pkg/report: add "lock held when returning to user space" format for o…

…lder kernels

pkg/report/linux.go

@@ -693,6 +693,12 @@ var linuxOopses = []*oops{
 				report: compile("BUG: .*still has locks held!(?:.*\\n)+?.*{{PC}} +{{FUNC}}"),
 				fmt:    "BUG: still has locks held in %[1]v",
 			},
+			{
+				title:        compile("BUG: lock held when returning to user space"),
+				report:       compile("BUG: lock held when returning to user space(?:.*\\n)+?.*leaving the kernel with locks still held(?:.*\\n)+?.*at: (?:{{PC}} +)?{{FUNC}}"),
+				fmt:          "BUG: lock held when returning to user space in %[1]v",
+				noStackTrace: true,
+			},
 			{
 				title:  compile("BUG: bad unlock balance detected!"),
 				report: compile("BUG: bad unlock balance detected!(?:.*\\n){0,15}?.*is trying to release lock(?:.*\\n){0,15}?.*{{PC}} +{{FUNC}}"),
@@ -819,7 +825,6 @@ var linuxOopses = []*oops{
 				fmt:   "WARNING: locking bug in %[1]v",
 				stack: warningStackFmt(),
 			},
-
 			{
 				title:        compile("WARNING: lock held when returning to user space"),
 				report:       compile("WARNING: lock held when returning to user space(?:.*\\n)+?.*leaving the kernel with locks still held(?:.*\\n)+?.*at: (?:{{PC}} +)?{{FUNC}}"),

pkg/report/testdata/linux/report/258

@@ -0,0 +1,10 @@
+TITLE: BUG: lock held when returning to user space in fuse_lock_inode
+
+[   36.715112] ================================================
+[   36.720935] [ BUG: lock held when returning to user space! ]
+[   36.726730] 4.9.112-g9e79039 #7 Not tainted
+[   36.731032] ------------------------------------------------
+[   36.736813] syz-executor724/3814 is leaving the kernel with locks still held!
+[   36.744085] 1 lock held by syz-executor724/3814:
+[   36.748826]  #0:  (&fi->mutex){+.+.+.}, at: [<ffffffff81938722>] fuse_lock_inode+0xa2/0xd0
+[   36.748826]  #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff81938722>] somethingelse+0xa2/0xd0