https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220095
Bug ID: 220095
Summary: [scsi] sys/dev/dpt/dpt_scsi.c: a sleep-under-mutex bug
in dpt_init
Product: Base System
Version: 11.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The driver may sleep under a mutex, and the function call path in file
"sys/dev/dpt/dpt_scsi.c" in FreeBSD 11.0 is:
dpt_init [line 1246: acquire the mutex]
dptallocsgmap [line 1282]
bus_dmamap_load(BUS_DMA_WAITOK) [line 323] --> may sleep
The possible fix of this bug is to set the last parameter in bus_dmamap_load to
"BUS_DMA_NOWAIT".
This bug is found by a static analysis tool written by myself, and it is
checked by my review of the FreeBSD code.
Thanks,
Jia-Ju Bai
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