[Bug 195729] JBD2: Spotted dirty metadata buffer (dev = sda1, blocknr = 1766784).There's a risk of filesystem corruption in case of system crash.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=195729

--- Comment #1 from jqiaoulk@gmail.com ---
It tells us that clk_set_parent() will potentially goes to sleep under some
circumstances(in this case, to acquire the mutex lock).

Therefore,with regard to the Driver caller routine shown below, it must
incorrect runs in critical section, which possible call spin_lock() or other
related functions which disable the preemption. Since it is not in the IRQ
context, it is very likely spink lock is called in this failure case. Looking
into the Driver code, should give the clue.

[Fri May 05 05:26:09.992 2017] [40636.613352] [<7eea79ec>]
(vibe_os_clk_set_parent+0x34/0xb0 [vibe_os]) from [<7eec3cd0>]
(_ZN12CSTmClockLLA6EnableE29stm_clk_divider_output_name_t31stm_clk_divider_output_source_t31stm_clk_divider_output_divide_t+0xd4/0xf0
[stmcore_display_stiH407])
[Fri May 05 05:26:10.017 2017] [40636.635408] [<7eec3cd0>]
(_ZN12CSTmClockLLA6EnableE29stm_clk_divider_output_name_t31stm_clk_divider_output_source_t31stm_clk_divider_output_divide_t+0xd4/0xf0
[stmcore_display_stiH407]) from [<7eec8c2c>]
(_ZN16CSTmMainTVOutput15SetOutputFormatEj+0xc8/0x1b0 [stmcore_display_stiH407])
[Fri May 05 05:26:10.036 2017] [40636.660506] [<7eec8c2c>]
(_ZN16CSTmMainTVOutput15SetOutputFormatEj+0xc8/0x1b0 [stmcore_display_stiH407])
from [<7eebbd40>]
(_ZN16CSTmMasterOutput5StartEPK18stm_display_mode_s+0x1b8/0x1f8
[stmcore_display_stiH407])
[Fri May 05 05:26:10.069 2017] [40636.679522] [<7eebbd40>]
(_ZN16CSTmMasterOutput5StartEPK18stm_display_mode_s+0x1b8/0x1f8
[stmcore_display_stiH407]) from [<7eeba0ac>]
(stm_display_output_start+0x6c/0xb4 [stmcore_display_stiH407])
[Fri May 05 05:26:10.069 2017] [40636.697123] [<7eeba0ac>]
(stm_display_output_start+0x6c/0xb4 [stmcore_display_stiH407]) from
[<7f444650>] (dil_blender_output_start+0x8c/0x17c [stm_cdi_dvb])
[Fri May 05 05:26:10.079 2017] [40636.711321] [<7f444650>]
(dil_blender_output_start+0x8c/0x17c [stm_cdi_dvb]) from [<7f45717c>]
(cdi_hdmi_exit+0xb64/0xbc4 [stm_cdi_dvb])
[Fri May 05 05:26:10.092 2017] [40636.723660] [<7f45717c>]
(cdi_hdmi_exit+0xb64/0xbc4 [stm_cdi_dvb]) from [<7f4578a4>]
(dil_hdmi_set_video_code+0x4c/0x1d4 [stm_cdi_dvb])
[Fri May 05 05:26:10.104 2017] [40636.735912] [<7f4578a4>]
(dil_hdmi_set_video_code+0x4c/0x1d4 [stm_cdi_dvb]) from [<7f44ed74>]
(hdmi_release+0x316c/0x781c [stm_cdi_dvb])
[Fri May 05 05:26:10.151 2017] [40636.748251] [<7f44ed74>]
(hdmi_release+0x316c/0x781c [stm_cdi_dvb]) from [<7f4539a0>]
(hdmi_ioctl+0x57c/0x2d40 [stm_cdi_dvb])
[Fri May 05 05:26:10.152 2017] [40636.759631] [<7f4539a0>]
(hdmi_ioctl+0x57c/0x2d40 [stm_cdi_dvb]) from [<800fd4dc>] (vfs_ioctl+0x28/0x3c)
[Fri May 05 05:26:10.152 2017] [40636.769137] [<800fd4dc>]
(vfs_ioctl+0x28/0x3c) from [<800fdf48>] (do_vfs_ioctl+0x4b0/0x560)
[Fri May 05 05:26:10.152 2017] [40636.777484] [<800fdf48>]
(do_vfs_ioctl+0x4b0/0x560) from [<800fe02c>] (SyS_ioctl+0x34/0x60)
[Fri May 05 05:26:10.152 2017] [40636.785836] [<800fe02c>]
(SyS_ioctl+0x34/0x60) from [<8000dbc0>] (ret_fast_syscall+0x0/0x30)

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