Date: Fri, 16 Jun 2017 08:19:27 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220035] [ufs] sys/ufs/ufs/ufs_vnops.c: a sleep-under-mutex bug in acl_alloc Message-ID: <bug-220035-8@https.bugs.freebsd.org/bugzilla/>
next in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220035 Bug ID: 220035 Summary: [ufs] sys/ufs/ufs/ufs_vnops.c: a sleep-under-mutex bug in acl_alloc Product: Base System Version: 11.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: baijiaju1990@163.com The ufs program may sleep under a mutex, and the code path in file "sys/ufs/ufs/ufs_vnops.c" in FreeBSD 11.0 is: ufs_accessx [line 363: acquire the mutex] ufs_accessx [line 369] ufs_accessx [line 372] ufs_accessx [line 374] ufs_accessx [line 376] ufs_accessx [line 379] ufs_accessx [line 383] ufs_accessx [line 389] ufs_accessx [line 394] ufs_accessx [line 395] ufs_accessx [line 398] acl_alloc(M_WAITOK) [line 400] --> may sleep The possible fix of these bugs is to set the parameter in acl_alloc to "M_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.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-220035-8>