Date: Fri, 16 Jun 2017 08:09:08 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220033] [if_ixgb] sys/dev/ixgb/if_ixgb.c: a sleep-under-mutex bug in ixge_get_buf Message-ID: <bug-220033-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220033 Bug ID: 220033 Summary: [if_ixgb] sys/dev/ixgb/if_ixgb.c: a sleep-under-mutex bug in ixge_get_buf Product: Base System Version: 11.0-RELEASE Hardware: i386 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: baijiaju1990@163.com The ixgb driver may sleep under a mutex, and the function call path in file "sys/dev/ixgb/if_ixgb.c" in FreeBSD 11.0 is: ixgb_init [line 750: acquire the mutex] ixgb_init_locked [line 751] ixgb_setup_receive_structures [line 699] ixgb_allocate_receive_structures [line 1913] ixgb_get_buf [line 1885] bus_dmamap_load(BUS_DMA_WAITOK) [line 1812] --> may sleep The possible fix of these bugs is to set the last parameter in bus_dmamap_l= oad 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. By the way, I am a freshman in developing FreeBSD drivers, and I am willing= to submit a patch. But I do not know how to write and submit a patch, and wher= e to submit, so I am looking forward to useful advice :) Jia-Ju Bai --=20 You are receiving this mail because: You are the assignee for the bug.=
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