[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 #2 from jqiaoulk@gmail.com ---
So briefly speaking, one following call must incorrect call spin_lock or other
functions that disable the preemption in this failure case:

For example:

Failure case:

stm_display_output_start()
spin_lock()
_ZN16CSTmMasterOutput5StartEPK18stm_display_mode_s  -------> We can't sleep
here since it is in the critical section !!!
spin_unlock()
Call Sequence:

(1) vibe_os_clk_set_parent

(2)
_ZN12CSTmClockLLA6EnableE29stm_clk_divider_output_name_t31stm_clk_divider_output_source_t31stm_clk_divider_output_divide_t

(3) _ZN16CSTmMainTVOutput15SetOutputFormatEj

(4) _ZN16CSTmMasterOutput5StartEPK18stm_display_mode_s

(5) stm_display_output_start()

(6) dil_blender_output_start

(7) cdi_hdmi_exit

(8) dil_hdmi_set_video_code

(9) hdmi_release

(10) hdmi_ioctl()

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