https://bugzilla.kernel.org/show_bug.cgi?id=206619
Bug ID: 206619
Summary: reboot hung since request_firmware
Product: ACPI
Version: 2.5
Kernel Version: 4.19
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Off
Assignee: [email protected]
Reporter: [email protected]
Regression: No
I got an issue in reboot pressure test,reboot command called by user first,all
userspace task has been killed,then a kworker thread grab cpu then invoking
request_firmware,but since uevent thread has been killed,request_firmware will
never load successfully,blocked in "wait_for_completion_killable_timeout"
,before wait complete,this thread has calling usermodehelper_read_trylock and
held "umhelper_sem" lock,at this time,init reboot continue to running,try to
__usermodehelper_disable,this needs hold umhelper_sem,but it's held by
kworker,casue reboot process blocked until request_firmware timeout and release
umhelper_sem,if timeout not be setting,this timeout maybe MAX_JIFFY_OFFSET,so i
think it's a risk.
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