ffffffff81810069>] system_call_fastpath+0x16/0x1b
[ 5.148205]
other info that might help us debug this:
[ 5.148206] Possible unsafe locking scenario:
[ 5.148207] CPU0 CPU1
[ 5.148208] ---- ----
[ 5.148209] lock(bttv_driver:4066:(hdl)->_lock);
[ 5.148211] lock(msp3400_driver:799:(hdl)->_lock);
[ 5.148213] lock(bttv_driver:4066:(hdl)->_lock);
[ 5.148214] lock(msp3400_driver:799:(hdl)->_lock);
[ 5.148216]
*** DEADLOCK ***
[ 5.148218] 3 locks held by systemd-udevd/545:
[ 5.148218] #0: (&dev->mutex){......}, at: [<ffffffff8151e3e3>] __driver_attach+0x43/0x90
[ 5.148222] #1: (&dev->mutex){......}, at: [<ffffffff8151e3f1>] __driver_attach+0x51/0x90
[ 5.148226] #2: (bttv_driver:4066:(hdl)->_lock){+.+...}, at: [<ffffffffa028323d>] v4l2_ctrl_handler_setup+0x3d/0x130 [videodev]
[ 5.148231]
stack backtrace:
[ 5.148233] CPU: 3 PID: 545 Comm: systemd-udevd Tainted: G OE 3.16.0-rc6+ #109
[ 5.148235] Hardware name: FUJITSU D3071-S1/D3071-S1, BIOS V4.6.4.0 R1.12.0.SR.4 for D3071-S1x 05/03/2013
[ 5.148236] 0000000000000000 0000000032f7aef8 ffff880230c57800 ffffffff818064c7
[ 5.148238] ffffffff82ba8b00 ffff880230c57840 ffffffff818037fc ffff880230c578a0
[ 5.148241] ffff88003513b448 ffff88003513b3a0 0000000000000003 ffff88003513bfb0
[ 5.148243] Call Trace:
[ 5.148246] [<ffffffff818064c7>] dump_stack+0x4d/0x66
[ 5.148249] [<ffffffff818037fc>] print_circular_bug+0x201/0x20f
[ 5.148251] [<ffffffff8110158b>] __lock_acquire+0x1abb/0x1ca0
[ 5.148253] [<ffffffff810ff67d>] ? trace_hardirqs_on_caller+0x15d/0x200
[ 5.148255] [<ffffffff8180f2ac>] ? _raw_spin_unlock_irq+0x2c/0x40
[ 5.148258] [<ffffffff810d3b4d>] ? finish_task_switch+0x3d/0x120
[ 5.148260] [<ffffffff81102054>] lock_acquire+0xa4/0x1d0
[ 5.148263] [<ffffffffa0282295>] ? find_ref_lock+0x25/0x60 [videodev]
[ 5.148265] [<ffffffff8180b425>] mutex_lock_nested+0x85/0x440
[ 5.148269] [<ffffffffa0282295>] ? find_ref_lock+0x25/0x60 [videodev]
[ 5.148272] [<ffffffffa0282295>] ? find_ref_lock+0x25/0x60 [videodev]
[ 5.148274] [<ffffffff810ff72d>] ? trace_hardirqs_on+0xd/0x10
[ 5.148277] [<ffffffffa0282295>] find_ref_lock+0x25/0x60 [videodev]
[ 5.148281] [<ffffffffa02822de>] v4l2_ctrl_find+0xe/0x30 [videodev]
[ 5.148284] [<ffffffffa032649d>] audio_mute+0x3d/0xb0 [bttv]
[ 5.148288] [<ffffffffa03266a6>] bttv_s_ctrl+0x196/0x440 [bttv]
[ 5.148292] [<ffffffffa02832ee>] v4l2_ctrl_handler_setup+0xee/0x130 [videodev]
[ 5.148296] [<ffffffffa0327874>] bttv_probe+0x7e4/0xd20 [bttv]
[ 5.148298] [<ffffffff8142e515>] local_pci_probe+0x45/0xa0
[ 5.148300] [<ffffffff8142f7f5>] ? pci_match_device+0xe5/0x110
[ 5.148302] [<ffffffff8142f959>] pci_device_probe+0xf9/0x150
[ 5.148305] [<ffffffff8151e003>] driver_probe_device+0xa3/0x400
[ 5.148307] [<ffffffff8151e42b>] __driver_attach+0x8b/0x90
[ 5.148310] [<ffffffff8151e3a0>] ? __device_attach+0x40/0x40
[ 5.148312] [<ffffffff8151bc83>] bus_for_each_dev+0x73/0xc0
[ 5.148314] [<ffffffff8151da5e>] driver_attach+0x1e/0x20
[ 5.148316] [<ffffffff8151d628>] bus_add_driver+0x188/0x260
[ 5.148319] [<ffffffffa0347000>] ? 0xffffffffa0346fff
[ 5.148322] [<ffffffff8151ef04>] driver_register+0x64/0xf0
[ 5.148324] [<ffffffff8142ddc0>] __pci_register_driver+0x60/0x70
[ 5.148328] [<ffffffffa03470cf>] bttv_init_module+0xcf/0xe9 [bttv]
[ 5.148330] [<ffffffff81002148>] do_one_initcall+0xd8/0x210
[ 5.148332] [<ffffffff812067ca>] ? __vunmap+0xba/0x120
[ 5.148334] [<ffffffff8113a600>] load_module+0x2110/0x2740
[ 5.148337] [<ffffffff81135870>] ? store_uevent+0x70/0x70
[ 5.148340] [<ffffffff812515d7>] ? kernel_read+0x57/0x90
[ 5.148342] [<ffffffff8113ae16>] SyS_finit_module+0xa6/0xe0
[ 5.148344] [<ffffffff81810069>] system_call_fastpath+0x16/0x1b
[ 5.154573] bttv: 0: Setting PLL: 28636363 => 35468950 (needs up to 100ms)
[ 5.176880] bttv: PLL set ok
[ 5.178240] bttv: 0: registered device video0
[ 5.178984] bttv: 0: registered device vbi0
[ 5.179106] bttv: 0: registered device radio0
Regards,
Hans
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
